Penfield weather by month
What a typical year looks like in Penfield, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Ogden, 22 km from Penfield; records cover 2001–2026.
The year at a glance
- Precipitation a year
- 41.2 in1047 mm
- Snow a year
- 25 in64 cm
- Last spring freeze
- Apr 15
- First fall freeze
- Oct 19
- Heating degree days
- 5,638
- Cooling degree days
- 993
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −2°−19° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Penfield in January
Highs average 34°1° and lows 18°−8°, with 2.4 in60 mm of precipitation and 6 in15 cm of snow in a typical January.
- Record high
- 67°19° (2008)
- Record low
- −16°−27° (2009)
- Heating degree days
- 1206
- Cooling degree days
- 0
Penfield in February
Highs average 39°4° and lows 22°−6°, with 2.2 in55 mm of precipitation and 9 in24 cm of snow in a typical February.
- Record high
- 75°24° (2024)
- Record low
- −11°−24° (2014)
- Heating degree days
- 973
- Cooling degree days
- 0
Penfield in March
Highs average 51°10° and lows 30°−1°, with 2.8 in72 mm of precipitation and 3 in8 cm of snow in a typical March.
- Record high
- 89°32° (2026)
- Record low
- −6°−21° (2015)
- Heating degree days
- 765
- Cooling degree days
- 3
Penfield in April
Highs average 64°18° and lows 41°5°, with 3.9 in99 mm of precipitation and 0.3 in0.8 cm of snow in a typical April.
- Record high
- 88°31° (2002)
- Record low
- 19°−7° (2018)
- Heating degree days
- 390
- Cooling degree days
- 8
Penfield in May
Highs average 73°23° and lows 52°11°, with 5 in126 mm of precipitation in a typical May.
- Record high
- 95°35° (2018)
- Record low
- 28°−2° (2020)
- Heating degree days
- 150
- Cooling degree days
- 83
Penfield in June
Highs average 82°28° and lows 62°17°, with 5 in126 mm of precipitation in a typical June.
- Record high
- 100°38° (2022)
- Record low
- 38°3° (2003)
- Heating degree days
- 10
- Cooling degree days
- 214
Penfield in July
Highs average 84°29° and lows 65°18°, with 4.4 in112 mm of precipitation in a typical July.
- Record high
- 100°38° (2012)
- Record low
- 50°10° (2013)
- Heating degree days
- 2
- Cooling degree days
- 292
Penfield in August
Highs average 83°28° and lows 63°17°, with 3.5 in89 mm of precipitation in a typical August.
- Record high
- 100°38° (2025)
- Record low
- 47°8° (2025)
- Heating degree days
- 4
- Cooling degree days
- 244
Penfield in September
Highs average 78°26° and lows 56°13°, with 3.4 in85 mm of precipitation in a typical September.
- Record high
- 100°38° (2026)
- Record low
- 36°2° (2001)
- Heating degree days
- 72
- Cooling degree days
- 126
Penfield in OctoberThis month
Highs average 66°19° and lows 44°7°, with 3.3 in84 mm of precipitation in a typical October.
- Record high
- 91°33° (2025)
- Record low
- 23°−5° (2023)
- Heating degree days
- 332
- Cooling degree days
- 22
Penfield in November
Highs average 51°11° and lows 32°0°, with 3.2 in80 mm of precipitation and 1 in2.5 cm of snow in a typical November.
- Record high
- 79°26° (2003)
- Record low
- 4°−16° (2019)
- Heating degree days
- 699
- Cooling degree days
- 1
Penfield in December
Highs average 39°4° and lows 24°−5°, with 2.4 in60 mm of precipitation and 6 in14 cm of snow in a typical December.
- Record high
- 72°22° (2012)
- Record low
- −13°−25° (2025)
- Heating degree days
- 1035
- Cooling degree days
- 0