Trenton has cold, snowy winters and pleasant summers
A typical July afternoon reaches 81°, a January night drops to 12°, and about 54 inches of snow falls in a normal winter.
A year in Trenton at a glance
Each month’s typical high and low, and what it brings.
What stands out about Trenton’s climate
Read from where Trenton sits among Wisconsin’s towns. The page puts what stands out first.
What a year in Trenton feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
54 inches of snow, 33 of rain and melt
June is the wettest month and February the driest. Rain or snow falls on about 125 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
About 157 frost-free days a year
In half of years the last 32° night comes by May 4 and the first by October 11.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
Living with Trenton’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
157 frost-free days. The last frost comes by May 4 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 11.
About 54" a winter over 16 days with an inch or more, most in January. Snow covers the ground about 70 days a year.
Months averaging under 55° run from October through April. Heating is 94% of the year’s heating-and-cooling load.
About 9 days a year reach 90°, and July afternoons average 81°.
The nicest months are May, June, July, August and September. 1.2 miles of trails are waiting.
Parks & trails →Normals are averages. Ice storms, nor’easters, floods and heat waves are on the natural hazards page.
Natural hazards →Trenton and its neighbors
West Bend has the coldest January nights next door (11°) and Jackson the hottest July afternoons (81°). Tap a town to see its climate.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Trenton averaged 1.3° warmer than the 1900s. The biggest change is in December (+3.2°).
A bigger shift than in 58% of U.S. towns.
Change by month
How Trenton compares
Against every U.S. town on TownTapestry, each counted once, with its place in Wisconsin.
Trenton 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 | 27° | 12° | 1.5" | 16.5" | 10 | 23 | 9° – 31° |
| February | 31° | 15° | 1.4" | 16.0" | 8 | 19 | 11° – 33° |
| March | 42° | 24° | 1.9" | 6.5" | 9 | 9 | 24° – 47° |
| April | 55° | 34° | 3.6" | 2.0" | 11 | 1 | 35° – 50° |
| May | 67° | 45° | 3.7" | 0.3" | 13 | 0 | 50° – 61° |
| June | 77° | 55° | 4.4" | 0 | 12 | 0 | 62° – 71° |
| July | 81° | 60° | 3.6" | 0 | 11 | 0 | 66° – 77° |
| August | 79° | 58° | 3.7" | 0 | 11 | 0 | 63° – 75° |
| September | 72° | 51° | 3.1" | 0 | 10 | 0 | 55° – 66° |
| October | 59° | 39° | 2.7" | 0.3" | 12 | 0 | 45° – 55° |
| November | 45° | 28° | 2.0" | 2.4" | 10 | 3 | 27° – 45° |
| December | 33° | 18° | 1.7" | 10.3" | 9 | 15 | 12° – 36° |
| Year | 56° | 36° | 33.3" | 54.3" | 125 | 70 |
Heating and cooling a home in Trenton
94% of the work is heating, so the furnace matters far more than the air conditioner.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. Source: NOAA station normals.
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 12° to 36°. June is the most reliable, staying within 9°.
Common questions about Trenton’s climate
What is the coldest month in Trenton?
January, with a typical high of 27° and a low of 12°.
What is the hottest month in Trenton?
July, with a typical high of 81° and a low of 60°. About 9 days a year reach 90°.
How much snow does Trenton get?
About 54 inches in a normal winter, most of it in January.
When is the first frost in Trenton?
In half of years the first 32° night comes by October 11, and the last spring frost by May 4.
What is the rainiest month in Trenton?
June, with 4.4 inches of rain and melted snow. The year totals 33 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Trenton.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Trenton itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Germantown, WI (11 mi, snow) and West Bend, WI (2 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Today’s forecast: National Weather Service.