Homer Glen weather by month
What a typical year looks like in Homer Glen, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at ROMEOVILLE WFO, 11 km from Homer Glen; records cover 1992–2026.
The year at a glance
- Precipitation a year
- 41.1 in1045 mm
- Snow a year
- 33 in84 cm
- Last spring freeze
- Apr 22
- First fall freeze
- Oct 16
- Heating degree days
- 6,063
- Cooling degree days
- 947
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −5°−21° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Homer Glen in January
Highs average 32°0° and lows 16°−9°, with 2.2 in56 mm of precipitation and 11 in27 cm of snow in a typical January.
- Record high
- 65°18° (2008)
- Record low
- −24°−31° (2009)
- Heating degree days
- 1274
- Cooling degree days
- 0
Homer Glen in February
Highs average 36°2° and lows 20°−7°, with 2 in50 mm of precipitation and 9 in22 cm of snow in a typical February.
- Record high
- 73°23° (2000)
- Record low
- −19°−28° (1996)
- Heating degree days
- 1036
- Cooling degree days
- 0
Homer Glen in March
Highs average 49°9° and lows 30°−1°, with 2.7 in69 mm of precipitation and 4 in11 cm of snow in a typical March.
- Record high
- 85°29° (2012)
- Record low
- −13°−25° (2002)
- Heating degree days
- 806
- Cooling degree days
- 3
Homer Glen in April
Highs average 61°16° and lows 40°4°, with 4.1 in104 mm of precipitation and 0.9 in2.3 cm of snow in a typical April.
- Record high
- 89°32° (1994)
- Record low
- 16°−9° (1994)
- Heating degree days
- 448
- Cooling degree days
- 7
Homer Glen in May
Highs average 72°22° and lows 50°10°, with 4.8 in122 mm of precipitation in a typical May.
- Record high
- 97°36° (2025)
- Record low
- 12°−11° (1994)
- Heating degree days
- 180
- Cooling degree days
- 67
Homer Glen in June
Highs average 82°28° and lows 60°16°, with 4.7 in119 mm of precipitation in a typical June.
- Record high
- 99°37° (2012)
- Record low
- 38°3° (1992)
- Heating degree days
- 23
- Cooling degree days
- 200
Homer Glen in July
Highs average 85°29° and lows 65°18°, with 4.5 in114 mm of precipitation in a typical July.
- Record high
- 102°39° (2005)
- Record low
- 48°9° (2001)
- Heating degree days
- 2
- Cooling degree days
- 300
Homer Glen in August
Highs average 83°28° and lows 63°17°, with 4.4 in111 mm of precipitation in a typical August.
- Record high
- 97°36° (1995)
- Record low
- 47°8° (2009)
- Heating degree days
- 4
- Cooling degree days
- 248
Homer Glen in September
Highs average 76°25° and lows 55°13°, with 3.3 in84 mm of precipitation in a typical September.
- Record high
- 94°34° (2002)
- Record low
- 29°−2° (1995)
- Heating degree days
- 80
- Cooling degree days
- 106
Homer Glen in OctoberThis month
Highs average 64°18° and lows 44°6°, with 3.7 in93 mm of precipitation and 0.1 in0.3 cm of snow in a typical October.
- Record high
- 89°32° (2005)
- Record low
- 20°−7° (1992)
- Heating degree days
- 368
- Cooling degree days
- 16
Homer Glen in November
Highs average 49°9° and lows 32°0°, with 2.7 in68 mm of precipitation and 1.2 in3 cm of snow in a typical November.
- Record high
- 77°25° (2020)
- Record low
- 6°−14° (2015)
- Heating degree days
- 738
- Cooling degree days
- 0
Homer Glen in December
Highs average 37°3° and lows 22°−6°, with 2.2 in55 mm of precipitation and 8 in19 cm of snow in a typical December.
- Record high
- 71°22° (2012)
- Record low
- −12°−24° (2016)
- Heating degree days
- 1104
- Cooling degree days
- 0