Henry weather by month
What a typical year looks like in Henry, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Hennepin, 15 km from Henry; records cover 2011–2026.
The year at a glance
- Precipitation a year
- 38.6 in980 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 20
- First fall freeze
- Oct 22
- Heating degree days
- 5,869
- Cooling degree days
- 944
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
Henry in January
Highs average 32°0° and lows 17°−8°, with 2 in50 mm of precipitation in a typical January.
- Record high
- 64°18° (2013)
- Record low
- −26°−32° (2019)
- Heating degree days
- 1254
- Cooling degree days
- 0
Henry in February
Highs average 37°3° and lows 20°−7°, with 1.8 in46 mm of precipitation in a typical February.
- Record high
- 73°23° (2024)
- Record low
- −19°−28° (2014)
- Heating degree days
- 1019
- Cooling degree days
- 0
Henry in March
Highs average 50°10° and lows 30°−1°, with 2.5 in62 mm of precipitation in a typical March.
- Record high
- 83°28° (2012)
- Record low
- −7°−22° (2014)
- Heating degree days
- 775
- Cooling degree days
- 3
Henry in April
Highs average 64°18° and lows 41°5°, with 3.9 in98 mm of precipitation in a typical April.
- Record high
- 84°29° (2013)
- Record low
- 17°−8° (2018)
- Heating degree days
- 396
- Cooling degree days
- 6
Henry in May
Highs average 74°23° and lows 51°11°, with 4.8 in121 mm of precipitation in a typical May.
- Record high
- 95°35° (2018)
- Record low
- 28°−2° (2020)
- Heating degree days
- 145
- Cooling degree days
- 67
Henry in June
Highs average 82°28° and lows 61°16°, with 4.6 in116 mm of precipitation in a typical June.
- Record high
- 97°36° (2012)
- Record low
- 43°6° (2015)
- Heating degree days
- 11
- Cooling degree days
- 207
Henry in July
Highs average 85°29° and lows 65°18°, with 3.9 in99 mm of precipitation in a typical July.
- Record high
- 103°39° (2012)
- Record low
- 49°9° (2013)
- Heating degree days
- 2
- Cooling degree days
- 296
Henry in August
Highs average 83°28° and lows 62°17°, with 3.8 in96 mm of precipitation in a typical August.
- Record high
- 97°36° (2023)
- Record low
- 48°9° (2013)
- Heating degree days
- 6
- Cooling degree days
- 243
Henry in September
Highs average 77°25° and lows 55°13°, with 3.5 in88 mm of precipitation in a typical September.
- Record high
- 95°35° (2013)
- Record low
- 35°2° (2012)
- Heating degree days
- 83
- Cooling degree days
- 107
Henry in OctoberThis month
Highs average 65°18° and lows 43°6°, with 3.3 in84 mm of precipitation in a typical October.
- Record high
- 88°31° (2025)
- Record low
- 23°−5° (2018)
- Heating degree days
- 352
- Cooling degree days
- 14
Henry in November
Highs average 50°10° and lows 32°0°, with 2.6 in66 mm of precipitation in a typical November.
- Record high
- 77°25° (2016)
- Record low
- 5°−15° (2014)
- Heating degree days
- 718
- Cooling degree days
- 1
Henry in December
Highs average 37°3° and lows 22°−6°, with 2.2 in56 mm of precipitation in a typical December.
- Record high
- 70°21° (2012)
- Record low
- −12°−24° (2016)
- Heating degree days
- 1108
- Cooling degree days
- 0