St. Louis weather by month
What a typical year looks like in St. Louis, Michigan: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Alma, 4 km from St. Louis; records cover 1887–2026.
The year at a glance
- Precipitation a year
- 34.5 in876 mm
- Snow a year
- 39 in100 cm
- Last spring freeze
- May 1
- First fall freeze
- Oct 5
- Heating degree days
- 7,049
- Cooling degree days
- 542
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −4°−20° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
St. Louis in January
Highs average 29°−2° and lows 15°−9°, with 2.2 in55 mm of precipitation and 11 in27 cm of snow in a typical January.
- Record high
- 64°18° (1944)
- Record low
- −24°−31° (1904)
- Heating degree days
- 1331
- Cooling degree days
- 0
St. Louis in February
Highs average 32°0° and lows 15°−9°, with 1.8 in45 mm of precipitation and 10 in25 cm of snow in a typical February.
- Record high
- 72°22° (2024)
- Record low
- −29°−34° (1918)
- Heating degree days
- 1156
- Cooling degree days
- 0
St. Louis in March
Highs average 43°6° and lows 23°−5°, with 2.1 in53 mm of precipitation and 5 in14 cm of snow in a typical March.
- Record high
- 86°30° (2012)
- Record low
- −18°−28° (1948)
- Heating degree days
- 992
- Cooling degree days
- 0
St. Louis in April
Highs average 56°13° and lows 35°1°, with 3.5 in88 mm of precipitation and 2.1 in5.3 cm of snow in a typical April.
- Record high
- 89°32° (1915)
- Record low
- 5°−15° (1982)
- Heating degree days
- 596
- Cooling degree days
- 2
St. Louis in May
Highs average 69°20° and lows 46°8°, with 3.7 in95 mm of precipitation in a typical May.
- Record high
- 94°34° (2006)
- Record low
- 20°−7° (1891)
- Heating degree days
- 277
- Cooling degree days
- 31
St. Louis in June
Highs average 78°26° and lows 56°13°, with 3.6 in92 mm of precipitation in a typical June.
- Record high
- 100°38° (1995)
- Record low
- 33°1° (1918)
- Heating degree days
- 61
- Cooling degree days
- 116
St. Louis in July
Highs average 82°28° and lows 59°15°, with 3.3 in83 mm of precipitation in a typical July.
- Record high
- 108°42° (1936)
- Record low
- 37°3° (1898)
- Heating degree days
- 14
- Cooling degree days
- 192
St. Louis in August
Highs average 80°27° and lows 58°14°, with 3.7 in94 mm of precipitation in a typical August.
- Record high
- 102°39° (1918)
- Record low
- 30°−1° (1911)
- Heating degree days
- 25
- Cooling degree days
- 147
St. Louis in September
Highs average 73°23° and lows 50°10°, with 2.7 in69 mm of precipitation in a typical September.
- Record high
- 98°37° (1925)
- Record low
- 24°−4° (1887)
- Heating degree days
- 160
- Cooling degree days
- 49
St. Louis in OctoberThis month
Highs average 60°16° and lows 39°4°, with 3.2 in82 mm of precipitation and 0.3 in0.8 cm of snow in a typical October.
- Record high
- 90°32° (2007)
- Record low
- 12°−11° (1887)
- Heating degree days
- 479
- Cooling degree days
- 5
St. Louis in November
Highs average 46°8° and lows 30°−1°, with 2.7 in68 mm of precipitation and 2.7 in6.9 cm of snow in a typical November.
- Record high
- 82°28° (1950)
- Record low
- −6°−21° (1895)
- Heating degree days
- 817
- Cooling degree days
- 0
St. Louis in December
Highs average 35°1° and lows 22°−6°, with 2 in52 mm of precipitation and 8 in21 cm of snow in a typical December.
- Record high
- 68°20° (2001)
- Record low
- −14°−26° (1904)
- Heating degree days
- 1141
- Cooling degree days
- 0