St. Regis, Montana climate: Normal weather by month, frost dates and records
St. Regis's normal year runs from 21°F December nights to 86°F July afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.9°C, December lows of −6°C, July highs of 30°C.
- NOAA stationSaint Regis (1 mi NE)
- Station IDUSC00247318
- Location47.30°N 115.09°W
- Elevation2,660 ft (811 m)
- Population (census place)344
On October 9, the normal high in St. Regis is 63°F and the normal low 34°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for St. Regis.
- Jan 35° 22°
- Feb 41° 21°
- Mar 51° 26°
- Apr 59° 32°
- May 69° 38°
- Jun 77° 44°
- Jul 86° 47°
- Aug 87° 45°
- Sep 76° 39°
- Oct 59° 32°
- Nov 42° 26°
- Dec 33° 21°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in St. Regis each month?
July is the warmest month, with normal highs of 86°F; December the coldest, with normal lows of 21°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 35°F | 22°F | 28.3°F | – | <1 | 29 | 8 h 50 min |
| February | 41°F | 21°F | 31.2°F | – | <1 | 27 | 10 h 10 min |
| March | 51°F | 26°F | 38.4°F | – | <1 | 26 | 11 h 50 min |
| April | 59°F | 32°F | 45.2°F | – | <1 | 18 | 13 h 30 min |
| May | 69°F | 38°F | 53.6°F | – | 1 | 9 | 15 h |
| June | 77°F | 44°F | 60.3°F | – | 3 | 3 | 15 h 50 min |
| July | 86°F | 47°F | 66.8°F | – | 12 | 1 | 15 h 40 min |
| August | 87°F | 45°F | 66.0°F | – | 11 | 2 | 14 h 20 min |
| September | 76°F | 39°F | 57.7°F | – | 2 | 6 | 12 h 40 min |
| October | 59°F | 32°F | 45.3°F | – | <1 | 18 | 11 h |
| November | 42°F | 26°F | 34.1°F | – | <1 | 24 | 9 h 20 min |
| December | 33°F | 21°F | 27.1°F | – | <1 | 30 | 8 h 30 min |
| Year (annual) | 60°F | 33°F | 46.2°F | – | 29 | 191 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | 2°C | −6°C | −2.1°C |
| February | 5°C | −6°C | −0.4°C |
| March | 10°C | −3°C | 3.6°C |
| April | 15°C | 0°C | 7.3°C |
| May | 21°C | 3°C | 12.0°C |
| June | 25°C | 7°C | 15.7°C |
| July | 30°C | 8°C | 19.3°C |
| August | 30°C | 7°C | 18.9°C |
| September | 24°C | 4°C | 14.3°C |
| October | 15°C | 0°C | 7.4°C |
| November | 5°C | −3°C | 1.2°C |
| December | 1°C | −6°C | −2.7°C |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Thompson Falls (24 miles away), gets 15 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00247318; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit St. Regis?
Normal highs sit between 65°F and 85°F in May, June and September.
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00247318.
How hot and how cold does it get in St. Regis?
In a normal year in St. Regis, 29 days a year reach 90°F (1 of them 100°F or more) and 191 nights fall to 32°F or colder.
- Days at 90°F or more
- 29a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 191a normal year
- Days that stay below freezing
- 29high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00247318.
How sunny is St. Regis?
Over a year 71% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around St. Regis, 3.7 kWh per square metre a day. July is the sunniest month (87%) and December the cloudiest (51%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 54% | 1.1 |
| February | 60% | 2.0 |
| March | 62% | 3.2 |
| April | 66% | 4.5 |
| May | 69% | 5.6 |
| June | 71% | 6.2 |
| July | 87% | 7.3 |
| August | 84% | 6.0 |
| September | 77% | 4.2 |
| October | 66% | 2.5 |
| November | 54% | 1.3 |
| December | 51% | 0.9 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does St. Regis need?
A normal year in St. Regis brings 7,074 heating degree days, 32% more than the median U.S. place (5,373), and 235 cooling degree days, 74% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 1,792 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,139 | 0 |
| February | 946 | 0 |
| March | 823 | 0 |
| April | 592 | 0 |
| May | 356 | 4 |
| June | 165 | 24 |
| July | 51 | 106 |
| August | 60 | 91 |
| September | 229 | 10 |
| October | 611 | 0 |
| November | 927 | 0 |
| December | 1,175 | 0 |
| Year (annual) | 7,074 | 235 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00247318. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
How does St. Regis's climate compare?
St. Regis is warmer than 117 of the other 140 places with their own NOAA record in Montana. Across the 7,247 U.S. stations with normals, its annual mean of 46.2°F is warmer than 24%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Which places near St. Regis share this climate record?
2 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Plains, MT1,244 people · 14 mi NE
- Weeksville, MT100 people · 16 mi N
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about St. Regis's climate
What is the coldest month in St. Regis?
December, with a normal high of 33°F and a normal low of 21°F. The warmest is July (86°F by day, 47°F at night).
Does it snow in St. Regis?
Yes. NOAA publishes no 1991-2020 snowfall normal for St. Regis's NOAA station; the nearest record that keeps one, Thompson Falls (24 miles away), records 15 inches of snow in a normal year.
What plant hardiness zone is St. Regis in?
The USDA's 2023 map puts St. Regis in zone 6a in ZIP code 59866, the nearest ZIP area. By the same method at St. Regis's NOAA station, the coldest night of a typical year reaches −11°F (17 years, 1991-2020): zone 5b.
Nearby and next
- Montana climateThe statewide normals and every place in the state
- Superior, MT12 miles from this station, 47.7°F a year
- Haugan, MT17 miles from this station, 42.2°F a year
- Thompson Falls, MT24 miles from this station, 47.7°F a year
- Mullan, ID28 miles from this station, 38.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made