West Union weather by month
What a typical year looks like in West Union, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Robinson, 25 km from West Union; records cover 1895–2026.
The year at a glance
- Precipitation a year
- 45.5 in1155 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 14
- First fall freeze
- Oct 22
- Heating degree days
- 5,170
- Cooling degree days
- 1,250
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 0°−18° (heating, 99%) and 97°36° (cooling, 1%).
Month by month
West Union in January
Highs average 37°3° and lows 20°−7°, with 3.1 in79 mm of precipitation in a typical January.
- Record high
- 73°23° (1909)
- Record low
- −17°−27° (1904)
- Heating degree days
- 1128
- Cooling degree days
- 0
West Union in February
Highs average 42°6° and lows 23°−5°, with 2.4 in61 mm of precipitation in a typical February.
- Record high
- 74°23° (2018)
- Record low
- −20°−29° (1899)
- Heating degree days
- 903
- Cooling degree days
- 0
West Union in March
Highs average 53°12° and lows 33°0°, with 3.6 in92 mm of precipitation in a typical March.
- Record high
- 87°31° (1910)
- Record low
- −5°−21° (2015)
- Heating degree days
- 694
- Cooling degree days
- 3
West Union in April
Highs average 66°19° and lows 43°6°, with 5.2 in131 mm of precipitation in a typical April.
- Record high
- 88°31° (1899)
- Record low
- 22°−6° (1899)
- Heating degree days
- 339
- Cooling degree days
- 17
West Union in May
Highs average 76°24° and lows 54°12°, with 4.7 in119 mm of precipitation in a typical May.
- Record high
- 97°36° (1911)
- Record low
- 26°−3° (1903)
- Heating degree days
- 112
- Cooling degree days
- 112
West Union in June
Highs average 85°29° and lows 63°17°, with 4.6 in116 mm of precipitation in a typical June.
- Record high
- 105°41° (2012)
- Record low
- 39°4° (1903)
- Heating degree days
- 8
- Cooling degree days
- 279
West Union in July
Highs average 87°31° and lows 66°19°, with 4.2 in106 mm of precipitation in a typical July.
- Record high
- 108°42° (1901)
- Record low
- 48°9° (1904)
- Heating degree days
- 1
- Cooling degree days
- 359
West Union in August
Highs average 86°30° and lows 63°17°, with 3.5 in88 mm of precipitation in a typical August.
- Record high
- 103°39° (1897)
- Record low
- 45°7° (2004)
- Heating degree days
- 3
- Cooling degree days
- 299
West Union in September
Highs average 81°27° and lows 56°13°, with 3.7 in93 mm of precipitation in a typical September.
- Record high
- 103°39° (1899)
- Record low
- 25°−4° (1899)
- Heating degree days
- 55
- Cooling degree days
- 151
West Union in OctoberThis month
Highs average 68°20° and lows 44°7°, with 3.7 in94 mm of precipitation in a typical October.
- Record high
- 95°35° (1897)
- Record low
- 21°−6° (2023)
- Heating degree days
- 308
- Cooling degree days
- 29
West Union in November
Highs average 54°12° and lows 34°1°, with 3.8 in96 mm of precipitation in a typical November.
- Record high
- 83°28° (2016)
- Record low
- 3°−16° (2019)
- Heating degree days
- 643
- Cooling degree days
- 1
West Union in December
Highs average 42°5° and lows 25°−4°, with 3.2 in80 mm of precipitation in a typical December.
- Record high
- 72°22° (2012)
- Record low
- −9°−23° (2022)
- Heating degree days
- 976
- Cooling degree days
- 0