Chatham weather by month
What a typical year looks like in Chatham, Michigan: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Chatham Experiment Farm 2, 1 km from Chatham; records cover 1987–2026.
The year at a glance
- Precipitation a year
- 35.1 in891 mm
- Snow a year
- 164 in417 cm
- Last spring freeze
- Jun 1
- First fall freeze
- Sep 23
- Heating degree days
- 8,818
- Cooling degree days
- 254
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −15°−26° (heating, 99%) and 90°32° (cooling, 1%).
Month by month
Chatham in January
Highs average 25°−4° and lows 8°−13°, with 2 in52 mm of precipitation and 46 in116 cm of snow in a typical January.
- Record high
- 50°10° (2002)
- Record low
- −26°−32° (2009)
- Heating degree days
- 1511
- Cooling degree days
- 0
Chatham in February
Highs average 27°−3° and lows 7°−14°, with 1.5 in39 mm of precipitation and 30 in75 cm of snow in a typical February.
- Record high
- 60°16° (2017)
- Record low
- −32°−36° (2014)
- Heating degree days
- 1340
- Cooling degree days
- 0
Chatham in March
Highs average 37°3° and lows 15°−9°, with 1.7 in43 mm of precipitation and 19 in47 cm of snow in a typical March.
- Record high
- 82°28° (2012)
- Record low
- −34°−37° (2003)
- Heating degree days
- 1204
- Cooling degree days
- 0
Chatham in April
Highs average 48°9° and lows 27°−3°, with 2.4 in62 mm of precipitation and 12 in30 cm of snow in a typical April.
- Record high
- 89°32° (1990)
- Record low
- −6°−21° (2016)
- Heating degree days
- 816
- Cooling degree days
- 0
Chatham in May
Highs average 63°17° and lows 39°4°, with 3.3 in83 mm of precipitation and 0.6 in1.5 cm of snow in a typical May.
- Record high
- 93°34° (2010)
- Record low
- 13°−11° (2008)
- Heating degree days
- 446
- Cooling degree days
- 10
Chatham in June
Highs average 73°23° and lows 48°9°, with 3.4 in86 mm of precipitation in a typical June.
- Record high
- 99°37° (1995)
- Record low
- 22°−6° (1998)
- Heating degree days
- 171
- Cooling degree days
- 46
Chatham in July
Highs average 78°26° and lows 54°12°, with 3.6 in91 mm of precipitation in a typical July.
- Record high
- 101°38° (1988)
- Record low
- 31°−1° (2000)
- Heating degree days
- 74
- Cooling degree days
- 99
Chatham in August
Highs average 77°25° and lows 53°12°, with 3 in77 mm of precipitation in a typical August.
- Record high
- 99°37° (2001)
- Record low
- 31°−1° (2000)
- Heating degree days
- 86
- Cooling degree days
- 74
Chatham in September
Highs average 69°20° and lows 46°8°, with 4.3 in108 mm of precipitation in a typical September.
- Record high
- 93°34° (2002)
- Record low
- 22°−6° (2000)
- Heating degree days
- 249
- Cooling degree days
- 24
Chatham in OctoberThis month
Highs average 55°13° and lows 35°2°, with 4.7 in120 mm of precipitation and 2.5 in6.4 cm of snow in a typical October.
- Record high
- 87°31° (1992)
- Record low
- 14°−10° (2020)
- Heating degree days
- 624
- Cooling degree days
- 1
Chatham in November
Highs average 40°5° and lows 25°−4°, with 2.9 in73 mm of precipitation and 19 in48 cm of snow in a typical November.
- Record high
- 77°25° (2020)
- Record low
- −16°−27° (2005)
- Heating degree days
- 969
- Cooling degree days
- 0
Chatham in December
Highs average 30°−1° and lows 15°−10°, with 2.3 in58 mm of precipitation and 36 in92 cm of snow in a typical December.
- Record high
- 59°15° (1998)
- Record low
- −31°−35° (2004)
- Heating degree days
- 1328
- Cooling degree days
- 0