Lee weather by month
What a typical year looks like in Lee, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Paw Paw 2s, 15 km from Lee; records cover 1935–2026.
The year at a glance
- Precipitation a year
- 36.7 in933 mm
- Snow a year
- 30 in76 cm
- Last spring freeze
- Apr 27
- First fall freeze
- Oct 12
- Heating degree days
- 6,893
- Cooling degree days
- 670
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 91°33° (cooling, 1%).
Month by month
Lee in January
Highs average 28°−2° and lows 12°−11°, with 1.6 in41 mm of precipitation and 10 in24 cm of snow in a typical January.
- Record high
- 64°18° (1967)
- Record low
- −28°−33° (1985)
- Heating degree days
- 1399
- Cooling degree days
- 0
Lee in February
Highs average 32°0° and lows 16°−9°, with 1.7 in44 mm of precipitation and 7 in17 cm of snow in a typical February.
- Record high
- 75°24° (2024)
- Record low
- −33°−36° (1996)
- Heating degree days
- 1151
- Cooling degree days
- 0
Lee in March
Highs average 45°7° and lows 26°−3°, with 2.2 in56 mm of precipitation and 4 in9 cm of snow in a typical March.
- Record high
- 83°28° (1986)
- Record low
- −16°−27° (2002)
- Heating degree days
- 918
- Cooling degree days
- 0
Lee in April
Highs average 59°15° and lows 36°2°, with 3.2 in81 mm of precipitation and 0.9 in2.3 cm of snow in a typical April.
- Record high
- 92°33° (2002)
- Record low
- 9°−13° (1982)
- Heating degree days
- 522
- Cooling degree days
- 3
Lee in May
Highs average 70°21° and lows 48°9°, with 4.8 in123 mm of precipitation in a typical May.
- Record high
- 95°35° (2012)
- Record low
- 24°−4° (2005)
- Heating degree days
- 223
- Cooling degree days
- 45
Lee in June
Highs average 80°26° and lows 58°15°, with 4.6 in117 mm of precipitation in a typical June.
- Record high
- 101°38° (1988)
- Record low
- 36°2° (1972)
- Heating degree days
- 37
- Cooling degree days
- 156
Lee in July
Highs average 82°28° and lows 62°17°, with 3.9 in99 mm of precipitation in a typical July.
- Record high
- 101°38° (1966)
- Record low
- 41°5° (2000)
- Heating degree days
- 9
- Cooling degree days
- 220
Lee in August
Highs average 80°27° and lows 60°15°, with 3.7 in95 mm of precipitation in a typical August.
- Record high
- 99°37° (1988)
- Record low
- 37°3° (1986)
- Heating degree days
- 16
- Cooling degree days
- 168
Lee in September
Highs average 75°24° and lows 52°11°, with 3.6 in91 mm of precipitation in a typical September.
- Record high
- 93°34° (1978)
- Record low
- 29°−2° (1995)
- Heating degree days
- 124
- Cooling degree days
- 70
Lee in OctoberThis month
Highs average 63°17° and lows 40°4°, with 3 in76 mm of precipitation and 0.1 in0.3 cm of snow in a typical October.
- Record high
- 90°32° (2007)
- Record low
- 16°−9° (1962)
- Heating degree days
- 438
- Cooling degree days
- 8
Lee in November
Highs average 46°8° and lows 28°−2°, with 2.4 in62 mm of precipitation and 1.7 in4.3 cm of snow in a typical November.
- Record high
- 76°24° (1968)
- Record low
- −7°−22° (1976)
- Heating degree days
- 832
- Cooling degree days
- 0
Lee in December
Highs average 33°1° and lows 18°−8°, with 1.9 in49 mm of precipitation and 8 in19 cm of snow in a typical December.
- Record high
- 68°20° (2012)
- Record low
- −20°−29° (1963)
- Heating degree days
- 1224
- Cooling degree days
- 0