Copper Harbor weather by month
What a typical year looks like in Copper Harbor, Michigan: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Copper Harbor, 0 km from Copper Harbor; records cover 1998–2026.
The year at a glance
- Precipitation a year
- 26 in661 mm
- Snow a year
- Rare
- Last spring freeze
- May 6
- First fall freeze
- Oct 18
- Heating degree days
- 8,349
- Cooling degree days
- 189
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −2°−19° (heating, 99%) and 85°29° (cooling, 1%).
Month by month
Copper Harbor in January
Highs average 26°−3° and lows 15°−9°, with 1.9 in49 mm of precipitation in a typical January.
- Record high
- 59°15° (1999)
- Record low
- −9°−23° (2026)
- Heating degree days
- 1375
- Cooling degree days
- 0
Copper Harbor in February
Highs average 27°−3° and lows 14°−10°, with 1.1 in27 mm of precipitation in a typical February.
- Record high
- 56°13° (2000)
- Record low
- −16°−27° (2015)
- Heating degree days
- 1250
- Cooling degree days
- 0
Copper Harbor in March
Highs average 35°2° and lows 21°−6°, with 1.2 in31 mm of precipitation in a typical March.
- Record high
- 73°23° (2012)
- Record low
- −21°−29° (2003)
- Heating degree days
- 1149
- Cooling degree days
- 0
Copper Harbor in April
Highs average 45°7° and lows 31°−1°, with 2.2 in57 mm of precipitation in a typical April.
- Record high
- 78°26° (2001)
- Record low
- 6°−14° (2003)
- Heating degree days
- 818
- Cooling degree days
- 0
Copper Harbor in May
Highs average 58°14° and lows 41°5°, with 2.8 in70 mm of precipitation in a typical May.
- Record high
- 88°31° (2009)
- Record low
- 26°−3° (2020)
- Heating degree days
- 493
- Cooling degree days
- 2
Copper Harbor in June
Highs average 67°19° and lows 49°9°, with 2.5 in65 mm of precipitation in a typical June.
- Record high
- 92°33° (2001)
- Record low
- 34°1° (2002)
- Heating degree days
- 236
- Cooling degree days
- 15
Copper Harbor in July
Highs average 72°22° and lows 57°14°, with 2.5 in65 mm of precipitation in a typical July.
- Record high
- 96°36° (2026)
- Record low
- 43°6° (2007)
- Heating degree days
- 85
- Cooling degree days
- 74
Copper Harbor in August
Highs average 72°22° and lows 58°15°, with 2.3 in59 mm of precipitation in a typical August.
- Record high
- 93°34° (2007)
- Record low
- 44°7° (2007)
- Heating degree days
- 66
- Cooling degree days
- 73
Copper Harbor in September
Highs average 65°19° and lows 51°11°, with 3.1 in78 mm of precipitation in a typical September.
- Record high
- 93°34° (2022)
- Record low
- 32°0° (2000)
- Heating degree days
- 224
- Cooling degree days
- 24
Copper Harbor in OctoberThis month
Highs average 52°11° and lows 41°5°, with 2.7 in69 mm of precipitation in a typical October.
- Record high
- 88°31° (2023)
- Record low
- 24°−4° (2013)
- Heating degree days
- 573
- Cooling degree days
- 1
Copper Harbor in November
Highs average 41°5° and lows 30°−1°, with 1.8 in44 mm of precipitation in a typical November.
- Record high
- 70°21° (2008)
- Record low
- 7°−14° (2018)
- Heating degree days
- 880
- Cooling degree days
- 0
Copper Harbor in December
Highs average 31°0° and lows 21°−6°, with 1.9 in48 mm of precipitation in a typical December.
- Record high
- 55°13° (2023)
- Record low
- −6°−21° (2004)
- Heating degree days
- 1200
- Cooling degree days
- 0