Climatological Report (Monthly)
Issued by NWS Sterling, VA

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CXUS51 KLWX 020206
CLMDCA

CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1006 PM EDT TUE AUG 1 2017

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

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

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1871 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
RECORD
 HIGH             106   07/20/1930
 LOW               52   07/04/1933
                        07/04/1907
                        07/31/1895
HIGHEST            98   07/20        97       1
LOWEST             63   07/30        61       2
AVG. MAXIMUM     90.0              88.4     1.6     91.2
AVG. MINIMUM     73.4              71.1     2.3     74.3
MEAN             81.7              79.8     1.9
DAYS MAX >= 90     20              12.4     7.6
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        11.06   1945
 MINIMUM         0.82   1872
TOTALS           9.15              3.73    5.42     3.13
DAILY AVG.       0.30              0.12    0.18
DAYS >= .01        10              10.3    -0.3
DAYS >= .10         8               6.3     1.7
DAYS >= .50         7               3.0     4.0
DAYS >= 1.00        2               1.0     1.0
GREATEST
 24 HR. TOTAL    3.31   07/28 TO 07/28

DEGREE_DAYS
HEATING TOTAL       0                 0       0        0
 SINCE 7/1          0                 0       0        0
COOLING TOTAL     523               457      66      557
 SINCE 1/1       1098               905     193     1030
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              7.7
HIGHEST WIND SPEED/DIRECTION    38/340    DATE  07/22
HIGHEST GUST SPEED/DIRECTION    48/340    DATE  07/22

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.70
NUMBER OF DAYS FAIR            2
NUMBER OF DAYS PC             19
NUMBER OF DAYS CLOUDY         10

AVERAGE RH (PERCENT)     68

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM             11     MIXED PRECIP               0
HEAVY RAIN                8     RAIN                       5
LIGHT RAIN               14     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       9     FOG W/VIS <= 1/4 MILE      0
HAZE                      3

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

&&

WASHINGTON DC...RONALD REAGAN WASHINGTON NATIONAL AIRPORT...

THE MONTHLY AVERAGE TEMPERATURE WAS ABOVE NORMAL. MONTHLY
PRECIPITATION WAS WELL ABOVE NORMAL...AND RANKED AS THE 7TH WETTEST
JULY ON RECORD.

IT WAS THE WETTEST JULY IN THE WASHINGTON DC AREA SINCE 1969.

A RECORD DAILY MAXIMUM RAINFALL OF 3.31 INCHES WAS SET ON THE 28TH.
THIS BROKE THE PREVIOUS RECORD OF 2.90 SET IN 1951.

THIS WAS ONLY THE SECOND DAILY PRECIPITATION RECORD SET IN JULY IN THE
WASHINGTON DC AREA SINCE 1978.

TWO RECORDS DAILY WARM LOW TEMPERATURES WERE SET THIS JULY:
A LOW OF 77 DEGREES ON THE 12TH TIED THE RECORD SET IN 2011
A LOW OF 79 DEGREES ON THE 13TH BROKE THE RECORD SET IN 1993

CLIMATE RECORDS HAVE BEEN KEPT AT RONALD REAGAN WASHINGTON NATIONAL
AIRPORT SINCE AUGUST OF 1941. ADDITIONAL TEMPERATURE RECORDS FOR THE
WASHINGTON DC AREA OBSERVED DOWNTOWN EXTEND BACK TO JANUARY OF 1872.
PRECIPITATION RECORDS EXTEND BACK TO JANUARY OF 1871. SNOWFALL
RECORDS BEGAN IN JANUARY OF 1884.

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

$$

DFH/RCM/SZ


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