Unionville weather by month
What a typical year looks like in Unionville, Virginia: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Louisa, 24 km from Unionville; records cover 1916–2026.
The year at a glance
- Precipitation a year
- 44.2 in1123 mm
- Snow a year
- 16 in40 cm
- Last spring freeze
- Apr 26
- First fall freeze
- Oct 17
- Heating degree days
- 4,448
- Cooling degree days
- 1,119
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 8°−13° (heating, 99%) and 96°36° (cooling, 1%).
Month by month
Unionville in January
Highs average 45°7° and lows 25°−4°, with 3 in76 mm of precipitation and 5 in11 cm of snow in a typical January.
- Record high
- 80°27° (2002)
- Record low
- −20°−29° (1940)
- Heating degree days
- 921
- Cooling degree days
- 0
Unionville in February
Highs average 49°10° and lows 27°−3°, with 2.7 in70 mm of precipitation and 6 in15 cm of snow in a typical February.
- Record high
- 82°28° (1932)
- Record low
- −21°−29° (1996)
- Heating degree days
- 750
- Cooling degree days
- 0
Unionville in March
Highs average 58°15° and lows 33°0°, with 3.7 in94 mm of precipitation and 1.5 in3.8 cm of snow in a typical March.
- Record high
- 89°32° (1945)
- Record low
- −5°−21° (2014)
- Heating degree days
- 607
- Cooling degree days
- 2
Unionville in April
Highs average 70°21° and lows 42°6°, with 3.4 in86 mm of precipitation and 0.3 in0.8 cm of snow in a typical April.
- Record high
- 96°36° (1925)
- Record low
- 13°−11° (1923)
- Heating degree days
- 292
- Cooling degree days
- 24
Unionville in May
Highs average 76°24° and lows 52°11°, with 4 in101 mm of precipitation in a typical May.
- Record high
- 99°37° (1941)
- Record low
- 26°−3° (1947)
- Heating degree days
- 112
- Cooling degree days
- 81
Unionville in June
Highs average 83°28° and lows 61°16°, with 4.3 in110 mm of precipitation in a typical June.
- Record high
- 101°38° (1944)
- Record low
- 36°2° (1930)
- Heating degree days
- 15
- Cooling degree days
- 223
Unionville in July
Highs average 87°30° and lows 65°18°, with 4.2 in106 mm of precipitation in a typical July.
- Record high
- 108°42° (1930)
- Record low
- 37°3° (1922)
- Heating degree days
- 0
- Cooling degree days
- 340
Unionville in August
Highs average 85°30° and lows 64°18°, with 3.7 in93 mm of precipitation in a typical August.
- Record high
- 105°41° (1930)
- Record low
- 36°2° (1929)
- Heating degree days
- 2
- Cooling degree days
- 295
Unionville in September
Highs average 79°26° and lows 56°13°, with 4.5 in114 mm of precipitation in a typical September.
- Record high
- 104°40° (1932)
- Record low
- 29°−2° (1942)
- Heating degree days
- 52
- Cooling degree days
- 132
Unionville in OctoberThis month
Highs average 69°20° and lows 44°7°, with 3.8 in97 mm of precipitation in a typical October.
- Record high
- 98°37° (1941)
- Record low
- 18°−8° (1969)
- Heating degree days
- 284
- Cooling degree days
- 21
Unionville in November
Highs average 57°14° and lows 34°1°, with 3.6 in91 mm of precipitation and 0.1 in0.3 cm of snow in a typical November.
- Record high
- 88°31° (1974)
- Record low
- 4°−16° (1930)
- Heating degree days
- 579
- Cooling degree days
- 1
Unionville in December
Highs average 48°9° and lows 28°−2°, with 3.3 in85 mm of precipitation and 3 in8 cm of snow in a typical December.
- Record high
- 79°26° (1984)
- Record low
- −9°−23° (1917)
- Heating degree days
- 834
- Cooling degree days
- 0