Climatological Report (Monthly)
Issued by NWS Sterling, VA

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
000
CXUS51 KLWX 050051 RRA
CLMIAD

CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
851 PM EDT SUN JUN 4 2017

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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF MAY 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              97   05/29/1969
 LOW               28   05/07/1970
HIGHEST            92   05/17        89       3
LOWEST             36   05/09        35       1
AVG. MAXIMUM     72.5              75.1    -2.6     71.1
AVG. MINIMUM     52.3              51.2     1.1     52.8
MEAN             62.4              63.2    -0.8
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           8.49              4.55    3.94     6.08
DAILY AVG.       0.27              0.15    0.12
DAYS >= .01        17              12.2     4.8
DAYS >= .10        15               7.5     7.5
DAYS >= .50         7               3.2     3.8
DAYS >= 1.00        3               1.0     2.0
GREATEST
 24 HR. TOTAL    1.73   05/11 TO 05/11

DEGREE_DAYS
HEATING TOTAL     140               130      10      164
 SINCE 7/1       3852              4702    -850     4036
COOLING TOTAL      68                72      -4       75
 SINCE 1/1        137                92      45       98
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              7.3
HIGHEST WIND SPEED/DIRECTION    32/290    DATE  05/26
HIGHEST GUST SPEED/DIRECTION    46/250    DATE  05/31

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         14

AVERAGE RH (PERCENT)     69

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              9     MIXED PRECIP               0
HEAVY RAIN                7     RAIN                      11
LIGHT RAIN               18     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      19     FOG W/VIS <= 1/4 MILE      2
HAZE                      3

-  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 SLIGHTLY BELOW NORMAL. MONTHLY
PRECIPITATION WAS WELL ABOVE NORMAL...AND RANKED AS THE FIFTH
WETTEST MAY ON RECORD.

THIS WAS THE FIRST COOLER THAN NORMAL MONTH SINCE MAY OF 2016,
BREAKING A STREAK OF 11 CONSECUTIVE NEAR TO WARMER THAN NORMAL
MONTHS.

THE TEMPERATURE REACHED OR EXCEEDED 90 DEGREES ON THE 17TH...18TH
AND 19TH. THIS WAS THE FIRST TIME SINCE THE 19TH...20TH AND 21ST IN
1996 THAT AT LEAST THREE CONSECUTIVE DAYS IN MAY REACHED OR EXCEEDED
90 DEGREES (ALTHOUGH IT DID HAPPEN IN APRIL IN 2009 ON THE
25TH...26TH AND 27TH).

TWO RECORD DAILY WARM LOW TEMPERATURES WERE SET LAST MONTH:
A LOW OF 70 DEGREES ON THE 1ST BROKE THE RECORD OF 63 SET IN 1983
A LOW OF 66 DEGREES ON THE 19TH TIED THE RECORD PREVIOUSLY SET IN
2015 AND 1969

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/BJL/HSK


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.