Annala Round Barn · Photo: Royalbroil · CC BY-SA 3.0Oma gets about 155 inches of snow a winter, more than all but 51 U.S. towns
Midsummer highs settle at about 77°. In July, afternoons here are cooler than in 97% of U.S. towns. December has warmed most since 1901–2000, part of a 1.4° rise. Seedlings are safe outdoors from about May 24, with the first autumn frost due around September 28.
A year in Oma at a glance
Each month’s typical high and low, and what it brings.
What stands out about Oma’s climate
Compared with towns across the U.S., with Oma’s place in Wisconsin beside it.
What a year in Oma feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 128 frost-free days a year
In half of years the last 32° night comes by May 24 and the first by September 28. Frost and day counts come from NOAA’s station at Hurley, WI, 13 miles from the town’s center, 210 ft lower.
The 2023 USDA map puts Oma’s center in zone 4a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −28°. 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 155 inches of snow a winter
Snow, measured at Hurley, WI, falls mostly in January. Precipitation (rain plus melted snow) adds up to 35 inches a year; June is the wettest month and February the driest. Rain or snow falls on about 136 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Oma
97% 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 Hurley, WI.
Living with Oma’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
128 frost-free days in zone 4a. The last frost comes by May 24 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Sep 28.
Months with highs of 62–84° and lows of 40° or more: June, July, August and September. 27 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Oma from natural hazards, river flooding is the largest share (53%); heat waves, cold waves, winter storms and ice storms together are 37%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Oma and its neighbors
Every town next door is within a degree of Oma in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Oma’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 |
|---|---|---|---|---|
| Oma, WI | 2° | 77° | 35" | 155" |
| Caribou, ME | 2° | 77° | 41" | 118" |
| Lyndon, VT | 5° | 79° | 41" | 142" |
| Sault Ste. Marie, MI | 8° | 76° | 37" | 120" |
| Wilna, NY | 8° | 79° | 42" | 127" |
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 Oma averaged 1.4° warmer than the 1900s. The biggest change is in December (+3.5°).
A bigger shift than in 54% 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 Oma compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Oma’s place among Wisconsin’s.
Oma weather by month
Highs, lows and precipitation from NOAA’s grid at Oma’s center; snow, wet days and snow on the ground from Hurley, WI. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 20° | 2° | 1.6" | 38.8" | 14 | 31 | −1° – 23° |
| February | 25° | 3° | 1.3" | 26.2" | 10 | 29 | 3° – 29° |
| March | 36° | 13° | 1.8" | 18.2" | 9 | 26 | 14° – 40° |
| April | 49° | 26° | 3.0" | 9.4" | 10 | 10 | 28° – 45° |
| May | 64° | 39° | 3.8" | 1.4" | 11 | 1 | 45° – 57° |
| June | 73° | 49° | 4.2" | 0.0" | 11 | 0 | 57° – 66° |
| July | 77° | 53° | 4.2" | 0.0" | 11 | 0 | 58° – 69° |
| August | 75° | 51° | 3.7" | 0.0" | 10 | 0 | 57° – 67° |
| September | 67° | 44° | 3.8" | 0.2" | 12 | 0 | 49° – 61° |
| October | 52° | 33° | 3.6" | 4.6" | 13 | 2 | 36° – 48° |
| November | 37° | 22° | 2.3" | 21.5" | 12 | 16 | 19° – 40° |
| December | 25° | 10° | 1.8" | 34.7" | 13 | 29 | 6° – 27° |
| Year | 50° | 29° | 35.1" | 155.0" | 136 | 143 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 3° to 29°. June is the most reliable, staying within 9°.
Where Oma’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 Oma’s center.
- Snow: Hurley, WI.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Hurley, WI, 13 miles from the town’s center, 210 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 Oma’s climate
What is the weather like in Oma?
A typical July afternoon reaches 77°, a January night drops to 2°, and about 155 inches of snow falls in a normal winter. Colder January nights than all but 85 U.S. towns; cooler July afternoons than 97% of U.S. towns.
How cold does it get in Oma in winter?
January nights average 2°. About 185 nights a year reach 32° or below and 38 reach 0° or below. In the coldest January of the last 30 years the month averaged −1°.
How much snow does Oma get?
About 155 inches in a normal winter at Hurley, WI, most of it in January, with snow on the ground about 143 days a year.
How hot does it get in Oma?
July, with a typical high of 77° and a low of 53°. About 3 days a year reach 90° (Hurley, WI).
When is the first and last frost in Oma?
In half of years the last spring frost (32°) comes by May 24 and the first fall frost by September 28, about 128 frost-free days, at Hurley, WI.
What growing zone is Oma in?
Zone 4a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −28°.
What is the best time of year to visit Oma?
By one simple rule (highs of 62–84° and lows of 40° or more), June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Oma getting warmer?
Yes: 1991–2020 averaged 1.4° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 54% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Oma.
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.