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

Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
CXUS55 KBOU 021809
CLMDEN

CLIMATE REPORT
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
1208 PM MDT WED MAY 2 2018

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

...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF APRIL 2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2018

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            83   04/29                         79  04/14
                                                          04/13
LOWEST             21   04/06                         24  04/10
AVG. MAXIMUM     63.2              61.5     1.7     63.2
AVG. MINIMUM     32.5              33.3    -0.8     34.5
MEAN             47.8              47.4     0.4     48.9
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.3    -0.3        1
DAYS MIN <= 32     16              13.0     3.0       15
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         8.24   1900
 MINIMUM         0.03   1963
TOTALS           0.86              1.71   -0.85     0.98
DAILY AVG.       0.03              0.06   -0.03     0.03
DAYS >= .01         8               9.1    -1.1       10
DAYS >= .10         4               4.5    -0.5        5
DAYS >= .50         0               0.9    -0.9        0
DAYS >= 1.00        0               0.5    -0.5        0
GREATEST
 24 HR. TOTAL    0.34   04/21 TO 04/21           04/29 TO 04/29

         OBSERVED                  NORMAL  DEPART  LAST YEAR`S

SNOWFALL  (INCHES)
TOTALS             1.5              6.8

DEGREE_DAYS
HEATING TOTAL     509               529     -20     478
 SINCE 7/1       5250              5731    -481     4803
COOLING TOTAL       2                 1       1        0
SINCE 1/1           2                 1       1        0

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

WIND (MPH)
AVERAGE WIND SPEED              12.5
RESULTANT WIND SPEED/DIRECTION    M
HIGHEST WIND SPEED/DIRECTION    46/320    DATE  04/13
HIGHEST GUST SPEED/DIRECTION    70/280    DATE  04/17

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)     49

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORMS             3   MIXED PRECIP           0
HEAVY RAIN                0   RAIN                   2
LIGHT RAIN                9   FREEZING RAIN          0
LT FREEZING RAIN          0   HAIL                   0
HEAVY SNOW                0   SNOW                   2
LIGHT SNOW                8   FOG W/VIS <=1/4 MILE   1
FOG                       8   HAZE                   2

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

...APRIL 2018...DRIER THAN NORMAL WITH NEAR NORMAL TEMPERATURES...

A PERSISTENT NORTHWEST FLOW ALOFT DOMINATED COLORADO THE FIRST NINE
DAYS OF THE MONTH. THIS PATTERN RESULTED IN BREEZY CONDITIONS ACROSS
THE AREA WITH MOSTLY DRY CONDITIONS. HOWEVER, AN OCCASIONAL COLD
FRONT MOVING ACROSS THE NORTHEAST PLAINS DID BRING SOME VERY LIGHT
PRECIPITATION TO THE AREA DURING THIS PERIOD. UPPER LEVEL HIGH
PRESSURE OVER THE ROCKY MOUNTAIN REGION BROUGHT ABOVE NORMAL
TEMPERATURES FROM THE 10TH THROUGH THE 12TH WITH HIGH TEMPERATURES
IN THE 70S AND LOW 80S ON THE PLAINS.

ON THE 13TH, A POWERFUL UPPER LEVEL STORM SYSTEM AND ASSOCIATED COLD
FRONT MOVED ACROSS COLORADO, PRODUCING BLIZZARD CONDITIONS ACROSS
THE FAR NORTHEAST PLAINS. DENVER INTERNATIONAL AIRPORT EXPERIENCED
STRONG WINDS WITH THIS SYSTEM, HOWEVER MANAGED TO MISS OUT ON THE
HEAVY SNOW WITH ONLY A TRACE OF SNOWFALL MEASURED.

ON THE 17TH, A POTENT UPPER LEVEL SYSTEM MOVING ACROSS THE CENTRAL
AND NORTHERN ROCKIES PRODUCED STRONG WINDS AND BLOWING DUST ACROSS
FRONT RANGE URBAN CORRIDOR, PALMER DIVIDE AND NORTHEASTERN PLAINS.
MANY LOCATIONS HAD WIND GUSTS TO 60 MPH WITH A GUST TO 89 MPH
MEASURED AT LOUISVILLE. DENVER INTERNATIONAL AIRPORT MEASURED A GUST
OF 70 MPH.

MUCH NEEDED PRECIPITATION FELL ACROSS THE REGION FROM THE 20TH
THROUGH THE 21ST AS AN UPPER LEVEL LOW PRESSURE SYSTEM TRACKED FROM
THE FOUR CORNERS REGION ACROSS COLORADO. THE 0.34 INCHES OF
PRECIPITATION MEASURED AT DENVER INTERNATIONAL AIRPORT WAS THE
HIGHEST 24 HOUR TOTAL SO FAR THIS YEAR.

A WEAK UPPER LEVEL STORM SYSTEM AND COLD FRONT PRODUCED COLDER
TEMPERATURES ALONG WITH SOME LIGHT PRECIPITATION IN DENVER ON THE
24TH. A STRONG UPPER LEVEL RIDGE OF HIGH PRESSURE BUILT OVER THE
ROCKY MOUNTAIN REGION ON THE 27TH, RESULTING IN ABOVE NORMAL
TEMPERATURES THOUGH THE END OF THE MONTH. ON THE 29TH, THE HIGH
TEMPERATURE AT DENVER INTERNATIONAL AIRPORT REACHED 83 DEGREES WHICH
WAS THE WARMEST TEMPERATURE OF THE MONTH AND SO FAR FOR THE YEAR.

TEMPERATURES:

THE AVERAGE TEMPERATURE AT DENVER INTERNATIONAL AIRPORT FOR THE
MONTH OF WAS 47.8 DEGREES F, WHICH IS 0.4 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
OCCURRED IN 1920 WITH A MONTHLY AVERAGE OF 38.8 DEGREES.

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:

APRIL 2018 LANDED 0.85 INCHES BELOW THE MONTHLY AVERAGE COMING IN AT
0.86 INCHES. THE HIGHEST PRECIPITATION AMOUNT CAME FROM A COLD STORM SYSTEM
ON THE 20TH AND 21ST BRINGING 0.47 INCHES OF NEEDED MOISTURE.

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 1578
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

SNOWFALL

DENVER RECEIVED 1.5 INCHES OF SNOW FOR APRIL, WHICH IS 5.3 INCHES
BELOW THE 1981-2010 AVERAGE OF 6.8 INCHES. THE MAJORITY OF THAT
TOTAL CAME FROM THE COLD STORM SYSTEM SYSTEM ON THE 20TH AND 21ST
BRINGING 1.3 INCHES WHILE STARTING OUT AS RAIN AND EVENTUALLY CHANGING
OVER TO SNOW.

TEN HIGHEST SNOW TOTALS FOR APRIL IN DENVER WEATHER HISTORY

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

TEN LOWEST SNOW TOTALS FOR APRIL IN DENVER WEATHER HISTORY

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 2 DAYS OF DENSE FOG WITH A VISIBILITY AT
OR BELOW 1/4 MILE DURING THE MONTH. A PEAK WIND GUST OF 70 MPH WAS
RECORDED FROM THE WEST ON THE 17TH.

$$


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.