Port Washington, WI climate
Port Washington has cold, snowy winters and pleasant summers. A typical July afternoon reaches 80°, a January night drops to 15°, and about 42 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Port Washington feels like
Winter
Spring
Summer
Fall
Port Washington weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 29° | 15° | 1.6" | 13.2" | 8 | 21 | 11° – 33° |
| February | 32° | 17° | 1.4" | 10.7" | 7 | 17 | 13° – 34° |
| March | 42° | 26° | 1.9" | 6.0" | 8 | 8 | 25° – 48° |
| April | 52° | 35° | 3.6" | 0.8" | 10 | 1 | 35° – 49° |
| May | 64° | 45° | 3.7" | 0 | 11 | 0 | 49° – 60° |
| June | 74° | 55° | 4.0" | 0 | 10 | 0 | 61° – 70° |
| July | 80° | 62° | 3.5" | 0 | 9 | 0 | 66° – 78° |
| August | 78° | 61° | 3.6" | 0 | 8 | 0 | 65° – 75° |
| September | 71° | 54° | 3.0" | 0 | 8 | 0 | 56° – 67° |
| October | 59° | 42° | 2.7" | 0 | 9 | 0 | 46° – 56° |
| November | 45° | 31° | 2.1" | 0.9" | 8 | 1 | 29° – 46° |
| December | 34° | 21° | 1.8" | 10.7" | 8 | 11 | 15° – 38° |
| Year | 55° | 39° | 32.8" | 42.3" | 103 | 58 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Port Washington
Port Washington gets 33 inches of rain and melted snow a year. June is the wettest month and February the driest. Rain or snow falls on about 103 days a year. Snow covers the ground about 58 days of the year.
About 176 frost-free days a year
In half of years the last 32° night comes by April 27 and the first one by October 22. That leaves about 176 frost-free days for gardens, shorter than 53% of U.S. towns.
Heating and cooling a home in Port Washington
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Port Washington, 94% of that work is heating and 6% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Port Washington and its neighbors
Port Washington borders 2 towns with climate data. January nights across them vary by 1.1°. Port Washington has the coldest January nights (14°) and Grafton the hottest July afternoons (80°). Port Washington’s January low is 15° and its July high 80°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Port Washington compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Port Washington averaged 1.3° warmer than the 1900s. The biggest change is in December (+3.1°). The shift is larger than in 57% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Port Washington’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 15° to 38°. June is the most reliable, staying within 9°.
Common questions about Port Washington’s climate
What is the coldest month in Port Washington?
January, with a typical high of 29° and a low of 15°.
What is the hottest month in Port Washington?
July, with a typical high of 80° and a low of 62°. About 5 days a year reach 90°.
How much snow does Port Washington get?
About 42 inches in a normal winter, most of it in January.
When is the first frost in Port Washington?
In half of years the first 32° night comes by October 22, and the last spring frost by April 27.
What is the rainiest month in Port Washington?
June, with 4.0 inches of rain and melted snow. The year totals 33 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Port Washington itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Port Washington, WI (1 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.