Harmony weather by month
What a typical year looks like in Harmony, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at ELGIN WATER, 23 km from Harmony; records cover 1983–2026.
The year at a glance
- Precipitation a year
- 39.9 in1012 mm
- Snow a year
- 32 in82 cm
- Last spring freeze
- Apr 25
- First fall freeze
- Oct 14
- Heating degree days
- 6,592
- Cooling degree days
- 808
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −7°−22° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Harmony in January
Highs average 30°−1° and lows 14°−10°, with 2 in51 mm of precipitation and 10 in24 cm of snow in a typical January.
- Record high
- 63°17° (2008)
- Record low
- −27°−33° (1985)
- Heating degree days
- 1330
- Cooling degree days
- 0
Harmony in February
Highs average 34°1° and lows 17°−8°, with 1.9 in47 mm of precipitation and 8 in20 cm of snow in a typical February.
- Record high
- 74°23° (2024)
- Record low
- −25°−32° (2019)
- Heating degree days
- 1106
- Cooling degree days
- 0
Harmony in March
Highs average 46°8° and lows 26°−3°, with 2.4 in60 mm of precipitation and 4 in9 cm of snow in a typical March.
- Record high
- 83°28° (2012)
- Record low
- −9°−23° (2015)
- Heating degree days
- 894
- Cooling degree days
- 1
Harmony in April
Highs average 59°15° and lows 37°3°, with 4 in101 mm of precipitation and 0.8 in2 cm of snow in a typical April.
- Record high
- 91°33° (1986)
- Record low
- 11°−12° (1987)
- Heating degree days
- 519
- Cooling degree days
- 4
Harmony in May
Highs average 70°21° and lows 48°9°, with 5.1 in130 mm of precipitation in a typical May.
- Record high
- 97°36° (2018)
- Record low
- 28°−2° (2004)
- Heating degree days
- 224
- Cooling degree days
- 48
Harmony in June
Highs average 80°27° and lows 58°15°, with 4.5 in113 mm of precipitation in a typical June.
- Record high
- 101°38° (1988)
- Record low
- 36°2° (2003)
- Heating degree days
- 40
- Cooling degree days
- 168
Harmony in July
Highs average 84°29° and lows 63°17°, with 4 in101 mm of precipitation in a typical July.
- Record high
- 102°39° (2012)
- Record low
- 45°7° (1983)
- Heating degree days
- 4
- Cooling degree days
- 273
Harmony in August
Highs average 82°28° and lows 61°16°, with 4.3 in110 mm of precipitation in a typical August.
- Record high
- 98°37° (1988)
- Record low
- 40°4° (1986)
- Heating degree days
- 10
- Cooling degree days
- 219
Harmony in September
Highs average 76°24° and lows 53°12°, with 3.5 in90 mm of precipitation in a typical September.
- Record high
- 95°35° (1990)
- Record low
- 29°−2° (1995)
- Heating degree days
- 109
- Cooling degree days
- 86
Harmony in OctoberThis month
Highs average 63°17° and lows 41°5°, with 3.3 in84 mm of precipitation in a typical October.
- Record high
- 89°32° (2010)
- Record low
- 18°−8° (1988)
- Heating degree days
- 418
- Cooling degree days
- 9
Harmony in November
Highs average 48°9° and lows 30°−1°, with 2.7 in68 mm of precipitation and 1.4 in3.6 cm of snow in a typical November.
- Record high
- 76°24° (2016)
- Record low
- 4°−16° (1986)
- Heating degree days
- 785
- Cooling degree days
- 0
Harmony in December
Highs average 36°2° and lows 20°−7°, with 2.2 in56 mm of precipitation and 9 in22 cm of snow in a typical December.
- Record high
- 68°20° (2012)
- Record low
- −24°−31° (1983)
- Heating degree days
- 1153
- Cooling degree days
- 0