Mahnomen, MN Climate: Temperature & Rain by Month
Annual temperature and rainfall from NOAA NCEI's 1991–2020 normals →; comfort score computed by PlainClimate
30-year climate normals (1991-2020) from Mahnomen's primary NOAA station, MAHNOMEN.
The climate verdict for Mahnomen
Winter sets the terms in Mahnomen, Minnesota. A pronounced 61.8°F seasonal swing and heating demand above twice the cooling total frame an annual average of 40°F. At 52/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 24% of scores.
- 40°F
- average temperature, NOAA 1991-2020 normal
- 52/100
- comfort score, above 24% of station-mapped location scores
- 26.4"
- precipitation, annual total
- 144 days
- frost-free growing season
Mahnomen: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00215012 · Mahnomen, MN 40°F mean · 26.4" precip
TEMP-COLD · RANK-COOL · PHOTO-FINISH · PRCP-MID · SWING-WIDE · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COLD 40°F
- RANK-COOL #343
- PHOTO-FINISH ≈ Thief Rvr Falls
- PRCP-MID 26.4"
- SWING-WIDE 62°F
- COMF-LOW 52/100
- LOAD-HEAT 9,470 HDD
- STN-1 USC00215012
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Thief Rvr Falls, MN (+ 0 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every MN station list.
- Mahnomen (this station) 40°F
- Cold Carrington, ND 40°F
- Hot Ada, MN 40°F
- Near Thief Rvr Falls, MN 40°F
- Near Cass Lake, MN 40°F
Mahnomen sits in Minnesota, the #3 coldest U.S. state at 42.2°F statewide annual average - see all 50 coldest states ranked by NOAA normals
Climate Living Index · Mahnomen
Mahnomen: 26/100 · grade F
Mahnomen publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Mahnomen, not an official NOAA rating. Rankings still use Comfort Score 52/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 26.4 in · 8.6 from 35 in | 70/100 · B |
| Normal heat + freeze calendar | 183 calendar days | 23/100 · F |
| Frost-free season | 144 days/year | 21/100 · F |
| Annual temperature balance | 39.9°F · 27.6° from 67.5°F | 4/100 · F |
Mahnomen · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Mahnomen is a continental Köppen climate: Dfb
Coldest-month mean 6.3°F and warmest-month mean 68.1°F place this station in continental, no dry season, warm summer climates (Dfb). Class Dfb is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, no dry season, warm summer.
- Köppen code
- Dfb
- Group
- Continental
- Warmest month
- 68.1°F
- Coldest month
- 6.3°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where Mahnomen sits across the climate record
Three NOAA fields for Mahnomen's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 95%
- Among 6,861 stations, Mahnomen sits in the cooler third of annual means.
- Annual precipitation
- 36th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Wider than 99%
- Warmest-to-coldest month gap for Mahnomen is large versus 6,861 complete station-years.
How Mahnomen compares across U.S. station-mapped locations
Mahnomen's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
52 24th percentile score exceeds 24% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). This entry sits in this band.
- 60–70: 1,236 station-mapped locations (20%). Above this entry.
- 70–80: 650 station-mapped locations (11%). Above this entry.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Mahnomen's measured station temperature trend
MethodologyAcross 40 complete annual observations from 1960 to 2025, MAHNOMEN warmed at a fitted rate of 0.29°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Mahnomen primary station fitted change +0.29 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 15°F (-9°C) | -2°F (-19°C) | 6°F (-14°C) | 0.8" | 30.9 | 0.0 |
| February | 21°F (-6°C) | 2°F (-17°C) | 11°F (-11°C) | 0.7" | 27.4 | 0.0 |
| March | 34°F (1°C) | 15°F (-9°C) | 25°F (-4°C) | 1.1" | 27.7 | 0.0 |
| April | 52°F (11°C) | 30°F (-1°C) | 41°F (5°C) | 1.7" | 19.3 | 0.0 |
| May | 66°F (19°C) | 43°F (6°C) | 55°F (13°C) | 3.1" | 4.3 | 0.3 |
| June | 74°F (23°C) | 54°F (12°C) | 64°F (18°C) | 4.7" | 0.0 | 1.3 |
| July | 79°F (26°C) | 58°F (14°C) | 68°F (20°C) | 3.8" | 0.0 | 1.7 |
| August | 78°F (26°C) | 55°F (13°C) | 67°F (19°C) | 3.4" | 0.0 | 1.8 |
| September | 69°F (21°C) | 47°F (8°C) | 58°F (14°C) | 2.8" | 2.7 | 0.2 |
| October | 54°F (12°C) | 34°F (1°C) | 44°F (7°C) | 2.3" | 13.9 | 0.0 |
| November | 34°F (1°C) | 20°F (-7°C) | 27°F (-3°C) | 1.0" | 28.1 | 0.0 |
| December | 22°F (-6°C) | 6°F (-15°C) | 14°F (-10°C) | 1.1" | 30.9 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 81°F around July 31, short of 90°F on every date, while 183 dates carry a normal low at or below freezing, the coldest -3°F near January 18.
The freezing stretch
The normal low stays at or below 32°F into April 20, then returns to freezing around October 21, covering 183 dates in all.
Derived from the normal daily minimum. This is a different measure from the 50%-probability frost dates shown elsewhere on this page, which come from NOAA’s frost product.
The widest day
August 14 carries the biggest normal gap between afternoon and dawn, 23°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Mahnomen.
Where Mahnomen Stands Nationally
Freezing is routine here by normals standards — the normal low reaches 32°F or colder on about 183 nights a year, more than most ranked stations.
Mahnomen earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall
Mahnomen runs a summer-peaked wet season
45% of Mahnomen's yearly precipitation falls in June, July and August alone, against the 25% an evenly spread year would give those three months. The wettest month is June at 4.7", on a wide 61.8°F gap between its warmest and coldest month. Warm-season convection and, across the Southwest, the North American monsoon produce this shape: rain arrives in short heavy bursts during the hottest part of the year rather than as long cool-season soaking.
- Wettest three months: June, July, August, taking 45% of the annual total between them.
- Driest month: February at 0.7".
- Winter share: 10% falls in December, January and February.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A summer-peaked label means the June-August share reaches 35%; it describes timing across an average year, not any single season, and says nothing about how heavy an individual storm can be.
Frost Dates & Growing Season
First Fall Freeze
September 28
50% probability date
Last Spring Freeze
May 7
50% probability date
Growing Season
144 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
9,470
Higher = more heating needed
Cooling Degree Days
362
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside MN closest to Mahnomen on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (40°F here).
- Sand Point, AK 40°F · 0.0°F off
- Towner, ND 40°F · 0.0°F off
- Carrington, ND 40°F · 0.1°F off
- Grand Forks, ND 40°F · 0.1°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (26.4" here), excluding temperature-peer places.
- McLean, TX 26.4" · 0.0" off
- Madison, SD 26.4" · 0.0" off
- Mangum, OK 26.4" · 0.0" off
- Howard, SD 26.4" · 0.1" off
Data-derived climate profile
How Mahnomen's climate pattern fits together
heating led · moderate · high swing
Winter and seasonal range jointly define this record. Mahnomen logs 9,470 heating degree days, more than twice its 362 cooling total, while the typical coldest-to-warmest-month gap reaches 61.8°F. The annual mean therefore compresses two materially different seasons.
Only about 144 days are frost-free in a normal year. That short interval is consistent with the cold-season signal, but the measure does not predict the exact first or last freeze in any one year.
Mahnomen's calendar has a pronounced split: July and January mark the typical warm and cold ends of the calendar, with 61.8°F between them. The annual average is 40°F. That average is context, while the monthly highs, lows, and precipitation totals describe the lived parts of the year.
Mahnomen's 26.4 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Snowfall is not added to the interpretation because its annual value is missing. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
These labels group NOAA 1991-2020 normals from Mahnomen's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for Mahnomen, not an official NOAA class or a year-ahead forecast.
Questions about Mahnomen's climate
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Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Mahnomen's primary station: MAHNOMEN (USC00215012). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The exact name-and-state crosswalk returns more than one Census place, so PlainClimate leaves the place identity unresolved. Because Mahnomen hits multiple Gazetteer rows, PlainClimate refuses to pick one and shows the unresolved badge instead of inventing a GEOID.
On this page every temperature, precipitation, and derived score for Mahnomen comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.