Climatological Report (Monthly)
Issued by NWS Sterling, VA

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000
CXUS51 KLWX 041857
CLMIAD

CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
258 PM EDT THU SEP 4 2014

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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF AUGUST 2014...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1962 TO 2014

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            90   08/31        95      -5
LOWEST             53   08/29        50       3
                        08/15
                        08/14
AVG. MAXIMUM     82.0              86.6    -4.6     83.1
AVG. MINIMUM     61.7              64.2    -2.5     64.2
MEAN             71.8              75.4    -3.6
DAYS MAX >= 90      1               8.9    -7.9
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           5.15              3.53    1.62     1.95
DAILY AVG.       0.17              0.11    0.06
DAYS >= .01        10               9.4     0.6
DAYS >= .10         7               5.6     1.4
DAYS >= .50         4               2.1     1.9
DAYS >= 1.00        2               1.0     1.0
GREATEST
 24 HR. TOTAL    1.80   08/20 TO 08/21

DEGREE_DAYS
HEATING TOTAL       0                 2      -2        0
 SINCE 7/1          3                 2       1        0
COOLING TOTAL     219               324    -105      277
 SINCE 1/1        833              1016    -183     1091
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              4.6
HIGHEST WIND SPEED/DIRECTION    31/350    DATE  08/21
HIGHEST GUST SPEED/DIRECTION    47/100    DATE  08/21

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            5
NUMBER OF DAYS PC             13
NUMBER OF DAYS CLOUDY         13

AVERAGE RH (PERCENT)     72

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              4     MIXED PRECIP               0
HEAVY RAIN                6     RAIN                       5
LIGHT RAIN               12     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      15     FOG W/VIS <= 1/4 MILE      1
HAZE                      4

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

&&

THE AVERAGE MONTHLY TEMPERATURE AT DULLES AIRPORT THIS AUGUST 2014
WAS WELL BELOW NORMAL. MONTHLY RAINFALL WAS WELL ABOVE NORMAL.

THERE WAS ONLY 1 DAY THIS MONTH...THE 31ST...WHERE THE MAXIMUM
TEMPERATURE REACHED OR EXCEEDED 90 DEGREES. THE LAST TIME THERE WAS
ONLY 1 DAY IN AUGUST WHERE THE MAXIMUM TEMPERATURE REACHED OR
EXCEEDED 90 DEGREES WAS IN 2000.

A RECORD DAILY MAXIMUM RAINFALL OF 1.43 INCHES WAS SET ON THE
21ST...BREAKING THE OLD RECORD OF 1.42 INCHES SET IN 1973. THIS WAS
ALSO THE WETTEST AUGUST DAY SINCE 2010 WHEN 1.66 INCHES FELL ON THE
12TH.

WITH 5.15 INCHES OF RAIN...THIS MONTH WAS THE WETTEST AUGUST IN 11
YEARS...SINCE 2003 WHEN 5.55 INCHES OF RAINFALL WAS OBSERVED.

$$

DFH/KLW/CS





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