Ironton weather by month
What a typical year looks like in Ironton, Wisconsin: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at REEDSBURG WWTP, 12 km from Ironton; records cover 1893–2026.
The year at a glance
- Precipitation a year
- 39.6 in1005 mm
- Snow a year
- 44 in112 cm
- Last spring freeze
- May 3
- First fall freeze
- Oct 6
- Heating degree days
- 7,376
- 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 −13°−25° (heating, 99%) and 91°33° (cooling, 1%).
Month by month
Ironton in January
Highs average 27°−3° and lows 8°−13°, with 1.5 in38 mm of precipitation and 10 in25 cm of snow in a typical January.
- Record high
- 60°16° (2025)
- Record low
- −42°−41° (1951)
- Heating degree days
- 1474
- Cooling degree days
- 0
Ironton in February
Highs average 32°0° and lows 12°−11°, with 1.5 in39 mm of precipitation and 15 in38 cm of snow in a typical February.
- Record high
- 72°22° (2024)
- Record low
- −40° (1918)
- Heating degree days
- 1212
- Cooling degree days
- 0
Ironton in March
Highs average 44°7° and lows 23°−5°, with 2.2 in56 mm of precipitation and 5 in13 cm of snow in a typical March.
- Record high
- 85°29° (1986)
- Record low
- −34°−37° (1962)
- Heating degree days
- 971
- Cooling degree days
- 1
Ironton in April
Highs average 57°14° and lows 35°2°, with 3.8 in98 mm of precipitation and 2.7 in6.9 cm of snow in a typical April.
- Record high
- 95°35° (1980)
- Record low
- 2°−17° (1982)
- Heating degree days
- 572
- Cooling degree days
- 2
Ironton in May
Highs average 69°21° and lows 47°8°, with 4.3 in109 mm of precipitation in a typical May.
- Record high
- 94°34° (2018)
- Record low
- 23°−5° (1966)
- Heating degree days
- 252
- Cooling degree days
- 33
Ironton in June
Highs average 79°26° and lows 57°14°, with 5.4 in137 mm of precipitation in a typical June.
- Record high
- 103°39° (1988)
- Record low
- 34°1° (1956)
- Heating degree days
- 46
- Cooling degree days
- 124
Ironton in July
Highs average 82°28° and lows 61°16°, with 5.3 in134 mm of precipitation in a typical July.
- Record high
- 104°40° (1988)
- Record low
- 41°5° (1945)
- Heating degree days
- 11
- Cooling degree days
- 214
Ironton in August
Highs average 80°27° and lows 58°15°, with 4.7 in120 mm of precipitation in a typical August.
- Record high
- 103°39° (1988)
- Record low
- 34°1° (1915)
- Heating degree days
- 25
- Cooling degree days
- 156
Ironton in September
Highs average 73°23° and lows 50°10°, with 3.6 in90 mm of precipitation in a typical September.
- Record high
- 98°37° (1955)
- Record low
- 24°−4° (1949)
- Heating degree days
- 164
- Cooling degree days
- 53
Ironton in OctoberThis month
Highs average 60°16° and lows 38°3°, with 3.1 in78 mm of precipitation and 0.4 in1 cm of snow in a typical October.
- Record high
- 91°33° (1976)
- Record low
- 9°−13° (1988)
- Heating degree days
- 508
- Cooling degree days
- 5
Ironton in November
Highs average 45°7° and lows 27°−3°, with 2.2 in55 mm of precipitation and 1.7 in4.3 cm of snow in a typical November.
- Record high
- 76°24° (1964)
- Record low
- −12°−24° (1947)
- Heating degree days
- 870
- Cooling degree days
- 0
Ironton in December
Highs average 33°0° and lows 15°−9°, with 2 in51 mm of precipitation and 9 in24 cm of snow in a typical December.
- Record high
- 66°19° (2021)
- Record low
- −27°−33° (1989)
- Heating degree days
- 1271
- Cooling degree days
- 0