Union weather by month
What a typical year looks like in Union, West Virginia: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Alderson, 18 km from Union; records cover 1944–2026.
The year at a glance
- Precipitation a year
- 40.7 in1033 mm
- Snow a year
- 12 in31 cm
- Last spring freeze
- Apr 26
- First fall freeze
- Oct 19
- Heating degree days
- 5,173
- Cooling degree days
- 773
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 5°−15° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Union in January
Highs average 41°5° and lows 22°−6°, with 3 in77 mm of precipitation and 4 in9 cm of snow in a typical January.
- Record high
- 78°26° (2002)
- Record low
- −9°−23° (2014)
- Heating degree days
- 1041
- Cooling degree days
- 0
Union in February
Highs average 45°7° and lows 24°−5°, with 2.9 in73 mm of precipitation and 4 in11 cm of snow in a typical February.
- Record high
- 79°26° (2002)
- Record low
- −12°−24° (1951)
- Heating degree days
- 850
- Cooling degree days
- 0
Union in March
Highs average 54°12° and lows 30°−1°, with 3.8 in97 mm of precipitation and 2 in5.1 cm of snow in a typical March.
- Record high
- 88°31° (2020)
- Record low
- 0°−18° (2014)
- Heating degree days
- 719
- Cooling degree days
- 0
Union in April
Highs average 66°19° and lows 39°4°, with 3.6 in91 mm of precipitation and 0.1 in0.3 cm of snow in a typical April.
- Record high
- 91°33° (1955)
- Record low
- 13°−11° (1947)
- Heating degree days
- 375
- Cooling degree days
- 4
Union in May
Highs average 75°24° and lows 49°9°, with 4.4 in112 mm of precipitation in a typical May.
- Record high
- 96°36° (2006)
- Record low
- 24°−4° (1947)
- Heating degree days
- 153
- Cooling degree days
- 49
Union in June
Highs average 81°27° and lows 58°14°, with 3.7 in94 mm of precipitation in a typical June.
- Record high
- 96°36° (1954)
- Record low
- 37°3° (1959)
- Heating degree days
- 20
- Cooling degree days
- 148
Union in July
Highs average 84°29° and lows 62°17°, with 4.2 in107 mm of precipitation in a typical July.
- Record high
- 102°39° (1954)
- Record low
- 40°4° (1947)
- Heating degree days
- 3
- Cooling degree days
- 252
Union in August
Highs average 83°29° and lows 60°16°, with 3.1 in80 mm of precipitation in a typical August.
- Record high
- 98°37° (1948)
- Record low
- 42°6° (1951)
- Heating degree days
- 4
- Cooling degree days
- 217
Union in September
Highs average 78°26° and lows 54°12°, with 3.4 in85 mm of precipitation in a typical September.
- Record high
- 99°37° (1953)
- Record low
- 31°−1° (1956)
- Heating degree days
- 67
- Cooling degree days
- 92
Union in OctoberThis month
Highs average 68°20° and lows 41°5°, with 2.6 in67 mm of precipitation and 0.1 in0.3 cm of snow in a typical October.
- Record high
- 94°34° (2019)
- Record low
- 11°−12° (1952)
- Heating degree days
- 343
- Cooling degree days
- 11
Union in November
Highs average 55°13° and lows 30°−1°, with 2.6 in65 mm of precipitation and 0.2 in0.5 cm of snow in a typical November.
- Record high
- 85°29° (1946)
- Record low
- 6°−14° (1950)
- Heating degree days
- 663
- Cooling degree days
- 0
Union in December
Highs average 45°7° and lows 25°−4°, with 3.4 in86 mm of precipitation and 2 in5.1 cm of snow in a typical December.
- Record high
- 78°26° (2015)
- Record low
- −8°−22° (1944)
- Heating degree days
- 935
- Cooling degree days
- 0