Climatological Report (Monthly)
Issued by NWS Sterling, VA

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CXUS51 KLWX 040231
CLMIAD

CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1031 PM EDT SUN JUN 3 2018

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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF MAY 2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1960 TO 2018

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            90   05/12        89       1
                        05/04
                        05/03
LOWEST             39   05/01        35       4
AVG. MAXIMUM     80.2              75.1     5.1     72.5
AVG. MINIMUM     59.0              51.2     7.8     52.3
MEAN             69.6              63.2     6.4
DAYS MAX >= 90      3               1.1     1.9
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           8.92              4.55    4.37     8.49
DAILY AVG.       0.29              0.15    0.14
DAYS >= .01        15              12.2     2.8
DAYS >= .10        10               7.5     2.5
DAYS >= .50         7               3.2     3.8
DAYS >= 1.00        2               1.0     1.0
GREATEST
 24 HR. TOTAL    2.35   05/31 TO 05/31

DEGREE_DAYS
HEATING TOTAL      21               130    -109      140
 SINCE 7/1       4561              4702    -141     3852
COOLING TOTAL     172                72     100       68
 SINCE 1/1        192                92     100      137
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              6.4
HIGHEST WIND SPEED/DIRECTION    46/300    DATE  05/14
HIGHEST GUST SPEED/DIRECTION    58/300    DATE  05/14

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.70
NUMBER OF DAYS FAIR            7
NUMBER OF DAYS PC              6
NUMBER OF DAYS CLOUDY         18

AVERAGE RH (PERCENT)     75

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

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

&&

WASHINGTON DULLES INTERNATIONAL AIRPORT...

...2ND WARMEST MAY ON RECORD AT DULLES...
...4TH WETTEST MAY ON RECORD AT DULLES...

THE MONTHLY AVERAGE TEMPERATURE WAS WELL ABOVE NORMAL AND RANKS AS
THE SECOND WARMEST ON RECORD. IT WAS THE WARMEST MAY SINCE 2004 WHEN
THE TEMPERATURE AVERAGE 69.8 DEGREES.

MONTHLY PRECIPITATION WAS 204 PERCENT OF NORMAL AND RANKS AS THE 4TH
WETTEST ON RECORD. IT WAS THE WETTEST MAY SINCE 2009 WHEN 10.26
INCHES OF PRECIPITATION FELL.

A DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 88 DEGREES WAS SET ON MAY
2ND. THIS TIED THE RECORD PREVIOUSLY SET IN 2010.

A DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 90 DEGREES WAS SET ON MAY
4TH. THIS TIED THE RECORD PREVIOUSLY SET IN 2001.

A DAILY RECORD HIGH MINIMUM TEMPERATURE OF 64 DEGREES WAS ALSO SET
ON MAY 4TH. THIS BROKE THE OLD RECORD OF 60 DEGREES SET IN 2012.

A DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 90 DEGREES WAS SET ON
MAY 12TH. THIS BROKE THE OLD RECORD OF 89 DEGREES SET IN 1991.

A DAILY RECORD PRECIPITATION TOTAL OF 1.87 INCHES WAS SET ON MAY
14TH. THIS BROKE THE OLD RECORD OF 1.31 INCHES SET IN 2005.

A DAILY RECORD HIGH MINIMUM TEMPERATURE OF 67 DEGREES WAS SET ON MAY
20TH. THIS TIED THE RECORD PREVIOUSLY SET IN 1969.

A DAILY RECORD HIGH MINIMUM TEMPERATURE OF 71 DEGREES WAS SET ON MAY
26TH. THIS BROKE THE OLD RECORD OF 70 DEGREES SET IN 1991.

A DAILY RECORD PRECIPITATION TOTAL OF 2.35 INCHES WAS SET ON MAY
31ST. THIS BROKE THE OLD RECORD OF 1.15 INCHES SET IN 1979.

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).

$$


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