Charleston weather by month
What a typical year looks like in Charleston, Missouri: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Cairo 3n, 19 km from Charleston; records cover 1987–2026.
The year at a glance
- Precipitation a year
- 51 in1295 mm
- Snow a year
- Rare
- Last spring freeze
- Mar 27
- First fall freeze
- Nov 1
- Heating degree days
- 4,073
- Cooling degree days
- 1,592
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 10°−12° (heating, 99%) and 96°36° (cooling, 1%).
Month by month
Charleston in January
Highs average 43°6° and lows 26°−3°, with 3.8 in97 mm of precipitation in a typical January.
- Record high
- 77°25° (2019)
- Record low
- −4°−20° (1994)
- Heating degree days
- 939
- Cooling degree days
- 0
Charleston in February
Highs average 48°9° and lows 30°−1°, with 3.9 in99 mm of precipitation in a typical February.
- Record high
- 76°24° (1996)
- Record low
- −5°−21° (1996)
- Heating degree days
- 732
- Cooling degree days
- 0
Charleston in March
Highs average 59°15° and lows 38°3°, with 4.9 in123 mm of precipitation in a typical March.
- Record high
- 86°30° (2026)
- Record low
- 10°−12° (1996)
- Heating degree days
- 530
- Cooling degree days
- 6
Charleston in April
Highs average 70°21° and lows 48°9°, with 5.4 in137 mm of precipitation in a typical April.
- Record high
- 94°34° (2010)
- Record low
- 25°−4° (2007)
- Heating degree days
- 227
- Cooling degree days
- 38
Charleston in May
Highs average 78°26° and lows 58°14°, with 5.1 in129 mm of precipitation in a typical May.
- Record high
- 98°37° (2012)
- Record low
- 26°−3° (1992)
- Heating degree days
- 52
- Cooling degree days
- 145
Charleston in June
Highs average 86°30° and lows 66°19°, with 4.4 in111 mm of precipitation in a typical June.
- Record high
- 106°41° (2012)
- Record low
- 45°7° (1988)
- Heating degree days
- 2
- Cooling degree days
- 332
Charleston in July
Highs average 89°32° and lows 70°21°, with 4.1 in104 mm of precipitation in a typical July.
- Record high
- 108°42° (2012)
- Record low
- 56°13° (2004)
- Heating degree days
- 0
- Cooling degree days
- 439
Charleston in August
Highs average 88°31° and lows 68°20°, with 3.2 in81 mm of precipitation in a typical August.
- Record high
- 103°39° (2007)
- Record low
- 51°11° (1988)
- Heating degree days
- 1
- Cooling degree days
- 393
Charleston in September
Highs average 82°28° and lows 60°15°, with 3.5 in89 mm of precipitation in a typical September.
- Record high
- 101°38° (2011)
- Record low
- 37°3° (2020)
- Heating degree days
- 26
- Cooling degree days
- 196
Charleston in OctoberThis month
Highs average 71°22° and lows 48°9°, with 4.1 in105 mm of precipitation in a typical October.
- Record high
- 91°33° (2007)
- Record low
- 25°−4° (1993)
- Heating degree days
- 217
- Cooling degree days
- 40
Charleston in November
Highs average 58°14° and lows 37°3°, with 4.5 in113 mm of precipitation in a typical November.
- Record high
- 82°28° (1999)
- Record low
- 14°−10° (2019)
- Heating degree days
- 523
- Cooling degree days
- 3
Charleston in December
Highs average 47°8° and lows 30°−1°, with 4.3 in108 mm of precipitation in a typical December.
- Record high
- 75°24° (2021)
- Record low
- −9°−23° (1989)
- Heating degree days
- 824
- Cooling degree days
- 0