Climatological Report (Monthly)
Issued by NWS Sterling, VA

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CXUS51 KLWX 032325
CLMIAD

CLIMATE REPORT...UPDATED
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
725 PM EDT THU SEP 3 2015

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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF AUGUST 2015...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1962 TO 2015

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
RECORD
 HIGH             104   08/20/1983
 LOW               38   08/29/1982
HIGHEST            94   08/17        95      -1
LOWEST             53   08/14        50       3
AVG. MAXIMUM     85.4              86.6    -1.2     82.0
AVG. MINIMUM     63.8              64.2    -0.4     61.7
MEAN             74.6              75.4    -0.8
DAYS MAX >= 90      4               8.9    -4.9
DAYS MAX <= 32      0               0.0     0.0
DAYS MIN <= 32      0               0.0     0.0
DAYS MIN <= 0       0               0.0     0.0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        10.71   1984
 MINIMUM         0.44   1998
TOTALS           1.09              3.53   -2.44     5.15
DAILY AVG.       0.04              0.11   -0.07
DAYS >= .01         8               9.4    -1.4
DAYS >= .10         5               5.6    -0.6
DAYS >= .50         0               2.1    -2.1
DAYS >= 1.00        0               1.0    -1.0
GREATEST
 24 HR. TOTAL    0.57   08/19 TO 08/20

DEGREE_DAYS
HEATING TOTAL       0                 2      -2        0
 SINCE 7/1          0                 2      -2        3
COOLING TOTAL     305               324     -19      219
 SINCE 1/1       1111              1016      95      833
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              5.3
HIGHEST WIND SPEED/DIRECTION    24/340    DATE  08/04
HIGHEST GUST SPEED/DIRECTION    32/330    DATE  08/04

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR            7
NUMBER OF DAYS PC             18
NUMBER OF DAYS CLOUDY          6

AVERAGE RH (PERCENT)     68

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              4     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       3
LIGHT RAIN               10     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       5     FOG W/VIS <= 1/4 MILE      0
HAZE                      1

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

&&

DULLES INTERNATIONAL AIRPORT...

THE MONTHLY AVERAGE TEMPERATURE WAS SLIGHTLY BELOW NORMAL. MONTHLY
PRECIPITATION WAS WELL BELOW NORMAL.

FOUR DAYS LAST MONTH REACHED OR EXCEEDED 90 DEGREES...THE HIGHEST
NUMBER OF DAYS IN AUGUST SINCE 2012.

LAST MONTH MARKED THE DRIEST AUGUST SINCE 1998...AND THE FIFTH
DRIEST ON RECORD.

$$

DFH/RCM


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