Brockway, Montana climate: Normal weather by month, frost dates and records
Brockway's normal year runs from 7°F January nights to 85°F July afternoons, with 12.4 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 6.7°C, January lows of −14°C, July highs of 30°C, 316 mm of precipitation a year.
- NOAA stationBrockway (3 mi WSW)
- Station IDUSC00241169
- Location47.29°N 105.83°W
- Elevation2,630 ft (802 m)
- Population (census place)2
On October 22, the normal high in Brockway is 54°F and the normal low 29°F, and the chance of measurable rain or snow is 8%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Brockway.
- Jan 29° 7°
- Feb 33° 11°
- Mar 45° 21°
- Apr 57° 31°
- May 67° 40°
- Jun 76° 50°
- Jul 85° 56°
- Aug 85° 54°
- Sep 73° 44°
- Oct 57° 32°
- Nov 43° 20°
- Dec 31° 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 Brockway each month?
July is the warmest month, with normal highs of 85°F; January the coldest, with normal lows of 7°F. The most precipitation falls in June (2.54 in), the least in February (0.18 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 29°F | 7°F | 18.0°F | 0.24 | 2 | <1 | 30 | 8 h 50 min |
| February | 33°F | 11°F | 21.5°F | 0.18 | 2 | <1 | 27 | 10 h 10 min |
| March | 45°F | 21°F | 32.6°F | 0.29 | 3 | <1 | 26 | 11 h 50 min |
| April | 57°F | 31°F | 43.6°F | 1.16 | 5 | <1 | 18 | 13 h 30 min |
| May | 67°F | 40°F | 53.5°F | 2.48 | 7 | <1 | 6 | 15 h |
| June | 76°F | 50°F | 63.2°F | 2.54 | 8 | 3 | <1 | 15 h 50 min |
| July | 85°F | 56°F | 70.5°F | 2.07 | 6 | 11 | <1 | 15 h 40 min |
| August | 85°F | 54°F | 69.5°F | 1.14 | 4 | 11 | <1 | 14 h 20 min |
| September | 73°F | 44°F | 58.7°F | 1.08 | 4 | 3 | 3 | 12 h 40 min |
| October | 57°F | 32°F | 44.7°F | 0.86 | 3 | <1 | 16 | 11 h |
| November | 43°F | 20°F | 31.1°F | 0.21 | 2 | <1 | 27 | 9 h 20 min |
| December | 31°F | 10°F | 20.8°F | 0.20 | 2 | <1 | 30 | 8 h 30 min |
| Year (annual) | 57°F | 31°F | 44.0°F | 12.45 | 46 | 28 | 183 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −2°C | −14°C | −7.8°C | 6 mm |
| February | 0°C | −12°C | −5.8°C | 5 mm |
| March | 7°C | −6°C | 0.3°C | 7 mm |
| April | 14°C | −1°C | 6.4°C | 29 mm |
| May | 19°C | 5°C | 11.9°C | 63 mm |
| June | 25°C | 10°C | 17.3°C | 65 mm |
| July | 30°C | 13°C | 21.4°C | 53 mm |
| August | 29°C | 12°C | 20.8°C | 29 mm |
| September | 23°C | 7°C | 14.8°C | 27 mm |
| October | 14°C | 0°C | 7.1°C | 22 mm |
| November | 6°C | −7°C | −0.5°C | 5 mm |
| December | 0°C | −12°C | −6.2°C | 5 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 USC00241169; 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 Brockway?
Normal highs sit between 65°F and 85°F in May, June, August and September. Of those, August has the fewest days with rain (4).
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 USC00241169.
When is the last frost in Brockway?
In Brockway, the last spring frost (32°F) comes after May 20 in half of years and after June 5 in one year in ten; the first autumn frost comes before September 19 in half of years and before September 4 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 201 year in 10 after June 5; 9 in 10 after May 6
- First autumn frost, half of years before
- September 191 year in 10 before September 4; 9 in 10 before October 2
NOAA puts the median frost-free season at 121 days, and the season without a hard freeze (28°F) at 141 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 Brockway in zone 4a in ZIP code 59214, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Brockway's NOAA station is in zone 4a: the coldest night of a typical year reaches −28°F (18 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 USC00241169; 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 Brockway?
In a normal year in Brockway, 28 days a year reach 90°F (3 of them 100°F or more), 183 nights fall to 32°F or colder and 46 days bring measurable precipitation.
- Days at 90°F or more
- 28a normal year
- Days at 100°F or more
- 3a normal year
- Nights at 32°F or colder
- 183a normal year
- Days that stay below freezing
- 54high of 32°F or less
- Days with 0.01 inch of precipitation
- 46a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00241169.
How sunny is Brockway?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Brockway, 4.0 kWh per square metre a day. July is the sunniest month (87%) and December the cloudiest (70%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 77% | 1.7 |
| February | 79% | 2.7 |
| March | 75% | 3.8 |
| April | 72% | 4.9 |
| May | 74% | 5.9 |
| June | 79% | 6.7 |
| July | 87% | 7.0 |
| August | 85% | 5.8 |
| September | 79% | 4.2 |
| October | 74% | 2.7 |
| November | 72% | 1.7 |
| December | 70% | 1.2 |
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 Brockway need?
A normal year in Brockway brings 8,117 heating degree days, 51% more than the median U.S. place (5,373), and 488 cooling degree days, 46% 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 2,199 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,457 | 0 |
| February | 1,218 | 0 |
| March | 1,005 | 0 |
| April | 641 | 0 |
| May | 364 | 9 |
| June | 115 | 59 |
| July | 24 | 195 |
| August | 42 | 183 |
| September | 230 | 40 |
| October | 633 | 2 |
| November | 1,018 | 0 |
| December | 1,370 | 0 |
| Year (annual) | 8,117 | 488 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00241169. 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 Brockway been warmer than normal lately?
2024 averaged 46.6°F, 2.6°F above the 1991-2020 normal of 44.0°F. 3 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 45.8°F | +1.8°F | 6.74 |
| 2022 | 43.1°F | −0.9°F | 10.91 |
| 2023 | 45.9°F | +1.9°F | 13.16 |
| 2024 | 46.6°F | +2.6°F | 11.27 |
Source: observed years: ACIS, station USC00241169. A year counts only with all twelve months complete.
How does Brockway's climate compare?
Brockway is warmer than 74 of the other 140 places with their own NOAA record in Montana, and wetter than 22. Across the 7,247 U.S. stations with normals, its annual mean of 44.0°F is warmer than 15%.
In the Köppen classification computed from these normals, Brockway 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 Brockway's climate
What is the coldest month in Brockway?
January, with a normal high of 29°F and a normal low of 7°F. The warmest is July (85°F by day, 56°F at night).
What is the rainiest month in Brockway?
June, with 2.54 in of precipitation in a normal year; the driest is February with 0.18 in.
What plant hardiness zone is Brockway in?
The USDA's 2023 map puts Brockway in zone 4a in ZIP code 59214, the nearest ZIP area. By the same method at Brockway's NOAA station, the coldest night of a typical year reaches −28°F (18 years, 1991-2020): zone 4a.
How late can frost come in Brockway?
In half of years the last 32°F night comes after May 20; in one year in ten it comes after June 5. Waiting until June 5 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Montana climateThe statewide normals and every place in the state
- Circle, MT14 miles from this station, 45.1°F a year
- Rock Springs, MT38 miles from this station, 44.3°F a year
- Cohagen, MT40 miles from this station, 43.6°F a year
- Terry, MT42 miles from this station, 45.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made