205
CXUS55 KBOU 051333
CLMDEN
DENCLMDEN 000
TTAA00 KBOU 010810
CLIMATE REPORT
NATIONAL WEATHER SERVICE BOULDER, CO
126 PM MDT THU MAY 2 2013
.........APRIL 2013 COLDER AND WETTER THAN NORMAL.......
A SERIES OF STORM SYSTEMS MOVED ACROSS COLORADO DURING APRIL 2013
BRINGING BELOW NORMAL TEMPERATURES AND MUCH NEEDED PRECIPITATION TO
NORTH CENTRAL AND NORTHEASTERN COLORADO. THIS IS THE 3RD CONSECUTIVE
MONTH WITH COLDER AND WETTER WEATHER AT DENVER. THE LAST THREE MONTH
PERIOD WITH BELOW NORMAL TEMPERATURES AND ABOVE NORMAL PRECIPITATION
OCCURRED BACK IN JUNE THROUGH AUGUST OF 2009.
APRIL 2013 STARTED OUT WITH SLIGHTLY BELOW NORMAL TEMPERATURES AND LIGHT
PRECIPITATION. UPPER LEVEL HIGH PRESSURE BROUGHT ABOVE NORMAL
TEMPERATURES TO THE REGION FROM THE 4TH THROUGH THE EIGHTH...WITH
TEMPERATURES IN THE 60'S AND LOWER 70'S. THE WARM AND DRY WEATHER
WOULD NOT LAST AS A SERIES OF STRONG STORM SYSTEMS WERE POISED TO
MOVE ACROSS COLORADO. FROM THE 9TH THROUGH THE 25TH...THREE
SIGNIFICANT SNOW EVENTS WERE RECORDED AT DENVER INTERNATIONAL
AIRPORT....WITH SEVENTEEN OF EIGHTEEN DAYS DURING THIS PERIOD BEING
BELOW NORMAL.
THE FIRST STORM SYSTEM AND ASSOCIATED ARCTIC COLD FRONT MOVED
INTO THE ROCKY MOUNTAIN REGION ON THE EVENING OF THE 8TH. THIS
SYSTEM BROUGHT MUCH COLDER TEMPERATURES AND SNOW TO MUCH OF
NORTH CENTRAL AND NORTHEASTERN COLORADO. 6.6 INCHES OF SNOW FELL
AT DENVER INTERNATIONAL AIRPORT FROM THE EVENING OF THE 8TH THOUGH
THE MORNING OF THE 10TH. MAXIMUM TEMPERATURES ON THE 9TH AND 10TH
WERE ONLY IN THE LOWER 20'S...WITH LOW TEMPERATURES IN THE SINGLE
DIGITS.
ON THE 14TH...THE SECOND MAJOR STORM SYSTEM BEGAN TAKING SHAPE OVER
THE NORTHERN ROCKIES. BY THE 15TH...A LARGE UPPER TROUGH OF LOW
PRESSURE COVERED THE WESTERN TWO THIRDS OF THE UNITED STATES...WITH
A STRONG JET STREAM OVER COLORADO. UPSLOPE FLOW INCREASED ALONG AND
EAST OF THE MOUNTAINS AFTER THE PASSAGE OF A COLD FRONT. HEAVY SNOW
BANDS DEVELOPED ALONG AND NORTH OF INTERSTATE 70 DURING THE AFTERNOON
OF THE 15TH AND CONTINUED THROUGH THE NIGHT. 7.0 INCHES OF SNOW WAS
RECORDED AT DENVER INTERNATIONAL AIRPORT...WITH HEAVIER AMOUNTS WEST
AND NORTH OF DENVER. ANOTHER WEAKER STORM SYSTEM BROUGHT AN ADDITIONAL
2.0 INCHES OF SNOW TO DENVER ON THE 17TH.
THE THIRD SIGNIFICANT STORM SYSTEM BROUGHT 4.7 INCHES OF SNOW TO DENVER
INTERNATIONAL AIRPORT ON THE 22ND AND 23RD...WITH HEAVIER AMOUNTS
WEST OF DENVER.
DRIER AND MUCH WARMER WEATHER RETURNED TO NORTH CENTRAL AND NORTHEASTERN
COLORADO TOWARDS THE END OF THE MONTH...WITH TEMPERATURES IN THE 70'S TO
LOWER 80'S FROM THE 27TH THROUGH THE 29TH.
TEMPERATURES:
THE AVERAGE TEMPERATURE FOR THE MONTH OF APRIL WAS 41.7 DEGREES F
WHICH WAS 5.7 DEGREES BELOW NORMAL. THIS MAKES APRIL 2013 THE 5TH
COOLEST APRIL ON RECORD. APRIL OF 1946 AND 1981 ARE THE WARMEST
APRILS ON RECORD WITH AN AVERAGE TEMPERATURE OF 56.4 DEGREES F BOTH
OF THOSE YEARS. THE COLDEST APRIL ON RECORD WAS 38.8 BACK IN 1920.
THERE WERE NO DAYS IN WHICH THE MAXIMUM TEMPERATURE EXCEEDED 90
DEGREES. THERE WERE 4 DAYS IN WHICH THE DAYTIME HIGH TEMPERATURE DID
NOT EXCEED 32 DEGREES F AND NO DAYS WITH LOW TEMPERATURES AT OR
BELOW ZERO DEGREES F. THE HIGHEST TEMPERATURE OF THE MONTH WAS 80
DEGREES WHICH OCCURRED ON THE 29TH. THE COLDEST TEMPERATURE OF THE
MONTH WAS 6 DEGREES ON THE MORNING OF THE 10TH.
BELOW IS A LIST OF TEMPERATURE RECORDS FOR APRIL 2013:
DAILY RECORDS:
DATE TEMPERATURE TYPE OF RECORD OLD RECORD YEAR LAST SET
APRIL 9TH 22 DEGREES RECORD LOW MAX 27 DEGREES 1973
APRIL 9TH 9 DEGREES RECORD LOW 12 DEGREES 1959
APRIL 10TH 6 DEGREES RECORD LOW 7 DEGREES 1959
APRIL 16TH 22 DEGREES TIED RECORD LOW 22 DEGREES 1999
APRIL 22ND 21 DEGREES RECORD LOW 22 DEGREES 1874
PRECIPITATION:
PRECIPITATION FOR THE MONTH OF APRIL WAS 1.87 INCHES...WHICH IS 0.16
INCHES ABOVE THE NORMAL 0F 1.71 INCHES. THE WETTEST APRIL ON RECORD
OCCURRED WAY BACK IN 1900 WHEN 8.24 INCHES OF PRECIPITATION WAS
RECORDED. THE DRIEST APRIL ON RECORD OCCURRED BACK IN 1963...WHEN
ONLY 0.03 INCHES OF PRECIPITATION WAS RECORDED.
20.4 INCHES OF SNOW WAS RECORDED DURING THE MONTH...WHICH IS 13.6
INCHES ABOVE THE NORMAL OF 6.8 INCHES. APRIL 2013 JUST FELL SHORT
OF MAKING IT INTO THE TOP TEN SNOWIEST APRIL LIST.
10 SNOWIEST APRIL'S 10 LEAST SNOWIEST APRIL'S
33.8 1933 0.0 1888, 1930, 1943, 1992
32.0 1885 TRACE 1887, 1889, 1910, 1915, 1925, 1946
28.3 1920
28.2 1945
25.5 1957
25.4 1909
25.0 1907
24.8 1973
23.3 1935
21.0 1922
ONE THUNDERSTORMS WAS OBSERVED AT DENVER INTERNATIONAL
AIRPORT DURING THE MONTH. THERE WERE 5 DAYS WITH DENSE FOG WITH
A VISIBILITY AT OR BELOW 1/4 MILE DURING THE MONTH. A PEAK WIND
OF 55 MPH FROM A NORTHERLY DIRECTION WAS RECORDED ON THE 8TH.
.................................................................
......
..THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF APRIL 2013
CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2013
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 80 04/29 83 -3 88 04/24
LOWEST 6 04/10 -2 8 24 04/07
AVG. MAXIMUM 54.7 61.5 -6.8 68.6
AVG. MINIMUM 28.7 33.3 -4.6 37.9
MEAN 41.7 47.4 -5.7 53.3
DAYS MAX >= 90 0 0.0 0.0 0
DAYS MAX <= 32 4 0.3 3.7 0
DAYS MIN <= 32 17 13.0 4.0 4
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 8.24 1900
MINIMUM 0.03 1963
TOTALS 1.87 1.71 0.16 1.39
DAILY AVG. 0.06 0.06 0.00 0.05
DAYS >= .01 13 9.1 3.9 8
DAYS >= .10 7 4.5 2.5 4
DAYS >= .50 0 0.9 -0.9 0
DAYS >= 1.00 0 0.5 -0.5 0
GREATEST
24 HR. TOTAL 0.50 04/22 TO 04/23 04/26 TO 04/27
SNOWFALL (INCHES)
RECORDS
TOTAL 33.8 1933
TOTALS 20.4 6.8
DEGREE_DAYS
HEATING TOTAL 690 529 161 352
SINCE 7/1 5802 5731 71 5215
COOLING TOTAL 0 1 -1 6
SINCE 1/1 0 1 -1 6
FREEZE DATES
RECORD
EARLIEST 09/08/1962
LATEST 06/08/2007
EARLIEST 10/07
LATEST 05/05
................................................
WIND (MPH)
AVERAGE WIND SPEED 11.0
RESULTANT WIND SPEED/DIRECTION 1/016
HIGHEST WIND SPEED/DIRECTION 49/290 DATE 04/14
HIGHEST GUST SPEED/DIRECTION 55/350 DATE 04/08
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.70
NUMBER OF DAYS FAIR 2
NUMBER OF DAYS PC 20
NUMBER OF DAYS CLOUDY 8
AVERAGE RH (PERCENT) 53
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 1 MIXED PRECIP 0
HEAVY RAIN 1 RAIN 3
LIGHT RAIN 10 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 3 SNOW 6
LIGHT SNOW 8 SLEET 0
FOG 12 FOG W/VIS <= 1/4 MILE 5
HAZE 11
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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