Climatological Report (Monthly)
Issued by NWS Sterling, VA
Issued by NWS Sterling, VA
213
CXUS51 KLWX 011016
CLMIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
616 AM EDT WED OCT 01 2025
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...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2025...
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1960 TO 2025
WEATHER OBSERVED NORMAL DEPART LAST YEAR`S
VALUE DATE(S) VALUE FROM VALUE
NORMAL
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TEMPERATURE (F)
RECORD
HIGH 100 09/06/2023
LOW 30 09/24/1974
HIGHEST 94 09/06 91 3 86
LOWEST 46 09/09 39 7 43
AVG. MAXIMUM 81.4 79.3 2.1 78.1
AVG. MINIMUM 59.0 57.9 1.1 59.7
MEAN 70.2 68.6 1.6 68.9
DAYS MAX >= 90 2 3.1 -1.1 0
DAYS MAX <= 32 0 0.0 0.0 0
DAYS MIN <= 32 0 0.0 0.0 0
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 11.26 1975
MINIMUM 0.15 2005
TOTALS 1.22 3.94 -2.72 3.27
DAILY AVG. 0.04 0.13 -0.09 0.11
DAYS >= .01 7 9.0 -2.0 11
DAYS >= .10 4 5.9 -1.9 6
DAYS >= .50 1 2.5 -1.5 2
DAYS >= 1.00 0 1.2 -1.2 1
GREATEST
24 HR. TOTAL 0.84 09/16 TO 09/17 1.70
STORM TOTAL 0.69 1.69
(MM/DD(HH))
SNOWFALL (INCHES)
RECORDS
TOTAL MM 2023
TOTALS 0.0 0.0 0.0 0.0
SINCE 7/1 0.0 0.0 0.0 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 7 45 -38 12
SINCE 7/1 9 44 -35 MM
COOLING TOTAL 170 152 18 137
SINCE 1/1 1318 1208 110 MM
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WIND (MPH)
AVERAGE WIND SPEED 5.8
HIGHEST WIND SPEED/DIRECTION 22/310
22/050
HIGHEST GUST SPEED/DIRECTION 32/060
SKY COVER
AVERAGE SKY COVER 0.58
AVERAGE RH (PERCENT) 69
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 0 MIXED PRECIP 0
HEAVY RAIN 1 RAIN 2
LIGHT RAIN 12 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 12 FOG W/VIS <= 1/4 MILE 0
HAZE 5
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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