Ironwood weather by month
What a typical year looks like in Ironwood, Michigan: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Ironwood, 3 km from Ironwood; records cover 1901–2026.
The year at a glance
- Precipitation a year
- 37.4 in949 mm
- Snow a year
- 186 in471 cm
- Last spring freeze
- May 21
- First fall freeze
- Sep 29
- Heating degree days
- 9,263
- Cooling degree days
- 255
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −20°−29° (heating, 99%) and 87°31° (cooling, 1%).
Month by month
Ironwood in January
Highs average 20°−7° and lows 4°−16°, with 2 in50 mm of precipitation and 43 in109 cm of snow in a typical January.
- Record high
- 55°13° (1981)
- Record low
- −41° (1982)
- Heating degree days
- 1643
- Cooling degree days
- 0
Ironwood in February
Highs average 25°−4° and lows 5°−15°, with 1.5 in37 mm of precipitation and 31 in78 cm of snow in a typical February.
- Record high
- 62°17° (1976)
- Record low
- −41° (1967)
- Heating degree days
- 1414
- Cooling degree days
- 0
Ironwood in March
Highs average 36°2° and lows 14°−10°, with 2 in52 mm of precipitation and 24 in61 cm of snow in a typical March.
- Record high
- 79°26° (1946)
- Record low
- −34°−37° (1984)
- Heating degree days
- 1238
- Cooling degree days
- 0
Ironwood in April
Highs average 48°9° and lows 28°−2°, with 3.1 in80 mm of precipitation and 12 in30 cm of snow in a typical April.
- Record high
- 88°31° (1970)
- Record low
- −12°−24° (1982)
- Heating degree days
- 809
- Cooling degree days
- 0
Ironwood in May
Highs average 63°17° and lows 41°5°, with 3.8 in95 mm of precipitation and 1.9 in4.8 cm of snow in a typical May.
- Record high
- 100°38° (1934)
- Record low
- 16°−9° (1907)
- Heating degree days
- 419
- Cooling degree days
- 13
Ironwood in June
Highs average 72°22° and lows 51°11°, with 3.9 in99 mm of precipitation in a typical June.
- Record high
- 99°37° (1931)
- Record low
- 25°−4° (1945)
- Heating degree days
- 148
- Cooling degree days
- 51
Ironwood in July
Highs average 76°25° and lows 56°13°, with 4.2 in107 mm of precipitation in a typical July.
- Record high
- 104°40° (1936)
- Record low
- 31°−1° (1907)
- Heating degree days
- 66
- Cooling degree days
- 100
Ironwood in August
Highs average 75°24° and lows 54°12°, with 3.8 in96 mm of precipitation in a typical August.
- Record high
- 101°38° (1947)
- Record low
- 30°−1° (1976)
- Heating degree days
- 91
- Cooling degree days
- 67
Ironwood in September
Highs average 67°19° and lows 46°8°, with 3.8 in98 mm of precipitation and 0.3 in0.8 cm of snow in a typical September.
- Record high
- 99°37° (1906)
- Record low
- 21°−6° (1907)
- Heating degree days
- 280
- Cooling degree days
- 23
Ironwood in OctoberThis month
Highs average 53°11° and lows 35°2°, with 4.1 in103 mm of precipitation and 6 in15 cm of snow in a typical October.
- Record high
- 86°30° (1922)
- Record low
- 2°−17° (1925)
- Heating degree days
- 660
- Cooling degree days
- 1
Ironwood in November
Highs average 37°3° and lows 23°−5°, with 2.9 in73 mm of precipitation and 24 in61 cm of snow in a typical November.
- Record high
- 80°27° (1950)
- Record low
- −18°−28° (1976)
- Heating degree days
- 1047
- Cooling degree days
- 0
Ironwood in December
Highs average 25°−4° and lows 11°−12°, with 2.4 in60 mm of precipitation and 44 in111 cm of snow in a typical December.
- Record high
- 59°15° (1998)
- Record low
- −36°−38° (1983)
- Heating degree days
- 1448
- Cooling degree days
- 0