Manlius weather by month
What a typical year looks like in Manlius, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Walnut, 12 km from Manlius; records cover 1893–2026.
The year at a glance
- Precipitation a year
- 36.8 in936 mm
- Snow a year
- 36 in91 cm
- Last spring freeze
- Apr 21
- First fall freeze
- Oct 12
- Heating degree days
- 6,508
- Cooling degree days
- 840
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −9°−23° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Manlius in January
Highs average 29°−1° and lows 13°−11°, with 1.5 in39 mm of precipitation and 13 in32 cm of snow in a typical January.
- Record high
- 65°18° (1967)
- Record low
- −27°−33° (1985)
- Heating degree days
- 1361
- Cooling degree days
- 0
Manlius in February
Highs average 34°1° and lows 17°−8°, with 1.7 in44 mm of precipitation and 8 in21 cm of snow in a typical February.
- Record high
- 77°25° (2024)
- Record low
- −26°−32° (1905)
- Heating degree days
- 1107
- Cooling degree days
- 0
Manlius in March
Highs average 47°8° and lows 28°−2°, with 2.2 in56 mm of precipitation and 5 in12 cm of snow in a typical March.
- Record high
- 87°31° (1986)
- Record low
- −13°−25° (1962)
- Heating degree days
- 854
- Cooling degree days
- 0
Manlius in April
Highs average 61°16° and lows 39°4°, with 3.4 in85 mm of precipitation and 0.6 in1.5 cm of snow in a typical April.
- Record high
- 94°34° (1895)
- Record low
- 6°−14° (1982)
- Heating degree days
- 472
- Cooling degree days
- 9
Manlius in May
Highs average 72°22° and lows 51°10°, with 4.6 in118 mm of precipitation in a typical May.
- Record high
- 105°41° (1934)
- Record low
- 24°−4° (2005)
- Heating degree days
- 184
- Cooling degree days
- 65
Manlius in June
Highs average 81°27° and lows 60°16°, with 4.9 in125 mm of precipitation in a typical June.
- Record high
- 106°41° (1934)
- Record low
- 37°3° (1894)
- Heating degree days
- 27
- Cooling degree days
- 190
Manlius in July
Highs average 83°29° and lows 63°17°, with 3.9 in100 mm of precipitation in a typical July.
- Record high
- 111°44° (1936)
- Record low
- 44°7° (1904)
- Heating degree days
- 5
- Cooling degree days
- 264
Manlius in August
Highs average 82°28° and lows 61°16°, with 3.8 in97 mm of precipitation in a typical August.
- Record high
- 105°41° (1936)
- Record low
- 37°3° (1896)
- Heating degree days
- 12
- Cooling degree days
- 207
Manlius in September
Highs average 76°24° and lows 53°12°, with 3.4 in86 mm of precipitation in a typical September.
- Record high
- 103°39° (1897)
- Record low
- 22°−6° (1899)
- Heating degree days
- 109
- Cooling degree days
- 92
Manlius in OctoberThis month
Highs average 63°17° and lows 41°5°, with 3 in75 mm of precipitation and 0.2 in0.5 cm of snow in a typical October.
- Record high
- 98°37° (1897)
- Record low
- 10°−12° (1925)
- Heating degree days
- 412
- Cooling degree days
- 13
Manlius in November
Highs average 48°9° and lows 30°−1°, with 2.3 in59 mm of precipitation and 2 in5.1 cm of snow in a typical November.
- Record high
- 81°27° (1950)
- Record low
- −8°−22° (1976)
- Heating degree days
- 789
- Cooling degree days
- 0
Manlius in December
Highs average 35°2° and lows 19°−7°, with 2 in51 mm of precipitation and 7 in19 cm of snow in a typical December.
- Record high
- 70°21° (2012)
- Record low
- −23°−31° (1924)
- Heating degree days
- 1176
- Cooling degree days
- 0