Bozeman, Montana climate: Normal weather by month, frost dates and records
Bozeman's normal year runs from 10°F December nights to 85°F July afternoons, with 13.4 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 6.1°C, December lows of −12°C, July highs of 30°C, 341 mm of precipitation a year.
- NOAA stationBozeman Gallatin Field
- Station IDUSW00024132
- Location45.79°N 111.16°W
- Elevation4,427 ft (1,349 m)
- Population57,894
On October 14, the normal high in Bozeman is 59°F and the normal low 30°F, and the chance of measurable rain or snow is 27%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Bozeman.
- Jan 32° 10°
- Feb 36° 13°
- Mar 46° 22°
- Apr 55° 29°
- May 65° 38°
- Jun 74° 44°
- Jul 85° 49°
- Aug 84° 47°
- Sep 73° 40°
- Oct 58° 29°
- Nov 42° 18°
- Dec 32° 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 Bozeman each month?
July is the warmest month, with normal highs of 85°F; December the coldest, with normal lows of 10°F. The most precipitation falls in June (2.54 in), the least in February (0.42 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 32°F | 10°F | 21.2°F | 0.44 | 7 | <1 | 30 | 9 h |
| February | 36°F | 13°F | 24.2°F | 0.42 | 7 | <1 | 27 | 10 h 20 min |
| March | 46°F | 22°F | 34.0°F | 0.93 | 9 | <1 | 28 | 11 h 50 min |
| April | 55°F | 29°F | 42.2°F | 1.68 | 13 | <1 | 21 | 13 h 30 min |
| May | 65°F | 38°F | 51.3°F | 2.12 | 13 | <1 | 7 | 14 h 50 min |
| June | 74°F | 44°F | 58.9°F | 2.54 | 13 | 2 | 1 | 15 h 40 min |
| July | 85°F | 49°F | 67.4°F | 1.08 | 8 | 11 | <1 | 15 h 20 min |
| August | 84°F | 47°F | 65.8°F | 0.94 | 8 | 9 | <1 | 14 h 10 min |
| September | 73°F | 40°F | 56.3°F | 1.00 | 7 | 2 | 5 | 12 h 40 min |
| October | 58°F | 29°F | 43.4°F | 1.10 | 9 | <1 | 21 | 11 h |
| November | 42°F | 18°F | 30.0°F | 0.74 | 8 | <1 | 28 | 9 h 30 min |
| December | 32°F | 10°F | 20.7°F | 0.44 | 7 | <1 | 30 | 8 h 40 min |
| Year (annual) | 57°F | 29°F | 42.9°F | 13.43 | 107 | 23 | 198 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 0°C | −12°C | −6.0°C | 11 mm |
| February | 2°C | −11°C | −4.3°C | 11 mm |
| March | 8°C | −6°C | 1.1°C | 24 mm |
| April | 13°C | −2°C | 5.7°C | 43 mm |
| May | 18°C | 3°C | 10.7°C | 54 mm |
| June | 23°C | 7°C | 14.9°C | 65 mm |
| July | 30°C | 10°C | 19.7°C | 27 mm |
| August | 29°C | 9°C | 18.8°C | 24 mm |
| September | 23°C | 4°C | 13.5°C | 25 mm |
| October | 14°C | −1°C | 6.3°C | 28 mm |
| November | 5°C | −8°C | −1.1°C | 19 mm |
| December | 0°C | −12°C | −6.3°C | 11 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. Bozeman's own co-op station Bozeman Montana State University does: 91 inches of snow in a normal year (see the other stations below).
Source: NOAA NCEI 1991-2020 monthly normals, station USW00024132; 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 Bozeman?
Normal highs sit between 65°F and 85°F in May, June, 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 USW00024132.
When is the last frost in Bozeman?
In Bozeman, the last spring frost (32°F) comes after May 26 in half of years and after June 12 in one year in ten; the first autumn frost comes before September 16 in half of years and before September 2 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
- May 261 year in 10 after June 12; 9 in 10 after May 11
- First autumn frost, half of years before
- September 161 year in 10 before September 2; 9 in 10 before September 29
NOAA puts the median frost-free season at 112 days, and the season without a hard freeze (28°F) at 140 days.
A hard freeze (28°F) comes after May 9 in half of springs and before September 28 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Bozeman in zone 5a in ZIP code 59718, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Bozeman's NOAA station is in zone 4a: the coldest night of a typical year reaches −26°F (30 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Montana · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00024132; 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 Bozeman?
In a normal year in Bozeman, 23 days a year reach 90°F (1 of them 100°F or more), 198 nights fall to 32°F or colder and 107 days bring measurable precipitation.
- Days at 90°F or more
- 23a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 198a normal year
- Days that stay below freezing
- 48high of 32°F or less
- Days with 0.01 inch of precipitation
- 107a normal year
The highest temperature in this station's record (since 1941) is 106°F, on July 6, 2007; the lowest is −46°F, on January 26, 1957.
The wettest calendar year on that record is 1969, with 20.04 in; the snowiest season is 1951–52, with 73.6 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USW00024132; records: ACIS (NOAA Regional Climate Centers), station USW00024132. Records use complete months only; a month missing more than three days is left out.
How humid and windy is Bozeman, and how clear are its skies?
The summer (June-August) dew point averages 44°F. The muggiest month is July, with an average dew point of 46°F; the driest air comes in December (13°F). April is the windiest month (7.0 mph on average), and July has the most clear or nearly clear hours (79%).
| Month | Dew point | Humidity | Afternoon humidity | Wind | Clear or few clouds | Overcast |
|---|---|---|---|---|---|---|
| January | 15°F | 70% | 57% | 5.0 mph | 43% | 36% |
| February | 16°F | 67% | 49% | 5.5 mph | 46% | 34% |
| March | 25°F | 61% | 39% | 6.6 mph | 40% | 33% |
| April | 31°F | 56% | 35% | 7.0 mph | 45% | 28% |
| May | 42°F | 62% | 40% | 6.2 mph | 48% | 25% |
| June | 46°F | 55% | 31% | 6.0 mph | 69% | 9% |
| July | 46°F | 49% | 24% | 6.1 mph | 79% | 6% |
| August | 40°F | 48% | 24% | 5.9 mph | 75% | 9% |
| September | 34°F | 56% | 31% | 5.5 mph | 66% | 17% |
| October | 25°F | 65% | 42% | 5.2 mph | 51% | 31% |
| November | 16°F | 72% | 57% | 4.7 mph | 45% | 37% |
| December | 13°F | 74% | 64% | 4.6 mph | 45% | 37% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00024132. Monthly averages of all hours; afternoon humidity at 3 p.m. local standard time; sky as the share of hours NOAA's observations rate clear or few clouds (a dash where NOAA publishes no sky value).
How sunny is Bozeman?
Over a year 74% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Bozeman, 4.1 kWh per square metre a day. July is the sunniest month (84%) and December the cloudiest (63%). Among the 459 U.S. places of 50,000 or more, that ranks tied 330th (with 21 others) in sunshine.
| 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 Bozeman need?
A normal year in Bozeman brings 8,245 heating degree days, 53% more than the median U.S. place (5,373), and 232 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 1,695 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,358 | 0 |
| February | 1,144 | 0 |
| March | 961 | 0 |
| April | 684 | 0 |
| May | 426 | 1 |
| June | 198 | 17 |
| July | 42 | 117 |
| August | 64 | 87 |
| September | 274 | 11 |
| October | 670 | 0 |
| November | 1,052 | 0 |
| December | 1,373 | 0 |
| Year (annual) | 8,245 | 232 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00024132. 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 Bozeman been warmer than normal lately?
2025 averaged 44.6°F, 1.7°F above the 1991-2020 normal of 42.9°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 44.9°F | +2.0°F | 10.82 |
| 2022 | 41.6°F | −1.3°F | 12.86 |
| 2023 | 43.1°F | +0.2°F | 14.49 |
| 2024 | 45.0°F | +2.1°F | 14.65 |
| 2025 | 44.6°F | +1.7°F | 12.46 |
Over 75 complete years from 1945 to 2025, the station's annual mean temperature rose at a fitted 4.2°F per century (+0.23°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USW00024132; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Bozeman's climate compare?
Bozeman is warmer than 45 of the other 140 places with their own NOAA record in Montana, and wetter than 40. Across the 7,247 U.S. stations with normals, its annual mean of 42.9°F is warmer than 12%.
In the Köppen classification computed from these normals, Bozeman 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 Bozeman share this climate record?
8 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.
- Belgrade, MT12,741 people · 1 mi SW
- Four Corners, MT5,562 people · 8 mi S
- King Arthur Park, MT2,343 people · 9 mi S
- Churchill, MT1,120 people · 8 mi W
- Gallatin Gateway, MT1,092 people · 14 mi S
- Amsterdam, MT145 people · 9 mi W
- Bridger, MT119 people · 13 mi E
- Springhill, MT118 people · 8 mi NE
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 Bozeman's other NOAA stations record?
2 more NOAA stations keep 1991-2020 normals in or near Bozeman. This page uses Bozeman Gallatin Field; the others differ by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Bozeman 6 W Experiment Farm USC00241047 | 8 mi S | 4,775 ft | 44.4°F | 15°F | 83°F | 15.8 | – | May 23 |
| Bozeman Montana State University USC00241044 | 10 mi SE | 4,913 ft | 44.1°F | 15°F | 82°F | 20.0 | 91 | May 26 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Bozeman's climate
What is the coldest month in Bozeman?
December, with a normal high of 32°F and a normal low of 10°F. The warmest is July (85°F by day, 49°F at night).
Does it snow in Bozeman?
Yes. NOAA publishes no 1991-2020 snowfall normal for Bozeman's NOAA station; Bozeman's own co-op station Bozeman Montana State University records 91 inches of snow in a normal year.
What is the rainiest month in Bozeman?
June, with 2.54 in of precipitation in a normal year; the driest is February with 0.42 in.
What plant hardiness zone is Bozeman in?
The USDA's 2023 map puts Bozeman in zone 5a in ZIP code 59718, the nearest ZIP area. By the same method at Bozeman's NOAA station, the coldest night of a typical year reaches −26°F (30 years, 1991-2020): zone 4a.
How late can frost come in Bozeman?
In half of years the last 32°F night comes after May 26; in one year in ten it comes after June 12. Waiting until June 12 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Bozeman in OctoberThis month day by day, its records and recent years
- Montana climateThe statewide normals and every place in the state
- Logan, MT14 miles from this station, 42.7°F a year
- Trident, MT19 miles from this station, 45.4°F a year
- Wilsall, MT28 miles from this station, 41.5°F a year
- Norris, MT31 miles from this station, 49.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made