Winter nights in Jefferson Township are colder than in 94% of U.S. towns
Expect July afternoons of about 82°. The gap between a January night and a July afternoon is 73°. In July, afternoons here are cooler than in 81% of U.S. towns. Tender plants can go out after about April 22; in half of years the first frost comes by October 17.
A year in Jefferson Township at a glance
Each month’s typical high and low, and what it brings.
What stands out about Jefferson Township’s climate
Compared with towns across the U.S., with Jefferson Township’s place in Minnesota beside it.
What a year in Jefferson Township feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 178 frost-free days a year
In half of years the last 32° night comes by April 22 and the first by October 17. Frost and day counts come from NOAA’s station at Genoa Dam 8, WI, 5 miles from the town’s center, 190 ft lower.
The 2023 USDA map puts Jefferson Township’s center in zone 5a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −18°. 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 35 inches of snow a winter
Snow, measured at Genoa Dam 8, WI, falls mostly in January, February and December. Precipitation (rain plus melted snow) adds up to 37 inches a year; June is the wettest month and January the driest. Rain or snow falls on about 118 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Jefferson Township
89% 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 Genoa Dam 8, WI.
Living with Jefferson Township’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
178 frost-free days in zone 5a. The last frost comes by Apr 22 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 17.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 2.0 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Jefferson Township from natural hazards, river flooding is the largest share (55%); heat waves, cold waves, winter storms and ice storms together are 19%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Jefferson Township and its neighbors
Every town next door is within a degree of Jefferson Township in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Jefferson Township’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 |
|---|---|---|---|---|
| Jefferson Township, MN | 9° | 82° | 37" | 35" |
| Delafield, WI | 12° | 82° | 36" | 37" |
| Harvard, IL | 13° | 83° | 38" | 32" |
| Boone, IA | 11° | 84° | 36" | 36" |
| 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 Jefferson Township averaged 1.0° warmer than the 1900s. The biggest change is in December (+2.7°).
A smaller shift than in 78% 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 Jefferson Township compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Jefferson Township’s place among Minnesota’s.
Jefferson Township weather by month
Highs, lows and precipitation from NOAA’s grid at Jefferson Township’s center; snow, wet days and snow on the ground from Genoa Dam 8, WI. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 25° | 9° | 1.1" | 9.1" | 9 | 23 | 7° – 31° |
| February | 30° | 13° | 1.1" | 9.3" | 8 | 20 | 9° – 33° |
| March | 43° | 25° | 1.9" | 4.9" | 9 | 9 | 26° – 49° |
| April | 57° | 36° | 4.0" | 1.3" | 12 | 1 | 37° – 54° |
| May | 69° | 48° | 4.8" | 0.0" | 13 | 0 | 53° – 65° |
| June | 78° | 58° | 5.8" | 0.0" | 12 | 0 | 65° – 72° |
| July | 82° | 62° | 4.3" | 0.0" | 10 | 0 | 66° – 78° |
| August | 80° | 60° | 4.3" | 0.0" | 10 | 0 | 65° – 76° |
| September | 73° | 52° | 3.9" | 0.0" | 9 | 0 | 56° – 68° |
| October | 60° | 40° | 2.8" | 0.1" | 9 | 0 | 44° – 55° |
| November | 44° | 28° | 2.0" | 1.5" | 8 | 3 | 27° – 47° |
| December | 30° | 16° | 1.4" | 8.6" | 9 | 16 | 9° – 33° |
| Year | 56° | 37° | 37.4" | 34.8" | 118 | 73 |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from 7° to 31°. June is the most reliable, staying within 8°.
Where Jefferson Township’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 Jefferson Township’s center.
- Snow: Genoa Dam 8, WI.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Genoa Dam 8, WI, 5 miles from the town’s center, 190 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 Jefferson Township’s climate
What is the weather like in Jefferson Township?
A typical July afternoon reaches 82°, a January night drops to 9°, and about 35 inches of snow falls in a normal winter. Colder January nights than 94% of U.S. towns; cooler July afternoons than 81% of U.S. towns.
How cold does it get in Jefferson Township in winter?
January nights average 9°. About 138 nights a year reach 32° or below and 17 reach 0° or below. In the coldest January of the last 30 years the month averaged 7°.
How much snow does Jefferson Township get?
About 35 inches in a normal winter at Genoa Dam 8, WI, most of it in January, February and December, with snow on the ground about 73 days a year.
How hot does it get in Jefferson Township?
July, with a typical high of 82° and a low of 62°. About 9 days a year reach 90° (Genoa Dam 8, WI).
When is the first and last frost in Jefferson Township?
In half of years the last spring frost (32°) comes by April 22 and the first fall frost by October 17, about 178 frost-free days, at Genoa Dam 8, WI.
What growing zone is Jefferson Township in?
Zone 5a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −18°.
What is the best time of year to visit Jefferson Township?
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 Jefferson Township getting warmer?
Yes: 1991–2020 averaged 1.0° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 78% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Jefferson Township.
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.