Plain weather by month
What a typical year looks like in Plain, Wisconsin: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Lone Rock Tri County Airport, 14 km from Plain; records cover 1948–2026.
The year at a glance
- Precipitation a year
- 34.1 in866 mm
- Snow a year
- Rare
- Last spring freeze
- May 5
- First fall freeze
- Oct 5
- Heating degree days
- 7,066
- Cooling degree days
- 646
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −16°−27° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Plain in January
Highs average 28°−2° and lows 10°−12°, with 0.88 in22 mm of precipitation in a typical January.
- Record high
- 59°15° (2025)
- Record low
- −53°−47° (1951)
- Heating degree days
- 1435
- Cooling degree days
- 0
Plain in February
Highs average 32°0° and lows 14°−10°, with 0.87 in22 mm of precipitation in a typical February.
- Record high
- 73°23° (2024)
- Record low
- −42°−41° (1951)
- Heating degree days
- 1176
- Cooling degree days
- 0
Plain in March
Highs average 45°7° and lows 26°−3°, with 1.9 in48 mm of precipitation in a typical March.
- Record high
- 83°28° (2012)
- Record low
- −39° (1962)
- Heating degree days
- 914
- Cooling degree days
- 1
Plain in April
Highs average 58°15° and lows 36°2°, with 3.7 in94 mm of precipitation in a typical April.
- Record high
- 97°36° (1980)
- Record low
- −3°−19° (1982)
- Heating degree days
- 533
- Cooling degree days
- 2
Plain in May
Highs average 70°21° and lows 48°9°, with 3.7 in94 mm of precipitation in a typical May.
- Record high
- 97°36° (2018)
- Record low
- 21°−6° (2005)
- Heating degree days
- 223
- Cooling degree days
- 42
Plain in June
Highs average 79°26° and lows 58°14°, with 5.3 in134 mm of precipitation in a typical June.
- Record high
- 99°37° (2011)
- Record low
- 34°1° (1972)
- Heating degree days
- 35
- Cooling degree days
- 143
Plain in July
Highs average 83°28° and lows 61°16°, with 4.5 in115 mm of precipitation in a typical July.
- Record high
- 102°39° (2012)
- Record low
- 40°4° (1967)
- Heating degree days
- 7
- Cooling degree days
- 224
Plain in August
Highs average 81°27° and lows 59°15°, with 4.2 in106 mm of precipitation in a typical August.
- Record high
- 101°38° (1948)
- Record low
- 37°3° (1950)
- Heating degree days
- 19
- Cooling degree days
- 169
Plain in September
Highs average 74°23° and lows 51°10°, with 3.4 in87 mm of precipitation in a typical September.
- Record high
- 100°38° (1955)
- Record low
- 20°−7° (1949)
- Heating degree days
- 144
- Cooling degree days
- 58
Plain in OctoberThis month
Highs average 61°16° and lows 39°4°, with 2.5 in63 mm of precipitation in a typical October.
- Record high
- 94°34° (1963)
- Record low
- 8°−13° (1952)
- Heating degree days
- 483
- Cooling degree days
- 7
Plain in November
Highs average 46°8° and lows 28°−2°, with 2 in50 mm of precipitation in a typical November.
- Record high
- 78°26° (1964)
- Record low
- −18°−28° (1977)
- Heating degree days
- 848
- Cooling degree days
- 0
Plain in December
Highs average 33°0° and lows 17°−9°, with 1.2 in30 mm of precipitation in a typical December.
- Record high
- 69°21° (2021)
- Record low
- −36°−38° (1950)
- Heating degree days
- 1249
- Cooling degree days
- 0