Photo: TCP04 · CC BY 4.0Summers in Oostburg are cooler than in 95% of U.S. towns
Midwinter brings lows of about 15°. In January, nights here are colder than in 84% of U.S. towns. Since 1901–2000, the year has warmed by 1.4°, most of all in December. Tender plants can go out after about May 3; in half of years the first frost comes by October 16.
A year in Oostburg at a glance
Each month’s typical high and low, and what it brings.
What stands out about Oostburg’s climate
Compared with towns across the U.S., with Oostburg’s place in Wisconsin beside it.
What a year in Oostburg feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 165 frost-free days a year
In half of years the last 32° night comes by May 3 and the first by October 16. Frost and day counts come from NOAA’s station at Hingham Wwtp, WI, 6 miles from the town’s center, at about the same height.
The 2023 USDA map puts Oostburg’s center in zone 5b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −11°. 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 49 inches of snow a winter
Snow, measured at Hingham Wwtp, WI, falls mostly in February and 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 125 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Oostburg
94% 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 Hingham Wwtp, WI.
Living with Oostburg’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
165 frost-free days in zone 5b. The last frost comes by May 3 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 16.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 0.3 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Oostburg from natural hazards, river flooding is the largest share (46%); heat waves, cold waves, winter storms and ice storms together are 25%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Oostburg and its neighbors
Lima has the coldest January nights next door (13°, 3° colder) and Lima the hottest July afternoons (81°, 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 Oostburg’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 |
|---|---|---|---|---|
| Oostburg, WI | 15° | 79° | 32" | 49" |
| Alpena, MI | 14° | 78° | 31" | 59" |
| Le Roy, NY | 17° | 80° | 35" | 52" |
| Colchester, VT | 10° | 81° | 38" | 50" |
| Lakeville, MN | 7° | 82° | 33" | 41" |
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 Oostburg averaged 1.4° warmer than the 1900s. The biggest change is in December (+3.2°).
A bigger shift than in 55% 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 Oostburg compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Oostburg’s place among Wisconsin’s.
Oostburg weather by month
Highs, lows and precipitation from NOAA’s grid at Oostburg’s center; snow, wet days and snow on the ground from Hingham Wwtp, WI. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 29° | 15° | 1.6" | 11.2" | 9 | 23 | 11° – 33° |
| February | 31° | 18° | 1.3" | 14.2" | 9 | 24 | 13° – 34° |
| March | 41° | 26° | 1.9" | 6.6" | 9 | 13 | 26° – 47° |
| April | 51° | 35° | 3.5" | 2.2" | 11 | 2 | 35° – 48° |
| May | 62° | 45° | 3.6" | 0.0" | 13 | 0 | 48° – 59° |
| June | 73° | 55° | 3.9" | 0.0" | 12 | 0 | 60° – 69° |
| July | 79° | 62° | 3.4" | 0.0" | 10 | 0 | 65° – 77° |
| August | 78° | 61° | 3.4" | 0.0" | 11 | 0 | 65° – 75° |
| September | 71° | 54° | 2.7" | 0.0" | 10 | 0 | 56° – 67° |
| October | 58° | 42° | 2.8" | 0.0" | 12 | 0 | 46° – 56° |
| November | 45° | 31° | 2.1" | 1.4" | 8 | 2 | 29° – 46° |
| December | 34° | 21° | 1.8" | 13.0" | 10 | 15 | 16° – 38° |
| Year | 54° | 39° | 32.1" | 48.6" | 125 | 79 |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from 11° to 33°. June is the most reliable, staying within 9°.
Where Oostburg’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 Oostburg’s center.
- Snow: Hingham Wwtp, WI.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Hingham Wwtp, 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 Oostburg’s climate
What is the weather like in Oostburg?
A typical July afternoon reaches 79°, a January night drops to 15°, and about 49 inches of snow falls in a normal winter. Colder January nights than 84% of U.S. towns; cooler July afternoons than 95% of U.S. towns.
How cold does it get in Oostburg in winter?
January nights average 15°. About 148 nights a year reach 32° or below and 13 reach 0° or below. In the coldest January of the last 30 years the month averaged 11°.
How much snow does Oostburg get?
About 49 inches in a normal winter at Hingham Wwtp, WI, most of it in February and December, with snow on the ground about 79 days a year.
How hot does it get in Oostburg?
July, with a typical high of 79° and a low of 62°. About 6 days a year reach 90° (Hingham Wwtp, WI).
When is the first and last frost in Oostburg?
In half of years the last spring frost (32°) comes by May 3 and the first fall frost by October 16, about 165 frost-free days, at Hingham Wwtp, WI.
What growing zone is Oostburg in?
Zone 5b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −11°.
What is the best time of year to visit Oostburg?
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 Oostburg getting warmer?
Yes: 1991–2020 averaged 1.4° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 55% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Oostburg.
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.