Alleman weather by month
What a typical year looks like in Alleman, Iowa: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Ames 5 SE, 16 km from Alleman; records cover 1978–2026.
The year at a glance
- Precipitation a year
- 38.1 in967 mm
- Snow a year
- 27 in69 cm
- Last spring freeze
- Apr 21
- First fall freeze
- Oct 10
- Heating degree days
- 6,929
- Cooling degree days
- 760
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −11°−24° (heating, 99%) and 94°34° (cooling, 1%).
Month by month
Alleman in January
Highs average 28°−2° and lows 10°−12°, with 0.98 in25 mm of precipitation and 7 in17 cm of snow in a typical January.
- Record high
- 67°19° (2002)
- Record low
- −33°−36° (2009)
- Heating degree days
- 1429
- Cooling degree days
- 0
Alleman in February
Highs average 33°0° and lows 14°−10°, with 1.2 in30 mm of precipitation and 8 in20 cm of snow in a typical February.
- Record high
- 76°24° (2024)
- Record low
- −28°−33° (1996)
- Heating degree days
- 1162
- Cooling degree days
- 0
Alleman in March
Highs average 46°8° and lows 25°−4°, with 2.2 in55 mm of precipitation and 4 in10 cm of snow in a typical March.
- Record high
- 92°33° (2026)
- Record low
- −14°−26° (2014)
- Heating degree days
- 909
- Cooling degree days
- 0
Alleman in April
Highs average 60°16° and lows 36°2°, with 3.8 in97 mm of precipitation and 0.7 in1.8 cm of snow in a typical April.
- Record high
- 89°32° (2002)
- Record low
- 12°−11° (2018)
- Heating degree days
- 511
- Cooling degree days
- 4
Alleman in May
Highs average 71°22° and lows 49°9°, with 5.3 in135 mm of precipitation in a typical May.
- Record high
- 97°36° (2018)
- Record low
- 25°−4° (2005)
- Heating degree days
- 209
- Cooling degree days
- 45
Alleman in June
Highs average 80°27° and lows 59°15°, with 5.4 in137 mm of precipitation in a typical June.
- Record high
- 100°38° (2021)
- Record low
- 42°6° (1998)
- Heating degree days
- 28
- Cooling degree days
- 170
Alleman in July
Highs average 84°29° and lows 63°17°, with 4.5 in115 mm of precipitation in a typical July.
- Record high
- 102°39° (2012)
- Record low
- 47°8° (1996)
- Heating degree days
- 5
- Cooling degree days
- 260
Alleman in August
Highs average 82°28° and lows 60°16°, with 4.7 in120 mm of precipitation in a typical August.
- Record high
- 100°38° (2013)
- Record low
- 44°7° (2004)
- Heating degree days
- 14
- Cooling degree days
- 195
Alleman in September
Highs average 76°24° and lows 51°11°, with 3.8 in98 mm of precipitation in a typical September.
- Record high
- 99°37° (2000)
- Record low
- 29°−2° (2003)
- Heating degree days
- 122
- Cooling degree days
- 76
Alleman in OctoberThis month
Highs average 63°17° and lows 39°4°, with 2.7 in67 mm of precipitation and 0.4 in1 cm of snow in a typical October.
- Record high
- 95°35° (1997)
- Record low
- 15°−9° (1997)
- Heating degree days
- 447
- Cooling degree days
- 10
Alleman in November
Highs average 47°8° and lows 27°−3°, with 2 in51 mm of precipitation and 1.5 in3.8 cm of snow in a typical November.
- Record high
- 81°27° (1999)
- Record low
- −5°−21° (2019)
- Heating degree days
- 848
- Cooling degree days
- 0
Alleman in December
Highs average 34°1° and lows 16°−9°, with 1.5 in37 mm of precipitation and 7 in17 cm of snow in a typical December.
- Record high
- 73°23° (2021)
- Record low
- −19°−28° (2013)
- Heating degree days
- 1245
- Cooling degree days
- 0