Delavan Lake has cold, snowy winters and pleasant summers
A typical July afternoon reaches 83°, a January night drops to 13°, and about 34 inches of snow falls in a normal winter.
A year in Delavan Lake at a glance
Each month’s typical high and low, and what it brings.
What stands out about Delavan Lake’s climate
Read from where Delavan Lake sits among Wisconsin’s towns. The page puts what stands out first.
34 inches of snow, 37 of rain and melt
June is the wettest month and February the driest. Rain or snow falls on about 128 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
About 168 frost-free days a year
In half of years the last 32° night comes by April 28 and the first by October 14.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
What a year in Delavan Lake feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
Living with Delavan Lake’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
168 frost-free days. The last frost comes by Apr 28 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 14.
About 34" a winter over 12 days with an inch or more, most in February. Snow covers the ground about 62 days a year.
Months averaging under 55° run from October through April. Heating is 92% of the year’s heating-and-cooling load.
About 13 days a year reach 90°, and July afternoons average 83°.
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 →Warmer than it used to be
The last 30 years in Delavan Lake averaged 1.0° warmer than the 1900s. The biggest change is in December (+2.5°).
A smaller shift than in 72% of U.S. towns.
Change by month
Delavan Lake and its neighbors
Delavan has the coldest January nights next door (12°) and Delavan the hottest July afternoons (83°). 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 Delavan Lake compares
Against every U.S. town on TownTapestry, each counted once, with its place in Wisconsin.
Delavan Lake 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 | 28° | 13° | 1.7" | 8.5" | 10 | 21 | 11° – 32° |
| February | 32° | 16° | 1.6" | 9.9" | 9 | 19 | 12° – 35° |
| March | 44° | 26° | 2.2" | 4.4" | 9 | 8 | 27° – 50° |
| April | 57° | 36° | 3.8" | 0.7" | 12 | 1 | 38° – 53° |
| May | 69° | 47° | 4.2" | 0.1" | 14 | 0 | 52° – 64° |
| June | 79° | 57° | 5.0" | 0 | 12 | 0 | 65° – 73° |
| July | 83° | 61° | 3.8" | 0 | 10 | 0 | 67° – 79° |
| August | 81° | 59° | 4.1" | 0 | 11 | 0 | 65° – 76° |
| September | 74° | 52° | 3.5" | 0 | 11 | 0 | 56° – 67° |
| October | 61° | 40° | 3.0" | 0.1" | 12 | 0 | 46° – 56° |
| November | 46° | 29° | 2.4" | 1.2" | 9 | 2 | 29° – 47° |
| December | 33° | 19° | 2.0" | 9.0" | 10 | 12 | 13° – 37° |
| Year | 57° | 38° | 37.0" | 33.9" | 128 | 62 |
Heating and cooling a home in Delavan Lake
92% 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 13° to 37°. June is the most reliable, staying within 8°.
Common questions about Delavan Lake’s climate
What is the coldest month in Delavan Lake?
January, with a typical high of 28° and a low of 13°.
What is the hottest month in Delavan Lake?
July, with a typical high of 83° and a low of 61°. About 13 days a year reach 90°.
How much snow does Delavan Lake get?
About 34 inches in a normal winter, most of it in February.
When is the first frost in Delavan Lake?
In half of years the first 32° night comes by October 14, and the last spring frost by April 28.
What is the rainiest month in Delavan Lake?
June, with 5.0 inches of rain and melted snow. The year totals 37 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Delavan Lake.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Delavan Lake itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Whitewater, WI (18 mi, snow) and Delavan WWTP, WI (3 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.