Cass Lake, MN Climate: Temperature & Rain by Month
Temperature and precipitation from NOAA NCEI 1991–2020 normals →, plus PlainClimate's derived comfort score
30-year climate normals (1991-2020) from Cass Lake's primary NOAA station, CASS LAKE.
The climate verdict for Cass Lake
Winter sets the terms in Cass Lake, Minnesota. A pronounced 61.4°F seasonal swing and heating demand above twice the cooling total frame an annual average of 40°F. At 49/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 18% of scores.
- 40°F
- annual average temperature (NOAA normal)
- 49/100
- comfort score, above 18% of station-mapped location scores
- 26.5"
- annual precipitation · 49" snow
- 132 days
- frost-free days per growing season
Cass Lake: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00211374 · Cass Lake, MN 40°F mean · 26.5" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-MID · SWING-WIDE · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 40°F
- RANK-COOL #343
- PHOTO-FINISH ≈ Thief Rvr Falls
- PRCP-MID 26.5"
- SWING-WIDE 61°F
- COMF-LOW 49/100
- LOAD-HEAT 9,456 HDD
- STN-1 USC00211374
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Thief Rvr Falls, MN ( -0.1 °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.
- Cass Lake (this station) 40°F
- Cold Carrington, ND 40°F
- Hot Crookston NW, MN 40°F
- Near Thief Rvr Falls, MN 40°F
- Near Mahnomen, MN 40°F
Cass Lake 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 · Cass Lake
Cass Lake: 24/100 · grade F
Cass Lake publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Cass Lake, not an official NOAA rating. Rankings still use Comfort Score 49/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 26.5 in · 8.5 from 35 in | 70/100 · B |
| Normal heat + freeze calendar | 186 calendar days | 22/100 · F |
| Snowfall burden | 48.9 inches/year | 22/100 · F |
| Frost-free season | 132 days/year | 13/100 · F |
| Annual temperature balance | 40.0°F · 27.5° from 67.5°F | 5/100 · F |
Cass Lake · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Cass Lake is a continental Köppen climate: Dfb
Coldest-month mean 7.1°F and warmest-month mean 68.5°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
- 68.5°F
- Coldest month
- 7.1°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 Cass Lake sits across the climate record
Three NOAA fields for Cass Lake'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, Cass Lake 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 Cass Lake is large versus 6,861 complete station-years.
How Cass Lake compares across U.S. station-mapped locations
Cass Lake's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
49 18th percentile score exceeds 18% 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%). This entry sits in this band.
- 50–60: 1,329 station-mapped locations (21%). Above this entry.
- 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
Cass Lake's measured station temperature trend
MethodologyAcross 55 complete annual observations from 1958 to 2025, CASS LAKE warmed at a fitted rate of 0.31°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Cass Lake primary station fitted change +0.31 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 18°F (-8°C) | -4°F (-20°C) | 7°F (-14°C) | 0.8" | 9.1" | 30.9 | 0.0 |
| February | 24°F (-5°C) | 0°F (-18°C) | 12°F (-11°C) | 0.7" | 9.3" | 27.7 | 0.0 |
| March | 37°F (3°C) | 15°F (-10°C) | 26°F (-3°C) | 1.2" | 6.2" | 28.6 | 0.0 |
| April | 51°F (11°C) | 29°F (-2°C) | 40°F (4°C) | 2.0" | 5.6" | 19.8 | 0.0 |
| May | 65°F (18°C) | 42°F (6°C) | 54°F (12°C) | 2.9" | 0.0" | 5.0 | 0.2 |
| June | 75°F (24°C) | 53°F (12°C) | 64°F (18°C) | 4.1" | 0.0" | 0.2 | 0.6 |
| July | 79°F (26°C) | 58°F (14°C) | 69°F (20°C) | 3.7" | 0.0" | 0.0 | 1.8 |
| August | 77°F (25°C) | 56°F (13°C) | 67°F (19°C) | 3.1" | 0.0" | 0.0 | 1.2 |
| September | 68°F (20°C) | 47°F (8°C) | 57°F (14°C) | 2.9" | 0.0" | 2.6 | 0.2 |
| October | 52°F (11°C) | 34°F (1°C) | 43°F (6°C) | 2.8" | 1.4" | 14.9 | 0.0 |
| November | 36°F (2°C) | 20°F (-7°C) | 28°F (-2°C) | 1.3" | 5.8" | 26.6 | 0.0 |
| December | 23°F (-5°C) | 6°F (-15°C) | 14°F (-10°C) | 1.0" | 11.5" | 30.9 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 80°F around July 20, short of 90°F on every date, while 186 dates carry a normal low at or below freezing, the coldest -5°F near January 25.
The freezing stretch
The normal low stays at or below 32°F into April 22, then returns to freezing around October 20, covering 186 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.
Where the wet dates fall
The likeliest wet date is June 17, when 42% of years recorded at least a hundredth of an inch. The driest is March 17 at 23%. Summed across the calendar, that is about 112 wet dates a year.
The widest day
February 10 carries the biggest normal gap between afternoon and dawn, 24°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Cass Lake.
Where Cass Lake Stands Nationally
Freezing is routine here by normals standards — the normal low reaches 32°F or colder on about 186 nights a year, more than most ranked stations.
Cass Lake 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 and snowfall
Snow: 9.1"
7.9 days with precipitation
Snow: 9.3"
6.8 days with precipitation
Snow: 6.2"
7.3 days with precipitation
Snow: 5.6"
8.5 days with precipitation
11.7 days with precipitation
12.7 days with precipitation
10.8 days with precipitation
9.3 days with precipitation
10.4 days with precipitation
Snow: 1.4"
10.3 days with precipitation
Snow: 5.8"
7.1 days with precipitation
Snow: 11.5"
8.5 days with precipitation
Cass Lake runs a summer-peaked wet season
41% of Cass Lake'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 4.1", on a wide 61.4°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 41% of the annual total between them.
- Driest month: February at 0.7".
- Winter share: 9% 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.
How Cass Lake's precipitation splits across the calendar
About 111 days a year record measurable precipitation here, carrying 26.5" between them, or roughly 0.24 inches on a typical wet day. That sits in the middle band: neither the many-light-days pattern of the Pacific Northwest and the Great Lakes, nor the few-heavy-events pattern of the Gulf and the desert Southwest.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year and say nothing about the heaviest single storm on record.
Winter brings real snow to Cass Lake
Cass Lake averages 48.9 inches of snowfall a year, with December the snowiest month on the normals, spread across roughly 35 days that record measurable snow. That is depth accumulating on the ground, which is why it can exceed the annual precipitation figure: precipitation counts the liquid the snow melts down to, and fresh snow is mostly air.
- Annual snowfall: 48.9 inches of depth.
- Days recording measurable snow: about 35 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 18% of the year's precipitation.
NOAA 1991-2020 normals. The ten-to-one ratio is a convention, not a measurement: real ratios vary with temperature, so treat the share as an order of magnitude rather than an exact split.
Frost Dates & Growing Season
First Fall Freeze
September 26
50% probability date
Last Spring Freeze
May 17
50% probability date
Growing Season
132 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
9,456
Higher = more heating needed
Cooling Degree Days
375
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside MN closest to Cass Lake 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).
- Rhinelander, WI 40°F · 0.0°F off
- Yakutat, AK 40°F · 0.0°F off
- Gustavus, AK 40°F · 0.1°F off
- Homer, AK 40°F · 0.1°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (26.5" here), excluding temperature-peer places.
- Ravenna, NE 26.5" · 0.0" off
- Loup City, NE 26.5" · 0.0" off
- Eden, TX 26.5" · 0.0" off
- Talkeetna, AK 26.5" · 0.0" off
Snow and freeze rhythm
When cold and snow define Cass Lake
heating led · moderate · high swing
Winter and seasonal range jointly define this record. Cass Lake logs 9,456 heating degree days, more than twice its 375 cooling total, while the typical coldest-to-warmest-month gap reaches 61.4°F. The annual mean therefore compresses two materially different seasons.
Only about 132 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.
-
1. Cass Lake coldest normal
January
Averaging 7°F (-14°C), this month sits below freezing for the month as a whole, not merely overnight.
-
2. Cass Lake typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Cass Lake snow peak
December
Cass Lake averages 48.9 inches of snow a year, with December the snowiest month on the normals.
Questions about Cass Lake's climate
How much snow does Cass Lake get? ▼
How cold does Cass Lake get in winter? ▼
How much energy does heating and cooling require in Cass Lake? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Cass Lake's primary station: CASS LAKE (USC00211374). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as an incorporated place (GEOID 2710252). Match rule for Cass Lake: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Cass Lake 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.