Mosby (4 mi ENE), Montana climate: Climate normals at a NOAA weather station
Mosby (4 mi ENE)'s normal year runs from 14°F January nights to 88°F July afternoons, with 14.5 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.9°C, January lows of −10°C, July highs of 31°C, 368 mm of precipitation a year.
- NOAA stationMosby (4 mi ENE)
- Station IDUSC00245872
- Location47.02°N 107.82°W
- Elevation2,910 ft (887 m)
On October 23, the normal high in Mosby (4 mi ENE) is 57°F and the normal low 34°F, and the chance of measurable rain or snow is 12%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Mosby (4 mi ENE).
- Jan 34° 14°
- Feb 38° 17°
- Mar 49° 26°
- Apr 59° 35°
- May 68° 44°
- Jun 78° 53°
- Jul 88° 60°
- Aug 87° 58°
- Sep 76° 48°
- Oct 60° 37°
- Nov 46° 25°
- Dec 37° 17°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Mosby (4 mi ENE) each month?
July is the warmest month, with normal highs of 88°F; January the coldest, with normal lows of 14°F. The most precipitation falls in June (2.85 in), the least in February (0.39 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 34°F | 14°F | 24.3°F | 0.43 | 4 | <1 | 29 | 8 h 50 min |
| February | 38°F | 17°F | 27.5°F | 0.39 | 3 | <1 | 26 | 10 h 20 min |
| March | 49°F | 26°F | 37.3°F | 0.56 | 4 | <1 | 24 | 11 h 50 min |
| April | 59°F | 35°F | 46.8°F | 1.33 | 5 | <1 | 13 | 13 h 30 min |
| May | 68°F | 44°F | 56.0°F | 2.63 | 8 | <1 | 3 | 15 h |
| June | 78°F | 53°F | 65.2°F | 2.85 | 9 | 3 | <1 | 15 h 50 min |
| July | 88°F | 60°F | 73.7°F | 1.87 | 5 | 14 | <1 | 15 h 30 min |
| August | 87°F | 58°F | 72.4°F | 1.18 | 4 | 14 | <1 | 14 h 20 min |
| September | 76°F | 48°F | 62.1°F | 1.23 | 5 | 4 | 2 | 12 h 40 min |
| October | 60°F | 37°F | 48.5°F | 1.17 | 4 | <1 | 11 | 11 h |
| November | 46°F | 25°F | 35.9°F | 0.47 | 3 | <1 | 23 | 9 h 20 min |
| December | 37°F | 17°F | 26.9°F | 0.39 | 3 | <1 | 28 | 8 h 30 min |
| Year (annual) | 60°F | 36°F | 48.1°F | 14.50 | 57 | 35 | 159 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 1°C | −10°C | −4.3°C | 11 mm |
| February | 3°C | −8°C | −2.5°C | 10 mm |
| March | 9°C | −3°C | 2.9°C | 14 mm |
| April | 15°C | 2°C | 8.2°C | 34 mm |
| May | 20°C | 7°C | 13.3°C | 67 mm |
| June | 25°C | 12°C | 18.4°C | 72 mm |
| July | 31°C | 15°C | 23.2°C | 47 mm |
| August | 31°C | 14°C | 22.4°C | 30 mm |
| September | 24°C | 9°C | 16.7°C | 31 mm |
| October | 16°C | 3°C | 9.2°C | 30 mm |
| November | 8°C | −4°C | 2.2°C | 12 mm |
| December | 3°C | −8°C | −2.8°C | 10 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 USC00245872; 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.
Which months are mildest at Mosby (4 mi ENE)?
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 USC00245872.
When is the last frost at Mosby (4 mi ENE)?
In Mosby (4 mi ENE), the last spring frost (32°F) comes after May 5 in half of years and after May 26 in one year in ten; the first autumn frost comes before October 4 in half of years and before September 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 51 year in 10 after May 26; 9 in 10 after April 20
- First autumn frost, half of years before
- October 41 year in 10 before September 22; 9 in 10 before October 19
NOAA puts the median frost-free season at 151 days, and the season without a hard freeze (28°F) at 173 days.
A hard freeze (28°F) comes after April 20 in half of springs and before October 14 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Mosby (4 mi ENE) in zone 4b in ZIP code 59058, 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 USC00245872; 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 at Mosby (4 mi ENE)?
In a normal year in Mosby (4 mi ENE), 35 days a year reach 90°F (5 of them 100°F or more), 159 nights fall to 32°F or colder and 57 days bring measurable precipitation.
- Days at 90°F or more
- 35a normal year
- Days at 100°F or more
- 5a normal year
- Nights at 32°F or colder
- 159a normal year
- Days that stay below freezing
- 42high of 32°F or less
- Days with 0.01 inch of precipitation
- 57a normal year
The highest temperature in this station's record (since 1959) is 112°F, on June 19, 1988; the lowest is −43°F, on January 24, 1969.
The wettest calendar year on that record is 2016, with 23.26 in; the snowiest season is 1978–79, with 71.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00245872; records: ACIS (NOAA Regional Climate Centers), station USC00245872. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Mosby (4 mi ENE)?
Over a year 77% of the sunlight that would reach the ground under clear skies gets through the clouds at Mosby (4 mi ENE), 4.0 kWh per square metre a day. July is the sunniest month (88%) and December the cloudiest (64%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 68% | 1.4 |
| February | 72% | 2.4 |
| March | 70% | 3.6 |
| April | 72% | 4.9 |
| May | 74% | 6.0 |
| June | 79% | 6.7 |
| July | 88% | 7.1 |
| August | 86% | 5.9 |
| September | 79% | 4.3 |
| October | 74% | 2.8 |
| November | 71% | 1.7 |
| December | 64% | 1.1 |
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 many heating and cooling degree days does Mosby (4 mi ENE) record?
A normal year at Mosby (4 mi ENE) brings 6,864 heating degree days, 28% more than the median U.S. place (5,373), and 724 cooling degree days, 20% 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 2,704 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,262 | 0 |
| February | 1,048 | 0 |
| March | 859 | 0 |
| April | 548 | 2 |
| May | 297 | 18 |
| June | 83 | 91 |
| July | 12 | 283 |
| August | 24 | 254 |
| September | 157 | 70 |
| October | 520 | 7 |
| November | 873 | 0 |
| December | 1,182 | 0 |
| Year (annual) | 6,864 | 724 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00245872. 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.
Have recent years at Mosby (4 mi ENE) been warmer than normal?
Over 36 complete years from 1960 to 2018, the station's annual mean temperature rose at a fitted 3.2°F per century (+0.18°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Mosby (4 mi ENE)'s climate compare?
Mosby (4 mi ENE) is warmer than 138 of the 141 places with their own NOAA record in Montana, and wetter than 57. Across the 7,247 U.S. stations with normals, its annual mean of 48.1°F is warmer than 32%.
In the Köppen classification computed from these normals, Mosby (4 mi ENE) 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 Mosby (4 mi ENE)'s climate
What is the coldest month at Mosby (4 mi ENE)?
January, with a normal high of 34°F and a normal low of 14°F. The warmest is July (88°F by day, 60°F at night).
What is the rainiest month at Mosby (4 mi ENE)?
June, with 2.85 in of precipitation in a normal year; the driest is February with 0.39 in.
What plant hardiness zone is Mosby (4 mi ENE) in?
The USDA's 2023 map puts Mosby (4 mi ENE) in zone 4b in ZIP code 59058, the nearest ZIP area.
How late can frost come at Mosby (4 mi ENE)?
In half of years the last 32°F night comes after May 5; in one year in ten it comes after May 26. Waiting until May 26 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Montana climateThe statewide normals and every place in the state
- Melstone, MT29 miles from this station, 47.2°F a year
- Flatwillow (4 mi ENE), MT29 miles from this station, 46.5°F a year
- Valentine, MT39 miles from this station, 43.9°F a year
- Ingomar (9 mi E), MT43 miles from this station, 44.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made