Westport weather by month
What a typical year looks like in Westport, Indiana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at North Vernon 2 Ese, 20 km from Westport; records cover 1938–2026.
The year at a glance
- Precipitation a year
- 49.3 in1252 mm
- Snow a year
- 17 in44 cm
- Last spring freeze
- Apr 16
- First fall freeze
- Oct 18
- Heating degree days
- 4,776
- Cooling degree days
- 1,097
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 3°−16° (heating, 99%) and 94°34° (cooling, 1%).
Month by month
Westport in January
Highs average 40°4° and lows 23°−5°, with 3.4 in86 mm of precipitation and 5 in12 cm of snow in a typical January.
- Record high
- 77°25° (1943)
- Record low
- −24°−31° (1977)
- Heating degree days
- 1037
- Cooling degree days
- 0
Westport in February
Highs average 45°7° and lows 26°−3°, with 3.2 in80 mm of precipitation and 6 in15 cm of snow in a typical February.
- Record high
- 79°26° (2018)
- Record low
- −18°−28° (2015)
- Heating degree days
- 822
- Cooling degree days
- 0
Westport in March
Highs average 55°13° and lows 34°1°, with 4.2 in107 mm of precipitation and 2.2 in5.6 cm of snow in a typical March.
- Record high
- 86°30° (2026)
- Record low
- −6°−21° (1943)
- Heating degree days
- 632
- Cooling degree days
- 4
Westport in April
Highs average 67°20° and lows 44°6°, with 5.3 in134 mm of precipitation and 0.1 in0.3 cm of snow in a typical April.
- Record high
- 89°32° (1942)
- Record low
- 19°−7° (1943)
- Heating degree days
- 307
- Cooling degree days
- 22
Westport in May
Highs average 75°24° and lows 53°12°, with 4.9 in125 mm of precipitation in a typical May.
- Record high
- 95°35° (1962)
- Record low
- 22°−6° (1989)
- Heating degree days
- 114
- Cooling degree days
- 91
Westport in June
Highs average 83°28° and lows 61°16°, with 5.1 in129 mm of precipitation in a typical June.
- Record high
- 105°41° (2012)
- Record low
- 36°2° (1966)
- Heating degree days
- 12
- Cooling degree days
- 225
Westport in July
Highs average 86°30° and lows 65°18°, with 4.5 in114 mm of precipitation in a typical July.
- Record high
- 105°41° (1954)
- Record low
- 43°6° (1943)
- Heating degree days
- 1
- Cooling degree days
- 319
Westport in August
Highs average 85°29° and lows 63°17°, with 4.5 in113 mm of precipitation in a typical August.
- Record high
- 103°39° (1983)
- Record low
- 40°4° (1965)
- Heating degree days
- 2
- Cooling degree days
- 283
Westport in September
Highs average 79°26° and lows 56°13°, with 3.3 in85 mm of precipitation in a typical September.
- Record high
- 104°40° (1939)
- Record low
- 26°−3° (1942)
- Heating degree days
- 57
- Cooling degree days
- 130
Westport in OctoberThis month
Highs average 68°20° and lows 45°7°, with 3.5 in90 mm of precipitation in a typical October.
- Record high
- 95°35° (1939)
- Record low
- 18°−8° (1962)
- Heating degree days
- 285
- Cooling degree days
- 22
Westport in November
Highs average 55°13° and lows 35°2°, with 3.8 in97 mm of precipitation and 0.3 in0.8 cm of snow in a typical November.
- Record high
- 82°28° (1958)
- Record low
- −2°−19° (1958)
- Heating degree days
- 597
- Cooling degree days
- 1
Westport in December
Highs average 44°6° and lows 28°−2°, with 3.7 in93 mm of precipitation and 4 in10 cm of snow in a typical December.
- Record high
- 74°23° (1982)
- Record low
- −22°−30° (1989)
- Heating degree days
- 910
- Cooling degree days
- 0