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

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157
CXUS55 KBOU 020318
CLMDEN

CLIMATE REPORT
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
915 PM MDT MON MAY 1 2017

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

...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF APRIL 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              90   04/30/1992
 LOW               -2   04/02/1975
HIGHEST            79   04/14        90     -11       77  04/23
                        04/13                             04/22
                                                          04/14
LOWEST             24   04/10        -2      26       25  04/01
AVG. MAXIMUM     63.2              61.5     1.7     59.4
AVG. MINIMUM     34.5              33.3     1.2     35.1
MEAN             48.9              47.4     1.5     47.2
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      1               0.3     0.7        0
DAYS MIN <= 32     15              13.0     2.0       11
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         8.24   1900
 MINIMUM         0.03   1963
TOTALS           0.98              1.71   -0.73     2.56
DAILY AVG.       0.03              0.06   -0.03     0.09
DAYS >= .01        10               9.1     0.9       10
DAYS >= .10         5               4.5     0.5        6
DAYS >= .50         0               0.9    -0.9        2
DAYS >= 1.00        0               0.5    -0.5        1
GREATEST
 24 HR. TOTAL    0.22   04/29 TO 04/29
 STORM TOTAL     0.34   04/28 TO 04/29

SNOWFALL (INCHES) APRIL
RECORD           33.8   1933
TOTAL             2.5   2017        6.8

DEGREE_DAYS
HEATING TOTAL     478               529     -51      526
 SINCE 7/1       4803              5731    -928     5230
COOLING TOTAL       0                 1      -1        0
 SINCE 1/1          0                 1      -1        0

FREEZE DATES
RECORD
 EARLIEST     09/08/1962
 LATEST       06/08/2007
EARLIEST      04/01             10/07
LATEST                          05/05
.......................................................

WIND (MPH)
AVERAGE WIND SPEED              11.6
RESULTANT WIND SPEED/DIRECTION   1/121
HIGHEST WIND SPEED/DIRECTION    44/300    DATE  04/09
HIGHEST GUST SPEED/DIRECTION    56/300    DATE  04/09

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            6
NUMBER OF DAYS PC             17
NUMBER OF DAYS CLOUDY          7

AVERAGE RH (PERCENT)     53

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       1
LIGHT RAIN               10     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                1     SNOW                       3
LIGHT SNOW                7     SLEET                      0
FOG                      10     FOG W/VIS <= 1/4 MILE      4
HAZE                      2

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

...APRIL 2017...DRIER AND SLIGHTLY WARMER THAN NORMAL...

THE MONTH STARTED OUT COOL WITH SOME LIGHT PRECIPITATION AS AN UPPER
LEVEL STORM SYSTEM MOVED ACROSS THE SOUTHERN ROCKIES. DRIER AND WARMER
WEATHER RETURNED TO THE REGION ON THE 2ND, WITH COOLER AND WETTER
CONDITIONS ON THE 4TH AS ANOTHER UPPER LEVEL TROUGH AND ASSOCIATED
COLD FRONT MOVED ACROSS THE STATE. LITTLE SNOW ACCUMULATION WAS
MEASURED AT DIA WITH THIS SYSTEM, HOWEVER ARVADA MEASURED OVER 10
INCHES OF SNOW AND 12 TO 18 INCHES WAS MEASURED ACROSS THE FOOTHILLS
WEST OF DENVER. DENVER EXPERIENCED DRIER AND MUCH WARMER WEATHER FROM
THE 6TH THROUGH THE 8TH AS UPPER LEVEL HIGH PRESSURE BUILT OVER
THE ROCKY MOUNTAIN REGION. AN UPPER LEVEL STORM SYSTEM MOVED OVER THE
AREA AND BROUGHT COOLER, WINDIER WEATHER TO NORTH CENTRAL AND
NORTHEASTERN COLORADO FROM THE 9TH THROUGH THE 10TH. UPPER LEVEL HIGH
PRESSURE DOMINATED THE AREA FROM THE 11TH THROUGH THE 19TH, WITH HIGH
TEMPERATURES AT OR ABOVE 70 DEGREES EIGHT OUT THE NINE DAYS DURING THIS
PERIOD. ANOTHER STORM SYSTEM THAT MOVED ACROSS THE NORTHERN AND CENTRAL
ROCKIES BROUGHT COOLER TEMPERATURES AND MUCH NEEDED PRECIPITATION TO THE
FRONT RANGE OF COLORADO FROM THE 20TH THROUGH THE 22ND. ALMOST A WEEK
LATER, A MUCH STRONGER STORM SYSTEM TRACKED FROM THE FOUR CORNERS REGION
ACROSS CENTRAL NEW MEXICO FROM THE 28TH THROUGH THE 29TH. THIS SYSTEM
PRODUCED HEAVY SNOW ACROSS THE FOOTHILLS, PALMER DIVIDE, AND PORTIONS OF
METRO DENVER. ONE TO TWO FEETOF SNOW FELL ACROSS THE CENTRAL AND
SOUTHERN FOOTHILLS, WITH 6 TO 12 INCHES REPORTED ACROSS THE PALMER DIVIDE.
THE DENVER METRO AREA HAD ANYWHERE FROM 2 TO 15 INCHES OF SNOW, WITH THE
HEAVIEST AMOUNTS OVER SOUTHERN KEN CARYL.

TEMPERATURES:

THE AVERAGE TEMPERATURE AT DENVER INTERNATIONAL AIRPORT FOR THE
MONTH WAS 48.9 DEGREES F, WHICH IS 1.5 DEGREES ABOVE NORMAL.
THE WARMEST APRIL ON RECORD OCCURRED IN 1981 WITH AN AVERAGE MONTHLY
TEMPERATURE OF 56.4 DEGREES F. THE COLDEST APRIL ON RECORD WAS 38.8
DEGREES BACK IN 1920. ON THE 13TH AND 14TH, THE TEMPERATURE CLIMBED TO
79 DEGREES F WHICH IS THE HIGHEST TEMPERATURE OF THE MONTH. THE COLDEST
TEMPERATURE OF 26 DEGREES F OCCURRED ON THE MORNING OF THE 26TH.

TEN WARMEST APRIL`S IN DENVER WEATHER HISTORY SINCE 1872:

56.4 1981
56.3 1946
55.5 1930
55.3 1943
54.8 1992
53.8 1881
53.6 1954
53.3 2012, 1888
53.2 1948

TEN COLDEST APRIL`S IN DENVER WEATHER HISTORY SINCE 1872:

38.8 1920
40.5 1997
41.0 1983
41.1 1873
41.4 1957
41.7 2013
42.2 1945
42.3 1984
42.5 1899
42.6 1918

PRECIPITATION:

PRECIPITATION FOR THE MONTH OF APRIL AT DENVER INTERNATIONAL
AIRPORT WAS 0.98 INCHES, WHICH IS 0.73 INCHES BELOW THE NORMAL OF
1.71 INCHES. THERE WERE 10 DAYS WITH MEASURABLE PRECIPITATION DURING
THE MONTH. PRECIPITATION MEASURED 0.22 INCHES ON THE 29TH, WHICH WAS
THE GREATEST DAILY AMOUNT FOR THE MONTH. THE MONTH`S SNOWFALL TOTAL
WAS 2.5 INCHES, WHICH IS 4.3 INCHES BELOW THE NORMAL OF 6.8 INCHES.

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

8.42 INCHES 1900
5.86 INCHES 1999
4.95 INCHES 1905
4.94 INCHES 1885
4.13 INCHES 1957
4.09 INCHES 1933
4.07 INCHES 1935
4.01 INCHES 1942
3.95 INCHES 1967
3.75 INCHES 1914

TEN DRIEST APRIL`S IN DENVER WEATHER HISTORY SINCE 1872:

0.03 INCHES 1963
0.05 INCHES 1878
0.23 INCHES 2002
0.31 INCHES 1880
0.32 INCHES 2008
0.33 INCHES 1996
0.34 INCHES 1982
0.39 INCHES 1908
0.40 INCHES 1925
0.48 INCHES 1955

TEN SNOWIEST APRIL`S IN DENVER WEATHER HISTORY SINCE 1872:

33.8 INCHES 1933
32.0 INCHES 1885
28.3 INCHES 1920
28.2 INCHES 1954
25.5 INCHES 1957
25.4 INCHES 1909
25.0 INCHES 1907
24.8 INCHES 1973
23.3 INCHES 1935
20.4 INCHES 2013

THIRTEEN LEAST SNOWIEST APRIL`S IN DENVER WEATHER HISTORY SINCE 1872:

0.0 INCHES 1995, 1982, 1943, 1930
TRACE      2002, 1969, 1946, 1925, 1915, 1910, 1889, 1888, 1887

THERE WERE 3 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. THE PEAK
WIND GUST OF 56 MPH FROM THE NORTHWEST OCCURRED ON THE 9TH.

$$



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