Newton weather by month
What a typical year looks like in Newton, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Newton, 2 km from Newton; records cover 1995–2026.
The year at a glance
- Precipitation a year
- 46 in1169 mm
- Snow a year
- 16 in41 cm
- Last spring freeze
- Apr 13
- First fall freeze
- Oct 18
- Heating degree days
- 5,036
- Cooling degree days
- 1,234
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 1°−17° (heating, 99%) and 96°36° (cooling, 1%).
Month by month
Newton in January
Highs average 37°3° and lows 22°−6°, with 3.2 in82 mm of precipitation and 5 in13 cm of snow in a typical January.
- Record high
- 67°19° (2002)
- Record low
- −14°−26° (2014)
- Heating degree days
- 1100
- Cooling degree days
- 0
Newton in February
Highs average 42°6° and lows 25°−4°, with 2.6 in66 mm of precipitation and 4 in10 cm of snow in a typical February.
- Record high
- 76°24° (2024)
- Record low
- −13°−25° (1996)
- Heating degree days
- 875
- Cooling degree days
- 0
Newton in March
Highs average 53°12° and lows 34°1°, with 3.7 in95 mm of precipitation and 2.1 in5.3 cm of snow in a typical March.
- Record high
- 87°31° (2026)
- Record low
- −5°−21° (2015)
- Heating degree days
- 671
- Cooling degree days
- 3
Newton in April
Highs average 65°18° and lows 44°7°, with 5 in127 mm of precipitation and 0.2 in0.5 cm of snow in a typical April.
- Record high
- 90°32° (2007)
- Record low
- 23°−5° (1997)
- Heating degree days
- 331
- Cooling degree days
- 16
Newton in May
Highs average 75°24° and lows 55°13°, with 4.8 in122 mm of precipitation in a typical May.
- Record high
- 94°34° (2012)
- Record low
- 30°−1° (2005)
- Heating degree days
- 113
- Cooling degree days
- 99
Newton in June
Highs average 84°29° and lows 64°18°, with 5.3 in134 mm of precipitation in a typical June.
- Record high
- 104°40° (2012)
- Record low
- 40°4° (2003)
- Heating degree days
- 9
- Cooling degree days
- 268
Newton in July
Highs average 86°30° and lows 67°19°, with 4.2 in107 mm of precipitation in a typical July.
- Record high
- 107°42° (2012)
- Record low
- 48°9° (2013)
- Heating degree days
- 1
- Cooling degree days
- 360
Newton in August
Highs average 85°30° and lows 65°18°, with 3.1 in78 mm of precipitation in a typical August.
- Record high
- 101°38° (2007)
- Record low
- 44°7° (2004)
- Heating degree days
- 2
- Cooling degree days
- 311
Newton in September
Highs average 80°26° and lows 57°14°, with 3.3 in83 mm of precipitation in a typical September.
- Record high
- 100°38° (2007)
- Record low
- 31°−1° (1995)
- Heating degree days
- 53
- Cooling degree days
- 147
Newton in OctoberThis month
Highs average 68°20° and lows 46°8°, with 3.8 in98 mm of precipitation in a typical October.
- Record high
- 95°35° (2007)
- Record low
- 23°−5° (1997)
- Heating degree days
- 291
- Cooling degree days
- 29
Newton in November
Highs average 53°12° and lows 35°2°, with 3.9 in98 mm of precipitation and 0.7 in1.8 cm of snow in a typical November.
- Record high
- 83°28° (2016)
- Record low
- 4°−16° (2019)
- Heating degree days
- 634
- Cooling degree days
- 1
Newton in December
Highs average 42°5° and lows 27°−3°, with 3.1 in80 mm of precipitation and 4 in10 cm of snow in a typical December.
- Record high
- 72°22° (1998)
- Record low
- −8°−22° (2022)
- Heating degree days
- 956
- Cooling degree days
- 0