Climatological Report (Monthly)
Issued by NWS Sterling, VA

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000
CXUS51 KLWX 021304
CLMIAD

CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
904 AM EDT SAT AUG 2 2014

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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF JULY 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             105   07/22/2011
 LOW               41   07/01/1988
HIGHEST            95   07/02        96      -1
LOWEST             48   07/30        52      -4
AVG. MAXIMUM     84.5              87.9    -3.4     86.9
AVG. MINIMUM     63.8              65.5    -1.7     69.6
MEAN             74.2              76.7    -2.5
DAYS MAX >= 90      5              11.6    -6.6
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         7.89   2005
 MINIMUM         0.94   1983
TOTALS           2.09              3.67   -1.58     7.27
DAILY AVG.       0.07              0.12   -0.05
DAYS >= .01        10              10.8    -0.8
DAYS >= .10         7               6.5     0.5
DAYS >= .50         0               2.4    -2.4
DAYS >= 1.00        0               1.0    -1.0
GREATEST
 24 HR. TOTAL    0.42   07/09 TO 07/10
                        07/10 TO 07/10
                        07/10 TO 07/11

DEGREE_DAYS
HEATING TOTAL       3                 0       3        0
 SINCE 7/1          3                 0       3        0
COOLING TOTAL     296               363     -67      419
 SINCE 1/1        614               692     -78      814
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              6.4
HIGHEST WIND SPEED/DIRECTION    41/280    DATE  07/08
HIGHEST GUST SPEED/DIRECTION    54/280    DATE  07/08

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            5
NUMBER OF DAYS PC             16
NUMBER OF DAYS CLOUDY         10

AVERAGE RH (PERCENT)     68

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              9     MIXED PRECIP               0
HEAVY RAIN                3     RAIN                       6
LIGHT RAIN               14     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      13     FOG W/VIS <= 1/4 MILE      1
HAZE                      1

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

&&

DULLES INTERNATIONAL AIRPORT...

MONTHLY AVERAGE TEMPERATURE AND PRECIPITATION AT DULLES
INTERNATIONAL AIRPORT THIS JULY 2014 WERE BOTH BELOW NORMAL. IT WAS
THE COOLEST JULY SINCE 2001.

THREE RECORD DAILY LOW TEMPERATURES WERE SET THIS MONTH. A RECORD
DAILY LOW TEMPERATURE OF 55 DEGF ON THE 17TH TIED THE RECORD SET IN
1976. A SECOND RECORD DAILY LOW TEMPERATURE OF 52 DEGF WAS SET ON
THE 29TH...BREAKING THE OLD RECORD OF 53 DEGF SET IN 1978. A THIRD
RECORD DAILY LOW TEMPERATURE OF 48 DEGF WAS SET ON THE
30TH...BREAKING THE OLD RECORD OF 51 DEGF SET IN 1981.

THE LOW TEMPERATURE OF 48 DEGF ON THE 30TH WAS THE COOLEST JULY
TEMPERATURE OBSERVED SINCE 2002 WHEN THE TEMPERATURE DROPPED TO 47
DEGF ON THE 12TH.

DESPITE BEING A COOL MONTH OVERALL...TWO RECORD DAILY HIGH MINIMUM
TEMPERATURES WERE SET THIS MONTH. A RECORD DAILY HIGH MINIMUM
TEMPERATURE OF 71 DEGF ON THE 1ST BROKE THE OLD RECORD OF 70 DEGF
SET IN 2011. A SECOND RECORD DAILY HIGH MINIMUM TEMPERATURE OF 72
DEGF ON THE 13TH TIED THE RECORD SET IN 2006.

$$

DH








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