Lake Mills weather by month
What a typical year looks like in Lake Mills, Iowa: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Forest City 2 Nne, 17 km from Lake Mills; records cover 1894–2026.
The year at a glance
- Precipitation a year
- 35.9 in912 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 27
- First fall freeze
- Oct 6
- Heating degree days
- 7,857
- Cooling degree days
- 588
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −14°−26° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
Lake Mills in January
Highs average 23°−5° and lows 6°−15°, with 1.2 in29 mm of precipitation in a typical January.
- Record high
- 64°18° (1944)
- Record low
- −36°−38° (1912)
- Heating degree days
- 1576
- Cooling degree days
- 0
Lake Mills in February
Highs average 27°−3° and lows 10°−12°, with 1.3 in34 mm of precipitation in a typical February.
- Record high
- 72°22° (2024)
- Record low
- −33°−36° (1899)
- Heating degree days
- 1308
- Cooling degree days
- 0
Lake Mills in March
Highs average 40°5° and lows 23°−5°, with 1.9 in49 mm of precipitation in a typical March.
- Record high
- 86°30° (1895)
- Record low
- −26°−32° (1962)
- Heating degree days
- 1040
- Cooling degree days
- 0
Lake Mills in April
Highs average 56°13° and lows 34°1°, with 3.9 in99 mm of precipitation in a typical April.
- Record high
- 94°34° (1910)
- Record low
- 6°−14° (1982)
- Heating degree days
- 595
- Cooling degree days
- 2
Lake Mills in May
Highs average 69°20° and lows 47°8°, with 4.8 in123 mm of precipitation in a typical May.
- Record high
- 106°41° (1934)
- Record low
- 22°−6° (1907)
- Heating degree days
- 255
- Cooling degree days
- 33
Lake Mills in June
Highs average 78°26° and lows 58°14°, with 5.5 in140 mm of precipitation in a typical June.
- Record high
- 104°40° (1934)
- Record low
- 34°1° (1901)
- Heating degree days
- 44
- Cooling degree days
- 135
Lake Mills in July
Highs average 81°27° and lows 62°16°, with 4.6 in117 mm of precipitation in a typical July.
- Record high
- 108°42° (1936)
- Record low
- 38°3° (1895)
- Heating degree days
- 10
- Cooling degree days
- 209
Lake Mills in August
Highs average 79°26° and lows 59°15°, with 3.8 in96 mm of precipitation in a typical August.
- Record high
- 105°41° (1930)
- Record low
- 35°2° (1915)
- Heating degree days
- 27
- Cooling degree days
- 147
Lake Mills in September
Highs average 73°23° and lows 50°10°, with 3.5 in88 mm of precipitation in a typical September.
- Record high
- 101°38° (1922)
- Record low
- 20°−7° (1942)
- Heating degree days
- 161
- Cooling degree days
- 56
Lake Mills in OctoberThis month
Highs average 60°15° and lows 37°3°, with 2.6 in66 mm of precipitation in a typical October.
- Record high
- 97°36° (1963)
- Record low
- −3°−19° (1925)
- Heating degree days
- 520
- Cooling degree days
- 6
Lake Mills in November
Highs average 43°6° and lows 24°−4°, with 1.6 in41 mm of precipitation in a typical November.
- Record high
- 80°27° (2006)
- Record low
- −13°−25° (1977)
- Heating degree days
- 948
- Cooling degree days
- 0
Lake Mills in December
Highs average 29°−2° and lows 13°−11°, with 1.2 in31 mm of precipitation in a typical December.
- Record high
- 69°21° (1998)
- Record low
- −28°−33° (1901)
- Heating degree days
- 1373
- Cooling degree days
- 0