Great Falls Crossing weather by month
What a typical year looks like in Great Falls Crossing, Virginia: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Washington Dulles International Airport, 12 km from Great Falls Crossing; records cover 1960–2026.
The year at a glance
- Precipitation a year
- 43.2 in1098 mm
- Snow a year
- 21 in53 cm
- Last spring freeze
- Apr 15
- First fall freeze
- Oct 18
- Heating degree days
- 4,605
- Cooling degree days
- 1,231
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 9°−13° (heating, 99%) and 96°36° (cooling, 1%).
Month by month
Great Falls Crossing in January
Highs average 43°6° and lows 25°−4°, with 2.9 in75 mm of precipitation and 7 in18 cm of snow in a typical January.
- Record high
- 79°26° (2024)
- Record low
- −18°−28° (1984)
- Heating degree days
- 964
- Cooling degree days
- 0
Great Falls Crossing in February
Highs average 46°8° and lows 27°−3°, with 2.6 in66 mm of precipitation and 7 in18 cm of snow in a typical February.
- Record high
- 80°27° (2018)
- Record low
- −14°−26° (1979)
- Heating degree days
- 801
- Cooling degree days
- 0
Great Falls Crossing in March
Highs average 55°13° and lows 34°1°, with 3.5 in89 mm of precipitation and 4 in10 cm of snow in a typical March.
- Record high
- 89°32° (1990)
- Record low
- −1°−18° (1993)
- Heating degree days
- 647
- Cooling degree days
- 2
Great Falls Crossing in April
Highs average 67°19° and lows 43°6°, with 3.5 in88 mm of precipitation and 0.1 in0.3 cm of snow in a typical April.
- Record high
- 93°34° (1960)
- Record low
- 17°−8° (1969)
- Heating degree days
- 320
- Cooling degree days
- 20
Great Falls Crossing in May
Highs average 75°24° and lows 53°12°, with 4.7 in120 mm of precipitation in a typical May.
- Record high
- 97°36° (1969)
- Record low
- 28°−2° (1970)
- Heating degree days
- 115
- Cooling degree days
- 84
Great Falls Crossing in June
Highs average 83°28° and lows 62°17°, with 4.3 in109 mm of precipitation in a typical June.
- Record high
- 102°39° (2012)
- Record low
- 36°2° (1977)
- Heating degree days
- 13
- Cooling degree days
- 238
Great Falls Crossing in July
Highs average 88°31° and lows 67°19°, with 4.2 in105 mm of precipitation in a typical July.
- Record high
- 105°41° (2011)
- Record low
- 41°5° (1988)
- Heating degree days
- 0
- Cooling degree days
- 378
Great Falls Crossing in August
Highs average 86°30° and lows 65°18°, with 3.5 in90 mm of precipitation in a typical August.
- Record high
- 104°40° (1983)
- Record low
- 38°3° (1982)
- Heating degree days
- 1
- Cooling degree days
- 334
Great Falls Crossing in September
Highs average 79°26° and lows 58°14°, with 3.9 in100 mm of precipitation in a typical September.
- Record high
- 100°38° (2023)
- Record low
- 30°−1° (1974)
- Heating degree days
- 45
- Cooling degree days
- 152
Great Falls Crossing in OctoberThis month
Highs average 68°20° and lows 45°7°, with 3.7 in93 mm of precipitation in a typical October.
- Record high
- 96°36° (2019)
- Record low
- 15°−9° (1969)
- Heating degree days
- 284
- Cooling degree days
- 22
Great Falls Crossing in November
Highs average 57°14° and lows 36°2°, with 3.1 in80 mm of precipitation and 0.3 in0.8 cm of snow in a typical November.
- Record high
- 84°29° (1971)
- Record low
- 9°−13° (1989)
- Heating degree days
- 570
- Cooling degree days
- 1
Great Falls Crossing in December
Highs average 47°8° and lows 29°−2°, with 3.3 in84 mm of precipitation and 2.8 in7.1 cm of snow in a typical December.
- Record high
- 79°26° (1998)
- Record low
- −4°−20° (1989)
- Heating degree days
- 845
- Cooling degree days
- 0