Climatological Report (Monthly)
Issued by NWS Sterling, VA

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CXUS51 KLWX 011738 CCA
CLMIAD

CLIMATE REPORT...CORRECTED
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
138 PM EDT TUE MAY 1 2018

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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF APRIL 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              93   04/06/2010
                        04/17/2002
 LOW               17   04/01/1969
HIGHEST            86   04/13        85       1
LOWEST             29   04/20        25       4
                        04/18
                        04/08
AVG. MAXIMUM     62.8              66.7    -3.9     72.1
AVG. MINIMUM     40.4              42.1    -1.7     49.9
MEAN             51.6              54.4    -2.8
DAYS MAX >= 90      0               0.3    -0.3
DAYS MAX <= 32      0               0.0     0.0
DAYS MIN <= 32      6               3.9     2.1
DAYS MIN <= 0       0               0.0     0.0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         7.41   2014
 MINIMUM         0.33   1985
TOTALS           3.55              3.47    0.08     3.04
DAILY AVG.       0.12              0.12    0.00
DAYS >= .01        10              10.7    -0.7
DAYS >= .10         5               6.8    -1.8
DAYS >= .50         4               2.0     2.0
DAYS >= 1.00        0               0.8    -0.8
GREATEST
 24 HR. TOTAL    0.97   04/16 TO 04/16

SNOWFALL (INCHES)
RECORDS
 TOTAL            4.0   1990
TOTALS              T               0.3    -0.3
SINCE 7/1        11.9              22.0   -10.1
SNOWDEPTH AVG.      0
DAYS >= TRACE       2               0.3     1.7
DAYS >= 1.0         0               0.1    -0.1
GREATEST
 SNOW DEPTH         0   MM
 24 HR TOTAL        T

DEGREE_DAYS
HEATING TOTAL     410               335      75      179
 SINCE 7/1       4540              4572     -32     3712
COOLING TOTAL      15                17      -2       67
 SINCE 1/1         20                20       0       69
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              10.1
HIGHEST WIND SPEED/DIRECTION    40/290    DATE  04/04
HIGHEST GUST SPEED/DIRECTION    51/290    DATE  04/04

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.70
NUMBER OF DAYS FAIR            3
NUMBER OF DAYS PC             14
NUMBER OF DAYS CLOUDY         13

AVERAGE RH (PERCENT)     60

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              3     MIXED PRECIP               0
HEAVY RAIN                5     RAIN                       6
LIGHT RAIN               13     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                2     SLEET                      0
FOG                       9     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 WAS BELOW NORMAL. IT WAS THE COLDEST
APRIL SINCE 1997, WHEN THE AVERAGE TEMPERATURE WAS 50.3 DEGREES.

MONTHLY PRECIPITATION WAS 102 PERCENT OF NORMAL. IT WAS THE WETTEST
APRIL SINCE 2014, WHEN 7.41 INCHES OF PRECIPITATION FELL.

MONTHLY SNOWFALL WAS NEAR NORMAL.

A DAILY RECORD HIGH MINIMUM TEMPERATURE OF 58 DEGREES WAS SET ON
APRIL 13TH. THIS BROKE THE OLD RECORD OF 56 DEGREES SET IN 2002.

A DAILY RECORD LOW MAXIMUM TEMPERATURE OF 45 DEGREES WAS SET ON
APRIL 17TH. THIS BROKE THE OLD RECORD OF 48 DEGREES SET IN 1986.

A DAILY RECORD LOW TEMPERATURE OF 29 DEGREES WAS SET ON APRIL 18TH.
THIS BROKE THE OLD RECORD OF 30 DEGREES SET IN 2014.

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).

$$

RCM


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