Climatological Report (Monthly)
Issued by NWS Sterling, VA
Issued by NWS Sterling, VA
576
CXUS51 KLWX 010820
CLMIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
420 AM EDT FRI AUG 01 2025
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...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF JULY 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 105 07/22/2011
LOW 41 07/01/1988
HIGHEST 97 07/25 96 1 101
LOWEST 60 07/05 52 8 58
AVG. MAXIMUM 90.2 87.6 2.6 91.6
AVG. MINIMUM 70.1 66.8 3.3 70.1
MEAN 80.1 77.2 2.9 80.8
DAYS MAX >= 90 18 12.5 5.5 18
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 11.21 2018
MINIMUM 0.94 1983
TOTALS 2.94 4.15 -1.21 2.66
DAILY AVG. 0.09 0.13 -0.04 0.09
DAYS >= .01 15 11.0 4.0 9
DAYS >= .10 8 6.7 1.3 7
DAYS >= .50 1 2.7 -1.7 2
DAYS >= 1.00 0 1.3 -1.3 0
GREATEST
24 HR. TOTAL 0.81 07/26 TO 07/27 0.68
STORM TOTAL 0.80 0.68
(MM/DD(HH))
SNOWFALL (INCHES)
RECORDS
TOTAL MM MM
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 0 0 0 0
SINCE 7/1 0 0 0 MM
COOLING TOTAL 477 378 99 499
SINCE 1/1 916 722 194 MM
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WIND (MPH)
AVERAGE WIND SPEED 5.0
HIGHEST WIND SPEED/DIRECTION 26/360
HIGHEST GUST SPEED/DIRECTION 38/360
SKY COVER
AVERAGE SKY COVER 0.60
AVERAGE RH (PERCENT) 75
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 15 MIXED PRECIP 0
HEAVY RAIN 4 RAIN 6
LIGHT RAIN 20 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 17 FOG W/VIS <= 1/4 MILE 0
HAZE 1
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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