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

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CXUS55 KBOU 011230
CLMDEN

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOULDER, CO
517 AM MST SAT FEB 1 2014

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

...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF JANUARY 2014...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2014

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              76   01/27/1888
 LOW              -29   01/09/1875
HIGHEST            65   01/19        76     -11       66  01/24
LOWEST            -10   01/05       -29      19      -12  01/12
AVG. MAXIMUM     44.9              44.0     0.9     44.6
AVG. MINIMUM     17.3              17.4    -0.1     16.0
MEAN             31.1              30.7     0.4     30.3
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      4               5.5    -1.5        6
DAYS MIN <= 32     30              29.4     0.6       30
DAYS MIN <= 0       3               1.7     1.3        5

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         2.35   1883
 MINIMUM         0.01   1933
                        1934
                        1952
TOTALS           0.94              0.41    0.53     0.31
DAILY AVG.       0.03              0.01    0.02     0.01
DAYS >= .01         9               4.1     4.9        4
DAYS >= .10         3               0.9     2.1        1
DAYS >= .50         0               0.0     0.0        0
DAYS >= 1.00        0               0.0     0.0        0
GREATEST
 24 HR. TOTAL    0.26   01/30 TO 01/31           01/28 TO 01/29
                                                          01/29 TO 01/29
                                                          01/29 TO 01/29
 STORM TOTAL       MM                                 MM
 (MM/DD(HH))            MM                    01/29(00) TO 01/29(00)
                                                 01/29(00) TO 01/29(00)9
                                                 01/29(00) TO 01/29(00)9

SNOWFALL (INCHES)
RECORDS
 TOTAL             MM   MM
TOTALS           14.3               7.0

DEGREE_DAYS
HEATING TOTAL    1046              1063     -17     1067
 SINCE 7/1       3497              3531     -34     3300
COOLING TOTAL       0                 0       0        0
 SINCE 1/1          0                 0       0        0

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

WIND (MPH)
AVERAGE WIND SPEED              10.7
RESULTANT WIND SPEED/DIRECTION   4/230
HIGHEST WIND SPEED/DIRECTION    36/290    DATE  01/12
HIGHEST GUST SPEED/DIRECTION    44/280    DATE  01/12

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR           10
NUMBER OF DAYS PC             14
NUMBER OF DAYS CLOUDY          7

AVERAGE RH (PERCENT)     56

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                0     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                2     SNOW                       5
LIGHT SNOW               11     SLEET                      0
FOG                      11     FOG W/VIS <= 1/4 MILE      4
HAZE                      4

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

............JANUARY 2014 11TH SNOWIEST JANUARY ON RECORD............

JANUARY 2014 STARTED OUT DRY WITH SLIGHTLY BELOW NORMAL TEMPERATURES
THE FIRST TWO DAYS OF THE MONTH. DOWNSLOPE FLOW BROUGHT ABOVE NORMAL
TEMPERATURES TO DENVER ON THE 3RD. SNOW AND MUCH COLDER TEMPERATURES
RETURNED TO THE AREA ON THE 4TH AS AN UPPER LEVEL TROUGH OF LOW
PRESSURE AND ASSOCIATED ARCTIC COLD FRONT MOVED ACROSS THE NORTHERN
AND CENTRAL ROCKIES. ON THE MORNING OF THE 5TH...THE LOW TEMPERATURE
AT DENVER INTERNATIONAL AIRPORT FELL TO TEN DEGREES BELOW
ZERO...WHICH WAS THE COLDEST TEMPERATURE FOR THE MONTH. TEMPERATURES
MODERATED BY THE 7TH...AS THE UPPER TROUGH MOVED INTO THE CENTRAL
PLAINS STATES AND UPPER LEVEL HIGH PRESSURE BUILT OVER THE WESTERN
STATES.

THIS PATTERN LEFT COLORADO UNDER THE INFLUENCE OF A NORTHWEST FLOW
ALOFT...WHICH RESULTED IN DRY WEATHER AND NEAR NORMAL TEMPERATURES
FROM THE 7TH THROUGH THE 16TH. ONLY SOME LIGHT SNOW ASSOCIATED WITH
A COLD FRONT FELL ON THE 14TH. THE UPPER RIDGE OF HIGH PRESSURE
SHIFTED OVER THE ROCKY MOUNTAIN REGION ON THE 19TH...RESULTING IN
ABOVE NORMAL TEMPERATURES. THE HIGH TEMPERATURE OF 65 DEGREES AT
DENVER INTERNATIONAL AIRPORT ON THE 19TH WAS THE WARMEST READING FOR
THE MONTH. ABOVE NORMAL TEMPERATURES CONTINUED THROUGH THE 21ST.
SNOW AND ANOTHER BLAST OF ARCTIC AIR MOVED INTO NORTHEASTERN
COLORADO ON THE 23RD...AS THE UPPER TROUGH OVER THE UPPER MIDWEST
RETROGRADED INTO THE CENTRAL AND NORTHERN ROCKIES. 3.6 INCHES OF
SNOW FELL AT DENVER INTERNATIONAL AIRPORT ON THE 23RD WHICH WAS THE
HIGHEST DAILY SNOWFALL TOTAL FOR THE MONTH.

TEMPERATURES QUICKLY REBOUNDED TO ABOVE NORMAL VALUES ON
THE 24TH...AS DOWNSLOPE FLOW SPREAD ACROSS THE FRONT RANGE URBAN
CORRIDOR AND ADJACENT PLAINS. YET ANOTHER ARCTIC BLAST BROUGHT MUCH
COLDER TEMPERATURES AND SNOW TO DENVER ON THE 27TH AND 28TH. ON THE
29TH HEAVY SNOW DEVELOPED OVER THE MOUNTAINS AS A STRONG AND VERY
MOIST JET STREAM SET UP OVER COLORADO. HOWEVER...DOWNSLOPE FLOW ON
THE LEE SIDE OF THE MOUNTAINS PRODUCED MILD AND DRY WEATHER IN
DENVER. ON THE AFTERNOON OF THE 30TH...A COLD FRONT MOVED INTO
NORTHEASTERN COLORADO. UPSLOPE FLOW BEHIND THE FRONT...COMBINED WITH
LIFT FROM THE JET STREAM PRODUCED SNOW ACROSS THE FRONT RANGE URBAN
CORRIDOR ON THE EVENING OF THE 30TH. THE MONTH ENDED WITH COLD
TEMPERATURES AND SOME LIGHT SNOW ON THE 31ST.

TEMPERATURES:

THE AVERAGE TEMPERATURE FOR THE MONTH OF JANUARY WAS 31.1 DEGREES F
WHICH WAS 0.4 DEGREES ABOVE NORMAL. JANUARY OF 1986 WAS THE WARMEST
JANUARY ON RECORD WITH AN AVERAGE TEMPERATURE OF 40.3 DEGREES F. THE
COLDEST JANUARY ON RECORD WAS 16.9 DEGREES F BACK IN 1930...WHICH
WAS THE COLDEST MONTH IN DENVER WEATHER HISTORY.

THERE WERE FOUR DAYS IN WHICH THE DAYTIME HIGH TEMPERATURE DID NOT
EXCEED 32 DEGREES F...AND THREE DAYS IN WHICH THE LOW TEMPERATURE
DROPPED BELOW ZERO. THE HIGHEST TEMPERATURE OF THE MONTH WAS 65
DEGREES WHICH OCCURRED ON THE 19TH...AND THE COLDEST TEMPERATURE OF
THE MONTH WAS -10 DEGREES ON THE MORNING OF THE 5TH.

PRECIPITATION:

PRECIPITATION FOR THE MONTH OF JANUARY WAS 0.94 INCHES...WHICH IS
0.53 INCHES ABOVE THE NORMAL 0F 0.41 INCHES. 0.22 INCHES OF
PRECIPITATION FELL ON THE 30TH WHICH IS THE GREATEST DAILY AMOUNT
FOR THE MONTH.

SNOW:

14.3 INCHES OF SNOW WAS RECORDED DURING THE MONTH...WHICH IS 7.3
INCHES ABOVE THE NORMAL OF 7.0 INCHES. THIS MAKES JANUARY 2014 THE
11TH SNOWIEST JANUARY ON RECORD.


TOP TEN SNOWIEST JANUARYS:

24.3 INCHES 1992
22.2 INCHES 1949
20.5 INCHES 1883
19.2 INCHES 1948
17.4 INCHES 1959
17.2 INCHES 1962
17.0 INCHES 1891 AND 1987
15.9 INCHES 2007
15.7 INCHES 1951
14.3 INCHES 2014

THERE WERE NO DAYS IN WHICH THUNDER WAS OBSERVED AT DENVER
INTERNATIONAL AIRPORT...AND 4 DAYS WITH DENSE FOG WITH A VISIBILITY
AT OR BELOW 1/4 MILE DURING THE MONTH. A PEAK WIND OF 44 MPH FROM A
WESTERLY DIRECTION WAS RECORDED ON THE 12TH.
$$



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