Climatological Report (Monthly)
Issued by NWS Sterling, VA

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CXUS51 KLWX 011537
CLMIAD

CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1137 AM EDT WED JUN 1 2016

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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF MAY 2016...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1962 TO 2016

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
RECORD
 HIGH              97   05/29/1969
 LOW               28   05/07/1970
HIGHEST            89   05/28        89       0
                        05/27
                        05/26
LOWEST             36   05/16        35       1
AVG. MAXIMUM     71.1              75.1    -4.0     80.3
AVG. MINIMUM     52.8              51.2     1.6     57.5
MEAN             61.9              63.2    -1.3
DAYS MAX >= 90      0               1.1    -1.1
DAYS MAX <= 32      0               0.0     0.0
DAYS MIN <= 32      0               0.2    -0.2
DAYS MIN <= 0       0               0.0     0.0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        10.26   2009
                        1988
 MINIMUM         0.34   2007
TOTALS           6.08              4.55    1.53     2.46
DAILY AVG.       0.20              0.15    0.05
DAYS >= .01        18              12.2     5.8
DAYS >= .10        11               7.5     3.5
DAYS >= .50         6               3.2     2.8
DAYS >= 1.00        1               1.0     0.0
GREATEST
 24 HR. TOTAL    1.48   05/02 TO 05/03

DEGREE_DAYS
HEATING TOTAL     164               130      34       49
 SINCE 7/1       4036              4702    -666     5115
COOLING TOTAL      75                72       3      179
 SINCE 1/1         98                92       6      182
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              6.3
HIGHEST WIND SPEED/DIRECTION    33/310    DATE  05/14
HIGHEST GUST SPEED/DIRECTION    43/320    DATE  05/14

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.70
NUMBER OF DAYS FAIR            2
NUMBER OF DAYS PC             13
NUMBER OF DAYS CLOUDY         16

AVERAGE RH (PERCENT)     73

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              4     MIXED PRECIP               0
HEAVY RAIN                3     RAIN                       7
LIGHT RAIN               21     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      19     FOG W/VIS <= 1/4 MILE      3
HAZE                      4

-  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 ABOVE NORMAL...AND RANKED AS THE 9TH HIGHEST
ON RECORD.

THERE WERE 22 DAYS WHERE RAINFALL WAS OBSERVED...INCLUDING 18 WITH
MEASURABLE RAIN AND 14 CONSECUTIVE DAYS WITH ANY RAIN TO START THE
MONTH. PRELIMINARILY...THIS WOULD TIE FOR 3RD MOST DAYS WITH ANY
RAIN AS WELL AS 3RD MOST DAYS WITH MEASURABLE RAIN DURING MAY.

A STRETCH OF 19 CONSECUTIVE DAYS WITH ANY RAIN INCLUDING TRACE
AMOUNTS WAS OBSERVED FROM APRIL 26TH THROUGH MAY 14TH. THIS IS THE
LONGEST SUCH STRETCH ON RECORD...BREAKING THE OLD MARK OF 13 DAYS
SET IN 1989 AND 1972. PRECIPITATION RECORDS AT DULLES INTERNATIONAL
AIRPORT DATE BACK INTO THE EARLY 1960S.

A TOTAL OF 11 DAYS LAST MONTH HAD A HIGH TEMPERATURE BELOW 65
DEGREES. THIS TIES FOR THE 3RD MOST ON RECORD.

ALL CLIMATE DATA ARE CONSIDERED PRELIMINARY UNTIL REVIEWED BY THE
NATIONAL CENTER FOR ENVIRONMENTAL INFORMATION.

$$

DH/SMZ



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