Brillion weather by month
What a typical year looks like in Brillion, Wisconsin: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Chilton, 17 km from Brillion; records cover 1894–2026.
The year at a glance
- Precipitation a year
- 33.9 in860 mm
- Snow a year
- 44 in110 cm
- Last spring freeze
- May 4
- First fall freeze
- Oct 11
- Heating degree days
- 7,550
- Cooling degree days
- 557
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −10°−23° (heating, 99%) and 91°33° (cooling, 1%).
Month by month
Brillion in January
Highs average 26°−4° and lows 10°−12°, with 1.5 in38 mm of precipitation and 11 in29 cm of snow in a typical January.
- Record high
- 57°14° (1947)
- Record low
- −33°−36° (1951)
- Heating degree days
- 1464
- Cooling degree days
- 0
Brillion in February
Highs average 29°−1° and lows 12°−11°, with 1.3 in33 mm of precipitation and 11 in29 cm of snow in a typical February.
- Record high
- 71°22° (2024)
- Record low
- −34°−37° (1899)
- Heating degree days
- 1237
- Cooling degree days
- 0
Brillion in March
Highs average 41°5° and lows 22°−5°, with 1.9 in49 mm of precipitation and 6 in15 cm of snow in a typical March.
- Record high
- 84°29° (2012)
- Record low
- −28°−33° (1962)
- Heating degree days
- 1034
- Cooling degree days
- 0
Brillion in April
Highs average 54°12° and lows 34°1°, with 3.1 in78 mm of precipitation and 2.6 in6.6 cm of snow in a typical April.
- Record high
- 89°32° (1980)
- Record low
- 8°−13° (1954)
- Heating degree days
- 630
- Cooling degree days
- 2
Brillion in May
Highs average 67°20° and lows 45°7°, with 3.8 in96 mm of precipitation and 0.1 in0.3 cm of snow in a typical May.
- Record high
- 95°35° (2018)
- Record low
- 20°−7° (1908)
- Heating degree days
- 293
- Cooling degree days
- 27
Brillion in June
Highs average 77°25° and lows 56°13°, with 4.7 in120 mm of precipitation in a typical June.
- Record high
- 99°37° (1988)
- Record low
- 31°−1° (1945)
- Heating degree days
- 66
- Cooling degree days
- 114
Brillion in July
Highs average 82°28° and lows 61°16°, with 3.9 in99 mm of precipitation in a typical July.
- Record high
- 103°39° (1995)
- Record low
- 33°1° (1898)
- Heating degree days
- 13
- Cooling degree days
- 201
Brillion in August
Highs average 80°26° and lows 59°15°, with 3.6 in91 mm of precipitation in a typical August.
- Record high
- 100°38° (1947)
- Record low
- 38°3° (1965)
- Heating degree days
- 25
- Cooling degree days
- 155
Brillion in September
Highs average 73°23° and lows 51°10°, with 3.3 in84 mm of precipitation in a typical September.
- Record high
- 97°36° (1897)
- Record low
- 24°−4° (1949)
- Heating degree days
- 156
- Cooling degree days
- 54
Brillion in OctoberThis month
Highs average 59°15° and lows 39°4°, with 3 in76 mm of precipitation and 0.6 in1.5 cm of snow in a typical October.
- Record high
- 88°31° (1910)
- Record low
- 10°−12° (1895)
- Heating degree days
- 502
- Cooling degree days
- 4
Brillion in November
Highs average 44°7° and lows 28°−2°, with 2.1 in53 mm of precipitation and 1.9 in4.8 cm of snow in a typical November.
- Record high
- 78°26° (1944)
- Record low
- −9°−23° (1950)
- Heating degree days
- 870
- Cooling degree days
- 0
Brillion in December
Highs average 31°0° and lows 17°−8°, with 1.7 in42 mm of precipitation and 10 in25 cm of snow in a typical December.
- Record high
- 65°18° (2001)
- Record low
- −21°−29° (1903)
- Heating degree days
- 1260
- Cooling degree days
- 0