Midwinter lows in Eureka sink below those of 94% of U.S. towns
In July the day’s top temperature is typically 82°. Summers stay cool: July afternoons here are cooler than in 83% of U.S. towns. Decade by decade the climate has edged up, 1.5° above 1901–2000. Warm coats and heating bills mark the months from October to April, when means dip under 50°.
A year in Eureka at a glance
Each month’s typical high and low, and what it brings.
What stands out about Eureka’s climate
Compared with towns across the U.S., with Eureka’s place in Wisconsin beside it.
What a year in Eureka feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 158 frost-free days a year
In half of years the last 32° night comes by May 1 and the first by October 8. Frost and day counts come from NOAA’s station at Berlin Wwtp, WI, 5 miles from the town’s center, at about the same height.
The 2023 USDA map puts Eureka’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 39 inches of snow a winter
Snow, measured at Oshkosh, 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 119 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Eureka
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 Berlin Wwtp, WI.
Living with Eureka’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
158 frost-free days in zone 5a. The last frost comes by May 1 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 8.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September.
Parks & trails →Of the yearly building losses FEMA expects in Eureka from natural hazards, river flooding is the largest share (62%); heat waves, cold waves, winter storms and ice storms together are 15%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Eureka and similar climates
TownRatings has no climate map of the towns around Eureka yet.
Climates most like Eureka’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 |
|---|---|---|---|---|
| Eureka, WI | 10° | 82° | 33" | 39" |
| West St. Paul, MN | 7° | 82° | 33" | 40" |
| Estherville, IA | 7° | 82° | 31" | 38" |
| Plattsburgh, NY | 9° | 81° | 35" | 50" |
| Colchester, VT | 10° | 81° | 38" | 50" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Eureka averaged 1.5° warmer than the 1900s. The biggest change is in December (+3.2°).
A bigger shift than in 60% 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 Eureka compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Eureka’s place among Wisconsin’s.
Eureka weather by month
Highs, lows and precipitation from NOAA’s grid at Eureka’s center; snow, wet days and snow on the ground from Oshkosh, WI. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 26° | 10° | 1.3" | 9.8" | 9 | 23 | 7° – 30° |
| February | 30° | 13° | 1.1" | 10.1" | 8 | 24 | 10° – 32° |
| March | 42° | 23° | 1.9" | 5.4" | 9 | 12 | 24° – 47° |
| April | 56° | 34° | 3.2" | 1.8" | 11 | 1 | 36° – 51° |
| May | 68° | 46° | 4.0" | 0.0" | 12 | 0 | 50° – 64° |
| June | 78° | 56° | 4.8" | 0.0" | 11 | 0 | 63° – 71° |
| July | 82° | 60° | 3.8" | 0.0" | 10 | 0 | 65° – 77° |
| August | 80° | 58° | 3.5" | 0.0" | 10 | 0 | 64° – 73° |
| September | 72° | 50° | 3.3" | 0.0" | 9 | 0 | 55° – 66° |
| October | 59° | 38° | 2.8" | 0.3" | 10 | 0 | 44° – 55° |
| November | 44° | 27° | 2.0" | 1.8" | 9 | 2 | 27° – 44° |
| December | 31° | 16° | 1.5" | 10.0" | 9 | 14 | 11° – 34° |
| Year | 56° | 36° | 32.9" | 39.2" | 119 | 77 |
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 30°. June is the most reliable, staying within 9°.
Where Eureka’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 Eureka’s center.
- Snow: Oshkosh, WI.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Berlin Wwtp, WI, 5 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 Eureka’s climate
What is the weather like in Eureka?
A typical July afternoon reaches 82°, a January night drops to 10°, and about 39 inches of snow falls in a normal winter. Colder January nights than 94% of U.S. towns; cooler July afternoons than 83% of U.S. towns.
How cold does it get in Eureka in winter?
January nights average 10°. About 161 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 Eureka get?
About 39 inches in a normal winter at Oshkosh, WI, most of it in January, February and December, with snow on the ground about 77 days a year.
How hot does it get in Eureka?
July, with a typical high of 82° and a low of 60°. About 8 days a year reach 90° (Berlin Wwtp, WI).
When is the first and last frost in Eureka?
In half of years the last spring frost (32°) comes by May 1 and the first fall frost by October 8, about 158 frost-free days, at Berlin Wwtp, WI.
What growing zone is Eureka 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 Eureka?
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 Eureka getting warmer?
Yes: 1991–2020 averaged 1.5° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 60% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Eureka.
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.