Redstone, Montana climate: Normal weather by month, frost dates and records
Redstone's normal year runs from −1°F January nights to 82°F July afternoons, with 14.3 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 4.3°C, January lows of −18°C, July highs of 28°C, 363 mm of precipitation a year.
- NOAA stationRedstone
- Station IDUSC00246927
- Location48.82°N 104.94°W
- Elevation2,106 ft (642 m)
- Population (census place)23
On October 22, the normal high in Redstone is 51°F and the normal low 25°F, and the chance of measurable rain or snow is 10%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Redstone.
- Jan 24° -1°
- Feb 26° 4°
- Mar 39° 15°
- Apr 56° 26°
- May 67° 37°
- Jun 75° 47°
- Jul 82° 51°
- Aug 82° 49°
- Sep 72° 38°
- Oct 55° 27°
- Nov 38° 14°
- Dec 26° 3°
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 Redstone each month?
July is the warmest month, with normal highs of 82°F; January the coldest, with normal lows of −1°F. The most precipitation falls in June (3.08 in), the least in February (0.24 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 24°F | −1°F | 11.2°F | 0.42 | 3 | <1 | 31 | 8 h 40 min |
| February | 26°F | 4°F | 15.1°F | 0.24 | 2 | <1 | 28 | 10 h 10 min |
| March | 39°F | 15°F | 27.1°F | 0.67 | 3 | <1 | 29 | 11 h 50 min |
| April | 56°F | 26°F | 40.7°F | 0.86 | 5 | <1 | 21 | 13 h 40 min |
| May | 67°F | 37°F | 52.0°F | 2.22 | 6 | 1 | 9 | 15 h 10 min |
| June | 75°F | 47°F | 60.9°F | 3.08 | 8 | 2 | 2 | 16 h 10 min |
| July | 82°F | 51°F | 66.7°F | 2.14 | 7 | 8 | 1 | 15 h 50 min |
| August | 82°F | 49°F | 65.5°F | 1.80 | 6 | 10 | 2 | 14 h 30 min |
| September | 72°F | 38°F | 55.1°F | 0.97 | 4 | 2 | 7 | 12 h 40 min |
| October | 55°F | 27°F | 41.2°F | 0.88 | 4 | <1 | 21 | 10 h 50 min |
| November | 38°F | 14°F | 26.0°F | 0.43 | 3 | <1 | 28 | 9 h 10 min |
| December | 26°F | 3°F | 14.4°F | 0.57 | 3 | <1 | 31 | 8 h 20 min |
| Year (annual) | 54°F | 26°F | 39.7°F | 14.28 | 51 | 23 | 209 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −5°C | −18°C | −11.6°C | 11 mm |
| February | −3°C | −16°C | −9.4°C | 6 mm |
| March | 4°C | −9°C | −2.7°C | 17 mm |
| April | 13°C | −3°C | 4.8°C | 22 mm |
| May | 19°C | 3°C | 11.1°C | 56 mm |
| June | 24°C | 8°C | 16.1°C | 78 mm |
| July | 28°C | 11°C | 19.3°C | 54 mm |
| August | 28°C | 9°C | 18.6°C | 46 mm |
| September | 22°C | 4°C | 12.8°C | 25 mm |
| October | 13°C | −3°C | 5.1°C | 22 mm |
| November | 3°C | −10°C | −3.3°C | 11 mm |
| December | −4°C | −16°C | −9.8°C | 14 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Raymond Border Station (21 miles away), gets 31 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00246927; 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 Redstone?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, September 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 USC00246927.
When is the last frost in Redstone?
In Redstone, the last spring frost (32°F) comes after May 28 in half of years and after June 13 in one year in ten; the first autumn frost comes before September 7 in half of years and before August 22 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 281 year in 10 after June 13; 9 in 10 after May 15
- First autumn frost, half of years before
- September 71 year in 10 before August 22; 9 in 10 before September 19
NOAA puts the median frost-free season at 101 days, and the season without a hard freeze (28°F) at 120 days.
A hard freeze (28°F) comes after May 18 in half of springs and before September 16 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Redstone in zone 3b in ZIP code 59257, 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 USC00246927; 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 Redstone?
In a normal year in Redstone, 23 days a year reach 90°F (1 of them 100°F or more), 209 nights fall to 32°F or colder and 51 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
- 209a normal year
- Days that stay below freezing
- 77high of 32°F or less
- Days with 0.01 inch of precipitation
- 51a normal year
The highest temperature in this station's record (since 1951) is 110°F, on July 24, 2007; the lowest is −52°F, on December 23, 1983.
The wettest calendar year on that record is 1978, with 18.40 in; the snowiest season is 1998–99, with 60.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00246927; records: ACIS (NOAA Regional Climate Centers), station USC00246927. Records use complete months only; a month missing more than three days is left out.
How sunny is Redstone?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Redstone, 4.0 kWh per square metre a day. July is the sunniest month (86%) and December the cloudiest (70%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 80% | 1.6 |
| February | 83% | 2.8 |
| March | 77% | 3.9 |
| April | 73% | 4.9 |
| May | 74% | 5.9 |
| June | 77% | 6.5 |
| July | 86% | 6.8 |
| August | 83% | 5.6 |
| September | 78% | 4.1 |
| October | 73% | 2.6 |
| November | 72% | 1.6 |
| 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 Redstone need?
A normal year in Redstone brings 9,465 heating degree days, 76% more than the median U.S. place (5,373), and 265 cooling degree days, 71% 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 1,725 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,668 | 0 |
| February | 1,398 | 0 |
| March | 1,173 | 0 |
| April | 728 | 0 |
| May | 411 | 7 |
| June | 158 | 36 |
| July | 59 | 111 |
| August | 81 | 96 |
| September | 312 | 15 |
| October | 740 | 0 |
| November | 1,170 | 0 |
| December | 1,568 | 0 |
| Year (annual) | 9,465 | 265 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00246927. 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 Redstone's climate compare?
Redstone is warmer than 14 of the other 140 places with their own NOAA record in Montana, and wetter than 52. Across the 7,247 U.S. stations with normals, its annual mean of 39.7°F is warmer than 5%.
In the Köppen classification computed from these normals, Redstone 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 Redstone share this climate record?
3 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.
- Outlook, MT80 people · 9 mi NE
- Flaxville, MT59 people · 11 mi W
- Whitetail, MT8 people · 11 mi NW
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 Redstone's climate
What is the coldest month in Redstone?
January, with a normal high of 24°F and a normal low of −1°F. The warmest is July (82°F by day, 51°F at night).
Does it snow in Redstone?
Yes. NOAA publishes no 1991-2020 snowfall normal for Redstone's NOAA station; the nearest record that keeps one, Raymond Border Station (21 miles away), records 31 inches of snow in a normal year.
What is the rainiest month in Redstone?
June, with 3.08 in of precipitation in a normal year; the driest is February with 0.24 in.
What plant hardiness zone is Redstone in?
The USDA's 2023 map puts Redstone in zone 3b in ZIP code 59257, the nearest ZIP area.
How late can frost come in Redstone?
In half of years the last 32°F night comes after May 28; in one year in ten it comes after June 13. Waiting until June 13 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Montana climateThe statewide normals and every place in the state
- Plentywood, MT17 miles from this station, 39.4°F a year
- Raymond Border Station, MT21 miles from this station, 40.6°F a year
- Scobey, MT24 miles from this station, 40.2°F a year
- Wolf Point (34 mi NE), MT26 miles from this station, 41.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made