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

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CXUS55 KBOU 011143
CLMDEN

CXUS55 KBOU 011137
CLMDEN

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOULDER, CO

210 AM MDT SUN SEP 1 2013

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

...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF AUGUST 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   08/08/1878
 LOW               40   08/26/1910
                        08/25/1910
                        08/24/1910
HIGHEST            99   08/20       105      -6       98  08/27
                                                          08/03
                                                          08/06
LOWEST             52   08/09        40      12       47  08/17
AVG. MAXIMUM     89.4              87.2     2.2     91.0
AVG. MINIMUM     59.8              57.9     1.9     58.9
MEAN             74.6              72.5     2.1     75.0
DAYS MAX >= 90     16              11.5     4.5       20
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.0     0.0        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.85   1979
 MINIMUM         0.02   1924
TOTALS           2.78              1.69    1.09     0.11
DAILY AVG.       0.09              0.05    0.04     0.00
DAYS >= .01         7               8.6    -1.6        1
DAYS >= .10         2               4.3    -2.3        1
DAYS >= .50         2               1.2     0.8        0
DAYS >= 1.00        1               0.3     0.7        0
GREATEST
 24 HR. TOTAL    1.95   08/21 TO 08/22           08/11 TO 08/11
                                                          08/10 TO 08/11
                                                          08/11 TO 08/11
 STORM TOTAL       MM                                 MM
 (MM/DD(HH))            MM                    08/11(00) TO 08/11(00)
                                                 08/11(00) TO 08/11(00)1
                                                 08/11(00) TO 08/11(00)1

SNOWFALL (INCHES)
RECORDS
 TOTAL             MM   MM
TOTALS            0.0               0.0

DEGREE_DAYS
HEATING TOTAL       0                10     -10        0
 SINCE 7/1          0                16     -16        0
COOLING TOTAL     308               244      64      319
 SINCE 1/1        866               688     178     1122

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

WIND (MPH)
AVERAGE WIND SPEED              8.8
RESULTANT WIND SPEED/DIRECTION   3/204
HIGHEST WIND SPEED/DIRECTION    43/110    DATE  08/03
HIGHEST GUST SPEED/DIRECTION    55/060    DATE  08/03

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            4
NUMBER OF DAYS PC             23
NUMBER OF DAYS CLOUDY          4

AVERAGE RH (PERCENT)     48

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                2     RAIN                       3
LIGHT RAIN               11     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       4     FOG W/VIS <= 1/4 MILE      2
HAZE                     10

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

...AUGUST 2013 ABOVE NORMAL TEMPERATURES AND PRECIPITATION...

AUGUST 2013 GOT OFF TO A HOT START WITH TEMPERATURES IN THE LOW TO
MID 90`S DURING THE FIRST THREE DAYS OF THE MONTH. THIS WAS DUE TO A
STRONG UPPER LEVEL RIDGE OF HIGH PRESSURE CENTERED OVER WEST TEXAS.


ON THE EVENING OF THE 2ND...A WEAK COLD FRONT MOVED INTO
NORTHEASTERN COLORADO BUT DID NOT PUSH WESTWARD INTO THE DENVER
METRO AREA. FOG AND LOW CLOUDS DEVELOPED OVERNIGHT ACROSS THE FAR
NORTHEASTERN PLAINS AND CONTINUED INTO THE LATE MORNING OF THE
3RD...RESULTING IN TEMPERATURES IN THE 60`S AND 70`S.
HOWEVER...DENVER UNDER MOSTLY CLEAR SKIES CLIMBED INTO THE LOW 90`S.
BY EARLY AFTERNOON...SEVERE THUNDERSTORMS ERUPTED ACROSS MORGAN AND
WASHINGTON COUNTIES. THESE STORMS SENT OUT A VERY STRONG AND MOIST
OUTFLOW BOUNDARY WHICH RAPIDLY MOVED WESTWARD INTO THE FRONT RANGE
URBAN CORRIDOR. AT THE SAME TIME...A WEAK UPPER LEVEL DISTURBANCE
WAS APPROACHING THE FRONT RANGE FROM THE SOUTHWEST. IN
ADDITION...MONSOONAL MOISTURE WAS MOVING INTO THE REGION FROM THE
SOUTHEAST. THIS SCENARIO PRODUCED SEVERE WEATHER AND HEAVY RAIN
ACROSS MUCH OF THE FRONT RANGE URBAN CORRIDOR FROM MID AFTERNOON
INTO THE EVENING HOURS. LARGE HAIL FELL FROM GREELEY AND FORT
COLLINS NORTH TO THE WYOMING BORDER...WITH NEAR SOFTBALL SIZED HAIL
REPORTED IN THE WELLINGTON AREA. SEVERE THUNDERSTORMS ALSO 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. DENVER
INTERNATIONAL AIRPORT RECEIVED 0.66 INCHES OF RAIN ALONG WITH A WIND
GUST OF 55 MPH DURING THIS EVENT.

ON THE 4TH...THE UPPER RIDGE OF HIGH PRESSURE WEAKENED AND MOVED
INTO EASTERN TEXAS. THIS RESULTED IN SLIGHTLY COOLER TEMPERATURES ON
THE 5TH AND 6TH...HOWEVER...TEMPERATURES STILL REMAINED SLIGHTLY
ABOVE NORMAL. ON THE 7TH...A COLD FRONT MOVED ACROSS NORTHEASTERN
COLORADO...WHICH BROUGHT MUCH COOLER TEMPERATURES TO DENVER FROM THE
7TH THROUGH THE 9TH. THE HIGH TEMPERATURE ON THE 7TH ONLY MANAGED TO
REACH 73 DEGREES WHICH WAS THE COOLEST DAY OF THE MONTH. BELOW
NORMAL TEMPERATURES CONTINUED ACROSS THE REGION THROUGH THE 15TH.
ABOVE NORMAL TEMPERATURES RETURNED TO DENVER BY THE 16TH AND
CONTINUED THROUGH THE 21ST AS UPPER LEVEL HIGH PRESSURE
REESTABLISHED OVER THE ROCKY MOUNTAIN REGION. HIGH TEMPERATURES IN
THE 90`S WERE RECORDED EACH DAY DURING THIS PERIOD...WITH RECORD
HIGHS OF 97 AND 99 DEGREES ON THE 17TH AND 20TH RESPECTIVELY. ON THE
22ND...A WEAK COLD FRONT MOVED INTO NORTHEASTERN COLORADO ENDING THE
90 DEGREE STREAK IN DENVER. INCREASING MOISTURE BEHIND THE
FRONT...COMBINED WITH AN UPPER LEVEL DISTURBANCE AND MONSOONAL
MOISTURE FLOWING INTO COLORADO FROM THE SOUTHWEST SET UP THE STAGE
FOR MORE SEVERE WEATHER AND HEAVY RAIN ACROSS DENVER AND THE PALMER
DIVIDE. KEN CARYL REPORTED GOLFBALL SIZED HAIL AND STREET
FLOODING...WHILE DENVER INTERNATIONAL AIRPORT RECEIVED 1.94 INCHES
OF RAIN ALONG WITH A WIND GUST OF 53 MPH. THE 1.94 INCHES OF RAIN
SET A NEW RECORD RAINFALL FOR THE DATE. ON THE 23RD...THE UPPER
RIDGE SHIFTED EASTWARD INTO THE CENTRAL PLAINS STATES...AS AN UPPER
LEVEL LOW PRESSURE TROUGH DEEPENED ALONG THE WEST COAST. THIS
PATTERN PUMPED MONSOONAL MOISTURE INTO THE WESTERN HALF OF COLORADO.
DENVER REMAINED TO THE EAST OF THE MAIN MOISTURE PLUME UNDER THE
WESTERN EDGE OF THE UPPER RIDGE. THIS PATTERN RESULTED IN ABOVE
NORMAL TEMPERATURES ACROSS DENVER THE LAST EIGHT DAYS OF THE MONTH.

TEMPERATURES:

THE AVERAGE TEMPERATURE FOR THE MONTH OF AUGUST WAS 74.6 DEGREES F
WHICH WAS 2.1 DEGREES ABOVE NORMAL. AUGUST OF 2011 WAS THE WARMEST
AUGUST ON RECORD WITH AN AVERAGE TEMPERATURE OF 77.0 DEGREES F. THE
COLDEST AUGUST ON RECORD WAS 66.5 DEGREES F BACK IN 1915.

THERE WERE 16 DAYS IN WHICH THE MAXIMUM TEMPERATURE EXCEEDED 90
DEGREES...AND NO DAYS IN WHICH THE DAYTIME HIGH TEMPERATURE DID NOT
EXCEED 32 DEGREES F. THE HIGHEST TEMPERATURE OF THE MONTH WAS 99
DEGREES WHICH OCCURRED ON THE 20TH AND THE COLDEST TEMPERATURE OF
THE MONTH WAS 52 DEGREES ON THE MORNING OF THE 2OTH.

BELOW IS A LIST OF TEMPERATURE RECORDS FOR AUGUST 2013:

DAILY RECORDS:

  DATE      TEMPERATURE   TYPE OF RECORD    OLD RECORD   YEAR LAST
SET

AUGUST 17TH  97 DEGREES    RECORD HIGH       96 DEGREES      1994
AUGUST 20TH  99 DEGREES    RECORD HIGH       98 DEGREES      1987
AUGUST 20TH  70 DEGREES    RECORD HIGH MIN   67 DEGREES      2007


PRECIPITATION:

PRECIPITATION FOR THE MONTH OF AUGUST WAS 2.78 INCHES...WHICH IS
1.09 INCHES ABOVE THE NORMAL 0F 1.69 INCHES. MOST OF THIS FELL ON
THE 22ND WHEN 1.94 INCHES OF PRECIPITATION WAS RECORDED AT DENVER
INTERNATIONAL AIRPORT...WHICH SET A NEW RECORD RAINFALL FOR THE
DATE. THE OLD RECORD OF 0.75 INCHES SET BACK IN 1953. THE WETTEST
AUGUST ON RECORD OCCURRED BACK IN 1979 WHEN 5.85 INCHES OF
PRECIPITATION WAS RECORDED. THE DRIEST AUGUST ON RECORD OCCURRED
BACK IN 1924...WHEN ONLY 0.02 INCHES OF PRECIPITATION WAS RECORDED.

BELOW IS A LIST OF PRECIPITATION RECORDS FOR AUGUST 2013:

  DATE       PRECIPITATION AMOUNT    OLD RECORD   YEAR LAST SET
AUGUST 22      1.94 INCHES         0.75 INCHES      1953

16 THUNDERSTORMS WERE OBSERVED AT DENVER INTERNATIONAL AIRPORT
DURING THE MONTH. THERE WERE FOUR DAYS WITH DENSE FOG WITH A
VISIBILITY AT OR BELOW 1/4 MILE DURING THE MONTH. A PEAK WIND OF 55
MPH FROM A NORTHEASTERLY DIRECTION WAS RECORDED ON THE 3RD.
$$



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