Mineral weather by month
What a typical year looks like in Mineral, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at KEWANEE 1E, 16 km from Mineral; records cover 1939–2026.
The year at a glance
- Precipitation a year
- 39.6 in1005 mm
- Snow a year
- 31 in78 cm
- Last spring freeze
- Apr 22
- First fall freeze
- Oct 12
- Heating degree days
- 6,408
- Cooling degree days
- 829
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −7°−22° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
Mineral in January
Highs average 30°−1° and lows 14°−10°, with 1.9 in48 mm of precipitation and 9 in22 cm of snow in a typical January.
- Record high
- 67°19° (1989)
- Record low
- −27°−33° (2019)
- Heating degree days
- 1331
- Cooling degree days
- 0
Mineral in February
Highs average 35°2° and lows 17°−8°, with 2.1 in52 mm of precipitation and 9 in22 cm of snow in a typical February.
- Record high
- 74°23° (2024)
- Record low
- −25°−32° (2019)
- Heating degree days
- 1089
- Cooling degree days
- 0
Mineral in March
Highs average 48°9° and lows 27°−3°, with 2.6 in67 mm of precipitation and 3 in8 cm of snow in a typical March.
- Record high
- 85°29° (1986)
- Record low
- −11°−24° (1978)
- Heating degree days
- 852
- Cooling degree days
- 1
Mineral in April
Highs average 61°16° and lows 38°3°, with 4 in101 mm of precipitation and 1.2 in3 cm of snow in a typical April.
- Record high
- 91°33° (1986)
- Record low
- −2°−19° (1982)
- Heating degree days
- 477
- Cooling degree days
- 6
Mineral in May
Highs average 72°22° and lows 50°10°, with 5.1 in129 mm of precipitation in a typical May.
- Record high
- 96°36° (2018)
- Record low
- 22°−6° (2005)
- Heating degree days
- 181
- Cooling degree days
- 60
Mineral in June
Highs average 81°27° and lows 60°16°, with 5 in127 mm of precipitation in a typical June.
- Record high
- 101°38° (1971)
- Record low
- 38°3° (1945)
- Heating degree days
- 24
- Cooling degree days
- 190
Mineral in July
Highs average 84°29° and lows 63°17°, with 3.7 in94 mm of precipitation in a typical July.
- Record high
- 105°41° (1940)
- Record low
- 42°6° (1983)
- Heating degree days
- 4
- Cooling degree days
- 269
Mineral in August
Highs average 82°28° and lows 61°16°, with 3.9 in98 mm of precipitation in a typical August.
- Record high
- 103°39° (1953)
- Record low
- 38°3° (1986)
- Heating degree days
- 9
- Cooling degree days
- 209
Mineral in September
Highs average 77°25° and lows 52°11°, with 3.7 in93 mm of precipitation in a typical September.
- Record high
- 102°39° (1953)
- Record low
- 25°−4° (1942)
- Heating degree days
- 107
- Cooling degree days
- 83
Mineral in OctoberThis month
Highs average 64°18° and lows 41°5°, with 2.9 in74 mm of precipitation and 0.3 in0.8 cm of snow in a typical October.
- Record high
- 91°33° (1954)
- Record low
- 17°−8° (1942)
- Heating degree days
- 402
- Cooling degree days
- 11
Mineral in November
Highs average 49°9° and lows 30°−1°, with 2.7 in67 mm of precipitation and 1.4 in3.6 cm of snow in a typical November.
- Record high
- 79°26° (1944)
- Record low
- −4°−20° (1959)
- Heating degree days
- 777
- Cooling degree days
- 0
Mineral in December
Highs average 36°2° and lows 20°−7°, with 2.2 in55 mm of precipitation and 8 in19 cm of snow in a typical December.
- Record high
- 70°21° (2021)
- Record low
- −24°−31° (1983)
- Heating degree days
- 1155
- Cooling degree days
- 0