042
CDUS41 KLWX 180647
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
247 AM EDT MON MAY 18 2026
...............................
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 17 2026
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1960 TO 2026
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
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TEMPERATURE (F)
YESTERDAY
MAXIMUM 88 5:15 PM 93 1960 75 13 86
MINIMUM 57 5:15 AM 30 1984 53 4 65
AVERAGE 73 64 9 76
PRECIPITATION (IN)
YESTERDAY 0.01 1.22 1970 0.16 -0.15 0.01
MONTH TO DATE 0.87 2.53 -1.66 3.34
SINCE MAR 1 5.39 9.50 -4.11 6.77
SINCE JAN 1 11.19 15.05 -3.86 11.19
SNOWFALL (IN)
YESTERDAY 0.0 MM MM 0.0 0.0 0.0
MONTH TO DATE 0.0 0.0 0.0 0.0
SINCE MAR 1 1.0 4.0 -3.0 0.0
SINCE JUL 1 13.6 21.0 -7.4 15.5
SNOW DEPTH 0
DEGREE DAYS
HEATING
YESTERDAY 0 4 -4 0
MONTH TO DATE 93 81 12 20
SINCE MAR 1 743 1048 -305 711
SINCE JUL 1 4372 4558 -186 4033
COOLING
YESTERDAY 8 3 5 11
MONTH TO DATE 16 32 -16 63
SINCE MAR 1 102 54 48 110
SINCE JAN 1 102 54 48 110
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WIND (MPH)
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION NW (310)
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION W (290)
AVERAGE WIND SPEED 4.6
SKY COVER
AVERAGE SKY COVER 0.5
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 2:00 AM
LOWEST 40 3:00 PM
AVERAGE 67
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THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 75 91 1987
MINIMUM TEMPERATURE (F) 54 33 1973
SUNRISE AND SUNSET
MAY 18 2026...........SUNRISE 5:55 AM EDT SUNSET 8:18 PM EDT
MAY 19 2026...........SUNRISE 5:54 AM EDT SUNSET 8:19 PM EDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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