Swan Lake, MT Climate: Temperature by Month
Explore NOAA NCEI's 1991–2020 climate normals → and a clearly labeled PlainClimate comfort calculation
30-year climate normals (1991-2020) from Swan Lake's primary NOAA station, SWAN LAKE.
The climate verdict for Swan Lake
Swan Lake, Montana has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 44°F. July is the warmest month at 65°F and January the coldest at 24°F.
- 44°F
- average temperature, NOAA 1991-2020 normal
- 125 days
- frost-free growing season
Swan Lake: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00248087 · Swan Lake, MT 44°F mean
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-UNK · SWING-MID · COMF-UNK · LOAD-HEAT · STN-1 · BOOK-PART
- TEMP-COOL 44°F
- RANK-COOL #892
- PHOTO-FINISH ≈ Moorman Rch - R…
- PRCP-UNK Rain n/a
- SWING-MID 40°F
- COMF-UNK Comfort n/a
- LOAD-HEAT 7,953 HDD
- STN-1 USC00248087
- BOOK-PART 4/6 fields
Nearest mean-temperature peer: Moorman Rch - Ruth, NV (+ 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 MT station list.
- Swan Lake (this station) 44°F
- Hot Virginia Dale, CO 44°F
- Near Moorman Rch - R…, NV 44°F
- Near Rowe, MA 44°F
- Near E Jewett, NY 44°F
Swan Lake sits in Montana, the #6 coldest U.S. state at 43.4°F statewide annual average - see all 50 coldest states ranked by NOAA normals
Climate Living Index · Swan Lake
Swan Lake: 15/100 · grade F
Swan Lake publishes 3 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 3 missing weights rescale to 100.
PlainClimate-derived for Swan Lake, not an official NOAA rating. Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 190 calendar days | 19/100 · F |
| Annual temperature balance | 43.5°F · 24.0° from 67.5°F | 14/100 · F |
| Frost-free season | 125 days/year | 9/100 · F |
Swan Lake · 2026-08-04 · NOAA NCEI Climate Normals · method .
National standing · heating-led station
Where Swan Lake sits across the climate record
Available NOAA 1991–2020 fields for Swan Lake are ranked only against stations that publish the same field, missing metrics stay blank rather than estimated.
- Annual temperature
- Cooler than 87%
- Among 6,861 stations, Swan Lake sits in the cooler third of annual means.
- Seasonal temperature swing
- 37th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 31°F (-1°C) | 18°F (-8°C) | 24°F (-4°C) | N/A | 30.4 | 0.0 |
| February | 36°F (2°C) | 18°F (-8°C) | 27°F (-3°C) | N/A | 27.9 | 0.0 |
| March | 45°F (7°C) | 26°F (-4°C) | 35°F (2°C) | N/A | 29.3 | 0.0 |
| April | 54°F (12°C) | 31°F (0°C) | 43°F (6°C) | N/A | 21.5 | 0.0 |
| May | 64°F (18°C) | 38°F (3°C) | 51°F (11°C) | N/A | 8.9 | 0.2 |
| June | 71°F (22°C) | 44°F (7°C) | 58°F (14°C) | N/A | 0.9 | 0.8 |
| July | 82°F (28°C) | 48°F (9°C) | 65°F (18°C) | N/A | 0.1 | 6.2 |
| August | 82°F (28°C) | 46°F (8°C) | 64°F (18°C) | N/A | 0.9 | 7.3 |
| September | 70°F (21°C) | 39°F (4°C) | 55°F (13°C) | N/A | 6.1 | 1.3 |
| October | 55°F (13°C) | 32°F (0°C) | 43°F (6°C) | N/A | 20.2 | 0.0 |
| November | 39°F (4°C) | 26°F (-4°C) | 32°F (0°C) | N/A | 27.0 | 0.0 |
| December | 30°F (-1°C) | 20°F (-7°C) | 25°F (-4°C) | N/A | 30.3 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 85°F around July 30, short of 90°F on every date, while 190 dates carry a normal low at or below freezing, the coldest 17°F near February 6.
The freezing stretch
The normal low stays at or below 32°F into April 23, then returns to freezing around October 17, covering 190 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 5 carries the biggest normal gap between afternoon and dawn, 37°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Swan Lake.
Where Swan Lake Stands Nationally
Day-to-night contrast is extreme by national standards — the widest normal daily swing reaches about 37°F, sharper than nine in ten ranked stations see.
Freezing is routine here by normals standards — the normal low reaches 32°F or colder on about 190 nights a year, more than most ranked stations.
Swan Lake earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall
Frost Dates & Growing Season
First Fall Freeze
September 19
50% probability date
Last Spring Freeze
May 17
50% probability date
Growing Season
125 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
7,953
Higher = more heating needed
Cooling Degree Days
142
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside MT closest to Swan 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 (44°F here).
- Alpena, MI 44°F · 0.0°F off
- Amery, WI 44°F · 0.0°F off
- Blanca, CO 44°F · 0.0°F off
- Cross Village, MI 44°F · 0.0°F off
Data-derived climate profile
How Swan Lake's climate pattern fits together
heating led · mid swing
Swan Lake's energy balance leans toward cold weather: 7,953 annual heating degree days against 142 for cooling. Its 40.4°F seasonal range still makes the monthly rows more useful than the annual average alone.
Only about 125 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.
July and January mark the typical warm and cold ends of the calendar in Swan Lake's middle-range seasonal profile. The measured spread is 40.4°F. The annual average is 44°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
A moisture-range label is withheld because Swan Lake's annual precipitation total is unavailable. Monthly source values remain visible where NOAA provides them, and no annual amount is reconstructed from incomplete data.
These labels group NOAA 1991-2020 normals from Swan Lake'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 Swan Lake, not an official NOAA class or a year-ahead forecast.
Questions about Swan Lake's climate
How cold does Swan Lake get in winter? ▼
How much energy does heating and cooling require in Swan Lake? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Swan Lake's primary station: SWAN LAKE (USC00248087). 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 a census-designated place (GEOID 3072850), not an incorporated municipality. Match rule for Swan 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 Swan 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.