Port Washington weather by month
What a typical year looks like in Port Washington, Wisconsin: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Jackson, 24 km from Port Washington; records cover 2001–2026.
The year at a glance
- Precipitation a year
- 32.6 in828 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 30
- First fall freeze
- Oct 16
- Heating degree days
- 7,179
- Cooling degree days
- 556
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −8°−22° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
Port Washington in January
Highs average 28°−2° and lows 13°−11°, with 1.4 in35 mm of precipitation in a typical January.
- Record high
- 58°14° (2013)
- Record low
- −23°−31° (2019)
- Heating degree days
- 1387
- Cooling degree days
- 0
Port Washington in February
Highs average 32°0° and lows 15°−9°, with 1.6 in41 mm of precipitation in a typical February.
- Record high
- 71°22° (2024)
- Record low
- −23°−31° (2019)
- Heating degree days
- 1165
- Cooling degree days
- 0
Port Washington in March
Highs average 42°6° and lows 25°−4°, with 1.8 in45 mm of precipitation in a typical March.
- Record high
- 83°28° (2012)
- Record low
- −11°−24° (2014)
- Heating degree days
- 985
- Cooling degree days
- 1
Port Washington in April
Highs average 54°12° and lows 35°2°, with 3.5 in90 mm of precipitation in a typical April.
- Record high
- 88°31° (2002)
- Record low
- 16°−9° (2018)
- Heating degree days
- 611
- Cooling degree days
- 1
Port Washington in May
Highs average 67°19° and lows 46°8°, with 3.4 in85 mm of precipitation in a typical May.
- Record high
- 96°36° (2018)
- Record low
- 26°−3° (2004)
- Heating degree days
- 293
- Cooling degree days
- 23
Port Washington in June
Highs average 77°25° and lows 55°13°, with 4 in102 mm of precipitation in a typical June.
- Record high
- 99°37° (2022)
- Record low
- 36°2° (2003)
- Heating degree days
- 66
- Cooling degree days
- 104
Port Washington in July
Highs average 82°28° and lows 60°16°, with 4 in101 mm of precipitation in a typical July.
- Record high
- 103°39° (2012)
- Record low
- 46°8° (2004)
- Heating degree days
- 14
- Cooling degree days
- 204
Port Washington in August
Highs average 80°27° and lows 59°15°, with 3.3 in84 mm of precipitation in a typical August.
- Record high
- 99°37° (2023)
- Record low
- 42°6° (2009)
- Heating degree days
- 20
- Cooling degree days
- 158
Port Washington in September
Highs average 73°23° and lows 52°11°, with 3 in75 mm of precipitation in a typical September.
- Record high
- 94°34° (2013)
- Record low
- 31°−1° (2012)
- Heating degree days
- 143
- Cooling degree days
- 60
Port Washington in OctoberThis month
Highs average 61°16° and lows 40°5°, with 2.8 in71 mm of precipitation in a typical October.
- Record high
- 88°31° (2025)
- Record low
- 18°−8° (2020)
- Heating degree days
- 461
- Cooling degree days
- 5
Port Washington in November
Highs average 46°8° and lows 29°−2°, with 2 in51 mm of precipitation in a typical November.
- Record high
- 76°24° (2015)
- Record low
- 5°−15° (2014)
- Heating degree days
- 836
- Cooling degree days
- 0
Port Washington in December
Highs average 34°1° and lows 19°−7°, with 1.9 in49 mm of precipitation in a typical December.
- Record high
- 66°19° (2021)
- Record low
- −10°−23° (2010)
- Heating degree days
- 1198
- Cooling degree days
- 0