Climatological Report (Monthly)
Issued by NWS Sterling, VA

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000
CXUS51 KLWX 022339
CLMDCA

CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
739 PM EDT TUE MAY 02 2017

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

...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR THE MONTH OF APRIL 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              95   04/17/2002
                        04/18/1976
                        04/23/1960
 LOW               15   04/01/1923
HIGHEST            91   04/29        86       5
LOWEST             39   04/08        33       6
AVG. MAXIMUM     72.9              66.6     6.3     67.0
AVG. MINIMUM     54.7              47.0     7.7     46.7
MEAN             63.8              56.8     7.0
DAYS MAX >= 90      1               0.3     0.7
DAYS MAX <= 32      0               0.0     0.0
DAYS MIN <= 32      0               0.5    -0.5
DAYS MIN <= 0       0               0.0     0.0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         9.13   1889
 MINIMUM         0.03   1985
TOTALS           2.62              3.06   -0.44     2.05
DAILY AVG.       0.09              0.10   -0.01
DAYS >= .01        10              10.4    -0.4
DAYS >= .10         6               6.5    -0.5
DAYS >= .50         1               2.2    -1.2
DAYS >= 1.00        1               0.6     0.4
GREATEST
 24 HR. TOTAL    1.57   04/06 TO 04/06

SNOWFALL (INCHES)
RECORDS
 TOTAL            5.5   1924
TOTALS            0.0                 T     0.0
SINCE 7/1         3.4              15.4   -12.0
SNOWDEPTH AVG.      0
DAYS >= TRACE       0               0.1    -0.1
DAYS >= 1.0         0               0.0     0.0
GREATEST
 SNOW DEPTH         0   MM
 24 HR TOTAL      0.0

DEGREE_DAYS
HEATING TOTAL     123               270    -147      269
 SINCE 7/1       3047              3946    -899     3221
COOLING TOTAL      94                24      70       33
 SINCE 1/1        100                26      74       36
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              9.3
HIGHEST WIND SPEED/DIRECTION    35/260    DATE  04/06
HIGHEST GUST SPEED/DIRECTION    50/260    DATE  04/06

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.70
NUMBER OF DAYS FAIR            2
NUMBER OF DAYS PC             15
NUMBER OF DAYS CLOUDY         13

AVERAGE RH (PERCENT)     64

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              5     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       4
LIGHT RAIN               15     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      11     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 RANKED AS THE WARMEST ON RECORD FOR
THE MONTH OF APRIL. THE PREVIOUS WARMEST WAS 62.0 DEGREES IN
1994 AND 1981. MONTHLY PRECIPITATION WAS SLIGHTLY BELOW NORMAL.

THE MONTHLY AVERAGE HIGH TEMPERATURE WAS 72.9 DEGREES. THIS RANKS AS
THE WARMEST ON RECORD...BREAKING THE PREVIOUS RECORD OF 72.8 SET IN
1994...1985 AND 1960.

THE MONTHLY AVERAGE LOW TEMPERATURE WAS 54.7 DEGREES. THIS ALSO
RANKS AS THE WARMEST ON RECORD...BREAKING THE PREVIOUS RECORD OF
51.9 SET IN 1981.

A RECORD DAILY HIGH TEMPERATURE OF 91 DEGREES WAS SET ON THE 29TH.
THIS TIED THE RECORD PREVIOUSLY SET IN 1974.

THREE RECORD DAILY WARM LOW TEMPERATURES WERE SET LAST MONTH:
A LOW OF 65 DEGREES ON THE 16TH TIED THE RECORD SET IN 2002
A LOW OF 64 DEGREES ON THE 21ST TIED THE RECORD SET IN 1896
A LOW OF 70 DEGREES ON THE 29TH BROKE THE RECORD OF 68 SET IN 1956

THE LOW TEMPERATURE OF 70 DEGREES ON THE 29TH WAS ALSO THE WARMEST
LOW TEMPERATURE ON RECORD FOR APRIL.

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).

$$

DH/RCM



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