Sweetgrass, 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 Sweetgrass's primary NOAA station, SWEETGRASS.
The climate verdict for Sweetgrass
Sweetgrass, 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 68°F and January the coldest at 21°F.
- 44°F
- average temperature, NOAA 1991-2020 normal
- 133 days
- growing season, frost-free days
Sweetgrass: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00248093 · Sweetgrass, MT 44°F mean
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-UNK · SWING-WIDE · COMF-UNK · LOAD-HEAT · STN-1 · BOOK-PART
- TEMP-COOL 44°F
- RANK-COOL #892
- PHOTO-FINISH ≈ Buffalo
- PRCP-UNK Rain n/a
- SWING-WIDE 46°F
- COMF-UNK Comfort n/a
- LOAD-HEAT 8,119 HDD
- STN-1 USC00248093
- BOOK-PART 4/6 fields
Nearest mean-temperature peer: Buffalo, WY ( -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 MT station list.
- Sweetgrass (this station) 44°F
- Hot Clearmont, WY 44°F
- Near Lake City, MI 44°F
- Cold Buffalo, WY 43°F
- Near Hale, MI 43°F
Sweetgrass 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 · Sweetgrass
Sweetgrass: 15/100 · grade F
Sweetgrass publishes 3 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 3 missing weights rescale to 100.
PlainClimate-derived for Sweetgrass, not an official NOAA rating. Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 194 calendar days | 17/100 · F |
| Annual temperature balance | 43.5°F · 24.0° from 67.5°F | 14/100 · F |
| Frost-free season | 133 days/year | 14/100 · F |
Sweetgrass · 2026-08-04 · NOAA NCEI Climate Normals · method .
National standing · heating-led station
Where Sweetgrass sits across the climate record
Available NOAA 1991–2020 fields for Sweetgrass 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, Sweetgrass sits in the cooler third of annual means.
- Seasonal temperature swing
- 66th 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 | 32°F (0°C) | 10°F (-12°C) | 21°F (-6°C) | N/A | 29.4 | 0.0 |
| February | 35°F (2°C) | 12°F (-11°C) | 24°F (-5°C) | N/A | 25.3 | 0.0 |
| March | 44°F (7°C) | 21°F (-6°C) | 32°F (0°C) | N/A | 26.2 | 0.0 |
| April | 55°F (13°C) | 30°F (-1°C) | 42°F (6°C) | N/A | 17.5 | 0.0 |
| May | 66°F (19°C) | 39°F (4°C) | 53°F (11°C) | N/A | 5.8 | 0.0 |
| June | 73°F (23°C) | 47°F (8°C) | 60°F (16°C) | N/A | 0.3 | 0.7 |
| July | 82°F (28°C) | 53°F (12°C) | 68°F (20°C) | N/A | 0.1 | 7.1 |
| August | 82°F (28°C) | 51°F (11°C) | 67°F (19°C) | N/A | 0.2 | 7.2 |
| September | 72°F (22°C) | 42°F (6°C) | 57°F (14°C) | N/A | 3.7 | 0.5 |
| October | 57°F (14°C) | 32°F (0°C) | 45°F (7°C) | N/A | 15.9 | 0.0 |
| November | 43°F (6°C) | 21°F (-6°C) | 32°F (0°C) | N/A | 25.2 | 0.0 |
| December | 33°F (0°C) | 12°F (-11°C) | 22°F (-5°C) | N/A | 29.1 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 85°F around July 28, short of 90°F on every date, while 194 dates carry a normal low at or below freezing, the coldest 10°F near January 1.
The freezing stretch
The normal low stays at or below 32°F into April 26, then returns to freezing around October 16, covering 194 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 10 carries the biggest normal gap between afternoon and dawn, 31°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Sweetgrass.
Where Sweetgrass Stands Nationally
Freezing is routine here by normals standards — the normal low reaches 32°F or colder on about 194 nights a year, more than most ranked stations.
Sweetgrass 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
Frost Dates & Growing Season
First Fall Freeze
September 25
50% probability date
Last Spring Freeze
May 15
50% probability date
Growing Season
133 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
8,119
Higher = more heating needed
Cooling Degree Days
307
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside MT closest to Sweetgrass 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 Sweetgrass's climate pattern fits together
heating led · mid swing
Sweetgrass's energy balance leans toward cold weather: 8,119 annual heating degree days against 307 for cooling. Its 46.4°F seasonal range still makes the monthly rows more useful than the annual average alone.
Only about 133 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 Sweetgrass's middle-range seasonal profile. The measured spread is 46.4°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 Sweetgrass'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 Sweetgrass'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 Sweetgrass, not an official NOAA class or a year-ahead forecast.
Questions about Sweetgrass's climate
How cold does Sweetgrass get in winter? ▼
How much energy does heating and cooling require in Sweetgrass? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Sweetgrass's primary station: SWEETGRASS (USC00248093). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for Sweetgrass; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for Sweetgrass 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.