Records for Sterling-Dulles Airport Area, Virginia (IADthr) on 09-21
Record Highs
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1: 92°F (1998)
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2: 92°F (1965)
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3: 91°F (1989)
Record Lows
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1: 33°F (1962)
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2: 41°F (2020)
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3: 42°F (1991)
Lowest Highs
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1: 70°F (1989)
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2: 70°F (1965)
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3: 68°F (2018)
Highest Lows
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1: 62°F (1973)
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2: 62°F (1972)
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3: 62°F (1966)
Highest September temperature:
99°F on 09-02-1980.
Lowest September temperature:
30°F on 09-24-1974.
Average temperature is 66.6°F
Average high is 77.3°F
Average low is 55.9°F
Temperature data from 1960 to 2022.
Record Precipitation
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1: 2.59" (1979)
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2: 1.40" (1999)
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3: 1.30" (2013)
Precipitation data from 1960 to 2022.