Climatological Report (Monthly)
Issued by NWS Denver/Boulder, CO

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CXUS55 KBOU 011309
CLMDEN

DENCLMDEN 000
TTAA00 KBOU 010900


CLIMATE REPORT
NATIONAL WEATHER SERVICE BOULDER, CO
200 AM MST WED JAN 1 2014

...................................

...THE DENVER CO CLIMATE SUMMARY FOR THE YEAR OF 2013...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2013

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             105   06/26/2012
                        06/25/2012
                        07/20/2005
 LOW              -29   01/09/1875
HIGHEST           100   07/11        64      36      105  06/26
                        06/11                             06/25
LOWEST            -15   12/05        36     -51       -6  01/11
AVG. MAXIMUM     63.9              64.7    -0.8     68.4
AVG. MINIMUM     36.3              36.3     0.0     39.3
MEAN             50.1              50.5    -0.4     53.9
DAYS MAX >= 90     54              39.6    14.4       73
DAYS MAX <= 32     29              20.0     9.0       19
DAYS MIN <= 32    169             156.9    12.1      132
DAYS MIN <= 0      11               5.8     5.2        4

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        23.31   1196
 MINIMUM         7.29   2008
TOTALS          17.60             14.30    3.30    10.11
DAILY AVG.       0.05              0.04    0.01     0.03
DAYS >= .01        82              79.7     2.3       52
DAYS >= .10        42              34.9     7.1       23
DAYS >= .50         8               7.6     0.4        9
DAYS >= 1.00        3               2.3     0.7        1
GREATEST
 24 HR. TOTAL    2.39   MM                       12/31 TO 12/31
                                                          12/31 TO 12/31
                                                          12/31 TO 12/31
 STORM TOTAL       MM                                 MM
 (MM/DD(HH))            MM                    12/31(00) TO 12/31(00)
                                                 12/31(00) TO 12/31(00)1
                                                 12/31(00) TO 12/31(00)1

SNOWFALL (INCHES)
RECORDS
 TOTAL             MM   5
 24 HR TOTAL       MM
 SNOW DEPTH        MM   MM
TOTALS           74.1              53.8    20.3     38.5
 LIQUID EQUIV    7.41              5.40    2.01     3.85
SINCE 7/1         8.1              22.5   -14.4     12.4
 LIQUID 7/1      0.81              2.20   -1.39     1.24
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= TRACE      60              33.3    26.7       36
DAYS >= 1.0        20              16.3     3.7       13
GREATEST
 SNOW DEPTH         9   02/25                         11  02/04
 24 HR TOTAL      9.1   MM                       12/31 TO 12/31
                                                          12/31 TO 12/31
                                                          12/31 TO 12/31
 STORM TOTAL       MM                                 MM
 (MM/DD(HH))            MM                    12/31(00) TO 12/31(00)
                                                 12/31(00) TO 12/31(00)1
                                                 12/31(00) TO 12/31(00)1

DEGREE_DAYS
HEATING TOTAL    6302              6059     243     5198
 SINCE 7/1         MM              2468      MM       MM
COOLING TOTAL     999                 0     999     1236
 SINCE 1/1        999               769     230     1236

FREEZE DATES
RECORD
 EARLIEST     09/08/1962
 LATEST       06/08/2007
EARLIEST                        10/07
LATEST                          05/05
..................................................

WIND (MPH)
AVERAGE WIND SPEED              9.7
RESULTANT WIND SPEED/DIRECTION   2/201
HIGHEST WIND SPEED/DIRECTION    64/060    DATE  06/18
HIGHEST GUST SPEED/DIRECTION    97/040    DATE  06/18

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR           69
NUMBER OF DAYS PC            232
NUMBER OF DAYS CLOUDY         64

AVERAGE RH (PERCENT)     52

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN               14     RAIN                      25
LIGHT RAIN               80     FREEZING RAIN              0
LT FREEZING RAIN          4     HAIL                       0
HEAVY SNOW               11     SNOW                      23
LIGHT SNOW               58     SLEET                      0
FOG                     105     FOG W/VIS <= 1/4 MILE     33
HAZE                     88

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

                 ...DECEMBER 2013 A MONTH OF TEMPERATURE EXTREMES...

DECEMBER 2013 STARTED OUT MILD AND DRY AS A WESTERLY TO
NORTHWESTERLY FLOW ALOFT PRODUCED DOWNSLOPE FLOW ALONG THE LEE OF
THE ROCKIES. THE HIGH TEMPERATURE DURING THE FIRST THREE DAYS OF THE
MONTH AVERAGED 13.0 DEGREES ABOVE NORMAL. THE MILD AND DRY WEATHER
CAME TO AN ABRUPT END AS A DEEP UPPER LEVEL TROUGH OF LOW PRESSURE
ORIGINATING IN ALASKA DROPPED INTO THE WESTERN U.S. AN ARCTIC
AIRMASS ASSOCIATED WITH THIS TROUGH SWEPT ACROSS NORTHEASTERN
COLORADO AROUND MIDDAY ON THE 3RD BRINGING SNOW ON MUCH COLDER
TEMPERATURES TO THE FRONT RANGE OF COLORADO. THIS ARCTIC BLAST WOULD
LEAVE NORTHEASTERN COLORADO IN THE DEEP FREEZE FOR SEVERAL DAYS.
FROM THE 4TH THROUGH THE 8TH HIGH TEMPERATURES DID NOT RISE ABOVE
THE TEENS...WITH MAX TEMPERATURES FROM THE 5TH THROUGH THE 7TH ONLY
IN THE SINGLE DIGITS. DURING THE COLD SNAP...DENVER EXPERIENCED A
SIX CONSECUTIVE DAY STRETCH (DECEMBER 4TH-9TH) WITH LOW TEMPERATURES
BELOW ZERO. DECEMBER OF 1972 STILL HOLDS THE RECORD OF 11
CONSECUTIVE DAYS OF MINIMUM TEMPERATURES BELOW ZERO. MOST NOTABLE
CONSECUTIVE BELOW ZERO STRETCHES IN DECEMBER ARE LISTED BELOW:

11 DAYS DECEMBER 13TH-18TH 1972

6 DAYS DECEMBER 13TH-18TH 1878 6 DAYS DECEMBER 25TH-30TH 1878 6 DAYS
DECEMBER 20TH-25TH 1983 6 DAYS DECEMBER 19TH-24TH 1998

ON THE 9TH...THE COLD AIR BEGAN TO LOSE ITS GRIP ON COLORADO AS THE
LARGE UPPER LOW MOVED INTO THE CENTRAL UNITED STATES. ON THE
10TH...THE HIGH TEMPERATURE IN DENVER FINALLY MADE IT ABOVE
FREEZING. ABOVE NORMAL TEMPERATURES RETURNED TO DENVER FROM THE 12TH
THROUGH THE 14TH. MUCH ABOVE NORMAL TEMPERATURES OCCURRED FROM THE
15TH THROUGH THE 18TH AS UPPER LEVEL HIGH PRESSURE DOMINATED THE
WESTERN U.S AND DRY NORTHWEST FLOW ALOFT PRODUCED A WARM DOWNSLOPE
FLOW ALONG THE LEE OF THE ROCKIES. AVERAGE TEMPERATURES DURING THIS
FOUR DAY PERIOD AVERAGED NEARLY EIGHTEEN DEGREES ABOVE NORMAL. THE
68 DEGREES ON THE 18TH...SET A NEW RECORD FOR THE DATE AND WAS THE
WARMEST DAY OF THE MONTH. ANOTHER UPPER LEVEL STORM SYSTEM AND
ASSOCIATED COLD FRONT BROUGHT LIGHT SNOW AND COLDER TEMPERATURES TO
DENVER FROM THE 19TH THROUGH THE 23RD. TEMPERATURES REBOUNDED TO
ABOVE NORMAL VALUES ON THE 24TH...HOWEVER A COLD FRONT MOVED INTO
DENVER AROUND MIDDAY BRINGING COLDER TEMPERATURES AND A FEW
FLURRIES. DENVER EXPERIENCED DRY WEATHER AND NEAR NORMAL
TEMPERATURES ON CHRISTMAS DAY. A WARMING TREND BEGAN ON THE 26TH AND
CONTINUED THROUGH THE 28TH AS UPPER LEVEL HIGH PRESSURE REBUILT OVER
THE ROCKY MOUNTAIN REGION. ANOTHER SURGE OF COLD AIR BROUGHT COLDER
TEMPERATURES AND LIGHT SNOW TO DENVER LATE ON THE 28TH THROUGH THE
29TH. THE MONTH ENDED ON A MILD AND DRY NOTE.

TEMPERATURES:

THE AVERAGE TEMPERATURE FOR THE MONTH OF DECEMBER WAS 28.4 DEGREES F
WHICH WAS 1.6 DEGREES BELOW NORMAL. DECEMBER OF 1933 WAS THE WARMEST
DECEMBER ON RECORD WITH AN AVERAGE TEMPERATURE OF 43.8 DEGREES F.
THE COLDEST DECEMBER ON RECORD WAS 17.5 DEGREES F BACK IN 1983.

THERE WERE EIGHT DAYS IN WHICH THE DAYTIME HIGH TEMPERATURE DID NOT
EXCEED 32 DEGREES F...AND SIX DAYS IN WHICH THE LOW TEMPERATURE
DROPPED BELOW ZERO. THE HIGHEST TEMPERATURE OF THE MONTH WAS 68
DEGREES WHICH OCCURRED ON THE 18TH...AND THE COLDEST TEMPERATURE OF
THE MONTH WAS -15 DEGREES ON THE MORNING OF THE 5TH.

BELOW IS A LIST OF RECORDS FOR DECEMBER 2013:

DAILY TEMPERATURE RECORDS:

  DATE        TEMPERATURE   TYPE OF RECORD    OLD RECORD   YEAR LAST
SET

DECEMBER 4TH  -13 DEGREES    NEW RECORD LOW    -5 DEGREES      2008^
DECEMBER 5TH  -15 DEGREES   TIED RECORD LOW   -15 DEGREES      1972
DECEMBER 18TH  66 DEGREES   NEW RECORD HIGH    66 DEGREES      1979^
DECEMBER 18TH  40 DEGREES  TIED REC HIGH MIN   40 DEGREES      1917

^ DENOTES AND PREVIOUS YEARS

PRECIPITATION:

PRECIPITATION FOR THE MONTH OF DECEMBER WAS 0.25 INCHES...WHICH IS
0.10 INCHES BELOW THE NORMAL 0F 0.35 INCHES. 0.11 INCHES OF
PRECIPITATION FELL ON THE 4TH WHICH IS THE GREATEST DAILY AMOUNT FOR
THE MONTH.

TOP FIVE WETTEST DECEMBERS:

PRECIPITATION   YEAR

5.21 INCHES     1913 2.84 INCHES     1973 2.34 INCHES     1982 2.32
INCHES     1883 1.70 INCHES     1876

TOP FIVE DRIEST DECEMBERS:

0.00  1881*     *DRIEST MONTH IN DENVER WEATHER HISTORY TRACE 1905
0.01 INCHES 1895 0.01 INCHES 1906 0.03 INCHES 1931, 1977

SNOW:

4.7 INCHES OF SNOW WAS RECORDED DURING THE MONTH...WHICH IS 5.4
INCHES BELOW THE NORMAL OF 8.5 INCHES. THE GREATEST 24 DAILY
SNOWFALL TOTAL OCCURRED ON THE 4TH WHEN 2.8 INCHES FELL.


TOP FIVE SNOWIEST DECEMBERS:

57.4 INCHES 1913*   *SNOWIEST MONTH IN DENVER WEATHER HISTORY 30.8
INCHES 1973 29.4 INCHES 2006 27.1 INCHES 1982 21.5 INCHES 1987

THERE WERE NO DAYS IN WHICH THUNDER WAS OBSERVED AT DENVER
INTERNATIONAL AIRPORT...AND TWO DAYS WITH DENSE FOG WITH A
VISIBILITY AT OR BELOW 1/4 MILE DURING THE MONTH. A PEAK WIND OF 42
MPH FROM A WESTERLY DIRECTION WAS RECORDED ON THE 15TH.

                 ...DENVER`S WEATHER SUMMARY FOR 2013...

 2013 IN DENVER WAS A GOOD YEAR FOR PRECIPITATION WITH 17.60 INCHES
MEASURED WHICH IS 3.30 INCHES ABOVE NORMAL. NEARLY A THIRD OF THE
YEARLY PRECIPITATION FELL IN THE MONTH OF SEPTEMBER. THERE WAS 74.2
INCHES OF SNOW MEASURED DURING THE YEAR...WITH OVER HALF OF THE
TOTAL FALLING IN THE MONTHS OF MARCH AND APRIL. HOWEVER ONLY 8.1
INCHES OF SNOW HAS FALLEN DURING THE 2013-2014 SNOWFALL SEASON SO
FAR. AS FOR TEMPERATURES...THEY WERE SLIGHTLY ABOVE NORMAL FOR THE
YEAR. PRECIPITATION STARTED OUT BELOW NORMAL IN THE MONTH OF
JANUARY...WITH ABOVE NORMAL PRECIPITATION FROM FEBRUARY THROUGH
APRIL. TEMPERATURES DURING THIS PERIOD WERE ALSO AT BELOW NORMAL
VALUES. DENVER EXPERIENCED ABOVE NORMAL TEMPERATURES FROM MAY
THROUGH JULY...WITH BELOW NORMAL PRECIPITATION. THE HIGH TEMPERATURE
REACHED 100 DEGREES ON JUNE 11TH AND JULY 11TH...WHICH WERE THE
HOTTEST TEMPERATURES RECORDED DURING THE YEAR. RAINFALL TRENDED UP
IN AUGUST...WITH RECORD RAINFALL AMOUNTS RECORDED IN THE MONTH OF
SEPTEMBER. FALL LIKE WEATHER RETURNED IN OCTOBER WITH BELOW NORMAL
TEMPERATURES AND ABOVE NORMAL PRECIPITATION. 1.4 INCHES OF SNOW FELL
IN DENVER ON OCTOBER 18TH...WHICH MARKED THE BEGINNING OF THE 2013-
2014 SNOWFALL SEASON. WINTER CAME IN FULL FORCE IN EARLY DECEMBER AS
AN ARCTIC AIRMASS PLUNGED INTO NORTHEASTERN COLORADO. THE
TEMPERATURE PLUMMETED TO 15 DEGREES BELOW ZERO ON THE MORNING OF
DECEMBER 5TH...WHICH ENDED UP BEING THE COLDEST TEMPERATURE DURING
THE YEAR. HOWEVER...THE AVERAGE MONTHLY DECEMBER TEMPERATURE ONLY
MANAGED TO BE SLIGHTLY BELOW NORMAL DUE TO BOUTS OF MILD WEATHER
DURING THE MIDDLE AND END OF THE MONTH. DECEMBER WAS ALSO A DRY
MONTH WITH BELOW NORMAL PRECIPITATION RECORDED.

BELOW ARE SOME OF DENVER`S WEATHER HIGHLIGHTS FOR 2013:

JANUARY 2013 STARTED OUT COLDER THAN NORMAL WITH THE DAILY
TEMPERATURE IN DENVER 14 DEGREES BELOW AVERAGE ON THE 1ST...AND 7
DEGREES BELOW AVERAGE ON BOTH THE 2ND AND 3RD OF THE MONTH. FROM THE
4TH ONWARD...DAILY TEMPERATURES ROSE STEADILY TO A BALMY 60 DEGREES
ON THE 9TH. TEMPERATURES THEN TURNED COLDER WITH THE PASSAGE OF A
COLD FRONT ON THE 9TH. THE ARRIVAL OF A MUCH STRONGER ARCTIC FRONT
ON THE 12TH SENT TEMPERATURES WELL BELOW AVERAGE...WITH DAYTIME
HIGHS IN THE TEENS AND OVERNIGHT LOWS WELL BELOW ZERO FOR THE NEXT
FEW DAYS. TEMPERATURE DEPARTURES FROM NORMAL ON THE 12TH...13TH AND
14TH WERE 32 DEGREES...30 DEGREES AND 29 DEGREES BELOW AVERAGE...
RESPECTIVELY...MAKING THIS THE COLDEST TIME PERIOD OF THE MONTH.
LIGHT SNOW ALSO FELL DURING THIS COLD WAVE WITH 1.1 INCHES FALLING
WITH THE COLD FRONT ON THE 14TH...0.3 INCH ON THE 12TH AND A TRACE
OF SNOW ON THE 13TH AND 14TH.

BY JANUARY 15TH...WARMER TEMPERATURES RETURNED TO THE DENVER AREA
WITH DAYTIME READINGS IN THE 40S ON THE 16TH AND 17TH...LATER
WARMING TO THE 60S ON THE 22ND...24TH AND 25TH. ON THE 29TH...THE
DENVER AREA WAS VISITED BY ANOTHER COLD FRONT WHICH SENT
TEMPERATURES SEVERAL DEGREES BELOW AVERAGE AND BROUGHT 2.7 INCHES OF
SNOW ON THE 28TH AND 0.5 INCH OF SNOW ON THE 29TH.

JANUARY MEAN TEMPERATURE ENDED 0.4 DEGREE BELOW AVERAGE...AND
PRECIPITATION 0.10 INCH BELOW AVERAGE. SNOWFALL FOR THE MONTH
TOTALED 4.6 INCHES.

**************************************

FEBRUARY 2013 BEGAN MILD WITH DAILY TEMPERATURES VARYING FROM 4 TO
14 DEGREES ABOVE AVERAGE FROM THE 1ST TO THE 8TH OF THE MONTH. IN
THE MIDST OF THIS RUN OF MILD WEATHER...DENVER RECORDED A TRACE OF
SNOW ON THE 6TH AND 7TH. TEMPERATURES TURNED COLDER ON THE 9TH...
AND A TRACE OF SNOW FELL THAT DAY. TEMPERATURES FOR THE REMAINDER OF
THE MONTH STRUGGLED TO RETURN TO AVERAGE. ONLY THE 13TH...16TH AND
17TH HAD DAILY TEMPERATURES ABOVE AVERAGE. DENVER RECEIVED NEARLY
ALL OF ITS SNOWFALL DURING THE LAST 9 DAYS OF THE MONTH...WITH 1.7
INCHES ON THE 20TH...2.3 INCHES ON THE 21ST...9.1 INCHES WITH A SNOW
STORM ON THE 24TH...AND 1.0 INCH ON THE 26TH.

FEBRUARY 2013 ENDED 2.4 DEGREE BELOW AVERAGE IN TEMPERATURE...AND
0.40 INCH ABOVE AVERAGE IN PRECIPITATION. SNOWFALL FOR THE MONTH
TOTALED 14.1 INCHES.

*************************************

MARCH 2013 WAS A SNOWY MONTH FOR DENVER WITH A TOTAL OF SEVEN DAYS
RECORDING MEASURABLE SNOWFALL AT DENVER`S INTERNATIONAL AIRPORT. TWO
INCHES FELL ON THE 4TH...5.4 INCHES ON THE 9TH...3.9 INCHES ON THE
11TH...0.5 INCH ON THE 12TH....5.4 INCHES ON THE 22ND...6.4 INCHES
ON THE 23RD AND 0.1 INCH ON THE 24TH. PASSAGE OF A STRONG COLD FRONT
ON THE 22ND SENT TEMPERATURE READINGS DOWNWARD WITH HIGH
TEMPERATURES IN THE 20S AND LOW TEMPERATURES IN THE SINGLE DIGITS ON
THE 23RD... 24TH AND 25TH. TEMPERATURES REBOUNDED ON THE 26TH AND
REMAINED ABOVE AVERAGE FOR THE REMAINING DAYS OF THE MONTH.

MARCH 2013 ENDED 2.7 DEGREE BELOW AVERAGE IN TEMPERATURE...AND 0.55
INCH ABOVE AVERAGE IN PRECIPITATION. SNOWFALL FOR THE MONTH TOTALED
23.5 INCHES.

**************************************

APRIL 2013 WAS BOTH COLD AND SNOWY FOR DENVER. THE MONTH STARTED OUT
WARMER THAN AVERAGE WITH HIGH TEMPERATURES RANGING FROM 60 DEGREES
ON THE 3RD TO 72 DEGREES ON THE 5TH. TEMPERATURES REMAINED ON THE
MILD SIDE THROUGH THE 8TH WITH A HIGH OF 71. ON THE 9TH...THE DENVER
AREA SAW TEMPERATURES PLUNGE WITH THE PASSAGE OF A STRONG ARCTIC
COLD FRONT THAT RESULTED IN A HIGH TEMPERATURE OF ONLY 22 DEGREES ON
THE 9TH AND 23 DEGREES ON THE 10TH. FROM THE 9TH TO THE 11TH...6.6
INCHES OF SNOW FELL AT THE DENVER INTERNATIONAL AIRPORT WITH THE
BULK OF THIS SNOW FALLING ON THE 9TH. ON THE 10TH TEMPERATURES ROSE
SIGNIFICANTLY AND REMAINED NEAR AVERAGE FOR THE NEXT FEW DAYS. FOR
THE REMAINDER OF THE MONTH...TEMPERATURES CONTINUED TO BOUNCE
AROUND...SWINGING FROM A HIGH OF ONLY 30 DEGREES ON THE 23RD TO A
VERY WARM HIGH TEMPERATURE OF 80 DEGREES ON THE 29TH.

APRIL 2013 ENDED 5.7 DEGREE BELOW AVERAGE IN TEMPERATURE...AND 0.16
INCH ABOVE AVERAGE IN PRECIPITATION. SNOWFALL FOR THE MONTH TOTALED
20.4 INCHES.

******************************************

MAY 2013 IN DENVER WAS MARKED BY WARMER THAN AVERAGE TEMPERATURES
AND BELOW AVERAGE PRECIPITATION. SLOW TO WARM DURING THE FIRST
COUPLE OF DAYS WITH THE AVERAGE DAILY TEMPERATURE RUNNING 20 DEGREES
BELOW AVERAGE...TEMPERATURE READINGS STEADILY ROSE AND BY THE MIDDLE
OF THE MONTH DAYTIME TEMPERATURES HAD MANAGED TO WARM TO THE LOW AND
MIDDLE 80S. EXCEPT FOR SLIGHTLY BELOW AVERAGE TEMPERATURES ON
20TH...21ST...23RD...29TH...30TH AND 31ST...THE DAILY TEMPERATURES
FOR THE REMAINDER OF THE MONTH RANGED FROM 5 TO 9 DEGREES ABOVE
AVERAGE. DENVER SAW ITS ONLY SNOWFALL ON THE FIRST TWO DAYS OF THE
MONTH WITH 3.2 INCHES ON THE 1ST AND 0.2 INCHES ON THE 2ND.
MEASURABLE RAINFALL WAS RECORDED ON THE 7TH...8TH...15TH...20TH...
22ND AND THE 29TH...TOTALLY 0.57 INCH.

MAY 2013 ENDED 0.8 DEGREE ABOVE AVERAGE IN TEMPERATURE...AND 1.30
INCH BELOW AVERAGE IN PRECIPITATION. SNOWFALL FOR THE MONTH TOTALED
3.4 INCHES.

*********************************************

JUNE 2013 STARTED OUT WITH BELOW NORMAL TEMPERATURES...WITH SIX OUT
OF THE FIRST SEVEN DAYS BEING BELOW NORMAL. THE LOW TEMPERATURE OF
39 DEGREES ON THE MORNING OF THE 2ND WAS THE COLDEST TEMPERATURE OF
THE MONTH. UPPER LEVEL HIGH PRESSURE OVER THE ROCKY MOUNTAIN REGION
AND SOUTHERN PLAINS STATES BROUGHT A STRETCH OF 90 DEGREE + WEATHER
TO DENVER FROM THE 10TH THROUGH THE 14TH. RECORD HIGH TEMPERATURES
WERE RECORDED ON THE 10TH AND 11TH...WITH THE 100 DEGREES ON THE
11TH BEING THE HOTTEST DAY OF THE MONTH.

FROM THE 15TH THE 18TH...THE UPPER RIDGE SHIFTED EAST WHICH ALLOWED
A COUPLE WEAK COLD FRONTS AND A SLIGHT INCREASE IN MOISTURE TO MOVE
INTO NORTHEASTERN COLORADO. THIS RESULTED IN COOLER
TEMPERATURES...HOWEVER TEMPERATURES STILL REMAINED ABOVE NORMAL. ON
THE 18TH...A TORNADO MOVED ACROSS THE EASTERN SIDE OF DIA. THE DIA
ASOS REPORTED A WIND GUST OF 97 MPH AT 2:27 PM. DENVER EXPERIENCED
HOT AND DRY WEATHER FROM THE 19TH-21ST BEFORE ANOTHER WEAK COLD
FRONT COOLED TEMPERATURES ON THE 22ND AND 23RD. DIA MEASURED 0.51
INCHES OF RAIN FROM A THUNDERSTORM ON THE 23RD WHICH WAS THE
GREATEST DAILY PRECIPITATION FOR THE MONTH. THE MONTH ENDED WITH HOT
AND DRY WEATHER FROM THE 24TH-28TH...WITH NEAR NORMAL TEMPERATURES
THE FINAL TWO DAYS OF THE MONTH.

JUNE 2013 ENDED 3.7 DEGREES ABOVE AVERAGE IN TEMPERATURE...AND 1.23
INCH BELOW AVERAGE IN PRECIPITATION.

************************************************

JULY 2013 IN DENVER STARTED OUT WITH BELOW NORMAL TEMPERATURES WITH
LIGHT PRECIPITATION ON THE FIRST. UPPER LEVEL HIGH PRESSURE THEN
BUILT OVER THE ROCKY MOUNTAIN REGION WHICH RESULTED IN ABOVE NORMAL
TEMPERATURES FROM THE 3RD THROUGH THE 13TH. TEN OUT OF ELEVEN DAYS
DURING THIS PERIOD HAD TEMPERATURES IN THE 90`S...WITH THE 100
DEGREES ON THE 11TH WAS THE HOTTEST DAY OF THE MONTH. FROM THE 12TH
THROUGH THE 16TH...AN UPPER LEVEL LOW TOOK A VERY UNUSUAL TRACK FROM
WEST VIRGINIA TO SOUTHERN NEW MEXICO. COOLER AND VERY MOIST AIR
ASSOCIATED WITH THIS SYSTEM PRODUCED OVER 3 INCHES OF RAIN IN
WHEATRIDGE ON THE 14TH AND 0.87 AT DIA ON THE 15TH. FROM THE 17TH
THROUGH THE 26TH TEMPERATURE REMAINED AT NEAR NORMAL VALUES...WITH
ONLY A TRACE OF PRECIPITATION MEASURED. A WEAK COLD FRONT BROUGHT
COOLER TEMPERATURES AND INCREASED PRECIPITATION TO DENVER FOUR OF
THE LAST 5 DAYS OF THE MONTH.

JULY 2013 ENDED 0.1 DEGREE ABOVE AVERAGE IN TEMPERATURE...AND -0.18
INCH BELOW AVERAGE IN PRECIPITATION.

*************************************************

AUGUST 2013 STARTED OUT HOT AND DRY WITH ABOVE NORMAL TEMPERATURES
THE FIRST TWO DAYS OF THE MONTH. A WEAK COLD FRONT COMBINED WITH AN
UPPER LEVEL DISTURBANCE AND MONSOONAL MOISTURE PRODUCED HEAVY RAIN
AND WIDESPREAD SEVERE WEATHER ACROSS THE FRONT RANGE URBAN CORRIDOR
ON THE 3RD. SEVERE THUNDERSTORMS PRODUCED VERY HEAVY RAIN AND
EXTENSIVE WIND DAMAGE ACROSS ERIE. VERY HEAVY RAIN ALSO PRODUCED
FLASH FLOODING IN PARTS OF AURORA. SOME AREAS AROUND THE FRONT RANGE
RECEIVED 3.5 INCHES OF RAIN...WITH 0.66 INCHES OF RAIN AND A WIND
GUST OF 55 MPH AT DIA DURING THE EVENT.

TEMPERATURES REMAINED SLIGHTLY ABOVE NORMAL THROUGH THE 6TH...WITH A
STRETCH OF BELOW NORMAL TEMPERATURES FROM THE 7TH THROUGH THE 15TH.
ONLY VERY LIGHT PRECIPITATION OCCURRED DURING THAT PERIOD. ABOVE
NORMAL TEMPERATURES RETURNED TO DENVER BY THE 16TH AND CONTINUED
THROUGH THE END OF THE MONTH AS UPPER LEVEL HIGH PRESSURE
REESTABLISHED OVER THE ROCKY MOUNTAIN REGION. RECORD HIGH
TEMPERATURES OF 97 AND 99 DEGREES WERE RECORDED ON THE 17TH AND 20TH
RESPECTIVELY. INCREASED MOISTURE BEHIND A COLD FRONT COMBINED WITH
MONSOONAL MOISTURE PRODUCED SEVERE WEATHER AND HEAVY RAIN ACROSS
METRO DENVER AND THE PALMER DIVIDE ON THE 22ND. DIA MEASURED 1.94
INCHES OF RAIN ALONG WITH A WIND GUST OF 53MPH. THE 1.94 INCHES OF
PRECIPITATION SET A RAINFALL RECORD THE DATE.

AUGUST 2013 ENDED 2.1 DEGREES ABOVE AVERAGE IN TEMPERATURE...AND -
1.09 INCHES ABOVE AVERAGE IN PRECIPITATION.

**************************************************

SEPTEMBER 2013 GOT OFF TO A HOT AND DRY START AS A STRONG AND
PERSISTENT UPPER LEVEL RIDGE OF HIGH PRESSURE REMAINED CENTERED OVER
COLORADO. DENVER EXPERIENCED A SEVEN DAY STRETCH OF 90+ DEGREE
WEATHER FROM THE 2ND THROUGH THE 8TH...WITH THREE DAILY HIGH
TEMPERATURE RECORDS TIED OR BROKEN DURING THIS PERIOD. THIS HOT AND
DRY PERIOD WOULD FINALLY END BY THE 9TH AS THE UPPER RIDGE SHIFTED
INTO THE CENTRAL PLAINS STATES...AND A COLD FRONT MOVED INTO
NORTHEASTERN COLORADO. THIS FRONT TRIGGERED STRONG THUNDERSTORMS
WITH VERY HEAVY RAIN AND HAIL ACROSS THE INTERSTATE 76 CORRIDOR OF
THE DENVER METRO AREA. BY THE 1OTH...THE UPPER HIGH WAS CENTERED
OVER THE SOUTHERN MISSISSIPPI VALLEY...WITH AN UPPER LEVEL LOW
PRESSURE SYSTEM CENTERED OVER SOUTHERN NEVADA. THIS PATTERN PRODUCED
A DEEP SOUTHERLY FLOW OVER THE REGION WHICH PUMPED COPIOUS AMOUNTS
OF MONSOONAL MOISTURE INTO COLORADO FROM THE SOUTH. IN ADDITION...A
WEAK STATIONARY FRONT STRETCHED ALONG THE FRONT RANGE FOOTHILLS INTO
THE PALMER DIVIDE. THIS RESULTED IN VERY COOL TEMPERATURES AND
MODERATE TO HEAVY RAIN ACROSS METRO DENVER...PALMER DIVIDE AND
FRONT RANGE FOOTHILLS. ON THE 11TH...THE STATIONARY FRONT REMAINED
OVER THE AREA WITH DEEP SUBTROPICAL MOISTURE CONTINUING FLOW INTO
COLORADO FROM THE SOUTH. BY LATE AFTERNOON OF THE 11TH...A WEAK
UPPER LEVEL DISTURBANCE MOVED INTO THE DENVER METRO AREA AND STALLED
NEAR ERIE. HEAVY RAIN BANDS ASSOCIATED WITH THIS DISTURBANCE
PRODUCED VERY HEAVY RAIN AND FLASH FLOODING ACROSS THE FOOTHILLS
FROM NORTHERN JEFFERSON COUNTY TO THE WYOMING BORDER EASTWARD INTO
THE ADJACENT PLAINS. LARIMER...BOULDER AND SOUTHWESTERN WELD
COUNTIES AS WELL AS PARTS OF AURORA WERE HARDEST HIT WITH 5 TO 9
INCHES OF RAINFALL RECORDED FROM LATE AFTERNOON ON THE 11TH THROUGH
THE MORNING OF THE 12TH. ON THE 12TH...VERY COOL TEMPERATURES ALONG
WITH AREAS OF HEAVY RAIN CONTINUED WITH AN ADDITIONAL 2 TO 6 INCHES
OF RAIN ACROSS THE FOOTHILLS AND EASTERN SECTIONS OF DENVER.
FLOODING BECAME MORE SEVERE AND WIDESPREAD DURING THE EVENING OF THE
12TH AS THE RAIN CONTINUED....WITH MANY ROADS CLOSED. RAIN DECREASED
ON THE 13TH...HOWEVER THE FLOOD WATERS SPREAD INTO THE PLAINS OF
LARIMER AND WELD COUNTIES. MORE HEAVY RAIN DEVELOPED ACROSS METRO
DENVER ON THE 14TH...WITH UP TO THREE INCHES OF RAIN MEASURED IN
PARTS OF AURORA...WITH SOME FLOODING REPORTED. ON THE 15TH...A WEAK
COLD FRONT MOVED INTO THE REGION BRINGING VERY COOL TEMPERATURES AND
MORE HEAVY RAIN TO THE AREA. ONE TO THREE INCHES OF RAIN WAS
MEASURED IN MANY AREAS...WITH FLOODING REPORTED FROM THE NORTHERN
SUBURBS OF DENVER NORTH INTO BROOMFIELD AND SOUTHWESTERN WELD
COUNTY. TOTAL RAINFALL FROM THIS EVENT RANGED FROM UNDER THREE
INCHES NEAR DOWNTOWN DENVER TO OVER 17 INCHES AROUND BOULDER AND
PARTS OF AURORA. WARMER AND DRIER WEATHER RETURNED TO THE THE FRONT
RANGE OF COLORADO ON THE 16TH AND CONTINUED THROUGH THE 21ST...AS A
DRIER SOUTHWESTERLY FLOW ALOFT DEVELOPED OVER THE REGION. UPPER
LEVEL STORM SYSTEMS BROUGHT ADDITIONAL RAINFALL TO DENVER ON THE
22ND...23RD AND THE 27TH...WITH THE COLD FRONT ON THE 27TH BRINGING
FALL LIKE TEMPERATURES TO NORTH CENTRAL AND NORTHEASTERN COLORADO.
MILD AND DRY WEATHER RETURNED TO DENVER THE LAST FEW DAYS OF THE
MONTH AS UPPER LEVEL HIGH PRESSURE BUILT OVER THE ROCKY MOUNTAIN
REGION.

SEPTEMBER 2013 ENDED 3.0 DEGREES ABOVE AVERAGE IN TEMPERATURE...AND
4.65 INCHES ABOVE AVERAGE IN PRECIPITATION.

**************************************************

OCTOBER 2013 ZONAL FLOW DOMINATED MUCH OF THE WEATHER PATTERN DURING
THE BEGINNING OF THE MONTH WITH HIGH TEMPERATURES IN THE MID 70S FOR
THE FIRST FEW DAYS. AROUND THE 3RD OF THE MONTH A LOW PRESSURE
SYSTEM DROPPED DOWN FROM CANADA AND THE NORTHWESTERN UNITED STATES
BRINGING MUCH COOLER AIR DOWN INTO COLORADO. A FRONT MOVED THROUGH
THE STATE DROPPING SNOW OVER THE MOUNTAINS AND MUCH OF THE FOOTHILLS
AND METRO AREA. MANY PLACES RECEIVED THEIR FIRST MEASURABLE SNOW OF
THE SEASON ON THIS DAY. AS THAT LOW PRESSURE SYSTEM MOVED NORTHEAST
OUT OF THE AREA IT WAS REPLACED BY EXTENSIVE RIDGING THAT WAS THE
CAUSE OF A DEEPLY ROOTED HIGH PRESSURE SYSTEM OVER MUCH OF THE
SOUTHWEST AND PACIFIC REGION. THIS STAYED IN PLACE FOR THE NEXT FEW
DAYS BRINGING HIGH TEMPERATURES BACK INTO THE UPPER 70S FOR MUCH OF
THE STATE. AROUND THE 10TH OF THE MONTH ANOTHER LOW PRESSURE SYSTEM
DROPPED DOWN FROM THE NORTHWEST INTO PORTIONS OF SOUTHERN NEVADA AND
THE DESERT SOUTHWEST. AS THE SYSTEM MADE A SHARP TURN INTO THE
COLORADO REGION IT BROUGHT COOLER TEMPERATURES AND PRECIPITATION. AS
THE SYSTEM EXITED IT WAS REPLACED BY A MORE ZONAL PATTERN WITH A
SURFACE HIGH PRESSURE THAT KEPT TEMPERATURES IN THE UPPER 60S. AN
UPPER LEVEL TROUGH AND SURFACE FRONT MOVED IN ON THE 14TH DROPPING
THE TEMPERATURE 15 DEGREES AND A TENTH OF AN INCH AT THE AIRPORT.
THE SURFACE LOW STAYED AROUND FOR A FEW DAYS AS THE UPPER LEVEL LOW
CENTERED ITSELF OVER THE CENTRAL UNITED STATES DROPPING THE
TEMPERATURE ANOTHER 10 DEGREES FOR A HIGH OF 43 ON THE 15TH. OVER
THE NEXT FEW DAYS A COLD CORE HIGH SET-UP FORMED WITH A TROUGH IN
THE UPPER LEVELS AND A SURFACE HIGH PRESSURE OVER THE REGION
BRINGING DRY CONDITIONS AND COOLER TEMPERATURES FOR THE NEXT FEW
DAYS. ON THE 18TH A COLD FRONT DROPPED DOWN FROM WITH A SURFACE
TROUGH OVER SOUTHEASTERN PORTIONS OF THE STATE BRINGING TEMPERATURES
DOWN TO THE LOWER 40S AND OUR SECOND DOSE OF MEASURABLE SNOW TO
DENVER. DENVER INTERNATIONAL AIRPORT REPORTED 1.4 INCHES OF SNOW
DURING THIS TIME. NORTHWEST FLOW DOMINATED OVER THE NEXT FEW DAYS
KEEPING TEMPERATURES IN THE MID TO UPPER 50S AND LOWER 60S. A HIGH
PRESSURE SYSTEM STARTED TO BUILD IN OVER THE WEST COAST AROUND THE
20TH OF THE MONTH BRINGING WARMER TEMPERATURES AND DRY CONDITIONS TO
OUR REGION WITH TEMPERATURES ONCE AGAIN REACHING INTO THE LOWER 70S.
THIS PATTERN PERSISTED UNTIL THE 27TH WHEN A LOW FROM THE PACIFIC
MOVED EASTWARD OVER EASTERN NEVADA AND A SURFACE COLD FRONT DROPPED
DOWN INTO COLORADO BRINGING A TRACE OF SNOW TO THE AIRPORT AND BELOW
NORMAL TEMPERATURES. OVER THE NEXT FEW DAYS OF THE MONTH IT
CONTINUED TO TRACK TO THE NORTHWEST BRINGING COOL AND CLOUDY
CONDITIONS. INCREASED MOISTURE AND DROPPING TEMPERATURES ALSO
BROUGHT HEAVY FOG TO THE AREA AND HIGH WINDS ON HALLOWEEN INTO THE
EVENING AS THE SYSTEM EXITED.

OCTOBER 2013 ENDED 3.2 DEGREES BELOW AVERAGE IN TEMPERATURE...AND
0.30 INCHES BELOW AVERAGE IN PRECIPITATION.

****************************************************

NOVEMBER 2013 WAS AN UNEVENTFUL MONTH FOR WEATHER WITH ABOVE NORMAL
TEMPERATURES AND BELOW NORMAL PRECIPITATION. TWENTY TWO OUT THE
THIRTY DAYS IN THE MONTH HAD ABOVE NORMAL TEMPERATURES...WITH ONLY
ONE DAY HAVING MEASURABLE SNOWFALL. NOVEMBER 2013 ENDED 2.6 DEGREES
ABOVE AVERAGE IN TEMPERATURE...AND 0.34 INCH BELOW AVERAGE IN
PRECIPITATION.
$$



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