Allison weather by month
What a typical year looks like in Allison, Iowa: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Allison, 1 km from Allison; records cover 1914–2026.
The year at a glance
- Precipitation a year
- 35.4 in899 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 24
- First fall freeze
- Oct 8
- Heating degree days
- 7,356
- Cooling degree days
- 711
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −13°−25° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Allison in January
Highs average 25°−4° and lows 8°−14°, with 0.94 in24 mm of precipitation in a typical January.
- Record high
- 64°18° (2002)
- Record low
- −30°−34° (1918)
- Heating degree days
- 1511
- Cooling degree days
- 0
Allison in February
Highs average 29°−1° and lows 12°−11°, with 1 in26 mm of precipitation in a typical February.
- Record high
- 75°24° (2024)
- Record low
- −31°−35° (1996)
- Heating degree days
- 1247
- Cooling degree days
- 0
Allison in March
Highs average 43°6° and lows 24°−4°, with 1.8 in45 mm of precipitation in a typical March.
- Record high
- 85°29° (2026)
- Record low
- −25°−32° (1948)
- Heating degree days
- 969
- Cooling degree days
- 0
Allison in April
Highs average 59°15° and lows 36°2°, with 3.8 in97 mm of precipitation in a typical April.
- Record high
- 96°36° (1980)
- Record low
- 5°−15° (1982)
- Heating degree days
- 537
- Cooling degree days
- 3
Allison in May
Highs average 70°21° and lows 49°9°, with 5.1 in130 mm of precipitation in a typical May.
- Record high
- 106°41° (1934)
- Record low
- 25°−4° (1966)
- Heating degree days
- 216
- Cooling degree days
- 43
Allison in June
Highs average 80°27° and lows 59°15°, with 5.5 in139 mm of precipitation in a typical June.
- Record high
- 105°41° (1934)
- Record low
- 36°2° (1945)
- Heating degree days
- 28
- Cooling degree days
- 164
Allison in July
Highs average 83°28° and lows 63°17°, with 4.2 in107 mm of precipitation in a typical July.
- Record high
- 109°43° (1936)
- Record low
- 42°6° (1917)
- Heating degree days
- 5
- Cooling degree days
- 246
Allison in August
Highs average 80°27° and lows 60°16°, with 4 in103 mm of precipitation in a typical August.
- Record high
- 107°42° (1936)
- Record low
- 32°0° (1915)
- Heating degree days
- 16
- Cooling degree days
- 180
Allison in September
Highs average 74°24° and lows 51°11°, with 3.4 in86 mm of precipitation in a typical September.
- Record high
- 101°38° (1939)
- Record low
- 25°−4° (1926)
- Heating degree days
- 135
- Cooling degree days
- 67
Allison in OctoberThis month
Highs average 61°16° and lows 39°4°, with 2.5 in64 mm of precipitation in a typical October.
- Record high
- 96°36° (1963)
- Record low
- 0°−18° (1925)
- Heating degree days
- 472
- Cooling degree days
- 8
Allison in November
Highs average 44°7° and lows 25°−4°, with 1.8 in45 mm of precipitation in a typical November.
- Record high
- 80°27° (1999)
- Record low
- −16°−27° (1977)
- Heating degree days
- 904
- Cooling degree days
- 0
Allison in December
Highs average 31°−1° and lows 15°−10°, with 1.4 in34 mm of precipitation in a typical December.
- Record high
- 70°21° (2021)
- Record low
- −27°−33° (1919)
- Heating degree days
- 1316
- Cooling degree days
- 0