Bay City weather by month
What a typical year looks like in Bay City, Michigan: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Saginaw Mbs International Airport, 17 km from Bay City; records cover 1912–2026.
The year at a glance
- Precipitation a year
- 32.1 in816 mm
- Snow a year
- 49 in124 cm
- Last spring freeze
- Apr 27
- First fall freeze
- Oct 16
- Heating degree days
- 6,781
- Cooling degree days
- 632
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −3°−19° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
Bay City in January
Highs average 30°−1° and lows 16°−9°, with 1.9 in49 mm of precipitation and 14 in35 cm of snow in a typical January.
- Record high
- 62°17° (1916)
- Record low
- −22°−30° (1994)
- Heating degree days
- 1303
- Cooling degree days
- 0
Bay City in February
Highs average 32°0° and lows 17°−8°, with 1.8 in45 mm of precipitation and 11 in29 cm of snow in a typical February.
- Record high
- 74°23° (2024)
- Record low
- −23°−31° (1918)
- Heating degree days
- 1132
- Cooling degree days
- 0
Bay City in March
Highs average 42°6° and lows 26°−4°, with 2 in51 mm of precipitation and 6 in15 cm of snow in a typical March.
- Record high
- 87°31° (2012)
- Record low
- −12°−24° (1962)
- Heating degree days
- 962
- Cooling degree days
- 1
Bay City in April
Highs average 56°13° and lows 36°2°, with 3.2 in81 mm of precipitation and 2.4 in6.1 cm of snow in a typical April.
- Record high
- 88°31° (1915)
- Record low
- 8°−13° (1923)
- Heating degree days
- 574
- Cooling degree days
- 2
Bay City in May
Highs average 69°20° and lows 48°9°, with 3.4 in87 mm of precipitation in a typical May.
- Record high
- 95°35° (1919)
- Record low
- 24°−4° (1923)
- Heating degree days
- 253
- Cooling degree days
- 41
Bay City in June
Highs average 79°26° and lows 58°14°, with 3.3 in83 mm of precipitation in a typical June.
- Record high
- 104°40° (1934)
- Record low
- 33°1° (1941)
- Heating degree days
- 47
- Cooling degree days
- 140
Bay City in July
Highs average 82°28° and lows 61°16°, with 2.8 in72 mm of precipitation in a typical July.
- Record high
- 111°44° (1936)
- Record low
- 39°4° (2001)
- Heating degree days
- 9
- Cooling degree days
- 216
Bay City in August
Highs average 80°27° and lows 59°15°, with 3.9 in98 mm of precipitation in a typical August.
- Record high
- 103°39° (1918)
- Record low
- 37°3° (1982)
- Heating degree days
- 19
- Cooling degree days
- 165
Bay City in September
Highs average 73°23° and lows 52°11°, with 2.8 in71 mm of precipitation in a typical September.
- Record high
- 100°38° (1931)
- Record low
- 27°−3° (1942)
- Heating degree days
- 136
- Cooling degree days
- 60
Bay City in OctoberThis month
Highs average 60°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
- 91°33° (2007)
- Record low
- 19°−7° (1925)
- Heating degree days
- 447
- Cooling degree days
- 7
Bay City in November
Highs average 46°8° and lows 32°0°, with 2.3 in58 mm of precipitation and 3 in8 cm of snow in a typical November.
- Record high
- 80°27° (1950)
- Record low
- −3°−19° (1949)
- Heating degree days
- 780
- Cooling degree days
- 0
Bay City in December
Highs average 35°2° and lows 23°−5°, with 1.9 in47 mm of precipitation and 12 in30 cm of snow in a typical December.
- Record high
- 67°19° (2001)
- Record low
- −12°−24° (1914)
- Heating degree days
- 1119
- Cooling degree days
- 0