Photo: TCP04 · CC BY 4.0Oconto has some of the coolest summers among U.S. towns
The coldest hours of a January night bottom out at 12° on average. The gap between a January night and a July afternoon is 66°. By January nights alone, it runs colder than 91% of U.S. towns. Radiators earn their keep from October to April, the months that average under 50°.
A year in Oconto at a glance
Each month’s typical high and low, and what it brings.
What stands out about Oconto’s climate
Compared with towns across the U.S., with Oconto’s place in Wisconsin beside it.
What a year in Oconto feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 150 frost-free days a year
In half of years the last 32° night comes by May 9 and the first by October 6. Frost and day counts come from NOAA’s station at Oconto 4 W, WI, 4 miles from the town’s center, at about the same height.
The 2023 USDA map puts Oconto’s center in zone 5a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −15°. 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 52 inches of snow a winter
Snow, measured at Oconto 4 W, WI, falls mostly in December. Precipitation (rain plus melted snow) adds up to 32 inches a year; June is the wettest month and February the driest. Rain or snow falls on about 101 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Oconto
95% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through May.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Oconto 4 W, WI.
Living with Oconto’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
150 frost-free days in zone 5a. The last frost comes by May 9 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. 4.1 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Oconto from natural hazards, river flooding is the largest share (73%); heat waves, cold waves, winter storms and ice storms together are 18%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Oconto and its neighbors
Little River has the coldest January nights next door (10°, 2° colder) and Oconto the hottest July afternoons (80°, 2° 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 Oconto’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 |
|---|---|---|---|---|
| Oconto, WI | 12° | 78° | 32" | 52" |
| Alpena, MI | 14° | 78° | 31" | 59" |
| Plattsburgh, NY | 9° | 80° | 34" | 50" |
| Duluth, MN | 5° | 76° | 30" | 56" |
| Milton, VT | 10° | 80° | 40" | 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 Oconto averaged 1.6° warmer than the 1900s. The biggest change is in February (+3.0°).
A bigger shift than in 67% 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 Oconto compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Oconto’s place among Wisconsin’s.
Oconto weather by month
Highs, lows and precipitation from NOAA’s grid at Oconto’s center; snow, wet days and snow on the ground from Oconto 4 W, WI. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 26° | 12° | 1.5" | 10.5" | 8 | 27 | 8° – 30° |
| February | 29° | 14° | 1.2" | 11.1" | 6 | 25 | 10° – 33° |
| March | 39° | 23° | 1.8" | 7.9" | 7 | 15 | 20° – 45° |
| April | 50° | 33° | 3.0" | 4.9" | 10 | 3 | 33° – 48° |
| May | 63° | 43° | 3.3" | 0.1" | 10 | 0 | 46° – 59° |
| June | 73° | 54° | 4.0" | 0.0" | 10 | 0 | 60° – 68° |
| July | 78° | 59° | 3.8" | 0.0" | 11 | 0 | 62° – 73° |
| August | 77° | 59° | 3.3" | 0.0" | 9 | 0 | 63° – 71° |
| September | 69° | 51° | 3.5" | 0.0" | 9 | 0 | 54° – 65° |
| October | 56° | 40° | 3.1" | 0.2" | 9 | 0 | 43° – 54° |
| November | 43° | 30° | 2.1" | 2.3" | 7 | 3 | 28° – 44° |
| December | 31° | 19° | 1.8" | 14.5" | 8 | 19 | 14° – 35° |
| Year | 53° | 36° | 32.3" | 51.5" | 101 | 92 |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 20° to 45°. June is the most reliable, staying within 8°.
Where Oconto’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 Oconto’s center.
- Snow: Oconto 4 W, WI.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Oconto 4 W, WI, 4 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 Oconto’s climate
What is the weather like in Oconto?
A typical July afternoon reaches 78°, a January night drops to 12°, and about 52 inches of snow falls in a normal winter. Colder January nights than 91% of U.S. towns; cooler July afternoons than 96% of U.S. towns.
How cold does it get in Oconto in winter?
January nights average 12°. About 169 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 8°.
How much snow does Oconto get?
About 52 inches in a normal winter at Oconto 4 W, WI, most of it in December, with snow on the ground about 92 days a year.
How hot does it get in Oconto?
July, with a typical high of 78° and a low of 59°. About 4 days a year reach 90° (Oconto 4 W, WI).
When is the first and last frost in Oconto?
In half of years the last spring frost (32°) comes by May 9 and the first fall frost by October 6, about 150 frost-free days, at Oconto 4 W, WI.
What growing zone is Oconto in?
Zone 5a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −15°.
What is the best time of year to visit Oconto?
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 Oconto getting warmer?
Yes: 1991–2020 averaged 1.6° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 67% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Oconto.
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.