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

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CLIMATE REPORT
NATIONAL WEATHER SERVICE BOULDER, CO
1041 PM MST THU JAN 1 2015

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

...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 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              79   12/05/1939
 LOW              -25   12/22/1990
                        12/24/1876
HIGHEST            66   12/12        62       4       68  12/18
LOWEST            -19   12/30        -4     -13      -15  12/05
AVG. MAXIMUM     44.1              42.8     1.3     42.9
AVG. MINIMUM     18.5              17.1     1.4     14.0
MEAN             31.3              30.0     1.3     28.4
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      5               5.8    -0.8        8
DAYS MIN <= 32     31              29.4     1.6       29
DAYS MIN <= 0       2               2.0     0.0        6

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.21   1913
 MINIMUM         0.00   1881
TOTALS           0.59              0.35    0.24     0.25
DAILY AVG.       0.02              0.01    0.01     0.01
DAYS >= .01         7               4.1     2.9        7
DAYS >= .10         2               1.1     0.9        1
DAYS >= .50         0               0.1    -0.1        0
DAYS >= 1.00        0               0.0     0.0        0
GREATEST
 24 HR. TOTAL    0.18   12/29 TO 12/30           12/03 TO 12/04

SNOWFALL (INCHES)
RECORDS
 TOTAL           57.4   1913
TOTALS           12.0               8.5

DEGREE_DAYS
HEATING TOTAL    1037              1086     -49     1128
 SINCE 7/1       2291              2468    -177     2451
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        701               769     -68      999

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

WIND (MPH)
AVERAGE WIND SPEED              8.7
RESULTANT WIND SPEED/DIRECTION   2/218
HIGHEST WIND SPEED/DIRECTION    41/340    DATE  12/23
HIGHEST GUST SPEED/DIRECTION    52/330    DATE  12/23

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            4
NUMBER OF DAYS PC             19
NUMBER OF DAYS CLOUDY          8

AVERAGE RH (PERCENT)     59

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN                1     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                1     SNOW                       4
LIGHT SNOW                8     SLEET                      0
FOG                      12     FOG W/VIS <= 1/4 MILE      3
HAZE                      4

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

.....DECEMBER 2014 SLIGHTLY WARMER AND WETTER THAN NORMAL.....

WEATHER WAS UNEVENTFUL FOR MUCH OF THE MONTH WITH MILD AND DRY
WEATHER THE FIRST THREE WEEKS OF DECEMBER. HOWEVER...A COUPLE OF
STORM SYSTEMS DID BRING SOME LIGHT SNOW TO DENVER ON THE 14TH AND
16TH. ABOVE NORMAL TEMPERATURES WERE RECORDED 22 OUT OF THE FIRST 25
DAYS OF THE MONTH. THE WEATHER TURNED WETTER AND MUCH COLDER THE
LAST WEEK OF THE MONTH AS A SERIES OF STORM SYSTEMS AND ARCTIC COLD
FRONTS MOVED ACROSS THE STATE.

THE FIRST STORM SYSTEM MOVED INTO COLORADO CHRISTMAS DAY BRINGING
MUCH COLDER TEMPERATURES AND HEAVY SNOW TO NORTH CENTRAL AND
NORTHEASTERN COLORADO. THIS SYSTEM PRODUCED 4 TO 8 INCHES OF SNOW
ALONG THE FRONT RANGE URBAN CORRIDOR...WITH OVER A FOOT OF SNOW IN
SOME FOOTHILL LOCATIONS. DENVER INTERNATIONAL AIRPORT REPORTED 5.1
INCHES OF SNOW FROM THE AFTERNOON OF THE 25TH THROUGH THE EVENING OF
THE 26TH...WITH 3.4 INCHES FALLING ON CHRISTMAS DAY. THIS MAKES
CHRISTMAS DAY OF 2014 THE THIRD SNOWIEST IN DENVER WEATHER HISTORY.
THE ONLY TWO YEARS THAT HAD MORE SNOW ON CHRISTMAS DAY WERE 2007
WITH 7.4 INCHES AND 1894 WITH 6.4 INCHES.

BELOW NORMAL TEMPERATURES CONTINUED THE DAYS AFTER CHRISTMAS...AS A
COUPLE STORM SYSTEMS AND ASSOCIATED ARCTIC COLD FRONTS MOVED ACROSS
COLORADO. SNOW AND BITTER COLD TEMPERATURES MOVED INTO NORTHEASTERN
COLORADO ON THE 29TH...WITH 5.4 INCHES OF SNOW MEASURED AT DENVER
INTERNATIONAL AIRPORT. THE ARCTIC AIRMASS REMAINED ENTRENCHED OVER
THE AREA ON THE 30TH...WITH RECORD LOW TEMPERATURES SET AT MANY
LOCATIONS. THE HIGH TEMPERATURE AT DIA ONLY MANAGED TO REACH 1
DEGREE F WHICH IS A NEW RECORD LOW MAX FOR THE DATE. ON THE EVENING
OF THE 30TH...THE TEMPERATURE PLUMMETED TO 19 DEGREES BELOW ZERO
WHICH SET A RECORD LOW TEMPERATURE FOR THE DATE AS WELL.

TEMPERATURES:

THE AVERAGE TEMPERATURE AT DENVER INTERNATIONAL AIRPORT FOR THE
MONTH OF DECEMBER WAS 31.3 DEGREES F WHICH WAS 1.3 DEGREES ABOVE
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 5 DAYS IN WHICH
THE TEMPERATURE DID NOT EXCEED 32 DEGREES F...AND 2 DAYS WITH LOW
TEMPERATURES AT OR BELOW ZERO DEGREES F. THE HIGHEST TEMPERATURE OF
THE MONTH WAS 66 DEGREES WHICH OCCURRED ON THE 12TH. THE COLDEST
TEMPERATURE OF THE MONTH WAS -19 DEGREES BELOW ZERO ON THE MORNING
OF THE 30TH.

DAILY RECORDS:

DATE      TEMPERATURE    TYPE OF RECORD    OLD RECORD   YEAR LAST SET

DEC 30TH   1 DEGREE      RECORD LOW MAX    8  DEGREES       1915
DEC 30TH -19 DEGREES     RECORD LOW       -11 DEGREES       1898

PRECIPITATION:

PRECIPITATION FOR THE MONTH OF DECEMBER AT DENVER INTERNATIONAL
AIRPORT WAS 0.59 INCHES...WHICH IS 0.24 INCHES ABOVE THE NORMAL OF
0.35 INCHES. THERE WERE 7 DAYS WITH MEASURABLE PRECIPITATION. ON THE
29TH...0.17 INCHES OF PRECIPITATION FELL WHICH IS THE GREATEST DAILY
AMOUNT FOR THE MONTH.

TEN WETTEST DECEMBER`S IN DENVER WEATHER HISTORY SINCE 1872:

5.21 INCHES 1913
2.84 INCHES 1973
2.34 INCHES 1982
2.32 INCHES 1883
1.70 INCHES 1876
1.56 INCHES 1891
1.50 INCHES 1960
1.42 INCHES 1924
1.40 INCHES 1918
1.32 INCHES 1892

TEN DRIEST DECEMBER PRECIPITATION AMOUNTS IN DENVER
WEATHER HISTORY SINCE 1872:

0.00 INCHES 1881
 T   INCHES 1905
0.01 INCHES 1895, 1906
0.03 INCHES 1931, 1977
0.04 INCHES 1890
0.05 INCHES 2002
0.06 INCHES 1928, 1957, 1995
0.09 INCHES 1888, 1946, 1970
0.10 INCHES 1880, 1945, 1980
0.14 INCHES 1887, 2001

SNOW:

12.0 INCHES OF SNOW WAS MEASURED AT DENVER INTERNATIONAL AIRPORT
DURING THE MONTH. THE IS 3.5 INCHES BELOW THE NORMAL OF 8.5 INCHES.
ON THE 29TH...5.4 INCHES OF SNOW WAS MEASURED AT DENVER
INTERNATIONAL AIRPORT...WHICH IS THE GREATEST DAILY SNOWFALL FOR THE
MONTH.

TEN GREATEST MONTHLY DECEMBER SNOWFALL AMOUNTS
IN DENVER WEATHER HISTORY SINCE 1872:

57.4 INCHES 1913
30.8 INCHES 1973
29.4 INCHES 2006
27.1 INCHES 1982
21.5 INCHES 1987
20.9 INCHES 2007
19.6 INCHES 1918
18.4 INCHES 1924
17.8 INCHES 1960
17.5 INCHES 1891

TEN LEAST MONTHLY DECEMBER SNOWFALL AMOUNTS
IN DENVER WEATHER HISTORY SINCE 1872:

0.0 INCHES 1881
T   INCHES 1905, 1906, 2002
0.1 INCHES 1928
0.4 INCHES 1890
0.5 INCHES 1935
0.6 INCHES 1995
0.7 INCHES 1895, 1977
0.8 INCHES 1888, 1931, 1957
0.9 INCHES 1970
1.2 INCHES 1945, 1962, 1980

THERE WERE NO DAYS IN WHICH THUNDER OR HAIL WAS OBSERVED AT DENVER
INTERNATIONAL AIRPORT. THERE WERE 3 DAYS WITH DENSE FOG WITH A
VISIBILITY AT OR BELOW 1/4 MILE DURING THE MONTH. A PEAK WIND OF 52
MPH FROM A NORTHWESTERLY DIRECTION WAS RECORDED ON THE 23RD.

$$


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