Bull Valley weather by month
What a typical year looks like in Bull Valley, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at MCHENRY STRATTON LOCK/DAM, 9 km from Bull Valley; records cover 1992–2026.
The year at a glance
- Precipitation a year
- 37 in939 mm
- Snow a year
- 35 in88 cm
- Last spring freeze
- Apr 28
- First fall freeze
- Oct 11
- Heating degree days
- 6,688
- Cooling degree days
- 749
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −9°−23° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Bull Valley in January
Highs average 31°−1° and lows 13°−11°, with 1.7 in42 mm of precipitation and 11 in28 cm of snow in a typical January.
- Record high
- 62°17° (2008)
- Record low
- −32°−36° (2019)
- Heating degree days
- 1340
- Cooling degree days
- 0
Bull Valley in February
Highs average 35°1° and lows 16°−9°, with 1.6 in40 mm of precipitation and 9 in23 cm of snow in a typical February.
- Record high
- 78°26° (2024)
- Record low
- −23°−31° (1996)
- Heating degree days
- 1109
- Cooling degree days
- 0
Bull Valley in March
Highs average 46°8° and lows 26°−3°, with 2.2 in56 mm of precipitation and 4 in10 cm of snow in a typical March.
- Record high
- 83°28° (2012)
- Record low
- −13°−25° (2015)
- Heating degree days
- 902
- Cooling degree days
- 1
Bull Valley in April
Highs average 59°15° and lows 37°3°, with 3.6 in92 mm of precipitation and 1 in2.5 cm of snow in a typical April.
- Record high
- 90°32° (2002)
- Record low
- 14°−10° (1995)
- Heating degree days
- 525
- Cooling degree days
- 6
Bull Valley in May
Highs average 70°21° and lows 47°8°, with 4.5 in114 mm of precipitation in a typical May.
- Record high
- 99°37° (2018)
- Record low
- 26°−3° (2004)
- Heating degree days
- 239
- Cooling degree days
- 47
Bull Valley in June
Highs average 80°27° and lows 57°14°, with 4.8 in122 mm of precipitation in a typical June.
- Record high
- 100°38° (2022)
- Record low
- 35°2° (1993)
- Heating degree days
- 48
- Cooling degree days
- 156
Bull Valley in July
Highs average 84°29° and lows 62°16°, with 3.8 in97 mm of precipitation in a typical July.
- Record high
- 101°38° (1995)
- Record low
- 44°7° (2001)
- Heating degree days
- 9
- Cooling degree days
- 252
Bull Valley in August
Highs average 82°28° and lows 60°15°, with 3.7 in94 mm of precipitation in a typical August.
- Record high
- 98°37° (2023)
- Record low
- 40°4° (2009)
- Heating degree days
- 14
- Cooling degree days
- 200
Bull Valley in September
Highs average 76°24° and lows 51°11°, with 3.6 in92 mm of precipitation in a typical September.
- Record high
- 96°36° (2017)
- Record low
- 28°−2° (1993)
- Heating degree days
- 121
- Cooling degree days
- 78
Bull Valley in OctoberThis month
Highs average 63°17° and lows 40°4°, with 3.2 in82 mm of precipitation and 0.1 in0.3 cm of snow in a typical October.
- Record high
- 90°32° (2025)
- Record low
- 22°−6° (1997)
- Heating degree days
- 434
- Cooling degree days
- 9
Bull Valley in November
Highs average 48°9° and lows 29°−1°, with 2.4 in60 mm of precipitation and 1.4 in3.6 cm of snow in a typical November.
- Record high
- 78°26° (2022)
- Record low
- 4°−16° (1995)
- Heating degree days
- 788
- Cooling degree days
- 0
Bull Valley in December
Highs average 36°2° and lows 19°−7°, with 1.9 in49 mm of precipitation and 8 in21 cm of snow in a typical December.
- Record high
- 68°20° (2001)
- Record low
- −19°−28° (2000)
- Heating degree days
- 1159
- Cooling degree days
- 0