Climatological Report (Monthly)
Issued by NWS Sterling, VA

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000
CXUS51 KLWX 020210
CLMIAD

CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1009 PM EDT TUE AUG 1 2017

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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF JULY 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1960 TO 2017

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            94   07/14        96      -2
                        07/13
LOWEST             57   07/31        52       5
                        07/30
AVG. MAXIMUM     87.7              87.9    -0.2     89.7
AVG. MINIMUM     67.8              65.5     2.3     69.2
MEAN             77.7              76.7     1.0
DAYS MAX >= 90     13              11.6     1.4
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           8.80R             3.67    5.13     3.02
DAILY AVG.       0.28              0.12    0.16
DAYS >= .01        12              10.8     1.2
DAYS >= .10        10               6.5     3.5
DAYS >= .50         7               2.4     4.6
DAYS >= 1.00        4               1.0     3.0
GREATEST
 24 HR. TOTAL    1.68   07/06 TO 07/06

DEGREE_DAYS
HEATING TOTAL       0                 0       0        0
 SINCE 7/1          0                 0       0        0
COOLING TOTAL     403               363      40      459
 SINCE 1/1        796               692     104      810
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              5.5
HIGHEST WIND SPEED/DIRECTION    38/290    DATE  07/01
HIGHEST GUST SPEED/DIRECTION    50/160    DATE  07/18

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            5
NUMBER OF DAYS PC             18
NUMBER OF DAYS CLOUDY          8

AVERAGE RH (PERCENT)     70

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM             14     MIXED PRECIP               0
HEAVY RAIN                8     RAIN                       7
LIGHT RAIN               15     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       1
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      14     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.

&&

WASHINGTON DULLES INTERNATIONAL AIRPORT...

THE MONTHLY AVERAGE TEMPERATURE WAS ABOVE NORMAL. MONTHLY
PRECIPITATION RANKED AS THE WETTEST JULY ON RECORD.

TWO DAILY MAXIMUM RAINFALL RECORDS WERE SET LAST MONTH:
DAILY RAINFALL OF 1.68 INCHES ON THE 6TH BROKE THE RECORD OF 0.64
SET IN 1995.
DAILY RAINFALL OF 1.66 INCHES ON THE 18TH BROKE THE RECORD OF 0.92
SET IN 1965.

A RECORD DAILY WARM LOW TEMPERATURE OF 72 DEGREES WAS SET ON THE
1ST. THIS TIED THE RECORD PREVIOUSLY SET IN 2014...1991...AND 1963.

TEMPERATURE AND PRECIPITATION RECORDS AT WASHINGTON DULLES
INTERNATIONAL AIRPORT BEGAN IN 1960. SNOWFALL RECORDS BEGAN IN 1962.

ALL CLIMATE DATA ARE CONSIDERED PRELIMINARY UNTIL REVIEWED BY THE
NATIONAL CENTERS FOR ENVIRONMENTAL INFORMATION (NCEI).

$$

DFH/RCM/SZ



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