Mount Vernon weather by month
What a typical year looks like in Mount Vernon, Indiana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Mount Vernon, 1 km from Mount Vernon; records cover 1893–2026.
The year at a glance
- Precipitation a year
- 46.6 in1184 mm
- Snow a year
- 8 in21 cm
- Last spring freeze
- Apr 5
- First fall freeze
- Nov 2
- Heating degree days
- 4,608
- Cooling degree days
- 1,343
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 7°−14° (heating, 99%) and 96°36° (cooling, 1%).
Month by month
Mount Vernon in January
Highs average 42°5° and lows 23°−5°, with 3.5 in90 mm of precipitation and 2.4 in6.1 cm of snow in a typical January.
- Record high
- 73°23° (1943)
- Record low
- −21°−29° (1912)
- Heating degree days
- 1015
- Cooling degree days
- 0
Mount Vernon in February
Highs average 46°8° and lows 26°−4°, with 2.9 in74 mm of precipitation and 3 in8 cm of snow in a typical February.
- Record high
- 78°26° (1911)
- Record low
- −19°−28° (1899)
- Heating degree days
- 816
- Cooling degree days
- 0
Mount Vernon in March
Highs average 56°13° and lows 34°1°, with 4.5 in115 mm of precipitation and 1.5 in3.8 cm of snow in a typical March.
- Record high
- 90°32° (1929)
- Record low
- −3°−19° (1960)
- Heating degree days
- 633
- Cooling degree days
- 2
Mount Vernon in April
Highs average 67°20° and lows 44°7°, with 5.1 in129 mm of precipitation in a typical April.
- Record high
- 91°33° (1906)
- Record low
- 21°−6° (1923)
- Heating degree days
- 300
- Cooling degree days
- 16
Mount Vernon in May
Highs average 77°25° and lows 54°12°, with 5 in126 mm of precipitation in a typical May.
- Record high
- 98°37° (1908)
- Record low
- 31°−1° (1903)
- Heating degree days
- 89
- Cooling degree days
- 106
Mount Vernon in June
Highs average 85°29° and lows 64°18°, with 4.6 in118 mm of precipitation in a typical June.
- Record high
- 106°41° (2012)
- Record low
- 40°4° (1899)
- Heating degree days
- 7
- Cooling degree days
- 288
Mount Vernon in July
Highs average 88°31° and lows 67°19°, with 3.6 in92 mm of precipitation in a typical July.
- Record high
- 109°43° (1901)
- Record low
- 50°10° (1911)
- Heating degree days
- 0
- Cooling degree days
- 380
Mount Vernon in August
Highs average 87°31° and lows 65°18°, with 3 in75 mm of precipitation in a typical August.
- Record high
- 104°40° (1930)
- Record low
- 44°7° (1965)
- Heating degree days
- 1
- Cooling degree days
- 342
Mount Vernon in September
Highs average 82°28° and lows 57°14°, with 3.2 in81 mm of precipitation in a typical September.
- Record high
- 107°42° (1953)
- Record low
- 29°−2° (1899)
- Heating degree days
- 40
- Cooling degree days
- 174
Mount Vernon in OctoberThis month
Highs average 70°21° and lows 45°7°, with 3.5 in89 mm of precipitation and 0.2 in0.5 cm of snow in a typical October.
- Record high
- 96°36° (1953)
- Record low
- 22°−6° (1925)
- Heating degree days
- 254
- Cooling degree days
- 33
Mount Vernon in November
Highs average 57°14° and lows 35°2°, with 3.9 in99 mm of precipitation and 0.1 in0.3 cm of snow in a typical November.
- Record high
- 84°29° (2016)
- Record low
- −1°−18° (1950)
- Heating degree days
- 573
- Cooling degree days
- 2
Mount Vernon in December
Highs average 46°8° and lows 27°−3°, with 3.8 in96 mm of precipitation and 1.1 in2.8 cm of snow in a typical December.
- Record high
- 77°25° (1982)
- Record low
- −16°−27° (1989)
- Heating degree days
- 880
- Cooling degree days
- 0