Charlestown weather by month
What a typical year looks like in Charlestown, Indiana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at LOUISVILLE BOWMAN FIELD, 22 km from Charlestown; records cover 1937–2026.
The year at a glance
- Precipitation a year
- 48.1 in1222 mm
- Snow a year
- Rare
- Last spring freeze
- Mar 31
- First fall freeze
- Oct 29
- Heating degree days
- 4,149
- Cooling degree days
- 1,543
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
Charlestown in January
Highs average 43°6° and lows 27°−3°, with 3.3 in83 mm of precipitation in a typical January.
- Record high
- 79°26° (1943)
- Record low
- −15°−26° (1942)
- Heating degree days
- 930
- Cooling degree days
- 0
Charlestown in February
Highs average 48°9° and lows 30°−1°, with 3.3 in83 mm of precipitation in a typical February.
- Record high
- 81°27° (2018)
- Record low
- −5°−21° (2015)
- Heating degree days
- 738
- Cooling degree days
- 0
Charlestown in March
Highs average 57°14° and lows 38°3°, with 4.4 in111 mm of precipitation in a typical March.
- Record high
- 87°31° (2026)
- Record low
- 5°−15° (1943)
- Heating degree days
- 552
- Cooling degree days
- 7
Charlestown in April
Highs average 69°20° and lows 48°9°, with 4.7 in119 mm of precipitation in a typical April.
- Record high
- 90°32° (1942)
- Record low
- 24°−4° (1944)
- Heating degree days
- 244
- Cooling degree days
- 36
Charlestown in May
Highs average 77°25° and lows 57°14°, with 5.2 in131 mm of precipitation in a typical May.
- Record high
- 94°34° (1941)
- Record low
- 30°−1° (2020)
- Heating degree days
- 70
- Cooling degree days
- 140
Charlestown in June
Highs average 85°29° and lows 66°19°, with 4.7 in119 mm of precipitation in a typical June.
- Record high
- 105°41° (2012)
- Record low
- 46°8° (1945)
- Heating degree days
- 3
- Cooling degree days
- 313
Charlestown in July
Highs average 88°31° and lows 69°21°, with 4.6 in116 mm of precipitation in a typical July.
- Record high
- 105°41° (2006)
- Record low
- 49°9° (1947)
- Heating degree days
- 0
- Cooling degree days
- 422
Charlestown in August
Highs average 87°31° and lows 68°20°, with 3.5 in90 mm of precipitation in a typical August.
- Record high
- 103°39° (2007)
- Record low
- 45°7° (1946)
- Heating degree days
- 0
- Cooling degree days
- 391
Charlestown in September
Highs average 81°27° and lows 60°16°, with 3.6 in92 mm of precipitation in a typical September.
- Record high
- 101°38° (2011)
- Record low
- 34°1° (1942)
- Heating degree days
- 32
- Cooling degree days
- 194
Charlestown in OctoberThis month
Highs average 69°21° and lows 48°9°, with 3.7 in93 mm of precipitation in a typical October.
- Record high
- 96°36° (2019)
- Record low
- 26°−3° (1942)
- Heating degree days
- 232
- Cooling degree days
- 38
Charlestown in November
Highs average 57°14° and lows 38°3°, with 3.4 in87 mm of precipitation in a typical November.
- Record high
- 84°29° (2016)
- Record low
- 14°−10° (2019)
- Heating degree days
- 536
- Cooling degree days
- 2
Charlestown in December
Highs average 46°8° and lows 31°0°, with 3.9 in99 mm of precipitation in a typical December.
- Record high
- 75°24° (2016)
- Record low
- −7°−22° (2022)
- Heating degree days
- 812
- Cooling degree days
- 0