Anderson weather by month
What a typical year looks like in Anderson, Iowa: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Shenandoah, 20 km from Anderson; records cover 1918–2026.
The year at a glance
- Precipitation a year
- 36.4 in924 mm
- Snow a year
- 26 in67 cm
- Last spring freeze
- Apr 22
- First fall freeze
- Oct 13
- Heating degree days
- 5,967
- Cooling degree days
- 1,183
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −6°−21° (heating, 99%) and 96°36° (cooling, 1%).
Month by month
Anderson in January
Highs average 33°1° and lows 14°−10°, with 0.92 in23 mm of precipitation and 7 in18 cm of snow in a typical January.
- Record high
- 69°21° (1939)
- Record low
- −26°−32° (1974)
- Heating degree days
- 1285
- Cooling degree days
- 0
Anderson in February
Highs average 39°4° and lows 18°−8°, with 1.2 in31 mm of precipitation and 8 in19 cm of snow in a typical February.
- Record high
- 80°27° (2024)
- Record low
- −29°−34° (1936)
- Heating degree days
- 1026
- Cooling degree days
- 0
Anderson in March
Highs average 52°11° and lows 29°−1°, with 2.1 in52 mm of precipitation and 2.8 in7.1 cm of snow in a typical March.
- Record high
- 94°34° (2026)
- Record low
- −22°−30° (1960)
- Heating degree days
- 763
- Cooling degree days
- 2
Anderson in April
Highs average 64°18° and lows 40°4°, with 3.3 in85 mm of precipitation and 1.2 in3 cm of snow in a typical April.
- Record high
- 94°34° (1989)
- Record low
- 8°−13° (1975)
- Heating degree days
- 408
- Cooling degree days
- 12
Anderson in May
Highs average 74°23° and lows 53°11°, with 6.2 in156 mm of precipitation in a typical May.
- Record high
- 99°37° (1967)
- Record low
- 26°−3° (1961)
- Heating degree days
- 143
- Cooling degree days
- 86
Anderson in June
Highs average 83°29° and lows 63°17°, with 5.5 in140 mm of precipitation in a typical June.
- Record high
- 106°41° (1937)
- Record low
- 36°2° (1946)
- Heating degree days
- 13
- Cooling degree days
- 259
Anderson in July
Highs average 87°31° and lows 67°19°, with 4.4 in111 mm of precipitation in a typical July.
- Record high
- 112°44° (1936)
- Record low
- 41°5° (1971)
- Heating degree days
- 1
- Cooling degree days
- 367
Anderson in August
Highs average 85°30° and lows 64°18°, with 3.8 in96 mm of precipitation in a typical August.
- Record high
- 113°45° (1918)
- Record low
- 38°3° (1950)
- Heating degree days
- 4
- Cooling degree days
- 302
Anderson in September
Highs average 79°26° and lows 55°13°, with 3 in77 mm of precipitation in a typical September.
- Record high
- 105°41° (1939)
- Record low
- 23°−5° (1984)
- Heating degree days
- 82
- Cooling degree days
- 134
Anderson in OctoberThis month
Highs average 66°19° and lows 42°5°, with 2.8 in72 mm of precipitation and 0.6 in1.5 cm of snow in a typical October.
- Record high
- 97°36° (1963)
- Record low
- 15°−9° (1972)
- Heating degree days
- 362
- Cooling degree days
- 20
Anderson in November
Highs average 51°10° and lows 29°−1°, with 1.8 in45 mm of precipitation and 1.5 in3.8 cm of snow in a typical November.
- Record high
- 84°29° (2020)
- Record low
- −8°−22° (1964)
- Heating degree days
- 749
- Cooling degree days
- 1
Anderson in December
Highs average 38°3° and lows 19°−7°, with 1.4 in36 mm of precipitation and 6 in15 cm of snow in a typical December.
- Record high
- 73°23° (1939)
- Record low
- −26°−32° (1983)
- Heating degree days
- 1131
- Cooling degree days
- 0