Mettawa weather by month
What a typical year looks like in Mettawa, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at BARRINGTON 3SW, 25 km from Mettawa; records cover 1962–2026.
The year at a glance
- Precipitation a year
- 40.4 in1027 mm
- Snow a year
- 39 in98 cm
- Last spring freeze
- Apr 26
- First fall freeze
- Oct 17
- Heating degree days
- 6,818
- Cooling degree days
- 652
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 90°32° (cooling, 1%).
Month by month
Mettawa in January
Highs average 29°−2° and lows 13°−10°, with 2.1 in53 mm of precipitation and 13 in32 cm of snow in a typical January.
- Record high
- 62°17° (1967)
- Record low
- −28°−33° (2019)
- Heating degree days
- 1362
- Cooling degree days
- 0
Mettawa in February
Highs average 33°0° and lows 16°−9°, with 1.9 in48 mm of precipitation and 9 in22 cm of snow in a typical February.
- Record high
- 74°23° (2024)
- Record low
- −26°−32° (2019)
- Heating degree days
- 1131
- Cooling degree days
- 0
Mettawa in March
Highs average 45°7° and lows 27°−3°, with 2.4 in60 mm of precipitation and 5 in12 cm of snow in a typical March.
- Record high
- 84°29° (2012)
- Record low
- −9°−23° (2002)
- Heating degree days
- 916
- Cooling degree days
- 1
Mettawa in April
Highs average 58°14° and lows 37°3°, with 4 in100 mm of precipitation and 1.1 in2.8 cm of snow in a typical April.
- Record high
- 89°32° (1970)
- Record low
- 5°−15° (1982)
- Heating degree days
- 533
- Cooling degree days
- 4
Mettawa in May
Highs average 69°20° and lows 48°9°, with 5.2 in131 mm of precipitation in a typical May.
- Record high
- 93°34° (1975)
- Record low
- 22°−6° (1966)
- Heating degree days
- 244
- Cooling degree days
- 39
Mettawa in June
Highs average 78°25° and lows 58°15°, with 4.6 in117 mm of precipitation in a typical June.
- Record high
- 102°39° (1971)
- Record low
- 30°−1° (2000)
- Heating degree days
- 53
- Cooling degree days
- 136
Mettawa in July
Highs average 81°27° and lows 63°17°, with 4 in102 mm of precipitation in a typical July.
- Record high
- 103°39° (1974)
- Record low
- 38°3° (1965)
- Heating degree days
- 9
- Cooling degree days
- 224
Mettawa in August
Highs average 79°26° and lows 61°16°, with 4.6 in116 mm of precipitation in a typical August.
- Record high
- 100°38° (1988)
- Record low
- 38°3° (1965)
- Heating degree days
- 14
- Cooling degree days
- 175
Mettawa in September
Highs average 72°22° and lows 54°12°, with 3.7 in93 mm of precipitation in a typical September.
- Record high
- 96°36° (1971)
- Record low
- 25°−4° (1964)
- Heating degree days
- 127
- Cooling degree days
- 67
Mettawa in OctoberThis month
Highs average 60°16° and lows 42°5°, with 3.4 in86 mm of precipitation and 0.1 in0.3 cm of snow in a typical October.
- Record high
- 88°31° (1971)
- Record low
- 14°−10° (1988)
- Heating degree days
- 446
- Cooling degree days
- 6
Mettawa in November
Highs average 46°8° and lows 30°−1°, with 2.6 in66 mm of precipitation and 2 in5.1 cm of snow in a typical November.
- Record high
- 75°24° (1968)
- Record low
- −10°−23° (1976)
- Heating degree days
- 803
- Cooling degree days
- 0
Mettawa in December
Highs average 34°1° and lows 20°−7°, with 2.2 in56 mm of precipitation and 10 in24 cm of snow in a typical December.
- Record high
- 67°19° (2012)
- Record low
- −20°−29° (1983)
- Heating degree days
- 1180
- Cooling degree days
- 0