White Sulphur Springs, Montana climate: Normal weather by month, frost dates and records
White Sulphur Springs's normal year runs from 13°F December nights to 82°F July afternoons, with 13.0 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 5.6°C, December lows of −10°C, July highs of 28°C, 331 mm of precipitation a year.
- NOAA stationWhite Sulphur Springs #2
- Station IDUSC00248930
- Location46.54°N 110.90°W
- Elevation5,040 ft (1,536 m)
- Population1,021
On October 23, the normal high in White Sulphur Springs is 53°F and the normal low 27°F, and the chance of measurable rain or snow is 20%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for White Sulphur Springs.
- Jan 33° 13°
- Feb 35° 13°
- Mar 45° 21°
- Apr 53° 27°
- May 63° 35°
- Jun 71° 42°
- Jul 82° 48°
- Aug 81° 47°
- Sep 71° 39°
- Oct 56° 29°
- Nov 42° 20°
- Dec 33° 13°
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 White Sulphur Springs each month?
July is the warmest month, with normal highs of 82°F; December the coldest, with normal lows of 13°F. The most precipitation falls in June (2.52 in), the least in February (0.34 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 33°F | 13°F | 23.4°F | 0.51 | 5 | <1 | 29 | 9 h |
| February | 35°F | 13°F | 23.7°F | 0.34 | 4 | <1 | 27 | 10 h 20 min |
| March | 45°F | 21°F | 32.7°F | 0.71 | 6 | <1 | 28 | 11 h 50 min |
| April | 53°F | 27°F | 39.7°F | 1.44 | 8 | <1 | 24 | 13 h 30 min |
| May | 63°F | 35°F | 48.7°F | 2.08 | 11 | <1 | 12 | 15 h |
| June | 71°F | 42°F | 56.7°F | 2.52 | 12 | 1 | 1 | 15 h 50 min |
| July | 82°F | 48°F | 64.8°F | 1.36 | 8 | 4 | <1 | 15 h 30 min |
| August | 81°F | 47°F | 64.0°F | 1.21 | 8 | 4 | 1 | 14 h 20 min |
| September | 71°F | 39°F | 54.7°F | 1.04 | 7 | <1 | 5 | 12 h 40 min |
| October | 56°F | 29°F | 42.8°F | 0.86 | 7 | <1 | 19 | 11 h |
| November | 42°F | 20°F | 31.1°F | 0.44 | 5 | <1 | 25 | 9 h 30 min |
| December | 33°F | 13°F | 23.0°F | 0.53 | 5 | <1 | 30 | 8 h 40 min |
| Year (annual) | 55°F | 29°F | 42.1°F | 13.04 | 85 | 9 | 199 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 1°C | −10°C | −4.8°C | 13 mm |
| February | 1°C | −11°C | −4.6°C | 9 mm |
| March | 7°C | −6°C | 0.4°C | 18 mm |
| April | 12°C | −3°C | 4.3°C | 37 mm |
| May | 17°C | 2°C | 9.3°C | 53 mm |
| June | 22°C | 6°C | 13.7°C | 64 mm |
| July | 28°C | 9°C | 18.2°C | 35 mm |
| August | 27°C | 8°C | 17.8°C | 31 mm |
| September | 21°C | 4°C | 12.6°C | 26 mm |
| October | 13°C | −1°C | 6.0°C | 22 mm |
| November | 5°C | −6°C | −0.5°C | 11 mm |
| December | 0°C | −10°C | −5.0°C | 13 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Lennep (5 mi SW) (19 miles away), gets 96 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00248930; 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 White Sulphur Springs?
Normal highs sit between 65°F and 85°F in June, July, August and September. Of those, September has the fewest days with rain (7).
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 USC00248930.
When is the last frost in White Sulphur Springs?
In White Sulphur Springs, the last spring frost (32°F) comes after June 4 in half of years and after June 20 in one year in ten; the first autumn frost comes before September 11 in half of years and before August 27 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- June 41 year in 10 after June 20; 9 in 10 after May 21
- First autumn frost, half of years before
- September 111 year in 10 before August 27; 9 in 10 before September 27
NOAA puts the median frost-free season at 97 days, and the season without a hard freeze (28°F) at 128 days.
A hard freeze (28°F) comes after May 18 in half of springs and before September 25 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts White Sulphur Springs in zone 4b in ZIP code 59645, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, White Sulphur Springs's NOAA station is in zone 4b: the coldest night of a typical year reaches −23°F (16 complete years).
Frost dates for every NOAA station in Montana · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00248930; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in White Sulphur Springs?
In a normal year in White Sulphur Springs, 9 days a year reach 90°F, 199 nights fall to 32°F or colder and 85 days bring measurable precipitation.
- Days at 90°F or more
- 9a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 199a normal year
- Days that stay below freezing
- 45high of 32°F or less
- Days with 0.01 inch of precipitation
- 85a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00248930.
How sunny is White Sulphur Springs?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around White Sulphur Springs, 4.0 kWh per square metre a day. July is the sunniest month (85%) and December the cloudiest (64%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 73% | 1.7 |
| February | 76% | 2.8 |
| March | 72% | 3.9 |
| April | 68% | 4.8 |
| May | 69% | 5.7 |
| June | 74% | 6.5 |
| July | 85% | 7.2 |
| August | 84% | 6.0 |
| September | 78% | 4.4 |
| October | 71% | 2.8 |
| November | 66% | 1.7 |
| December | 64% | 1.3 |
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 White Sulphur Springs need?
A normal year in White Sulphur Springs brings 8,464 heating degree days, 58% more than the median U.S. place (5,373), and 150 cooling degree days, 83% fewer than the median (908). Nine months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 1,429 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,290 | 0 |
| February | 1,155 | 0 |
| March | 1,001 | 0 |
| April | 758 | 0 |
| May | 506 | 1 |
| June | 258 | 9 |
| July | 77 | 73 |
| August | 93 | 60 |
| September | 318 | 8 |
| October | 688 | 0 |
| November | 1,019 | 0 |
| December | 1,302 | 0 |
| Year (annual) | 8,464 | 150 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00248930. 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 White Sulphur Springs's climate compare?
White Sulphur Springs is warmer than 33 of the other 140 places with their own NOAA record in Montana, and wetter than 32. Across the 7,247 U.S. stations with normals, its annual mean of 42.1°F is warmer than 10%.
In the Köppen classification computed from these normals, White Sulphur Springs is BSk: cold semi-arid steppe. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near White Sulphur Springs share this climate record?
Springdale Colony has no NOAA station with 1991-2020 normals of its 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.
- Springdale Colony, MT0 people · 8 mi SW
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 White Sulphur Springs's climate
What is the coldest month in White Sulphur Springs?
December, with a normal high of 33°F and a normal low of 13°F. The warmest is July (82°F by day, 48°F at night).
Does it snow in White Sulphur Springs?
Yes. NOAA publishes no 1991-2020 snowfall normal for White Sulphur Springs's NOAA station; the nearest record that keeps one, Lennep (5 mi SW) (19 miles away), records 96 inches of snow in a normal year.
What is the rainiest month in White Sulphur Springs?
June, with 2.52 in of precipitation in a normal year; the driest is February with 0.34 in.
What plant hardiness zone is White Sulphur Springs in?
The USDA's 2023 map puts White Sulphur Springs in zone 4b in ZIP code 59645, the nearest ZIP area. By the same method at White Sulphur Springs's NOAA station, the coldest night of a typical year reaches −23°F (16 years, 1991-2020): zone 4b.
How late can frost come in White Sulphur Springs?
In half of years the last 32°F night comes after June 4; in one year in ten it comes after June 20. Waiting until June 20 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Montana climateThe statewide normals and every place in the state
- Lennep (5 mi SW), MT19 miles from this station, 38.7°F a year
- Millegan (14 mi SE), MT26 miles from this station, 40.9°F a year
- Martinsdale, MT27 miles from this station, 43.7°F a year
- Townsend, MT31 miles from this station, 44.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made