Ellis Grove weather by month
What a typical year looks like in Ellis Grove, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Kaskaskia River Navigation Lock, 4 km from Ellis Grove; records cover 1974–2026.
The year at a glance
- Precipitation a year
- 42.8 in1088 mm
- Snow a year
- 4 in11 cm
- Last spring freeze
- Apr 5
- First fall freeze
- Oct 29
- Heating degree days
- 4,575
- Cooling degree days
- 1,460
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 99°37° (cooling, 1%).
Month by month
Ellis Grove in January
Highs average 40°5° and lows 24°−4°, with 2.7 in69 mm of precipitation and 1.4 in3.6 cm of snow in a typical January.
- Record high
- 74°23° (1986)
- Record low
- −18°−28° (1985)
- Heating degree days
- 1016
- Cooling degree days
- 0
Ellis Grove in February
Highs average 46°8° and lows 27°−3°, with 2.4 in60 mm of precipitation and 1.5 in3.8 cm of snow in a typical February.
- Record high
- 84°29° (2024)
- Record low
- −14°−26° (1985)
- Heating degree days
- 798
- Cooling degree days
- 0
Ellis Grove in March
Highs average 56°13° and lows 35°2°, with 3.4 in87 mm of precipitation and 0.1 in0.3 cm of snow in a typical March.
- Record high
- 92°33° (2026)
- Record low
- −4°−20° (1978)
- Heating degree days
- 606
- Cooling degree days
- 3
Ellis Grove in April
Highs average 68°20° and lows 44°7°, with 4.7 in119 mm of precipitation in a typical April.
- Record high
- 99°37° (1989)
- Record low
- 22°−6° (2007)
- Heating degree days
- 298
- Cooling degree days
- 22
Ellis Grove in May
Highs average 77°25° and lows 55°13°, with 5.2 in132 mm of precipitation in a typical May.
- Record high
- 98°37° (1998)
- Record low
- 31°−1° (1976)
- Heating degree days
- 89
- Cooling degree days
- 119
Ellis Grove in June
Highs average 86°30° and lows 64°18°, with 4.1 in105 mm of precipitation in a typical June.
- Record high
- 109°43° (2012)
- Record low
- 44°7° (1988)
- Heating degree days
- 5
- Cooling degree days
- 308
Ellis Grove in July
Highs average 89°32° and lows 68°20°, with 4.1 in105 mm of precipitation in a typical July.
- Record high
- 109°43° (1987)
- Record low
- 51°11° (2004)
- Heating degree days
- 0
- Cooling degree days
- 425
Ellis Grove in August
Highs average 88°31° and lows 66°19°, with 3.3 in85 mm of precipitation in a typical August.
- Record high
- 109°43° (1988)
- Record low
- 41°5° (1986)
- Heating degree days
- 2
- Cooling degree days
- 364
Ellis Grove in September
Highs average 81°27° and lows 58°14°, with 2.9 in75 mm of precipitation in a typical September.
- Record high
- 112°44° (1990)
- Record low
- 32°0° (1984)
- Heating degree days
- 43
- Cooling degree days
- 180
Ellis Grove in OctoberThis month
Highs average 70°21° and lows 46°8°, with 3.1 in78 mm of precipitation in a typical October.
- Record high
- 96°36° (1989)
- Record low
- 23°−5° (1981)
- Heating degree days
- 256
- Cooling degree days
- 37
Ellis Grove in November
Highs average 56°13° and lows 37°3°, with 4 in102 mm of precipitation and 0.4 in1 cm of snow in a typical November.
- Record high
- 89°32° (1990)
- Record low
- 8°−13° (1976)
- Heating degree days
- 571
- Cooling degree days
- 2
Ellis Grove in December
Highs average 44°7° and lows 28°−2°, with 2.9 in72 mm of precipitation and 0.9 in2.3 cm of snow in a typical December.
- Record high
- 78°26° (1988)
- Record low
- −18°−28° (1989)
- Heating degree days
- 891
- Cooling degree days
- 0