Climatological Report (Monthly)
Issued by NWS Sterling, VA

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000
CXUS51 KLWX 042042
CLMDCA

CLIMATE REPORT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC

445 AM EDT THU JUN 4 2015

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

...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR THE MONTH OF MAY 2015...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1871 TO 2015

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
RECORD
 HIGH              99   05/31/1991
 LOW               33   05/11/1906
HIGHEST            92   05/31        90       2
                        05/28
                        05/18
LOWEST             51   05/02        44       7
AVG. MAXIMUM     82.7              75.4     7.3     78.0
AVG. MINIMUM     63.8              56.5     7.3     58.9
MEAN             73.2              66.0     7.2
DAYS MAX >= 90      7               1.1     5.9
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        10.69   1953
 MINIMUM         0.41   1939
TOTALS           1.92              3.99   -2.07     4.96
DAILY AVG.       0.06              0.13   -0.07
DAYS >= .01         6              11.1    -5.1
DAYS >= .10         4               7.3    -3.3
DAYS >= .50         2               2.9    -0.9
DAYS >= 1.00        0               0.9    -0.9
GREATEST
 24 HR. TOTAL    0.76   05/18 TO 05/18
                        05/17 TO 05/18
                        05/18 TO 05/18

DEGREE_DAYS
HEATING TOTAL      16                79     -63       32
 SINCE 7/1       3924              4025    -101     4121
COOLING TOTAL     278               108     170      148
 SINCE 1/1        298               134     164      169
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              8.0
HIGHEST WIND SPEED/DIRECTION    29/330    DATE  05/12
HIGHEST GUST SPEED/DIRECTION    37/300    DATE  05/12

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            3
NUMBER OF DAYS PC             19
NUMBER OF DAYS CLOUDY          9

AVERAGE RH (PERCENT)     61

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              6     MIXED PRECIP               0
HEAVY RAIN                2     RAIN                       4
LIGHT RAIN               10     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       7     FOG W/VIS <= 1/4 MILE      0
HAZE                      2

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

&&
THE MONTHLY AVERAGE TEMPERATURE WAS WELL ABOVE NORMAL. MONTHLY
PRECIPITATION WAS WELL BELOW NORMAL.

PRELIMINARY DATA INDICATES THAT MAY 2015 WAS THE WARMEST MAY ON
RECORD WITH AN AVERAGE MONTHLY TEMPERATURE OF 73.2 DEGREES. THE
PREVIOUS WARMEST MAY ON RECORD WAS MAY OF 1991 WITH A MONTHLY
AVERAGE TEMPERATURE OF 73.0 DEGREES.

EIGHT DAILY HIGH MINIMUM TEMPERATURE RECORDS WERE BROKEN THIS MONTH.

THE FIRST THREE RECORDS WERE SET ON THREE CONSECUTIVE DAYS BETWEEN
THE 10TH AND 12TH. THE FIRST RECORD OF 69 DEGREES ON THE 10TH AND
TIED THE OLD RECORD SET IN 1979. THE SECOND RECORD OF 71 DEGREES ON
THE 11TH TIED THE OLD RECORD ALSO SET IN 1979. THE THIRD RECORD OF
71 DEGREES ON THE 12TH BROKE THE OLD RECORD OF 70 SET IN 1911.

THE NEXT THREE RECORDS WERE SET ON ANOTHER STRETCH OF THREE
CONSECUTIVE DAYS BETWEEN THE 17TH AND 19TH. THE FOURTH RECORD OF 70
DEGREES ON THE 17TH BROKE THE OLD RECORD OF 69 SET IN 1974. THE
FIFTH RECORD OF 72 DEGREES ON THE 18TH BROKE THE OLD RECORD OF 68
SET IN 1995...1953...1943 AND 1900. THE SIXTH RECORD OF 72 DEGREES
ON THE 19TH BROKE THE OLD RECORD OF 70 SET IN 1986 AND 1962.

THE SEVENTH RECORD OF 75 DEGREES ON THE 27TH TIED THE OLD RECORD SET
IN 1991. FINALLY...THE EIGHTH RECORD OF 74 DEGREES ON THE 29TH TIED
THE OLD RECORD ALSO SET IN 1991.

THERE WERE 6 DAYS WITH TEMPERATURES AT OR ABOVE 90 DEGREES...THE
MOST IN THE MONTH OF MAY SINCE 1991.

$$
SMZ/DH



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