Morrison weather by month
What a typical year looks like in Morrison, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Morrison, 2 km from Morrison; records cover 1895–2026.
The year at a glance
- Precipitation a year
- 38.3 in972 mm
- Snow a year
- 32 in80 cm
- Last spring freeze
- Apr 25
- First fall freeze
- Oct 10
- Heating degree days
- 6,746
- Cooling degree days
- 704
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 94°34° (cooling, 1%).
Month by month
Morrison in January
Highs average 29°−2° and lows 12°−11°, with 1.5 in38 mm of precipitation and 10 in26 cm of snow in a typical January.
- Record high
- 65°18° (1897)
- Record low
- −35°−37° (2019)
- Heating degree days
- 1381
- Cooling degree days
- 0
Morrison in February
Highs average 34°1° and lows 16°−9°, with 1.7 in42 mm of precipitation and 8 in19 cm of snow in a typical February.
- Record high
- 77°25° (2024)
- Record low
- −35°−37° (2019)
- Heating degree days
- 1130
- Cooling degree days
- 0
Morrison in March
Highs average 46°8° and lows 27°−3°, with 2.5 in64 mm of precipitation and 4 in9 cm of snow in a typical March.
- Record high
- 86°30° (1986)
- Record low
- −17°−27° (2014)
- Heating degree days
- 885
- Cooling degree days
- 0
Morrison in April
Highs average 60°15° and lows 37°3°, with 3.8 in98 mm of precipitation and 0.8 in2 cm of snow in a typical April.
- Record high
- 99°37° (1926)
- Record low
- 8°−13° (1982)
- Heating degree days
- 507
- Cooling degree days
- 3
Morrison in May
Highs average 71°22° and lows 49°9°, with 4.7 in120 mm of precipitation in a typical May.
- Record high
- 105°41° (1934)
- Record low
- 23°−5° (2005)
- Heating degree days
- 206
- Cooling degree days
- 45
Morrison in June
Highs average 80°27° and lows 59°15°, with 4.9 in125 mm of precipitation in a typical June.
- Record high
- 106°41° (1934)
- Record low
- 35°2° (1972)
- Heating degree days
- 32
- Cooling degree days
- 160
Morrison in July
Highs average 83°28° and lows 62°17°, with 4.2 in106 mm of precipitation in a typical July.
- Record high
- 112°44° (1936)
- Record low
- 41°5° (1904)
- Heating degree days
- 6
- Cooling degree days
- 240
Morrison in August
Highs average 81°27° and lows 60°15°, with 4.3 in110 mm of precipitation in a typical August.
- Record high
- 105°41° (1936)
- Record low
- 36°2° (1915)
- Heating degree days
- 14
- Cooling degree days
- 181
Morrison in September
Highs average 75°24° and lows 51°11°, with 3.4 in85 mm of precipitation in a typical September.
- Record high
- 103°39° (1899)
- Record low
- 19°−7° (1899)
- Heating degree days
- 125
- Cooling degree days
- 68
Morrison in OctoberThis month
Highs average 62°17° and lows 39°4°, with 2.8 in70 mm of precipitation and 0.1 in0.3 cm of snow in a typical October.
- Record high
- 93°34° (1963)
- Record low
- 9°−13° (1925)
- Heating degree days
- 447
- Cooling degree days
- 7
Morrison in November
Highs average 47°8° and lows 28°−2°, with 2.5 in63 mm of precipitation and 2.7 in6.9 cm of snow in a typical November.
- Record high
- 80°27° (1933)
- Record low
- −7°−22° (1976)
- Heating degree days
- 816
- Cooling degree days
- 0
Morrison in December
Highs average 35°1° and lows 18°−8°, with 2 in51 mm of precipitation and 6 in16 cm of snow in a typical December.
- Record high
- 73°23° (2021)
- Record low
- −28°−33° (1914)
- Heating degree days
- 1197
- Cooling degree days
- 0