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Climatological Report (Monthly)
Issued by NWS Sterling, VA
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CXUS51 KLWX 011854
CLMIAD

CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
254 PM EDT THU JUN 01 2023

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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF MAY 2023...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1960 TO 2023

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           87   05/12         89      -2       94
LOWEST            39   05/05         35       4       37
AVG. MAXIMUM    74.6               75.0    -0.4     75.9
AVG. MINIMUM    49.6               53.0    -3.4     55.6
MEAN            62.1               64.0    -1.9     65.8
DAYS MAX >= 90     0                1.4    -1.4        4
DAYS MAX <= 32     0                0.0     0.0        0
DAYS MIN <= 32     0                0.2    -0.2        0
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM       10.26   2009
 MINIMUM        0.34   2007
TOTALS          1.48               4.72   -3.24     6.85
DAILY AVG.      0.05               0.15   -0.10     0.22
DAYS >= .01        8               12.7    -4.7       14
DAYS >= .10        4                8.0    -4.0       10
DAYS >= .50        0                3.6    -3.6        6
DAYS >= 1.00       0                0.9    -0.9        2
GREATEST
 24 HR. TOTAL   1.03   04/30 TO 04/30               1.57
 STORM TOTAL    0.43                                1.40
 (MM/DD(HH))

SNOWFALL (INCHES)
RECORDS
 TOTAL             T   1963
TOTALS           0.0                0.0     0.0      0.0
SINCE 7/1        0.4               21.0   -20.6       MM
DAYS >= TRACE      0                0.0     0.0        0
DAYS >= 1.0        0                0.0     0.0        0
GREATEST
 SNOW DEPTH        0                                   0

DEGREE DAYS
HEATING TOTAL    110                115      -5       83
 SINCE 7/1      3847               4593    -746       MM
COOLING TOTAL     29                 84     -55      115
 SINCE 1/1        74                106     -32       MM
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              5.7
HIGHEST WIND SPEED/DIRECTION    29/280
HIGHEST GUST SPEED/DIRECTION    44/280

SKY COVER
AVERAGE SKY COVER           0.57

AVERAGE RH (PERCENT)     62

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              2     MIXED PRECIP               0
HEAVY RAIN                2     RAIN                       5
LIGHT RAIN               11     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                      2

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

&&

MAY 2023 WAS THE FIFTH DRIEST ON RECORD AT DULLES AIRPORT WITH ONLY 1.48 INCHES
OF RAIN. IN TERMS OF TEMPERATURES, MAY 2023 WAS ALSO COOLER THAN NORMAL WITH THE
AVERAGE TEMPERATURE NEARLY TWO DEGREES BELOW NORMAL BUT NOT WITHIN THE FIRST TWENTY
COOLEST MAY ON RECORD.

$$
National Weather Service Weather Forecast Office
