Pleasant Plains weather by month
What a typical year looks like in Pleasant Plains, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Springfield Abraham Lincoln Capital Airport, 20 km from Pleasant Plains; records cover 1879–2026.
The year at a glance
- Precipitation a year
- 38 in966 mm
- Snow a year
- 22 in55 cm
- Last spring freeze
- Apr 14
- First fall freeze
- Oct 13
- Heating degree days
- 5,218
- Cooling degree days
- 1,251
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −2°−19° (heating, 99%) and 95°35° (cooling, 1%).
Month by month
Pleasant Plains in January
Highs average 36°2° and lows 20°−7°, with 2 in52 mm of precipitation and 7 in17 cm of snow in a typical January.
- Record high
- 73°23° (1909)
- Record low
- −22°−30° (1884)
- Heating degree days
- 1150
- Cooling degree days
- 0
Pleasant Plains in February
Highs average 41°5° and lows 24°−5°, with 1.9 in49 mm of precipitation and 6 in15 cm of snow in a typical February.
- Record high
- 80°27° (2024)
- Record low
- −24°−31° (1905)
- Heating degree days
- 913
- Cooling degree days
- 0
Pleasant Plains in March
Highs average 53°12° and lows 33°1°, with 2.8 in70 mm of precipitation and 3 in8 cm of snow in a typical March.
- Record high
- 92°33° (2026)
- Record low
- −12°−24° (1960)
- Heating degree days
- 681
- Cooling degree days
- 3
Pleasant Plains in April
Highs average 66°19° and lows 43°6°, with 4 in101 mm of precipitation and 0.3 in0.8 cm of snow in a typical April.
- Record high
- 90°32° (1930)
- Record low
- 16°−9° (2018)
- Heating degree days
- 336
- Cooling degree days
- 19
Pleasant Plains in May
Highs average 76°24° and lows 54°12°, with 4.5 in115 mm of precipitation in a typical May.
- Record high
- 101°38° (1934)
- Record low
- 28°−2° (1966)
- Heating degree days
- 111
- Cooling degree days
- 112
Pleasant Plains in June
Highs average 84°29° and lows 63°17°, with 4.6 in117 mm of precipitation in a typical June.
- Record high
- 104°40° (1934)
- Record low
- 39°4° (2003)
- Heating degree days
- 11
- Cooling degree days
- 270
Pleasant Plains in July
Highs average 87°30° and lows 66°19°, with 3.9 in98 mm of precipitation in a typical July.
- Record high
- 112°44° (1954)
- Record low
- 48°9° (1967)
- Heating degree days
- 1
- Cooling degree days
- 357
Pleasant Plains in August
Highs average 85°30° and lows 64°18°, with 3.4 in86 mm of precipitation in a typical August.
- Record high
- 108°42° (1934)
- Record low
- 43°6° (1964)
- Heating degree days
- 3
- Cooling degree days
- 308
Pleasant Plains in September
Highs average 80°27° and lows 56°13°, with 2.9 in73 mm of precipitation in a typical September.
- Record high
- 102°39° (2011)
- Record low
- 31°−1° (1899)
- Heating degree days
- 61
- Cooling degree days
- 151
Pleasant Plains in OctoberThis month
Highs average 67°20° and lows 45°7°, with 3.3 in83 mm of precipitation and 0.1 in0.3 cm of snow in a typical October.
- Record high
- 93°34° (1953)
- Record low
- 13°−11° (1925)
- Heating degree days
- 310
- Cooling degree days
- 30
Pleasant Plains in November
Highs average 53°12° and lows 34°1°, with 2.7 in69 mm of precipitation and 1.2 in3 cm of snow in a typical November.
- Record high
- 83°28° (1950)
- Record low
- −3°−19° (1964)
- Heating degree days
- 648
- Cooling degree days
- 1
Pleasant Plains in December
Highs average 41°5° and lows 25°−4°, with 2.2 in55 mm of precipitation and 4 in11 cm of snow in a typical December.
- Record high
- 74°23° (1970)
- Record low
- −21°−29° (1989)
- Heating degree days
- 993
- Cooling degree days
- 0