Chemung weather by month
What a typical year looks like in Chemung, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Clinton Wwtp, 23 km from Chemung; records cover 2000–2026.
The year at a glance
- Precipitation a year
- 37.7 in958 mm
- Snow a year
- 38 in96 cm
- Last spring freeze
- May 4
- First fall freeze
- Oct 7
- Heating degree days
- 7,154
- Cooling degree days
- 617
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −11°−24° (heating, 99%) and 91°33° (cooling, 1%).
Month by month
Chemung in January
Highs average 27°−3° and lows 10°−12°, with 1.6 in41 mm of precipitation and 11 in27 cm of snow in a typical January.
- Record high
- 61°16° (2008)
- Record low
- −28°−33° (2009)
- Heating degree days
- 1432
- Cooling degree days
- 0
Chemung in February
Highs average 31°0° and lows 15°−10°, with 1.6 in40 mm of precipitation and 11 in28 cm of snow in a typical February.
- Record high
- 72°22° (2024)
- Record low
- −21°−29° (2021)
- Heating degree days
- 1174
- Cooling degree days
- 0
Chemung in March
Highs average 44°6° and lows 25°−4°, with 2.2 in55 mm of precipitation and 3 in8 cm of snow in a typical March.
- Record high
- 82°28° (2012)
- Record low
- −17°−27° (2002)
- Heating degree days
- 950
- Cooling degree days
- 1
Chemung in April
Highs average 57°14° and lows 36°2°, with 3.8 in97 mm of precipitation and 0.8 in2 cm of snow in a typical April.
- Record high
- 90°32° (2002)
- Record low
- 14°−10° (2003)
- Heating degree days
- 554
- Cooling degree days
- 2
Chemung in May
Highs average 69°20° and lows 48°9°, with 4.2 in108 mm of precipitation in a typical May.
- Record high
- 96°36° (2012)
- Record low
- 22°−6° (2002)
- Heating degree days
- 250
- Cooling degree days
- 37
Chemung in June
Highs average 78°26° and lows 58°14°, with 5.5 in138 mm of precipitation in a typical June.
- Record high
- 98°37° (2012)
- Record low
- 38°3° (2023)
- Heating degree days
- 45
- Cooling degree days
- 138
Chemung in July
Highs average 82°28° and lows 61°16°, with 3.7 in95 mm of precipitation in a typical July.
- Record high
- 102°39° (2012)
- Record low
- 45°7° (2014)
- Heating degree days
- 12
- Cooling degree days
- 210
Chemung in August
Highs average 80°27° and lows 59°15°, with 4.2 in106 mm of precipitation in a typical August.
- Record high
- 96°36° (2003)
- Record low
- 39°4° (2004)
- Heating degree days
- 21
- Cooling degree days
- 158
Chemung in September
Highs average 74°23° and lows 51°11°, with 3.8 in98 mm of precipitation in a typical September.
- Record high
- 95°35° (2017)
- Record low
- 28°−2° (2003)
- Heating degree days
- 139
- Cooling degree days
- 64
Chemung in OctoberThis month
Highs average 60°16° and lows 39°4°, with 2.9 in73 mm of precipitation and 0.1 in0.3 cm of snow in a typical October.
- Record high
- 89°32° (2025)
- Record low
- 15°−9° (2003)
- Heating degree days
- 484
- Cooling degree days
- 7
Chemung in November
Highs average 45°7° and lows 28°−2°, with 2.4 in60 mm of precipitation and 2.1 in5.3 cm of snow in a typical November.
- Record high
- 75°24° (2016)
- Record low
- −4°−20° (2019)
- Heating degree days
- 849
- Cooling degree days
- 0
Chemung in December
Highs average 33°0° and lows 17°−8°, with 1.9 in48 mm of precipitation and 10 in25 cm of snow in a typical December.
- Record high
- 66°19° (2012)
- Record low
- −20°−29° (2016)
- Heating degree days
- 1244
- Cooling degree days
- 0