Avon weather by month
What a typical year looks like in Avon, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Avon, 1 km from Avon; records cover 2000–2026.
The year at a glance
- Precipitation a year
- 37.6 in956 mm
- Snow a year
- 24 in61 cm
- Last spring freeze
- Apr 23
- First fall freeze
- Oct 12
- Heating degree days
- 6,436
- Cooling degree days
- 765
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −7°−22° (heating, 99%) and 94°34° (cooling, 1%).
Month by month
Avon in January
Highs average 31°−1° and lows 13°−11°, with 1.8 in46 mm of precipitation and 7 in19 cm of snow in a typical January.
- Record high
- 63°17° (2013)
- Record low
- −26°−32° (2009)
- Heating degree days
- 1336
- Cooling degree days
- 0
Avon in February
Highs average 36°2° and lows 17°−9°, with 1.8 in47 mm of precipitation and 6 in15 cm of snow in a typical February.
- Record high
- 77°25° (2024)
- Record low
- −14°−26° (2019)
- Heating degree days
- 1090
- Cooling degree days
- 0
Avon in March
Highs average 48°9° and lows 26°−3°, with 2.4 in60 mm of precipitation and 2.7 in6.9 cm of snow in a typical March.
- Record high
- 87°31° (2026)
- Record low
- −4°−20° (2015)
- Heating degree days
- 858
- Cooling degree days
- 1
Avon in April
Highs average 62°17° and lows 37°3°, with 3.6 in92 mm of precipitation and 1.1 in2.8 cm of snow in a typical April.
- Record high
- 86°30° (2012)
- Record low
- −1°−18° (2018)
- Heating degree days
- 472
- Cooling degree days
- 4
Avon in May
Highs average 72°22° and lows 49°10°, with 5 in126 mm of precipitation in a typical May.
- Record high
- 97°36° (2018)
- Record low
- 26°−3° (2019)
- Heating degree days
- 191
- Cooling degree days
- 58
Avon in June
Highs average 81°27° and lows 59°15°, with 4.4 in111 mm of precipitation in a typical June.
- Record high
- 98°37° (2009)
- Record low
- 44°7° (2012)
- Heating degree days
- 22
- Cooling degree days
- 165
Avon 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° (2012)
- Record low
- 46°8° (2024)
- Heating degree days
- 6
- Cooling degree days
- 254
Avon in August
Highs average 82°28° and lows 60°15°, with 3.7 in93 mm of precipitation in a typical August.
- Record high
- 96°36° (2012)
- Record low
- 43°6° (2009)
- Heating degree days
- 12
- Cooling degree days
- 200
Avon in September
Highs average 77°25° and lows 51°11°, with 3.7 in93 mm of precipitation in a typical September.
- Record high
- 99°37° (2011)
- Record low
- 31°−1° (2012)
- Heating degree days
- 104
- Cooling degree days
- 71
Avon in OctoberThis month
Highs average 64°18° and lows 40°4°, with 2.9 in72 mm of precipitation in a typical October.
- Record high
- 90°32° (2025)
- Record low
- 20°−7° (2017)
- Heating degree days
- 415
- Cooling degree days
- 12
Avon in November
Highs average 49°10° and lows 29°−2°, with 2.4 in60 mm of precipitation and 1 in2.5 cm of snow in a typical November.
- Record high
- 77°25° (2012)
- Record low
- 2°−17° (2019)
- Heating degree days
- 782
- Cooling degree days
- 0
Avon in December
Highs average 36°2° and lows 20°−7°, with 1.9 in47 mm of precipitation and 6 in15 cm of snow in a typical December.
- Record high
- 72°22° (2012)
- Record low
- −12°−24° (2017)
- Heating degree days
- 1148
- Cooling degree days
- 0