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

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CXUS55 KBOU 011418
CLMDEN

CLIMATE REPORT
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
718 AM MST SUN JAN 1 2017

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

...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2016...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2016

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            65   12/30        43      22       69  12/09
LOWEST            -15   12/17        17     -28        0  12/28
                                                          12/17
AVG. MAXIMUM     42.7              42.8    -0.1     40.9
AVG. MINIMUM     12.9              17.1    -4.2     17.9
MEAN             27.8              30.0    -2.2     29.4
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      6               5.8     0.2       10
DAYS MIN <= 32     30              29.4     0.6       28
DAYS MIN <= 0       4               2.0     2.0        2

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.21   1913
 MINIMUM         0.00   1881
TOTALS           0.78              0.35    0.43     0.71
DAILY AVG.       0.03              0.01    0.02     0.02
DAYS >= .01         6               4.1     1.9        5
DAYS >= .10         2               1.1     0.9        3
DAYS >= .50         0               0.1    -0.1        0
DAYS >= 1.00        0               0.0     0.0        0
GREATEST
 24 HR. TOTAL    0.63   12/16 TO 12/17

SNOWFALL (INCHES)
TOTALS            9.7   2016        8.5 NORMAL
RECORDS          57.4   1913
                    T   1905 1906 2002

DEGREE_DAYS
HEATING TOTAL    1146              1086      60     1097
 SINCE 7/1       2042              2468    -426     2187
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        878               769     109      877

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

WIND (MPH)
AVERAGE WIND SPEED              9.2
RESULTANT WIND SPEED/DIRECTION   3/167
HIGHEST WIND SPEED/DIRECTION    37/260    DATE  12/05
HIGHEST GUST SPEED/DIRECTION    46/260    DATE  12/05

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR            7
NUMBER OF DAYS PC             18
NUMBER OF DAYS CLOUDY          6

AVERAGE RH (PERCENT)     57

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                1     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                2     SNOW                       3
LIGHT SNOW                7     SLEET                      0
FOG                      11     FOG W/VIS <= 1/4 MILE      3
HAZE                      6

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

..........DECEMBER 2016...COLDER AND WETTER THAN NORMAL...........

A SERIES OF UPPER LEVEL STORM SYSTEMS MOVING ACROSS COLORADO
RESULTED IN A COLDER AND WETTER THAN NORMAL DECEMBER IN DENVER. THE
TWO MOST NOTABLE STORM SYSTEMS (DECEMBER 6TH-8TH AND DECEMBER 16TH-
18TH) BROUGHT ALL OF THE MONTHLY SNOWFALL AND BITTERLY COLD
TEMPERATURES TO THE DENVER METRO AREA. THE SECOND STORM SYSTEM
BROUGHT HEAVY SNOW TO NORTHEASTERN COLORADO FROM THE 16TH THROUGH
THE 17TH...WITH 4 TO 12 INCHES OF SNOW ACROSS MOST FRONT RANGE URBAN
CORRIDOR LOCATIONS. DENVER INTERNATIONAL AIRPORT MEASURED 8.0 INCHES
WITH THIS STORM. THE MONTH DID END ON A WARM NOTE...WITH A HIGH
TEMPERATURES OF 65 DEGREES ON THE 30TH.

TEMPERATURES:

THE AVERAGE TEMPERATURE AT DENVER INTERNATIONAL AIRPORT FOR THE
MONTH WAS 27.8 DEGREES F, WHICH WAS 2.2 DEGREES BELOW NORMAL. THE
WARMEST DECEMBER ON RECORD OCCURRED IN 1933...WITH AN AVERAGE
MONTHLY TEMPERATURE OF 43.8 DEGREES F. THE COLDEST DECEMBER ON
RECORD WAS 17.4 DEGREES F IN 1983. ON THE 30TH...THE TEMPERATURE
CLIMBED TO 65 DEGREES F WHICH IS THE HIGHEST TEMPERATURE OF THE
MONTH. THE COLDEST TEMPERATURE OF -15 DEGREES F OCCURRED ON THE
EVENING OF THE 17TH...WHICH IS THE COLDEST TEMPERATURE FOR THE MONTH
AND SET A NEW RECORD LOW TEMPERATURE FOR THE DATE. IN ADDITION...THE
MAX TEMPERATURE ON THE 17TH ONLY MANAGED TO REACH 3 DEGREES F WHICH
SET A NEW RECORD LOW MAX TEMPERATURE FOR THE DATE AS WELL. DURING
THE MONTH...THERE WERE SIX DAYS IN WHICH THE MAX TEMPERATURE DID NOT
REACH 32 DEGREES F AND FOUR DAYS IN WHICH THE TEMPERATURE DIPPED
BELOW ZERO.

FIFTEEN WARMEST DECEMBER`S IN DENVER WEATHER HISTORY SINCE 1872:

43.8 1933
41.2 1980
40.9 1939
40.5 1889
39.7 1906
39.6 1946
39.5 1957...1881
39.2 1890
38.8 1896...1875
38.2 1893
38.0 1917
37.5 1975
37.3 1888

FIFTEEN COLDEST DECEMBER`S IN DENVER WEATHER HISTORY SINCE 1872:

17.4 1983
21.2 1909
22.1 1978
22.7 1873
23.1 1913
23.7 1932
24.1 2009
24.3 1914
24.6 1978
24.8 1884
24.9 1972
25.4 1992
25.5 1924
25.7 1990
25.8 1898

PRECIPITATION:

PRECIPITATION FOR THE MONTH OF DECEMBER AT DENVER INTERNATIONAL
AIRPORT WAS 0.78 INCHES...WHICH IS 0.37 INCHES BELOW THE NORMAL OF
0.41 INCHES. THERE WERE 5 DAYS WITH MEASURABLE PRECIPITATION DURING
THE MONTH. 0.45 INCHES OF PRECIPITATION FELL ON THE 16TH...WHICH IS
THE GREATEST DAILY AMOUNT FOR THE MONTH. 9.7 INCHES OF SNOW WAS
MEASURED DURING THE MONTH WHICH IS 2.7 INCHES ABOVE NORMAL.

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

5.21 INCHES 1913
2.84 INCHES 1973
2.34 INCHES 1892
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

ELEVEN DRIEST DECEMBER`S IN DENVER WEATHER HISTORY SINCE 1872:

0.00 INCHES 1881
TRACE       1905
0.01 INCHES 1906...1895
0.03 INCHES 1977...1931
0.04 INCHES 2004...1890
0.05 INCHES 2002...1995

TEN SNOWIEST DECEMBER`S 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

TWELVE LEAST SNOWIEST DECEMBER`S IN DENVER WEATHER HISTORY SINCE 1872:

TRACE      1906...1905...2002
0.1 INCHES 1928
0.4 INCHES 1890
0.5 INCHES 1935
0.6 INCHES 1995
0.7 INCHES 1977...1895
0.8 INCHES 1957...1931...1888


THERE WAS ONE DAY IN WHICH THUNDER WAS OBSERVED AT DENVER
INTERNATIONAL AIRPORT...AND THREE DAYS WITH DENSE FOG WITH A
VISIBILITY AT OR BELOW 1/4 MILE DURING THE MONTH. THE PEAK WIND GUST
OF 46 MPH FROM THE WEST OCCURRED ON THE 5TH.

$$



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