Smithville weather by month
What a typical year looks like in Smithville, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at General Wayne A. Downing International Airport, 10 km from Smithville; records cover 1883–2026.
The year at a glance
- Precipitation a year
- 37.6 in954 mm
- Snow a year
- 26 in67 cm
- Last spring freeze
- Apr 14
- First fall freeze
- Oct 17
- Heating degree days
- 5,614
- Cooling degree days
- 1,157
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −3°−19° (heating, 99%) and 95°35° (cooling, 1%).
Month by month
Smithville in January
Highs average 34°1° and lows 18°−8°, with 2.1 in52 mm of precipitation and 8 in20 cm of snow in a typical January.
- Record high
- 71°22° (1909)
- Record low
- −27°−33° (1884)
- Heating degree days
- 1221
- Cooling degree days
- 0
Smithville in February
Highs average 39°4° and lows 21°−6°, with 2 in51 mm of precipitation and 7 in18 cm of snow in a typical February.
- Record high
- 78°26° (2024)
- Record low
- −26°−32° (1905)
- Heating degree days
- 978
- Cooling degree days
- 0
Smithville in March
Highs average 51°11° and lows 32°0°, with 2.7 in68 mm of precipitation and 3 in8 cm of snow in a typical March.
- Record high
- 87°31° (1907)
- Record low
- −10°−23° (1943)
- Heating degree days
- 734
- Cooling degree days
- 2
Smithville in April
Highs average 64°18° and lows 42°6°, with 4 in101 mm of precipitation and 0.5 in1.3 cm of snow in a typical April.
- Record high
- 92°33° (1894)
- Record low
- 14°−10° (1920)
- Heating degree days
- 376
- Cooling degree days
- 12
Smithville in May
Highs average 74°23° and lows 53°12°, with 4.7 in119 mm of precipitation in a typical May.
- Record high
- 104°40° (1934)
- Record low
- 25°−4° (1966)
- Heating degree days
- 135
- Cooling degree days
- 88
Smithville in June
Highs average 83°28° and lows 62°17°, with 3.7 in95 mm of precipitation in a typical June.
- Record high
- 105°41° (1934)
- Record low
- 39°4° (1945)
- Heating degree days
- 13
- Cooling degree days
- 247
Smithville in July
Highs average 86°30° and lows 66°19°, with 3.5 in90 mm of precipitation in a typical July.
- Record high
- 113°45° (1936)
- Record low
- 46°8° (1911)
- Heating degree days
- 1
- Cooling degree days
- 351
Smithville in August
Highs average 85°29° and lows 64°18°, with 3.3 in84 mm of precipitation in a typical August.
- Record high
- 106°41° (1936)
- Record low
- 41°5° (1910)
- Heating degree days
- 3
- Cooling degree days
- 297
Smithville in September
Highs average 78°26° and lows 56°13°, with 3.5 in88 mm of precipitation in a typical September.
- Record high
- 104°40° (1899)
- Record low
- 26°−3° (1899)
- Heating degree days
- 66
- Cooling degree days
- 137
Smithville in OctoberThis month
Highs average 65°19° and lows 44°7°, with 3.2 in81 mm of precipitation and 0.1 in0.3 cm of snow in a typical October.
- Record high
- 93°34° (2006)
- Record low
- 7°−14° (1925)
- Heating degree days
- 335
- Cooling degree days
- 22
Smithville in November
Highs average 51°10° and lows 33°1°, with 2.7 in69 mm of precipitation and 1.5 in3.8 cm of snow in a typical November.
- Record high
- 81°27° (1888)
- Record low
- −2°−19° (1977)
- Heating degree days
- 694
- Cooling degree days
- 1
Smithville in December
Highs average 39°4° and lows 23°−5°, with 2.2 in56 mm of precipitation and 6 in16 cm of snow in a typical December.
- Record high
- 71°22° (1970)
- Record low
- −24°−31° (1924)
- Heating degree days
- 1058
- Cooling degree days
- 0