Broadus, Montana climate: Normal weather by month, frost dates and records
Broadus's normal year runs from 11°F January nights to 91°F July afternoons, with 14.9 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.0°C, January lows of −11°C, July highs of 33°C, 379 mm of precipitation a year.
- NOAA stationBroadus
- Station IDUSC00241127
- Location45.44°N 105.41°W
- Elevation3,032 ft (924 m)
- Population466
On October 22, the normal high in Broadus is 60°F and the normal low 32°F, and the chance of measurable rain or snow is 17%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Broadus.
- Jan 37° 11°
- Feb 40° 14°
- Mar 52° 24°
- Apr 61° 33°
- May 71° 42°
- Jun 81° 52°
- Jul 91° 59°
- Aug 90° 56°
- Sep 79° 46°
- Oct 63° 34°
- Nov 48° 22°
- Dec 38° 14°
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 Broadus each month?
July is the warmest month, with normal highs of 91°F; January the coldest, with normal lows of 11°F. The most precipitation falls in May (2.75 in), the least in January (0.43 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 37°F | 11°F | 24.1°F | 0.43 | 5 | <1 | 30 | 9 h |
| February | 40°F | 14°F | 27.4°F | 0.52 | 5 | <1 | 27 | 10 h 20 min |
| March | 52°F | 24°F | 37.6°F | 0.78 | 5 | <1 | 26 | 11 h 50 min |
| April | 61°F | 33°F | 46.7°F | 1.77 | 7 | <1 | 15 | 13 h 30 min |
| May | 71°F | 42°F | 56.4°F | 2.75 | 10 | 1 | 4 | 14 h 50 min |
| June | 81°F | 52°F | 66.7°F | 2.37 | 9 | 5 | <1 | 15 h 40 min |
| July | 91°F | 59°F | 74.8°F | 1.72 | 7 | 17 | <1 | 15 h 20 min |
| August | 90°F | 56°F | 72.8°F | 1.28 | 6 | 17 | <1 | 14 h 10 min |
| September | 79°F | 46°F | 62.4°F | 1.23 | 5 | 5 | 2 | 12 h 40 min |
| October | 63°F | 34°F | 48.7°F | 1.12 | 6 | <1 | 13 | 11 h |
| November | 48°F | 22°F | 35.1°F | 0.47 | 4 | <1 | 26 | 9 h 30 min |
| December | 38°F | 14°F | 25.6°F | 0.48 | 4 | <1 | 30 | 8 h 40 min |
| Year (annual) | 63°F | 34°F | 48.2°F | 14.92 | 72 | 45 | 172 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 3°C | −11°C | −4.4°C | 11 mm |
| February | 5°C | −10°C | −2.6°C | 13 mm |
| March | 11°C | −5°C | 3.1°C | 20 mm |
| April | 16°C | 0°C | 8.2°C | 45 mm |
| May | 21°C | 6°C | 13.6°C | 70 mm |
| June | 27°C | 11°C | 19.3°C | 60 mm |
| July | 33°C | 15°C | 23.8°C | 44 mm |
| August | 32°C | 13°C | 22.7°C | 33 mm |
| September | 26°C | 8°C | 16.9°C | 31 mm |
| October | 17°C | 1°C | 9.3°C | 28 mm |
| November | 9°C | −5°C | 1.7°C | 12 mm |
| December | 3°C | −10°C | −3.6°C | 12 mm |
NOAA publishes no 1991-2020 snowfall normal for this station, and no record within 25 miles keeps one, so snow is left out here rather than estimated.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00241127; 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 Broadus?
Normal highs sit between 65°F and 85°F in May, June and September. Of those, September has the fewest days with rain (5).
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 USC00241127.
When is the last frost in Broadus?
In Broadus, the last spring frost (32°F) comes after May 16 in half of years and after May 29 in one year in ten; the first autumn frost comes before September 28 in half of years and before September 13 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 161 year in 10 after May 29; 9 in 10 after May 2
- First autumn frost, half of years before
- September 281 year in 10 before September 13; 9 in 10 before October 11
NOAA puts the median frost-free season at 135 days, and the season without a hard freeze (28°F) at 155 days.
A hard freeze (28°F) comes after May 3 in half of springs and before October 7 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Broadus in zone 4b in ZIP code 59317, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Broadus's NOAA station is in zone 4b: the coldest night of a typical year reaches −23°F (21 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 USC00241127; 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 Broadus?
In a normal year in Broadus, 45 days a year reach 90°F (6 of them 100°F or more), 172 nights fall to 32°F or colder and 72 days bring measurable precipitation.
- Days at 90°F or more
- 45a normal year
- Days at 100°F or more
- 6a normal year
- Nights at 32°F or colder
- 172a normal year
- Days that stay below freezing
- 36high of 32°F or less
- Days with 0.01 inch of precipitation
- 72a normal year
The highest temperature in this station's record (since 1920) is 110°F, on June 15, 2021; the lowest is −47°F, on December 22, 1989.
The wettest calendar year on that record is 2019, with 24.09 in; the snowiest season is 1985–86, with 91.6 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00241127; records: ACIS (NOAA Regional Climate Centers), station USC00241127. Records use complete months only; a month missing more than three days is left out.
How sunny is Broadus?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Broadus, 4.2 kWh per square metre a day. July is the sunniest month (89%) and December the cloudiest (71%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 77% | 1.9 |
| February | 77% | 2.9 |
| March | 73% | 3.9 |
| April | 71% | 4.9 |
| May | 73% | 5.9 |
| June | 81% | 6.9 |
| July | 89% | 7.3 |
| August | 87% | 6.1 |
| September | 82% | 4.6 |
| October | 74% | 3.0 |
| November | 74% | 2.0 |
| December | 71% | 1.4 |
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 Broadus need?
A normal year in Broadus brings 6,871 heating degree days, 28% more than the median U.S. place (5,373), and 779 cooling degree days, 14% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,783 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,268 | 0 |
| February | 1,054 | 0 |
| March | 850 | 0 |
| April | 551 | 1 |
| May | 287 | 20 |
| June | 64 | 114 |
| July | 7 | 311 |
| August | 18 | 261 |
| September | 146 | 68 |
| October | 510 | 5 |
| November | 895 | 0 |
| December | 1,221 | 0 |
| Year (annual) | 6,871 | 779 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00241127. 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 Broadus been warmer than normal lately?
2024 averaged 50.4°F, 2.2°F above the 1991-2020 normal of 48.2°F. 3 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 50.4°F | +2.2°F | 13.44 |
| 2022 | 47.9°F | −0.3°F | 14.70 |
| 2023 | 49.3°F | +1.1°F | 15.90 |
| 2024 | 50.4°F | +2.2°F | 11.07 |
Over 70 complete years from 1922 to 2024, the station's annual mean temperature rose at a fitted 3.5°F per century (+0.19°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00241127; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Broadus's climate compare?
Broadus is warmer than 138 of the other 140 places with their own NOAA record in Montana, and wetter than 69. Across the 7,247 U.S. stations with normals, its annual mean of 48.2°F is warmer than 33%.
In the Köppen classification computed from these normals, Broadus 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.
Questions about Broadus's climate
What is the coldest month in Broadus?
January, with a normal high of 37°F and a normal low of 11°F. The warmest is July (91°F by day, 59°F at night).
What is the rainiest month in Broadus?
May, with 2.75 in of precipitation in a normal year; the driest is January with 0.43 in.
What plant hardiness zone is Broadus in?
The USDA's 2023 map puts Broadus in zone 4b in ZIP code 59317, the nearest ZIP area. By the same method at Broadus's NOAA station, the coldest night of a typical year reaches −23°F (21 years, 1991-2020): zone 4b.
How late can frost come in Broadus?
In half of years the last 32°F night comes after May 16; in one year in ten it comes after May 29. Waiting until May 29 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Montana climateThe statewide normals and every place in the state
- Moorhead (9 mi NE), MT25 miles from this station, 46.2°F a year
- Sonnette (7 mi SW), MT26 miles from this station, 44.8°F a year
- Biddle, MT28 miles from this station, 47.4°F a year
- Powderville (8 mi NNE), MT34 miles from this station, 47.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made