St. Ansgar weather by month
What a typical year looks like in St. Ansgar, Iowa: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Osage, 13 km from St. Ansgar; records cover 1894–2026.
The year at a glance
- Precipitation a year
- 37.6 in955 mm
- Snow a year
- 40 in101 cm
- Last spring freeze
- Apr 29
- First fall freeze
- Oct 6
- Heating degree days
- 7,745
- Cooling degree days
- 592
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −13°−25° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
St. Ansgar in January
Highs average 23°−5° and lows 6°−14°, with 1.2 in30 mm of precipitation and 10 in25 cm of snow in a typical January.
- Record high
- 61°16° (2002)
- Record low
- −35°−37° (1912)
- Heating degree days
- 1559
- Cooling degree days
- 0
St. Ansgar in February
Highs average 28°−2° and lows 10°−12°, with 1.3 in32 mm of precipitation and 9 in23 cm of snow in a typical February.
- Record high
- 73°23° (2024)
- Record low
- −35°−37° (1996)
- Heating degree days
- 1285
- Cooling degree days
- 0
St. Ansgar in March
Highs average 41°5° and lows 23°−5°, with 1.9 in49 mm of precipitation and 6 in16 cm of snow in a typical March.
- Record high
- 84°29° (1910)
- Record low
- −27°−33° (1962)
- Heating degree days
- 1026
- Cooling degree days
- 0
St. Ansgar in April
Highs average 56°13° and lows 35°2°, with 4 in102 mm of precipitation and 2.2 in5.6 cm of snow in a typical April.
- Record high
- 92°33° (1980)
- Record low
- 6°−14° (1982)
- Heating degree days
- 586
- Cooling degree days
- 2
St. Ansgar in May
Highs average 68°20° and lows 47°9°, with 5.2 in132 mm of precipitation and 0.4 in1 cm of snow in a typical May.
- Record high
- 105°41° (1934)
- Record low
- 21°−6° (1945)
- Heating degree days
- 256
- Cooling degree days
- 33
St. Ansgar in June
Highs average 78°26° and lows 58°15°, with 5.6 in141 mm of precipitation in a typical June.
- Record high
- 105°41° (1934)
- Record low
- 34°1° (1901)
- Heating degree days
- 45
- Cooling degree days
- 136
St. Ansgar in July
Highs average 81°27° and lows 62°17°, with 5 in126 mm of precipitation in a typical July.
- Record high
- 107°42° (1936)
- Record low
- 42°6° (1899)
- Heating degree days
- 9
- Cooling degree days
- 212
St. Ansgar in August
Highs average 79°26° and lows 59°15°, with 4 in100 mm of precipitation in a typical August.
- Record high
- 103°39° (1930)
- Record low
- 37°3° (1907)
- Heating degree days
- 23
- Cooling degree days
- 148
St. Ansgar in September
Highs average 73°23° and lows 50°10°, with 3.5 in89 mm of precipitation in a typical September.
- Record high
- 101°38° (1913)
- Record low
- 20°−7° (1899)
- Heating degree days
- 156
- Cooling degree days
- 55
St. Ansgar in OctoberThis month
Highs average 60°15° and lows 38°3°, with 2.7 in69 mm of precipitation and 0.2 in0.5 cm of snow in a typical October.
- Record high
- 93°34° (1963)
- Record low
- −4°−20° (1925)
- Heating degree days
- 514
- Cooling degree days
- 6
St. Ansgar in November
Highs average 43°6° and lows 25°−4°, with 1.8 in47 mm of precipitation and 1.9 in4.8 cm of snow in a typical November.
- Record high
- 78°26° (2006)
- Record low
- −15°−26° (1977)
- Heating degree days
- 934
- Cooling degree days
- 0
St. Ansgar in December
Highs average 29°−2° and lows 14°−10°, with 1.5 in38 mm of precipitation and 10 in24 cm of snow in a typical December.
- Record high
- 68°20° (2001)
- Record low
- −30°−34° (1950)
- Heating degree days
- 1352
- Cooling degree days
- 0