West Chicago weather by month
What a typical year looks like in West Chicago, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at AURORA WATER, 15 km from West Chicago; records cover 1887–2026.
The year at a glance
- Precipitation a year
- 39.5 in1003 mm
- Snow a year
- 28 in71 cm
- Last spring freeze
- Apr 21
- First fall freeze
- Oct 15
- Heating degree days
- 6,255
- Cooling degree days
- 911
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −6°−21° (heating, 99%) and 94°34° (cooling, 1%).
Month by month
West Chicago in January
Highs average 31°−1° and lows 16°−9°, with 1.9 in47 mm of precipitation and 9 in23 cm of snow in a typical January.
- Record high
- 70°21° (1895)
- Record low
- −26°−32° (1985)
- Heating degree days
- 1294
- Cooling degree days
- 0
West Chicago in February
Highs average 35°2° and lows 20°−7°, with 1.8 in46 mm of precipitation and 8 in20 cm of snow in a typical February.
- Record high
- 74°23° (2024)
- Record low
- −25°−32° (1905)
- Heating degree days
- 1058
- Cooling degree days
- 0
West Chicago in March
Highs average 47°8° and lows 29°−2°, with 2.4 in60 mm of precipitation and 2.6 in6.6 cm of snow in a typical March.
- Record high
- 84°29° (2012)
- Record low
- −15°−26° (1943)
- Heating degree days
- 840
- Cooling degree days
- 2
West Chicago in April
Highs average 60°15° and lows 39°4°, with 4.1 in103 mm of precipitation and 0.6 in1.5 cm of snow in a typical April.
- Record high
- 92°33° (1930)
- Record low
- 8°−13° (1890)
- Heating degree days
- 470
- Cooling degree days
- 7
West Chicago in May
Highs average 71°22° and lows 50°10°, with 4.9 in123 mm of precipitation in a typical May.
- Record high
- 104°40° (1934)
- Record low
- 21°−6° (1966)
- Heating degree days
- 195
- Cooling degree days
- 58
West Chicago in June
Highs average 81°27° and lows 60°16°, with 4.5 in114 mm of precipitation in a typical June.
- Record high
- 106°41° (1897)
- Record low
- 32°0° (1888)
- Heating degree days
- 30
- Cooling degree days
- 189
West Chicago in July
Highs average 84°29° and lows 65°18°, with 4.2 in106 mm of precipitation in a typical July.
- Record high
- 111°44° (1936)
- Record low
- 40°4° (1907)
- Heating degree days
- 3
- Cooling degree days
- 294
West Chicago in August
Highs average 82°28° and lows 63°17°, with 3.9 in98 mm of precipitation in a typical August.
- Record high
- 105°41° (1934)
- Record low
- 37°3° (1915)
- Heating degree days
- 6
- Cooling degree days
- 242
West Chicago in September
Highs average 76°24° and lows 55°13°, with 3.4 in86 mm of precipitation in a typical September.
- Record high
- 103°39° (1939)
- Record low
- 24°−4° (1899)
- Heating degree days
- 90
- Cooling degree days
- 106
West Chicago in OctoberThis month
Highs average 63°17° and lows 43°6°, with 3.7 in94 mm of precipitation in a typical October.
- Record high
- 93°34° (1897)
- Record low
- 11°−12° (1925)
- Heating degree days
- 386
- Cooling degree days
- 13
West Chicago in November
Highs average 48°9° and lows 32°0°, with 2.7 in69 mm of precipitation and 1.3 in3.3 cm of snow in a typical November.
- Record high
- 81°27° (1950)
- Record low
- −11°−24° (1947)
- Heating degree days
- 758
- Cooling degree days
- 0
West Chicago in December
Highs average 36°2° and lows 22°−6°, with 2.2 in56 mm of precipitation and 6 in16 cm of snow in a typical December.
- Record high
- 70°21° (2012)
- Record low
- −25°−32° (1914)
- Heating degree days
- 1125
- Cooling degree days
- 0