Midwinter lows in Dayton sink below those of 94% of U.S. towns
On a normal July day the thermometer tops out near 82°. The year swings widely: the coldest month’s nights and the warmest month’s afternoons are 72° apart. By July afternoons alone, it runs cooler than 84% of U.S. towns. Long walks are most pleasant from May to September, when afternoons reach 69–82°.
A year in Dayton at a glance
Each month’s typical high and low, and what it brings.
What stands out about Dayton’s climate
Compared with towns across the U.S., with Dayton’s place in Wisconsin beside it.
What a year in Dayton feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 154 frost-free days a year
In half of years the last 32° night comes by May 5 and the first by October 6. Frost and day counts come from NOAA’s station at Richland Ctr, WI, 5 miles from the town’s center, 250 ft lower.
The 2023 USDA map puts Dayton’s center in zone 5a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −19°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 40 inches of snow a winter
Snow, measured at Richland Ctr, WI, falls mostly in January and December. Precipitation (rain plus melted snow) adds up to 38 inches a year; June is the wettest month and February the driest. Rain or snow falls on about 120 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Dayton
93% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Richland Ctr, WI.
Living with Dayton’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
154 frost-free days in zone 5a. The last frost comes by May 5 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 6.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 1.3 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Dayton from natural hazards, river flooding is the largest share (64%); heat waves, cold waves, winter storms and ice storms together are 17%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Dayton and its neighbors
Eagle the hottest July afternoons (83°, 1° warmer). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Dayton’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Dayton, WI | 9° | 82° | 38" | 40" |
| Colchester, VT | 10° | 81° | 38" | 50" |
| Faribault, MN | 6° | 82° | 35" | 43" |
| Plattsburgh, NY | 9° | 81° | 35" | 50" |
| Iowa Falls, IA | 9° | 83° | 37" | 28" |
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 Dayton averaged 1.1° warmer than the 1900s. The biggest change is in December (+3.0°).
A smaller shift than in 71% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Dayton compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Dayton’s place among Wisconsin’s.
Dayton weather by month
Highs, lows and precipitation from NOAA’s grid at Dayton’s center; snow, wet days and snow on the ground from Richland Ctr, WI. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 26° | 9° | 1.2" | 11.3" | 10 | 23 | 7° – 31° |
| February | 31° | 13° | 1.2" | 9.8" | 8 | 21 | 9° – 34° |
| March | 44° | 24° | 2.1" | 5.0" | 8 | 11 | 26° – 49° |
| April | 57° | 35° | 3.8" | 1.1" | 12 | 1 | 37° – 52° |
| May | 69° | 46° | 4.5" | 0.0" | 13 | 0 | 51° – 65° |
| June | 78° | 56° | 5.6" | 0.0" | 12 | 0 | 64° – 72° |
| July | 82° | 61° | 4.7" | 0.0" | 11 | 0 | 65° – 78° |
| August | 80° | 59° | 4.3" | 0.0" | 10 | 0 | 64° – 75° |
| September | 73° | 50° | 4.0" | 0.0" | 10 | 0 | 55° – 67° |
| October | 60° | 38° | 2.8" | 0.1" | 10 | 0 | 44° – 55° |
| November | 44° | 27° | 2.0" | 2.4" | 8 | 3 | 27° – 46° |
| December | 32° | 16° | 1.5" | 10.7" | 10 | 17 | 10° – 34° |
| Year | 56° | 36° | 37.5" | 40.4" | 120 | 76 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 9° to 34°. June is the most reliable, staying within 8°.
Where Dayton’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Dayton’s center.
- Snow: Richland Ctr, WI.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Richland Ctr, WI, 5 miles from the town’s center, 250 ft lower; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Dayton’s climate
What is the weather like in Dayton?
A typical July afternoon reaches 82°, a January night drops to 9°, and about 40 inches of snow falls in a normal winter. Colder January nights than 94% of U.S. towns; cooler July afternoons than 84% of U.S. towns.
How cold does it get in Dayton in winter?
January nights average 9°. About 166 nights a year reach 32° or below and 24 reach 0° or below. In the coldest January of the last 30 years the month averaged 7°.
How much snow does Dayton get?
About 40 inches in a normal winter at Richland Ctr, WI, most of it in January and December, with snow on the ground about 76 days a year.
How hot does it get in Dayton?
July, with a typical high of 82° and a low of 61°. About 9 days a year reach 90° (Richland Ctr, WI).
When is the first and last frost in Dayton?
In half of years the last spring frost (32°) comes by May 5 and the first fall frost by October 6, about 154 frost-free days, at Richland Ctr, WI.
What growing zone is Dayton in?
Zone 5a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −19°.
What is the best time of year to visit Dayton?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Dayton getting warmer?
Yes: 1991–2020 averaged 1.1° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 71% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Dayton.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.