Climatological Report (Monthly)
Issued by NWS Sterling, VA

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CXUS51 KLWX 022343
CLMIAD

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

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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF APRIL 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1962 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
RECORD
 HIGH              93   04/06/2010
                        04/17/2002
 LOW               17   04/01/1969
HIGHEST            89   04/29        85       4
LOWEST             29   04/08        25       4
AVG. MAXIMUM     72.1              66.7     5.4     65.9
AVG. MINIMUM     49.9              42.1     7.8     42.3
MEAN             61.0              54.4     6.6
DAYS MAX >= 90      0               0.3    -0.3
DAYS MAX <= 32      0               0.0     0.0
DAYS MIN <= 32      2               3.9    -1.9
DAYS MIN <= 0       0               0.0     0.0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         7.41   2014
 MINIMUM         0.33   1985
TOTALS           3.04              3.47   -0.43     1.88
DAILY AVG.       0.10              0.12   -0.02
DAYS >= .01        10              10.7    -0.7
DAYS >= .10         6               6.8    -0.8
DAYS >= .50         2               2.0     0.0
DAYS >= 1.00        1               0.8     0.2
GREATEST
 24 HR. TOTAL    1.57   04/06 TO 04/06

SNOWFALL (INCHES)
RECORDS
 TOTAL            4.0   1990
TOTALS              T               0.3    -0.3
SINCE 7/1         7.3              22.0   -14.7
SNOWDEPTH AVG.      0
DAYS >= TRACE       1               0.3     0.7
DAYS >= 1.0         0               0.1    -0.1
GREATEST
 SNOW DEPTH         0   MM
 24 HR TOTAL        T

DEGREE_DAYS
HEATING TOTAL     179               335    -156      335
 SINCE 7/1       3712              4572    -860     3872
COOLING TOTAL      67                17      50       18
 SINCE 1/1         69                20      49       23
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              8.0
HIGHEST WIND SPEED/DIRECTION    37/260    DATE  04/06
HIGHEST GUST SPEED/DIRECTION    57/220    DATE  04/06

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            3
NUMBER OF DAYS PC             16
NUMBER OF DAYS CLOUDY         11

AVERAGE RH (PERCENT)     63

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              4     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       4
LIGHT RAIN               16     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       1
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      13     FOG W/VIS <= 1/4 MILE      1
HAZE                      1

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

&&

WASHINGTON DULLES INTERNATIONAL AIRPORT...

THE MONTHLY AVERAGE TEMPERATURE RANKED AS THE WARMEST ON RECORD FOR
THE MONTH OF APRIL. THE PREVIOUS WARMEST WAS 60.1 DEGREES IN
1994. MONTHLY PRECIPITATION WAS SLIGHTLY BELOW NORMAL.

THE MONTHLY AVERAGE LOW TEMPERATURE WAS 49.9 DEGREES. THIS RANKS AS
THE WARMEST ON RECORD...BREAKING THE PREVIOUS RECORD OF 46.4 SET IN
1994.

A RECORD DAILY HIGH TEMPERATURE OF 89 DEGREES WAS SET ON THE 29TH.
THIS BROKE THE OLD RECORD OF 87 SET IN 1996.

FIVE RECORD DAILY WARM LOW TEMPERATURES WERE SET LAST MONTH:
A LOW OF 59 DEGREES ON THE 12TH BROKE THE RECORD OF 58 SET IN 1965
A LOW OF 63 DEGREES ON THE 16TH BROKE THE RECORD OF 57 SET IN 1973
A LOW OF 61 DEGREES ON THE 21ST BROKE THE RECORD OF 57 SET IN 2008
A LOW OF 65 DEGREES ON THE 29TH BROKE THE RECORD OF 62 SET IN 1996
A LOW OF 66 DEGREES ON THE 30TH BROKE THE RECORD OF 64 SET IN 1983

A RECORD DAILY MAXIMUM RAINFALL OF 1.57 INCHES WAS SET ON THE 6TH.
THIS BROKE THE OLD RECORD OF 1.26 SET IN 1971.

CLIMATE RECORDS AT WASHINGTON DULLES INTERNATIONAL AIRPORT BEGAN IN
1960.

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

$$

DH/RCM


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