Wilsall, Montana climate: Normal weather by month, frost dates and records
Wilsall's normal year runs from 11°F January nights to 84°F July afternoons, with 14.9 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 5.3°C, January lows of −12°C, July highs of 29°C, 378 mm of precipitation a year.
- NOAA stationWilsall (1 mi S)
- Station IDUSC00241840
- Location45.99°N 110.66°W
- Elevation5,015 ft (1,529 m)
- Population (census place)221
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Wilsall.
- Jan 31° 11°
- Feb 36° 14°
- Mar 43° 21°
- Apr 52° 26°
- May 61° 37°
- Jun 71° 41°
- Jul 84° 49°
- Aug 82° 47°
- Sep 70° 35°
- Oct 56° 29°
- Nov 42° 15°
- Dec 34° 10°
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 Wilsall each month?
July is the warmest month, with normal highs of 84°F; January the coldest, with normal lows of 11°F. The most precipitation falls in June (2.35 in), the least in December (0.48 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 31°F | 11°F | 20.8°F | 0.51 | 4 | <1 | 31 | 9 h |
| February | 36°F | 14°F | 24.7°F | 0.56 | 5 | <1 | 28 | 10 h 20 min |
| March | 43°F | 21°F | 32.0°F | 1.07 | 5 | <1 | 31 | 11 h 50 min |
| April | 52°F | 26°F | 39.2°F | 1.75 | 8 | <1 | 25 | 13 h 30 min |
| May | 61°F | 37°F | 49.0°F | 2.27 | 10 | <1 | 10 | 14 h 50 min |
| June | 71°F | 41°F | 56.3°F | 2.35 | 11 | <1 | 2 | 15 h 40 min |
| July | 84°F | 49°F | 66.1°F | 1.40 | 6 | 3 | <1 | 15 h 30 min |
| August | 82°F | 47°F | 64.9°F | 1.13 | 6 | 6 | <1 | 14 h 10 min |
| September | 70°F | 35°F | 52.7°F | 1.32 | 6 | 1 | 10 | 12 h 40 min |
| October | 56°F | 29°F | 42.4°F | 1.31 | 6 | <1 | 25 | 11 h |
| November | 42°F | 15°F | 28.8°F | 0.74 | 5 | <1 | 28 | 9 h 30 min |
| December | 34°F | 10°F | 21.7°F | 0.48 | 4 | <1 | 31 | 8 h 40 min |
| Year (annual) | 55°F | 28°F | 41.5°F | 14.89 | 75 | 9 | 220 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −1°C | −12°C | −6.2°C | 13 mm |
| February | 2°C | −10°C | −4.1°C | 14 mm |
| March | 6°C | −6°C | 0.0°C | 27 mm |
| April | 11°C | −3°C | 4.0°C | 44 mm |
| May | 16°C | 3°C | 9.4°C | 58 mm |
| June | 22°C | 5°C | 13.5°C | 60 mm |
| July | 29°C | 9°C | 18.9°C | 36 mm |
| August | 28°C | 8°C | 18.3°C | 29 mm |
| September | 21°C | 2°C | 11.5°C | 34 mm |
| October | 13°C | −2°C | 5.8°C | 33 mm |
| November | 6°C | −9°C | −1.8°C | 19 mm |
| December | 1°C | −12°C | −5.7°C | 12 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. Wilsall's own co-op station Wilsall (8 mi ENE) does: 82 inches of snow in a normal year (see the other stations below).
Source: NOAA NCEI 1991-2020 monthly normals, station USC00241840; 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 Wilsall?
Normal highs sit between 65°F and 85°F in June, July, August and September. Of those, August has the fewest days with rain (6).
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 USC00241840.
When is the last frost in Wilsall?
In Wilsall, the last spring frost (32°F) comes after June 4 in half of years and after June 23 in one year in ten; the first autumn frost comes before September 6 in half of years and before August 28 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 23; 9 in 10 after May 19
- First autumn frost, half of years before
- September 61 year in 10 before August 28; 9 in 10 before September 15
NOAA puts the median frost-free season at 92 days, and the season without a hard freeze (28°F) at 117 days.
A hard freeze (28°F) comes after May 16 in half of springs and before September 13 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Wilsall in zone 4b in ZIP code 59086, the nearest ZIP area.
Frost dates for every NOAA station in Montana · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00241840; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Wilsall?
In a normal year in Wilsall, 9 days a year reach 90°F, 220 nights fall to 32°F or colder and 75 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
- 220a normal year
- Days that stay below freezing
- 67high of 32°F or less
- Days with 0.01 inch of precipitation
- 75a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00241840.
How sunny is Wilsall?
Over a year 74% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Wilsall, 4.1 kWh per square metre a day. July is the sunniest month (84%) and December the cloudiest (63%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 69% | 1.7 |
| February | 73% | 2.8 |
| March | 70% | 3.8 |
| April | 66% | 4.8 |
| May | 67% | 5.6 |
| June | 75% | 6.6 |
| July | 84% | 7.2 |
| August | 83% | 6.1 |
| September | 79% | 4.6 |
| October | 69% | 2.9 |
| November | 66% | 1.8 |
| December | 63% | 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 Wilsall need?
A normal year in Wilsall brings 8,697 heating degree days, 62% more than the median U.S. place (5,373), and 167 cooling degree days, 82% 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 1,350 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,372 | 0 |
| February | 1,128 | 0 |
| March | 1,025 | 0 |
| April | 774 | 0 |
| May | 496 | 0 |
| June | 267 | 5 |
| July | 48 | 80 |
| August | 86 | 81 |
| September | 370 | 1 |
| October | 701 | 0 |
| November | 1,087 | 0 |
| December | 1,343 | 0 |
| Year (annual) | 8,697 | 167 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00241840. 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.
Has Wilsall been warmer than normal lately?
2025 averaged 40.6°F, 0.9°F below the 1991-2020 normal of 41.5°F. 0 of the 4 complete years since 2022 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2022 | 37.6°F | −3.9°F | 13.11 |
| 2023 | 37.5°F | −4.0°F | 17.60 |
| 2024 | 40.5°F | −1.0°F | 13.89 |
| 2025 | 40.6°F | −0.9°F | 16.20 |
Source: observed years: ACIS, station USC00241840. A year counts only with all twelve months complete.
How does Wilsall's climate compare?
Wilsall is warmer than 23 of the other 140 places with their own NOAA record in Montana, and wetter than 65. Across the 7,247 U.S. stations with normals, its annual mean of 41.5°F is warmer than 8%.
In the Köppen classification computed from these normals, Wilsall is Dfb: continental, no dry season, warm summer. 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 Wilsall 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.
- Clyde Park, MT348 people · 8 mi S
- Sedan, MT124 people · 11 mi W
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
What do Wilsall's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Wilsall. This page uses Wilsall (1 mi S); the other differs by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Wilsall (8 mi ENE) USC00249023 | 8 mi E | 5,865 ft | 40.7°F | 14°F | 79°F | 19.3 | 82 | June 8 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Wilsall's climate
What is the coldest month in Wilsall?
January, with a normal high of 31°F and a normal low of 11°F. The warmest is July (84°F by day, 49°F at night).
Does it snow in Wilsall?
Yes. NOAA publishes no 1991-2020 snowfall normal for Wilsall's NOAA station; Wilsall's own co-op station Wilsall (8 mi ENE) records 82 inches of snow in a normal year.
What is the rainiest month in Wilsall?
June, with 2.35 in of precipitation in a normal year; the driest is December with 0.48 in.
What plant hardiness zone is Wilsall in?
The USDA's 2023 map puts Wilsall in zone 4b in ZIP code 59086, the nearest ZIP area.
How late can frost come in Wilsall?
In half of years the last 32°F night comes after June 4; in one year in ten it comes after June 23. Waiting until June 23 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Montana climateThe statewide normals and every place in the state
- Livingston, MT22 miles from this station, 45.4°F a year
- Lennep (5 mi SW), MT26 miles from this station, 38.7°F a year
- Bozeman, MT28 miles from this station, 42.9°F a year
- Melville (4 mi W), MT30 miles from this station, 40.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made