Green Lake weather by month
What a typical year looks like in Green Lake, Wisconsin: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Berlin Wwtp, 16 km from Green Lake; records cover 2004–2026.
The year at a glance
- Precipitation a year
- 35.2 in894 mm
- Snow a year
- Rare
- Last spring freeze
- May 7
- First fall freeze
- Oct 5
- Heating degree days
- 7,736
- Cooling degree days
- 501
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −13°−25° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
Green Lake in January
Highs average 25°−4° and lows 8°−13°, with 1.4 in35 mm of precipitation in a typical January.
- Record high
- 56°13° (2025)
- Record low
- −27°−33° (2019)
- Heating degree days
- 1492
- Cooling degree days
- 0
Green Lake in February
Highs average 30°−1° and lows 11°−12°, with 1.3 in33 mm of precipitation in a typical February.
- Record high
- 72°22° (2024)
- Record low
- −27°−33° (2019)
- Heating degree days
- 1254
- Cooling degree days
- 0
Green Lake in March
Highs average 41°5° and lows 21°−6°, with 2.8 in72 mm of precipitation in a typical March.
- Record high
- 81°27° (2007)
- Record low
- −17°−27° (2014)
- Heating degree days
- 1052
- Cooling degree days
- 1
Green Lake in April
Highs average 55°13° and lows 33°1°, with 3.6 in91 mm of precipitation in a typical April.
- Record high
- 86°30° (2007)
- Record low
- 12°−11° (2018)
- Heating degree days
- 636
- Cooling degree days
- 0
Green Lake in May
Highs average 67°20° and lows 46°8°, with 4.2 in107 mm of precipitation in a typical May.
- Record high
- 95°35° (2018)
- Record low
- 27°−3° (2020)
- Heating degree days
- 287
- Cooling degree days
- 23
Green Lake in June
Highs average 77°25° and lows 56°13°, with 4.2 in107 mm of precipitation in a typical June.
- Record high
- 95°35° (2005)
- Record low
- 38°3° (2015)
- Heating degree days
- 58
- Cooling degree days
- 102
Green Lake in July
Highs average 81°27° and lows 60°15°, with 4.5 in115 mm of precipitation in a typical July.
- Record high
- 105°41° (2012)
- Record low
- 46°8° (2014)
- Heating degree days
- 14
- Cooling degree days
- 186
Green Lake in August
Highs average 80°26° and lows 58°14°, with 3.6 in92 mm of precipitation in a typical August.
- Record high
- 99°37° (2023)
- Record low
- 41°5° (2009)
- Heating degree days
- 26
- Cooling degree days
- 139
Green Lake in September
Highs average 72°22° and lows 49°10°, with 3.5 in89 mm of precipitation in a typical September.
- Record high
- 95°35° (2023)
- Record low
- 30°−1° (2004)
- Heating degree days
- 173
- Cooling degree days
- 46
Green Lake in OctoberThis month
Highs average 58°15° and lows 38°3°, with 2.7 in70 mm of precipitation in a typical October.
- Record high
- 88°31° (2025)
- Record low
- 20°−7° (2023)
- Heating degree days
- 530
- Cooling degree days
- 4
Green Lake in November
Highs average 43°6° and lows 26°−3°, with 2 in51 mm of precipitation in a typical November.
- Record high
- 74°23° (2008)
- Record low
- 2°−17° (2014)
- Heating degree days
- 917
- Cooling degree days
- 0
Green Lake in December
Highs average 31°−1° and lows 15°−9°, with 1.4 in34 mm of precipitation in a typical December.
- Record high
- 64°18° (2021)
- Record low
- −16°−27° (2004)
- Heating degree days
- 1297
- Cooling degree days
- 0