St. Charles weather by month
What a typical year looks like in St. Charles, Michigan: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Saginaw #3, 20 km from St. Charles; records cover 2001–2026.
The year at a glance
- Precipitation a year
- 34 in863 mm
- Snow a year
- 41 in103 cm
- Last spring freeze
- Apr 30
- First fall freeze
- Oct 18
- Heating degree days
- 6,750
- Cooling degree days
- 690
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −5°−21° (heating, 99%) and 94°34° (cooling, 1%).
Month by month
St. Charles in January
Highs average 30°−1° and lows 16°−9°, with 2.3 in57 mm of precipitation and 11 in29 cm of snow in a typical January.
- Record high
- 60°16° (2008)
- Record low
- −14°−26° (2014)
- Heating degree days
- 1303
- Cooling degree days
- 0
St. Charles in February
Highs average 33°0° and lows 17°−8°, with 1.9 in49 mm of precipitation and 9 in23 cm of snow in a typical February.
- Record high
- 74°23° (2024)
- Record low
- −20°−29° (2015)
- Heating degree days
- 1127
- Cooling degree days
- 0
St. Charles in March
Highs average 43°6° and lows 25°−4°, with 2 in51 mm of precipitation and 5 in13 cm of snow in a typical March.
- Record high
- 87°31° (2012)
- Record low
- −9°−23° (2014)
- Heating degree days
- 960
- Cooling degree days
- 1
St. Charles in April
Highs average 56°14° and lows 35°2°, with 3.6 in92 mm of precipitation and 1.3 in3.3 cm of snow in a typical April.
- Record high
- 89°32° (2002)
- Record low
- 12°−11° (2003)
- Heating degree days
- 578
- Cooling degree days
- 3
St. Charles in May
Highs average 69°21° and lows 47°9°, with 3.6 in91 mm of precipitation in a typical May.
- Record high
- 95°35° (2006)
- Record low
- 28°−2° (2008)
- Heating degree days
- 248
- Cooling degree days
- 38
St. Charles in June
Highs average 79°26° and lows 58°14°, with 3.5 in88 mm of precipitation in a typical June.
- Record high
- 97°36° (2012)
- Record low
- 37°3° (2003)
- Heating degree days
- 44
- Cooling degree days
- 140
St. Charles in July
Highs average 83°28° and lows 62°16°, with 3.4 in85 mm of precipitation in a typical July.
- Record high
- 99°37° (2012)
- Record low
- 47°8° (2007)
- Heating degree days
- 8
- Cooling degree days
- 234
St. Charles in August
Highs average 82°28° and lows 60°16°, with 3.5 in89 mm of precipitation in a typical August.
- Record high
- 98°37° (2003)
- Record low
- 45°7° (2004)
- Heating degree days
- 12
- Cooling degree days
- 198
St. Charles in September
Highs average 74°24° and lows 52°11°, with 2.7 in68 mm of precipitation in a typical September.
- Record high
- 95°35° (2013)
- Record low
- 35°2° (2002)
- Heating degree days
- 124
- Cooling degree days
- 69
St. Charles in OctoberThis month
Highs average 61°16° and lows 41°5°, with 2.9 in74 mm of precipitation and 0.2 in0.5 cm of snow in a typical October.
- Record high
- 90°32° (2007)
- Record low
- 25°−4° (2002)
- Heating degree days
- 442
- Cooling degree days
- 7
St. Charles in November
Highs average 46°8° and lows 31°0°, with 2.6 in67 mm of precipitation and 2.3 in5.8 cm of snow in a typical November.
- Record high
- 77°25° (2020)
- Record low
- 8°−13° (2019)
- Heating degree days
- 788
- Cooling degree days
- 0
St. Charles in December
Highs average 35°2° and lows 23°−5°, with 2 in52 mm of precipitation and 11 in29 cm of snow in a typical December.
- Record high
- 63°17° (2012)
- Record low
- −5°−21° (2017)
- Heating degree days
- 1116
- Cooling degree days
- 0