New Grand Chain weather by month
What a typical year looks like in New Grand Chain, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Olmsted Lock And Dam, 9 km from New Grand Chain; records cover 1923–2026.
The year at a glance
- Precipitation a year
- 49.4 in1255 mm
- Snow a year
- 7 in18 cm
- Last spring freeze
- Mar 26
- First fall freeze
- Nov 4
- Heating degree days
- 4,102
- Cooling degree days
- 1,547
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 8°−13° (heating, 99%) and 96°36° (cooling, 1%).
Month by month
New Grand Chain in January
Highs average 43°6° and lows 26°−3°, with 4.2 in107 mm of precipitation and 2.1 in5.3 cm of snow in a typical January.
- Record high
- 71°22° (1928)
- Record low
- −4°−20° (1924)
- Heating degree days
- 941
- Cooling degree days
- 0
New Grand Chain in February
Highs average 48°9° and lows 30°−1°, with 3.9 in98 mm of precipitation and 2.5 in6.4 cm of snow in a typical February.
- Record high
- 76°24° (2017)
- Record low
- −8°−22° (2015)
- Heating degree days
- 738
- Cooling degree days
- 0
New Grand Chain in March
Highs average 57°14° and lows 37°3°, with 4.8 in121 mm of precipitation and 0.7 in1.8 cm of snow in a typical March.
- Record high
- 81°27° (1925)
- Record low
- −1°−18° (2015)
- Heating degree days
- 558
- Cooling degree days
- 2
New Grand Chain in April
Highs average 68°20° and lows 47°8°, with 5.2 in131 mm of precipitation in a typical April.
- Record high
- 89°32° (1925)
- Record low
- 15°−9° (2000)
- Heating degree days
- 248
- Cooling degree days
- 23
New Grand Chain in May
Highs average 77°25° and lows 56°14°, with 4.9 in125 mm of precipitation in a typical May.
- Record high
- 96°36° (1925)
- Record low
- 35°2° (1925)
- Heating degree days
- 71
- Cooling degree days
- 121
New Grand Chain in June
Highs average 86°30° and lows 65°18°, with 4.1 in105 mm of precipitation in a typical June.
- Record high
- 104°40° (2012)
- Record low
- 43°6° (2000)
- Heating degree days
- 5
- Cooling degree days
- 310
New Grand Chain in July
Highs average 89°32° and lows 69°20°, with 3.3 in83 mm of precipitation in a typical July.
- Record high
- 105°41° (2012)
- Record low
- 0°−18° (2001)
- Heating degree days
- 0
- Cooling degree days
- 430
New Grand Chain in August
Highs average 89°31° and lows 67°20°, with 3 in77 mm of precipitation in a typical August.
- Record high
- 104°40° (1925)
- Record low
- 0°−18° (2001)
- Heating degree days
- 0
- Cooling degree days
- 400
New Grand Chain in September
Highs average 83°28° and lows 60°16°, with 3.4 in85 mm of precipitation in a typical September.
- Record high
- 108°42° (1925)
- Record low
- 36°2° (1928)
- Heating degree days
- 22
- Cooling degree days
- 215
New Grand Chain in OctoberThis month
Highs average 71°22° and lows 48°9°, with 4 in103 mm of precipitation and 0.1 in0.3 cm of snow in a typical October.
- Record high
- 94°34° (2019)
- Record low
- 23°−5° (1925)
- Heating degree days
- 204
- Cooling degree days
- 43
New Grand Chain in November
Highs average 58°14° and lows 39°4°, with 4.4 in112 mm of precipitation in a typical November.
- Record high
- 80°27° (1924)
- Record low
- 12°−11° (2014)
- Heating degree days
- 506
- Cooling degree days
- 3
New Grand Chain in December
Highs average 47°8° and lows 31°−1°, with 4.2 in108 mm of precipitation and 1.8 in4.6 cm of snow in a typical December.
- Record high
- 74°23° (2021)
- Record low
- −8°−22° (2022)
- Heating degree days
- 809
- Cooling degree days
- 0