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

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CXUS55 KBOU 011616
CLMDEN

DENCLMDEN 000
TTAA00 KBOU 010844


CLIMATE REPORT
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
244 AM MDT FRI SEP 1 2017

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

...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF AUGUST 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             105   08/08/1878
 LOW               40   08/26/1910
                        08/25/1910
                        08/24/1910
HIGHEST            95   08/19       105     -10       97  08/09
LOWEST             51   08/04        40      11       47  08/25
                                                          08/20
AVG. MAXIMUM     85.7              87.2    -1.5     86.3
AVG. MINIMUM     57.3              57.9    -0.6     56.2
MEAN             71.5              72.5    -1.0     71.2
DAYS MAX >= 90     10              11.5    -1.5       15
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.0     0.0        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.85   1979
 MINIMUM         0.02   1924
TOTALS           1.86              1.69    0.17     0.22
DAILY AVG.       0.06              0.05    0.01     0.01
DAYS >= .01         6               8.6    -2.6        4
DAYS >= .10         4               4.3    -0.3        1
DAYS >= .50         2               1.2     0.8        0
DAYS >= 1.00        0               0.3    -0.3        0
GREATEST
 24 HR. TOTAL    0.90   08/07 TO 08/07           08/24 TO 08/24
                                                          08/28 TO 08/28
                                                          08/28 TO 08/28
SNOWFALL (INCHES)
RECORDS
 TOTAL             MM   MM
TOTALS            0.0               0.0

DEGREE_DAYS
HEATING TOTAL       8                10      -2       15
 SINCE 7/1          8                16      -8       15
COOLING TOTAL     216               244     -28      218
 SINCE 1/1        749               688      61      762

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

WIND (MPH)
AVERAGE WIND SPEED              9.2
RESULTANT WIND SPEED/DIRECTION   2/189
HIGHEST WIND SPEED/DIRECTION    49/320    DATE  08/04
HIGHEST GUST SPEED/DIRECTION    62/320    DATE  08/04

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR            7
NUMBER OF DAYS PC             21
NUMBER OF DAYS CLOUDY          3

AVERAGE RH (PERCENT)     50

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                3     RAIN                       4
LIGHT RAIN               12     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      10     FOG W/VIS <= 1/4 MILE      2
HAZE                      2

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

SNOWFALL (INCHES) RECORDS TOTAL             MM   MM
TOTALS            0.0               0.0

DEGREE_DAYS
HEATING TOTAL       8                10      -2       15
 SINCE 7/1          8                16      -8       15
COOLING TOTAL     216               244     -28      218
 SINCE 1/1        749               688      61      762

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

WIND (MPH)
AVERAGE WIND SPEED              9.2
RESULTANT WIND SPEED/DIRECTION   2/189
HIGHEST WIND SPEED/DIRECTION    49/320    DATE  08/04
HIGHEST GUST SPEED/DIRECTION    62/320    DATE  08/04

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR            7
NUMBER OF DAYS PC             21
NUMBER OF DAYS CLOUDY          3

AVERAGE RH (PERCENT)     50

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                3     RAIN                       4
LIGHT RAIN               12     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      10     FOG W/VIS <= 1/4 MILE      2
HAZE                      2

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

...AUGUST 2017...COOLER AND SLIGHTLY WETTER THAN NORMAL...

UPPER LEVEL HIGH PRESSSURE OVER THE ROCKY MOUNTAIN REGION BROUGHT
DRY WEATHER AND NEAR NORMAL TEMPERATURES TO NORTH CENTRAL AND
NORTHEASTERN COLORADO THE FIRST TWO DAYS OF THE MONTH. BY THE
3RD, THE UPPER RIDGE RETROGRADED WESTWARD AND WAS CENTERED OVER
NORTHERN CALIFORNIA. AT THE SAME TIME, AN UPPER LEVEL TROUGH OF LOW
PRESSURE DEEPENED OVER THE CENTRAL AND EASTERN UNITED STATES WITH
NORTHWEST FLOW ALOFT SETTING UP OVER COLORADO. THIS PATTERN ALLOWED
A STRONG COLD FRONT TO MOVE INTO NORTHEASTERN COLORADO, RESULTING
IN MUCH COOLER TEMPERATURES WITH MANY LOCATIONS ACROSS THE PLAINS
ONLY HAVING HIGH TEMPERATURES IN THE 60S. UPSLOPE FLOW BEHIND THE
FRONT ALSO RESULTED IN PRECIPITATION ACROSS THE FOOTHILLS AND
ADJACENT PLAINS. ANOTHER COOL AND WET DAY WAS THE 7TH WITH A
HIGH TEMPERATURE OF ONLY 68 DEGREES F AND 0.90 INCHES OF
PRECIPITATION MEASURED AT DENVER INTERNATIONAL AIRPORT. OCCASSIONAL
COLD FRONTS AND UPPER LEVEL DISTURBANCES CAUGHT UP IN THE NORTHWEST
FLOW ALOFT BROUGHT WETTER WEATHER AND BELOW NORMAL TEMPERATURES
ACROSS THE AREA THROUGH THE 13TH. THEN A MAJOR PATTERN SHIFT TOOK
PLACE AS AN UPPER LEVEL RIDGE DEVELOPED OVER THE ROCKY MOUNTIAN
REGION. THIS PATTERN RESULTED IN DRIER AND WARMER CONDITIONS AS
DENVER ONLY RECEIVED MEASURABLE PRECIPITATION ONCE AFTER THE 13TH.
THIS UPPER LEVEL RIDGE WAS PARTICULARLY STRONG ON THE 19TH WHEN DENVER
REACHED 95 DEGREES, THE HOTTEST DAY OF THE MONTH. AN UNUSUALLY
STAGNANT UPPER LEVEL PATTERN, WHICH HELPED TO STALL HURRICANE
HARVEY OVER TEXAS, ALLOWED DENVER TO REACH 90 DEGREES OR ABOVE ON SIX
OF THE LAST NINE DAYS OF AUGUST.

TEMPERATURES:

THE AVERAGE TEMPERATURE AT DENVER INTERNATIONAL AIRPORT FOR THE
MONTH WAS 71.5 DEGREES F, WHICH IS 1.0 DEGREES BELOW NORMAL. THE
WARMEST AUGUST ON RECORD OCCURRED IN 2011 WITH AN AVERAGE MONTHLY
TEMPERATURE OF 77.0 DEGREES F. THE COLDEST AUGUST ON RECORD WAS 66.5
DEGREES BACK IN 1915. ON THE 19TH...THE TEMPERATURE CLIMBED TO 95
DEGREES F WHICH IS THE HIGHEST TEMPERATURE RECORDED DURING THE
MONTH. THE COLDEST TEMPERATURE OF 51 DEGREES F OCCURRED ON THE
MORNING OF THE 4TH.

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

77.0 2011
76.8 1937
75.4 2007
75.3 1995
75.0 2012...1994
74.7 1938
74.6 2013...1878
74.5 2000

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

66.5 1915
66.6 1927
67.7 1920
67.8 1884
68.0 1888
68.1 1968
68.2 2004...1967
68.4 1992...1917

PRECIPITATION:

PRECIPITATION FOR THE MONTH OF AUGUST AT DENVER INTERNATIONAL AIRPORT
WAS 1.86 INCHES, WHICH IS 0.17 INCHES ABOVE THE NORMAL OF 1.69
INCHES. THERE WERE 6 DAYS WITH MEASURABLE PRECIPITATION DURING THE
MONTH. 0.90 INCHES OF PRECIPITATION FELL ON THE 7TH, WHICH IS THE
GREATEST DAILY AMOUNT FOR THE MONTH.

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

5.85 INCHES 1979
4.47 INCHES 1951
4.03 INCHES 2008
3.87 INCHES 1923
3.69 INCHES 1991
3.52 INCHES 1997
3.49 INCHES 1921
3.37 INCHES 1999
3.22 INCHES 1936
3.20 INCHES 1984

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

0.02 INCHES 1924
0.05 INCHES 1917...1900
0.06 INCHES 1960
0.11 INCHES 2012
0.16 INCHES 1974
0.19 INCHES 1948
0.22 INCHES 2016
0.23 INCHES 1907
0.25 INCHES 1959

THERE WERE 13 DAYS IN WHICH THUNDER WAS OBSERVED AT DENVER
INTERNATIONAL AIRPORT AND 2 DAYS WITH DENSE FOG WITH A VISIBILITY AT
OR BELOW 1/4 MILE DURING THE MONTH. THE PEAK WIND GUST OF 62 MPH
FROM THE NORTHWEST OCCURRED ON THE 4TH.

$$



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