Petersburg weather by month
What a typical year looks like in Petersburg, Indiana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at WASHINGTON 1 W, 19 km from Petersburg; records cover 1896–2026.
The year at a glance
- Precipitation a year
- 48 in1219 mm
- Snow a year
- 9 in23 cm
- Last spring freeze
- Apr 8
- First fall freeze
- Oct 22
- Heating degree days
- 4,494
- Cooling degree days
- 1,370
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 4°−16° (heating, 99%) and 95°35° (cooling, 1%).
Month by month
Petersburg in January
Highs average 40°5° and lows 24°−5°, with 3.6 in91 mm of precipitation and 2.9 in7.4 cm of snow in a typical January.
- Record high
- 76°24° (1943)
- Record low
- −18°−28° (1985)
- Heating degree days
- 1018
- Cooling degree days
- 0
Petersburg in February
Highs average 46°8° and lows 28°−2°, with 2.9 in73 mm of precipitation and 2 in5.1 cm of snow in a typical February.
- Record high
- 77°25° (2018)
- Record low
- −19°−28° (1899)
- Heating degree days
- 797
- Cooling degree days
- 0
Petersburg in March
Highs average 57°14° and lows 36°2°, with 4 in102 mm of precipitation and 1 in2.5 cm of snow in a typical March.
- Record high
- 89°32° (1929)
- Record low
- −4°−20° (1960)
- Heating degree days
- 589
- Cooling degree days
- 5
Petersburg in April
Highs average 69°20° and lows 45°7°, with 4.8 in123 mm of precipitation in a typical April.
- Record high
- 93°34° (1899)
- Record low
- 19°−7° (1923)
- Heating degree days
- 270
- Cooling degree days
- 28
Petersburg in May
Highs average 77°25° and lows 56°13°, with 5.5 in140 mm of precipitation in a typical May.
- Record high
- 100°38° (1911)
- Record low
- 28°−2° (1966)
- Heating degree days
- 79
- Cooling degree days
- 132
Petersburg in June
Highs average 85°29° and lows 64°18°, with 5.2 in131 mm of precipitation in a typical June.
- Record high
- 107°42° (1936)
- Record low
- 38°3° (1903)
- Heating degree days
- 5
- Cooling degree days
- 288
Petersburg in July
Highs average 87°31° and lows 67°19°, with 4.1 in105 mm of precipitation in a typical July.
- Record high
- 113°45° (1930)
- Record low
- 47°8° (1999)
- Heating degree days
- 0
- Cooling degree days
- 375
Petersburg in August
Highs average 86°30° and lows 65°18°, with 3.2 in81 mm of precipitation in a typical August.
- Record high
- 108°42° (1930)
- Record low
- 42°6° (1965)
- Heating degree days
- 2
- Cooling degree days
- 333
Petersburg in September
Highs average 81°27° and lows 58°14°, with 3.5 in89 mm of precipitation in a typical September.
- Record high
- 106°41° (1925)
- Record low
- 29°−2° (1928)
- Heating degree days
- 38
- Cooling degree days
- 169
Petersburg in OctoberThis month
Highs average 70°21° and lows 47°8°, with 3.6 in91 mm of precipitation and 0.1 in0.3 cm of snow in a typical October.
- Record high
- 96°36° (1922)
- Record low
- 18°−8° (1925)
- Heating degree days
- 242
- Cooling degree days
- 38
Petersburg in November
Highs average 56°13° and lows 36°2°, with 3.9 in99 mm of precipitation and 0.1 in0.3 cm of snow in a typical November.
- Record high
- 84°29° (1950)
- Record low
- −2°−19° (2019)
- Heating degree days
- 572
- Cooling degree days
- 2
Petersburg in December
Highs average 45°7° and lows 28°−2°, with 3.7 in93 mm of precipitation and 3 in8 cm of snow in a typical December.
- Record high
- 75°24° (1982)
- Record low
- −19°−28° (1989)
- Heating degree days
- 882
- Cooling degree days
- 0