Winter nights in Caledonia are colder than in 95% of U.S. towns
High summer brings afternoon highs near 81°. The seasons are far apart: from a winter night to a summer afternoon the average spans 72°. Its July afternoons stay fresher than in 85% of U.S. towns. Radiators earn their keep from October to April, the months that average under 50°.
A year in Caledonia at a glance
Each month’s typical high and low, and what it brings.
What stands out about Caledonia’s climate
Compared with towns across the U.S., with Caledonia’s place in Wisconsin beside it.
What a year in Caledonia feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 153 frost-free days a year
In half of years the last 32° night comes by May 4 and the first by October 6. Frost and day counts come from NOAA’s station at New London, WI, 6 miles from the town’s center, at about the same height.
The 2023 USDA map puts Caledonia’s center in zone 5a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −16°. 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 46 inches of snow a winter
Snow, measured at New London, WI, falls mostly in January, February and December. Precipitation (rain plus melted snow) adds up to 33 inches a year; June is the wettest month and February the driest. Rain or snow falls on about 110 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Caledonia
94% 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 New London, WI.
Living with Caledonia’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
153 frost-free days in zone 5a. 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 6.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 2.4 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Caledonia from natural hazards, river flooding is the largest share (55%); heat waves, cold waves, winter storms and ice storms together are 25%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Caledonia and its neighbors
Every town next door is within a degree of Caledonia in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Caledonia’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 |
|---|---|---|---|---|
| Caledonia, WI | 9° | 81° | 33" | 46" |
| Plattsburgh, NY | 9° | 81° | 35" | 50" |
| Lakeville, MN | 7° | 82° | 33" | 41" |
| Clear Lake, IA | 7° | 82° | 36" | 44" |
| Colchester, VT | 10° | 81° | 38" | 50" |
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 Caledonia averaged 1.5° warmer than the 1900s. The biggest change is in December (+3.2°).
A bigger shift than in 62% 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 Caledonia compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Caledonia’s place among Wisconsin’s.
Caledonia weather by month
Highs, lows and precipitation from NOAA’s grid at Caledonia’s center; snow, wet days and snow on the ground from New London, WI. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 25° | 9° | 1.2" | 10.8" | 8 | 28 | 6° – 29° |
| February | 29° | 12° | 1.1" | 11.0" | 5 | 23 | 9° – 31° |
| March | 41° | 22° | 1.9" | 6.8" | 8 | 16 | 23° – 47° |
| April | 55° | 33° | 3.2" | 3.7" | 10 | 2 | 34° – 51° |
| May | 68° | 45° | 3.8" | 0.0" | 12 | 0 | 50° – 63° |
| June | 77° | 55° | 4.6" | 0.0" | 11 | 0 | 62° – 71° |
| July | 81° | 59° | 3.8" | 0.0" | 10 | 0 | 64° – 76° |
| August | 79° | 57° | 3.6" | 0.0" | 10 | 0 | 64° – 73° |
| September | 72° | 50° | 3.5" | 0.0" | 10 | 0 | 54° – 66° |
| October | 58° | 38° | 2.8" | 0.2" | 10 | 0 | 43° – 55° |
| November | 43° | 27° | 2.0" | 2.4" | 7 | 2 | 26° – 44° |
| December | 30° | 16° | 1.6" | 11.0" | 8 | 15 | 11° – 34° |
| Year | 55° | 35° | 33.0" | 45.9" | 110 | 85 |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 23° to 47°. August is the most reliable, staying within 9°.
Where Caledonia’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 Caledonia’s center.
- Snow: New London, WI.
- Frost, freezing nights, 90° and 100° days, heating and cooling: New London, WI, 6 miles from the town’s center, at about the same height; 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 Caledonia’s climate
What is the weather like in Caledonia?
A typical July afternoon reaches 81°, a January night drops to 9°, and about 46 inches of snow falls in a normal winter. Colder January nights than 95% of U.S. towns; cooler July afternoons than 85% of U.S. towns.
How cold does it get in Caledonia in winter?
January nights average 9°. About 164 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 6°.
How much snow does Caledonia get?
About 46 inches in a normal winter at New London, WI, most of it in January, February and December, with snow on the ground about 85 days a year.
How hot does it get in Caledonia?
July, with a typical high of 81° and a low of 59°. About 6 days a year reach 90° (New London, WI).
When is the first and last frost in Caledonia?
In half of years the last spring frost (32°) comes by May 4 and the first fall frost by October 6, about 153 frost-free days, at New London, WI.
What growing zone is Caledonia in?
Zone 5a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −16°.
What is the best time of year to visit Caledonia?
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 Caledonia getting warmer?
Yes: 1991–2020 averaged 1.5° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 62% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Caledonia.
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.