Anamosa weather by month
What a typical year looks like in Anamosa, Iowa: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Anamosa 3 Ssw, 4 km from Anamosa; records cover 2011–2026.
The year at a glance
- Precipitation a year
- 39.3 in998 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 29
- First fall freeze
- Oct 13
- Heating degree days
- 6,826
- Cooling degree days
- 650
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −10°−23° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
Anamosa in January
Highs average 29°−2° and lows 11°−11°, with 1.3 in32 mm of precipitation in a typical January.
- Record high
- 59°15° (2012)
- Record low
- −27°−33° (2019)
- Heating degree days
- 1396
- Cooling degree days
- 0
Anamosa in February
Highs average 33°0° and lows 15°−9°, with 1.5 in37 mm of precipitation in a typical February.
- Record high
- 74°23° (2017)
- Record low
- −27°−33° (2019)
- Heating degree days
- 1145
- Cooling degree days
- 0
Anamosa in March
Highs average 45°7° and lows 26°−3°, with 2.2 in56 mm of precipitation in a typical March.
- Record high
- 86°30° (2026)
- Record low
- −15°−26° (2015)
- Heating degree days
- 911
- Cooling degree days
- 1
Anamosa in April
Highs average 59°15° and lows 37°3°, with 4 in102 mm of precipitation in a typical April.
- Record high
- 83°28° (2024)
- Record low
- 15°−9° (2018)
- Heating degree days
- 509
- Cooling degree days
- 2
Anamosa in May
Highs average 70°21° and lows 48°9°, with 4.7 in119 mm of precipitation in a typical May.
- Record high
- 97°36° (2018)
- Record low
- 27°−3° (2020)
- Heating degree days
- 215
- Cooling degree days
- 34
Anamosa in June
Highs average 80°27° and lows 58°14°, with 5.5 in140 mm of precipitation in a typical June.
- Record high
- 94°34° (2021)
- Record low
- 42°6° (2015)
- Heating degree days
- 26
- Cooling degree days
- 142
Anamosa in July
Highs average 83°28° and lows 62°16°, with 4.5 in115 mm of precipitation in a typical July.
- Record high
- 101°38° (2012)
- Record low
- 47°8° (2013)
- Heating degree days
- 6
- Cooling degree days
- 223
Anamosa in August
Highs average 81°27° and lows 59°15°, with 4.8 in122 mm of precipitation in a typical August.
- Record high
- 100°38° (2023)
- Record low
- 46°8° (2025)
- Heating degree days
- 14
- Cooling degree days
- 174
Anamosa in September
Highs average 75°24° and lows 51°10°, with 3.7 in94 mm of precipitation in a typical September.
- Record high
- 97°36° (2013)
- Record low
- 30°−1° (2012)
- Heating degree days
- 129
- Cooling degree days
- 68
Anamosa in OctoberThis month
Highs average 62°17° and lows 40°4°, with 3.1 in79 mm of precipitation in a typical October.
- Record high
- 92°33° (2023)
- Record low
- 21°−6° (2022)
- Heating degree days
- 446
- Cooling degree days
- 6
Anamosa in November
Highs average 47°8° and lows 28°−2°, with 2.2 in56 mm of precipitation in a typical November.
- Record high
- 75°24° (2016)
- Record low
- −2°−19° (2019)
- Heating degree days
- 825
- Cooling degree days
- 0
Anamosa in December
Highs average 34°1° and lows 18°−8°, with 1.8 in45 mm of precipitation in a typical December.
- Record high
- 71°22° (2021)
- Record low
- −13°−25° (2013)
- Heating degree days
- 1204
- Cooling degree days
- 0