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

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CXUS55 KBOU 011253
CLMDEN

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOULDER, CO
645 AM MDT MON JUN 1 2015

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

...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF MAY 2015...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2015

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              95   05/26/1942
 LOW               19   05/02/2013
                        05/03/1907
HIGHEST            85   05/31                         87  05/28
                                                          05/29
LOWEST             27   05/10                         30  05/12
                        05/09
AVG. MAXIMUM     63.3              71.5    -8.2     70.6
AVG. MINIMUM     42.7              42.7     0.0     44.5
MEAN             53.0              57.1    -4.1     57.5
DAYS MAX >= 90      0               0.8    -0.8        0
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      3               1.9     1.1        4
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         8.57   1876
 MINIMUM         0.06   1974
TOTALS           3.76              2.12    1.64     3.51
DAILY AVG.       0.12              0.07    0.05     0.11
DAYS >= .01        19               9.4     9.6       13
DAYS >= .10        10               4.8     5.2        6
DAYS >= .50         2               1.2     0.8        3
DAYS >= 1.00        1               0.2     0.8        1
GREATEST
 24 HR. TOTAL    1.18   05/08 TO 05/09           05/20 TO 05/21

SNOWFALL (INCHES)
TOTAL             4.0               1.1
RECORD MAY       15.5                                      1898

DEGREE_DAYS
HEATING TOTAL     367               265     102      244
 SINCE 7/1       5572              5996    -424     5974
COOLING TOTAL       4                21     -17       21
 SINCE 1/1          4                22     -18       21

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

WIND (MPH)
AVERAGE WIND SPEED              9.3
RESULTANT WIND SPEED/DIRECTION   2/106
HIGHEST WIND SPEED/DIRECTION    45/280    DATE  05/02
HIGHEST GUST SPEED/DIRECTION    54/280    DATE  05/02

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.80
NUMBER OF DAYS FAIR            0
NUMBER OF DAYS PC             15
NUMBER OF DAYS CLOUDY         16

AVERAGE RH (PERCENT)     70

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                2     RAIN                       9
LIGHT RAIN               23     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                1     SNOW                       1
LIGHT SNOW                2     SLEET                      0
FOG                      14     FOG W/VIS <= 1/4 MILE      7
HAZE                      3

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

.....MAY 2015 WETTER AND COLDER.....

AFTER A DRY MARCH WITH MUCH ABOVE NORMAL TEMPERATURES AND LACK OF
SNOWFALL...APRIL TRENDED WETTER THAN NORMAL AND MAY 2015 CERTAINLY
FOLLOWED THROUGH WITH MOST LOCATIONS ALONG THE FRONT RANGE AND
NORTHERN COLORADO EXPERIENCING A TOP 10 PRECIPITATION MONTH. DUE TO
CONTINUOUS MOIST DISTURBANCES THROUGH THE MONTH...MAY 2015 CAME IN
MUCH COLDER THAN NORMAL WITH ABOVE NORMAL SNOWFALL. THE COLDEST OF
THE MAY STORM SYSTEMS BROUGHT 2.0 TO 6.0 INCHES OVER NORTHEAST
COLORADO WITH MOST OF IT ARRIVING ON THE 9TH AND 10TH.

ON THE TOPIC OF PRECIPITATION...A 7 TO 11 DAY STREAK OF MEASURABLE
PRECIPITATION RAN FROM THE APRIL 30TH THROUGH MAY 10TH. THE HIGHEST
AMOUNT OF PRECIPITATION LANDED IN THAT STREAK WITH DIA COLLECTING
1.08 INCHES OF PRECIPITATION ON MAY 9TH IN THE FORM OF RAIN AND
SNOW. NUMEROUS LOCATIONS IN METRO DENVER AND ALONG THE FRONT RANGE
COLLECTED FROM 3.50 INCHES TO AS MUCH 7.50 OF PRECIPITATION AT
LOCATIONS IN AND NEAR THE FOOTHILLS.

TEMPERATURES:

THE AVERAGE TEMPERATURE AT DENVER INTERNATIONAL AIRPORT FOR THE
MONTH OF MAY WAS 53.0 DEGREES F WHICH WAS 4.1 DEGREES BELOW NORMAL.
MAY OF 1934 WAS THE WARMEST MAY ON RECORD...WITH AN AVERAGE
TEMPERATURE OF 64.7 DEGREES F. THE COLDEST MAY ON RECORD WAS 48.7
DEGREES F BACK IN 1917. THE HIGHEST TEMPERATURE OF THE MONTH WAS 85
DEGREES WHICH OCCURRED ON THE 31ST. THE COLDEST TEMPERATURE OF THE
MONTH WAS 27 DEGREES ON THE MORNING OF THE 9TH AND 10TH. THE MAY
2015 AVERAGE TEMPERATURE OF 53.0 DEGREES F WAS TIED FOR 12TH
COLDEST SINCE RECORDS BEGAN IN 1872 ALONG SIDE MAY OF 1882, 1898
AND 1950.

PRECIPITATION:

PRECIPITATION FOR THE MONTH OF MAY AT DENVER INTERNATIONAL AIRPORT
WAS 3.76 INCHES...WHICH IS 1.64 INCHES ABOVE THE NORMAL OF 2.12
INCHES. THERE WERE 19 DAYS WITH MEASURABLE PRECIPITATION. ON THE
9TH...1.08 INCHES OF PRECIPITATION FELL WHICH IS THE GREATEST DAILY
AMOUNT FOR THE MONTH.

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

8.57 INCHES 1876
7.31 INCHES 1957
6.12 INCHES 1969
5.06 INCHES 1973
4.95 INCHES 1935
4.88 INCHES 1938
4.88 INCHES 1898
4.79 INCHES 2011
4.77 INCHES 1967
4.67 INCHES 1995

10 DRIEST MAY`S IN DENVER WEATHER HISTORY SINCE 1872:

0.06 INCHES 1974
0.09 INCHES 1886
0.15 INCHES 1899
0.22 INCHES 1919
0.34 INCHES 1977
0.34 INCHES 1966
0.43 INCHES 1925
0.49 INCHES 1972
0.52 INCHES 1911
0.53 INCHES 1900

SNOW:

4.0 INCHES OF SNOW WAS MEASURED AT DENVER INTERNATIONAL AIRPORT
DURING THE MONTH...WHICH IS 2.9 INCHES ABOVE THE NORMAL OF 1.1
INCHES. 3.5 INCHES OF SNOW WAS MEASURED AT DENVER INTERNATIONAL
AIRPORT ON THE 9TH...WHICH IS THE GREATEST DAILY SNOWFALL FOR THE
MONTH.

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

15.5 INCHES 1898
13.7 INCHES 1950
13.5 INCHES 1978
13.2 INCHES 1912
12.0 INCHES 1917
10.0 INCHES 1908
 9.0 INCHES 1907
 8.9 INCHES 1893
 8.8 INCHES 1957
 8.3 INCHES 1944

LEAST MONTHLY MAY SNOWFALL AMOUNTS
IN DENVER WEATHER HISTORY SINCE 1872:

THERE HAVE BEEN 41 YEARS WITH NO SNOWFALL IN DENVER.

THERE WERE 16 DAYS IN WHICH THUNDER WAS OBSERVED AT DENVER
INTERNATIONAL AND NO HAIL WAS REPORTED. A FUNNEL CLOUD WAS OBSERVED
FROM THE DIA TOWER ON THE EVENING ON THE 7TH. IT WAS REPORTED TO BE
11 MILES NORTHWEST OF THE AIRPORT AND LASTED FOR 9 MINUTES BEFORE
DISSIPATING. THERE WERE 7 DAYS WITH DENSE FOG WITH A VISIBILITY AT
OR BELOW 1/4 MILE DURING THE MONTH. A PEAK WIND OF 54 MPH FROM A
WESTERLY DIRECTION WAS RECORDED ON THE 2ND.

$$



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