Photo: Andrew Filer · CC BY-SA 2.0Flensburg sits near the bottom of U.S. towns for winter warmth
July afternoons average 81°. Summers stay cool: July afternoons here are cooler than in 88% of U.S. towns. Decade by decade the climate has edged up, 1.8° above 1901–2000. Tender plants can go out after about May 4; in half of years the first frost comes by October 5.
A year in Flensburg at a glance
Each month’s typical high and low, and what it brings.
What stands out about Flensburg’s climate
Compared with towns across the U.S., with Flensburg’s place in Minnesota beside it.
What a year in Flensburg feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 151 frost-free days a year
In half of years the last 32° night comes by May 4 and the first by October 5. Frost and day counts come from NOAA’s station at Little Falls 2nne, MN, 10 miles from the town’s center, at about the same height.
The 2023 USDA map puts Flensburg’s center in zone 4a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −26°. 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 51 inches of snow a winter
Snow, measured at Royalton 5w, MN, falls mostly in January. Precipitation (rain plus melted snow) adds up to 29 inches a year; June is the wettest month and January the driest. Rain or snow falls on about 93 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Flensburg
92% 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 Little Falls 2nne, MN.
Living with Flensburg’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
151 frost-free days in zone 4a. The last frost comes by May 4 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 5.
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 Flensburg from natural hazards, river flooding is the largest share (74%); heat waves, cold waves, winter storms and ice storms together are 6%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Flensburg and its neighbors
Every town next door is within a degree of Flensburg in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Flensburg’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 |
|---|---|---|---|---|
| Flensburg, MN | 2° | 81° | 29" | 51" |
| Kingsford, MI | 5° | 80° | 29" | 61" |
| Chippewa Falls, WI | 5° | 81° | 33" | 55" |
| Brookings, SD | 5° | 82° | 27" | 36" |
| Grand Forks, ND | −2° | 81° | 22" | 49" |
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 Flensburg averaged 1.8° warmer than the 1900s. The biggest change is in December (+3.7°).
A bigger shift than in 77% 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 Flensburg compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Flensburg’s place among Minnesota’s.
Flensburg weather by month
Highs, lows and precipitation from NOAA’s grid at Flensburg’s center; snow, wet days and snow on the ground from Royalton 5w, MN. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 20° | 2° | 0.7" | 11.2" | 6 | −2° – 25° |
| February | 26° | 6° | 0.7" | 8.5" | 6 | 5° – 29° |
| March | 39° | 19° | 1.4" | 8.5" | 6 | 20° – 43° |
| April | 53° | 32° | 2.4" | 5.0" | 9 | 33° – 52° |
| May | 67° | 45° | 3.4" | 0.0" | 10 | 51° – 62° |
| June | 77° | 55° | 4.4" | 0.0" | 12 | 62° – 69° |
| July | 81° | 60° | 4.3" | 0.0" | 11 | 63° – 76° |
| August | 79° | 57° | 3.6" | 0.0" | 7 | 62° – 72° |
| September | 70° | 49° | 3.0" | 0.0" | 7 | 52° – 65° |
| October | 56° | 36° | 2.7" | 1.1" | 7 | 38° – 51° |
| November | 39° | 23° | 1.3" | 9.0" | 6 | 22° – 41° |
| December | 25° | 10° | 0.9" | 7.4" | 6 | 3° – 26° |
| Year | 52° | 33° | 28.7" | 50.7" | 93 |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from -2° to 25°. June is the most reliable, staying within 8°.
Where Flensburg’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 Flensburg’s center.
- Snow: Royalton 5w, MN.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Little Falls 2nne, MN, 10 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 Flensburg’s climate
What is the weather like in Flensburg?
A typical July afternoon reaches 81°, a January night drops to 2°, and about 51 inches of snow falls in a normal winter. Colder January nights than all but 80 U.S. towns; cooler July afternoons than 88% of U.S. towns.
How cold does it get in Flensburg in winter?
January nights average 2°. About 167 nights a year reach 32° or below and 35 reach 0° or below. In the coldest January of the last 30 years the month averaged −2°.
How much snow does Flensburg get?
About 51 inches in a normal winter at Royalton 5w, MN, most of it in January.
How hot does it get in Flensburg?
July, with a typical high of 81° and a low of 60°. About 14 days a year reach 90° (Little Falls 2nne, MN).
When is the first and last frost in Flensburg?
In half of years the last spring frost (32°) comes by May 4 and the first fall frost by October 5, about 151 frost-free days, at Little Falls 2nne, MN.
What growing zone is Flensburg in?
Zone 4a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −26°.
What is the best time of year to visit Flensburg?
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 Flensburg getting warmer?
Yes: 1991–2020 averaged 1.8° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 77% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Flensburg.
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.