Ransom weather by month
What a typical year looks like in Ransom, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at MARSEILLES LOCK/DAM, 21 km from Ransom; records cover 1949–2026.
The year at a glance
- Precipitation a year
- 39 in991 mm
- Snow a year
- 25 in64 cm
- Last spring freeze
- Apr 30
- First fall freeze
- Oct 15
- Heating degree days
- 6,352
- Cooling degree days
- 801
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −6°−21° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Ransom in January
Highs average 31°0° and lows 14°−10°, with 2 in50 mm of precipitation and 8 in21 cm of snow in a typical January.
- Record high
- 65°18° (2008)
- Record low
- −27°−33° (1999)
- Heating degree days
- 1308
- Cooling degree days
- 0
Ransom in February
Highs average 35°2° and lows 17°−8°, with 1.9 in48 mm of precipitation and 7 in19 cm of snow in a typical February.
- Record high
- 73°23° (2024)
- Record low
- −18°−28° (2011)
- Heating degree days
- 1083
- Cooling degree days
- 0
Ransom in March
Highs average 48°9° and lows 27°−3°, with 2.5 in65 mm of precipitation and 2.9 in7.4 cm of snow in a typical March.
- Record high
- 83°28° (2012)
- Record low
- −7°−22° (2002)
- Heating degree days
- 859
- Cooling degree days
- 2
Ransom in April
Highs average 61°16° and lows 37°3°, with 3.6 in91 mm of precipitation and 0.3 in0.8 cm of snow in a typical April.
- Record high
- 90°32° (2002)
- Record low
- 15°−9° (2018)
- Heating degree days
- 478
- Cooling degree days
- 6
Ransom in May
Highs average 73°23° and lows 49°9°, with 4.7 in119 mm of precipitation in a typical May.
- Record high
- 96°36° (2018)
- Record low
- 26°−3° (2005)
- Heating degree days
- 195
- Cooling degree days
- 57
Ransom in June
Highs average 81°27° and lows 58°15°, with 4.9 in125 mm of precipitation in a typical June.
- Record high
- 98°37° (2012)
- Record low
- 38°3° (2003)
- Heating degree days
- 30
- Cooling degree days
- 168
Ransom in July
Highs average 84°29° and lows 62°17°, with 3.9 in98 mm of precipitation in a typical July.
- Record high
- 102°39° (2005)
- Record low
- 45°7° (1977)
- Heating degree days
- 5
- Cooling degree days
- 251
Ransom in August
Highs average 82°28° and lows 61°16°, with 4.1 in104 mm of precipitation in a typical August.
- Record high
- 98°37° (2006)
- Record low
- 45°7° (2009)
- Heating degree days
- 8
- Cooling degree days
- 208
Ransom in September
Highs average 77°25° and lows 53°12°, with 3.5 in88 mm of precipitation in a typical September.
- Record high
- 97°36° (2000)
- Record low
- 31°−1° (2012)
- Heating degree days
- 94
- Cooling degree days
- 94
Ransom in OctoberThis month
Highs average 64°18° and lows 41°5°, with 3.2 in81 mm of precipitation in a typical October.
- Record high
- 90°32° (2018)
- Record low
- 22°−6° (2018)
- Heating degree days
- 398
- Cooling degree days
- 15
Ransom in November
Highs average 49°10° and lows 30°−1°, with 2.7 in69 mm of precipitation and 0.8 in2 cm of snow in a typical November.
- Record high
- 79°26° (2000)
- Record low
- 0°−18° (1976)
- Heating degree days
- 764
- Cooling degree days
- 0
Ransom in December
Highs average 37°3° and lows 21°−6°, with 2.1 in54 mm of precipitation and 5 in13 cm of snow in a typical December.
- Record high
- 71°22° (2012)
- Record low
- −16°−27° (2000)
- Heating degree days
- 1130
- Cooling degree days
- 0