Mount Union weather by month
What a typical year looks like in Mount Union, Iowa: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Mount Pleasant 1 SW, 20 km from Mount Union; records cover 1898–2026.
The year at a glance
- Precipitation a year
- 38.4 in977 mm
- Snow a year
- 25 in63 cm
- Last spring freeze
- Apr 21
- First fall freeze
- Oct 13
- Heating degree days
- 6,380
- Cooling degree days
- 813
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −7°−22° (heating, 99%) and 95°35° (cooling, 1%).
Month by month
Mount Union in January
Highs average 31°0° and lows 13°−11°, with 1.4 in36 mm of precipitation and 7 in18 cm of snow in a typical January.
- Record high
- 68°20° (1909)
- Record low
- −27°−33° (2009)
- Heating degree days
- 1334
- Cooling degree days
- 0
Mount Union in February
Highs average 37°3° and lows 17°−9°, with 1.7 in43 mm of precipitation and 7 in18 cm of snow in a typical February.
- Record high
- 79°26° (2024)
- Record low
- −27°−33° (1905)
- Heating degree days
- 1076
- Cooling degree days
- 0
Mount Union in March
Highs average 49°10° and lows 27°−3°, with 2.3 in59 mm of precipitation and 2.8 in7.1 cm of snow in a typical March.
- Record high
- 90°32° (2026)
- Record low
- −15°−26° (1960)
- Heating degree days
- 835
- Cooling degree days
- 1
Mount Union in April
Highs average 63°17° and lows 38°3°, with 3.9 in99 mm of precipitation and 1.1 in2.8 cm of snow in a typical April.
- Record high
- 92°33° (1930)
- Record low
- 9°−13° (1982)
- Heating degree days
- 453
- Cooling degree days
- 7
Mount Union in May
Highs average 72°22° and lows 49°9°, with 5.1 in128 mm of precipitation in a typical May.
- Record high
- 102°39° (1934)
- Record low
- 23°−5° (1931)
- Heating degree days
- 188
- Cooling degree days
- 48
Mount Union in June
Highs average 81°27° and lows 58°15°, with 5.1 in130 mm of precipitation in a typical June.
- Record high
- 102°39° (1931)
- Record low
- 36°2° (1902)
- Heating degree days
- 27
- Cooling degree days
- 165
Mount Union in July
Highs average 85°29° and lows 62°17°, with 4.4 in111 mm of precipitation in a typical July.
- Record high
- 114°46° (1936)
- Record low
- 43°6° (1928)
- Heating degree days
- 4
- Cooling degree days
- 267
Mount Union in August
Highs average 83°29° and lows 60°16°, with 3.9 in98 mm of precipitation in a typical August.
- Record high
- 108°42° (1934)
- Record low
- 38°3° (1915)
- Heating degree days
- 11
- Cooling degree days
- 220
Mount Union in September
Highs average 77°25° and lows 52°11°, with 4.1 in105 mm of precipitation in a typical September.
- Record high
- 101°38° (1899)
- Record low
- 23°−5° (1942)
- Heating degree days
- 108
- Cooling degree days
- 93
Mount Union in OctoberThis month
Highs average 64°18° and lows 41°5°, with 2.9 in74 mm of precipitation in a typical October.
- Record high
- 96°36° (1953)
- Record low
- 9°−13° (1925)
- Heating degree days
- 403
- Cooling degree days
- 12
Mount Union in November
Highs average 50°10° and lows 29°−2°, with 2.1 in52 mm of precipitation and 0.5 in1.3 cm of snow in a typical November.
- Record high
- 81°27° (1933)
- Record low
- −5°−21° (1976)
- Heating degree days
- 779
- Cooling degree days
- 0
Mount Union in December
Highs average 37°3° and lows 18°−8°, with 1.7 in43 mm of precipitation and 6 in15 cm of snow in a typical December.
- Record high
- 74°23° (2021)
- Record low
- −25°−32° (1989)
- Heating degree days
- 1162
- Cooling degree days
- 0