Lewis has cold, snowy winters and pleasant summers
A typical July afternoon reaches 81°, a January night drops to 3°, and about 61 inches of snow falls in a normal winter.
A year in Lewis at a glance
Each month’s typical high and low, and what it brings.
What stands out about Lewis’s climate
Read from where Lewis sits among Wisconsin’s towns. The page puts what stands out first.
About 149 frost-free days a year
In half of years the last 32° night comes by May 6 and the first by October 4.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
Warmer than it used to be
The last 30 years in Lewis averaged 1.9° warmer than the 1900s. The biggest change is in December (+4.1°).
A bigger shift than in 90% of U.S. towns.
Change by month
61 inches of snow, 32 of rain and melt
July is the wettest month and January the driest. Rain or snow falls on about 115 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
What a year in Lewis feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
Living with Lewis’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
149 frost-free days. The last frost comes by May 6 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 4.
About 61" a winter over 21 days with an inch or more, most in December. Snow covers the ground about 108 days a year.
Months averaging under 55° run from October through April. Heating is 94% of the year’s heating-and-cooling load.
About 4 days a year reach 90°, and July afternoons average 81°.
The nicest months are May, June, July, August and September.
Parks & trails →Normals are averages. Ice storms, nor’easters, floods and heat waves are on the natural hazards page.
Natural hazards →Lewis and its neighbors
Siren has the coldest January nights next door (2°) and Daniels 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.
How Lewis compares
Against every U.S. town on TownTapestry, each counted once, with its place in Wisconsin.
Lewis 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 | 21° | 3° | 0.8" | 9.8" | 8 | 29 | 0° – 26° |
| February | 27° | 6° | 0.9" | 12.6" | 7 | 25 | 4° – 30° |
| March | 40° | 19° | 1.5" | 9.0" | 8 | 18 | 20° – 44° |
| April | 54° | 31° | 2.7" | 4.6" | 10 | 3 | 32° – 50° |
| May | 67° | 44° | 3.9" | 0.2" | 12 | 0 | 50° – 63° |
| June | 77° | 54° | 4.3" | 0 | 12 | 0 | 61° – 69° |
| July | 81° | 58° | 4.4" | 0 | 11 | 0 | 63° – 75° |
| August | 79° | 56° | 4.1" | 0 | 11 | 0 | 62° – 71° |
| September | 70° | 48° | 3.5" | 0 | 10 | 0 | 52° – 64° |
| October | 56° | 36° | 3.1" | 1.3" | 11 | 0 | 39° – 51° |
| November | 40° | 23° | 1.8" | 8.4" | 8 | 8 | 22° – 43° |
| December | 27° | 10° | 1.2" | 15.3" | 9 | 24 | 5° – 28° |
| Year | 53° | 32° | 32.2" | 61.2" | 115 | 108 |
Heating and cooling a home in Lewis
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. February swings the most: from 1991 to 2020 its average ranged from 4° to 30°. June is the most reliable, staying within 8°.
Common questions about Lewis’s climate
What is the coldest month in Lewis?
January, with a typical high of 21° and a low of 3°.
What is the hottest month in Lewis?
July, with a typical high of 81° and a low of 58°. About 4 days a year reach 90°.
How much snow does Lewis get?
About 61 inches in a normal winter, most of it in December.
When is the first frost in Lewis?
In half of years the first 32° night comes by October 4, and the last spring frost by May 6.
What is the rainiest month in Lewis?
July, with 4.4 inches of rain and melted snow. The year totals 32 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Lewis.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Lewis itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Luck, WI (11 mi) away. 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.