Mosby, MT Climate: Temperature & Rain by Month
Explore NOAA NCEI's 1991–2020 climate normals → and a clearly labeled PlainClimate comfort calculation
30-year climate normals (1991-2020) from Mosby's primary NOAA station, MOSBY 4 ENE.
The climate verdict for Mosby
Dryness leads the climate profile for Mosby, Montana, with 14.5 inches of precipitation a year. NOAA records an annual average of 48°F. At 52/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 24% of scores.
- 48°F
- annual average temperature (NOAA normal)
- 52/100
- comfort score, above 24% of station-mapped location scores
- 14.5"
- precipitation, annual total
- 152 days
- frost-free growing season
Mosby: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00245872 · Mosby, MT 48°F mean · 14.5" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-DRY · SWING-WIDE · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 48°F
- RANK-COOL #2,196
- PHOTO-FINISH ≈ Winterset
- PRCP-DRY 14.5"
- SWING-WIDE 49°F
- COMF-LOW 52/100
- LOAD-HEAT 6,864 HDD
- STN-1 USC00245872
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Winterset, IA (+ 0 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every MT station list.
- Mosby (this station) 48°F
- Cold Broken Bow, NE 48°F
- Hot Winterset, IA 48°F
- Near Fort Robinson, NE 48°F
- Near Boscobel, WI 48°F
Mosby sits in Montana, the #6 coldest U.S. state at 43.4°F statewide annual average - see all 50 coldest states ranked by NOAA normals
Climate Living Index · Mosby
Mosby: 30/100 · grade F
Mosby publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Mosby, not an official NOAA rating. Rankings still use Comfort Score 52/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 169 calendar days | 33/100 · F |
| Annual temperature balance | 48.1°F · 19.4° from 67.5°F | 32/100 · F |
| Frost-free season | 152 days/year | 27/100 · F |
| Precipitation balance | 14.5 in · 20.5 from 35 in | 26/100 · F |
Mosby · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Mosby's normals sit in a dry climate class: BSk
Precipitation is low relative to temperature but above true desert thresholds: cold semi-arid steppe (BSk). Class BSk is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: dry (arid or semi-arid), specifically cold semi-arid steppe.
- Köppen code
- BSk
- Group
- Dry (arid or semi-arid)
- Warmest month
- 73.7°F
- Coldest month
- 24.3°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where Mosby sits across the climate record
Three NOAA fields for Mosby's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 32nd percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Drier than 84%
- Mosby's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- Wider than 79%
- Warmest-to-coldest month gap for Mosby is large versus 6,861 complete station-years.
How Mosby compares across U.S. station-mapped locations
Mosby's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
52 24th percentile score exceeds 24% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). This entry sits in this band.
- 60–70: 1,236 station-mapped locations (20%). Above this entry.
- 70–80: 650 station-mapped locations (11%). Above this entry.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Mosby's measured station temperature trend
MethodologyAcross 36 complete annual observations from 1960 to 2018, MOSBY 4 ENE warmed at a fitted rate of 0.18°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Mosby primary station fitted change +0.18 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 34°F (1°C) | 14°F (-10°C) | 24°F (-4°C) | 0.4" | 29.2 | 0.0 |
| February | 38°F (3°C) | 17°F (-8°C) | 28°F (-2°C) | 0.4" | 25.8 | 0.0 |
| March | 49°F (9°C) | 26°F (-3°C) | 37°F (3°C) | 0.6" | 24.3 | 0.0 |
| April | 59°F (15°C) | 35°F (2°C) | 47°F (8°C) | 1.3" | 13.1 | 0.0 |
| May | 68°F (20°C) | 44°F (7°C) | 56°F (13°C) | 2.6" | 3.1 | 0.3 |
| June | 78°F (25°C) | 53°F (12°C) | 65°F (18°C) | 2.9" | 0.1 | 2.9 |
| July | 88°F (31°C) | 60°F (15°C) | 74°F (23°C) | 1.9" | 0.1 | 13.8 |
| August | 87°F (31°C) | 58°F (14°C) | 72°F (22°C) | 1.2" | 0.0 | 14.4 |
| September | 76°F (24°C) | 48°F (9°C) | 62°F (17°C) | 1.2" | 1.5 | 3.7 |
| October | 60°F (16°C) | 37°F (3°C) | 49°F (9°C) | 1.2" | 10.5 | 0.3 |
| November | 46°F (8°C) | 25°F (-4°C) | 36°F (2°C) | 0.5" | 22.6 | 0.0 |
| December | 37°F (3°C) | 17°F (-8°C) | 27°F (-3°C) | 0.4" | 28.4 | 0.0 |
The year, day by day
Mosby works both ends of the calendar. Normal highs climb to 90°F by July 27 and hold at or above 90°F on 10 dates, then normal lows drop to freezing or below on 159 dates, bottoming at 14°F around January 7.
When the heat sits
Normal highs reach 90°F from July 24 through August 2, covering 10 dates. The broader mild season, normal highs of 70°F or more, runs May 23 to September 27.
This counts calendar dates whose 1991–2020 normal high reaches 90°F. It is a smaller number than the 90°F+ day counts in the monthly table above, which measure how often the threshold was actually crossed in a typical year. A date can average 88°F and still exceed 90°F in half of all years.
The freezing stretch
The normal low stays at or below 32°F into April 3, then returns to freezing around October 28, covering 159 dates in all.
Derived from the normal daily minimum. This is a different measure from the 50%-probability frost dates shown elsewhere on this page, which come from NOAA’s frost product.
Where the wet dates fall
The likeliest wet date is June 3, when 31% of years recorded at least a hundredth of an inch. The driest is November 30 at 9%. Summed across the calendar, that is about 58 wet dates a year.
The widest day
July 30 carries the biggest normal gap between afternoon and dawn, 29°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Mosby.
Where Mosby Stands Nationally
A drier-than-most normal water year — around 15 inches, below what four out of five ranked stations collect.
Mosby earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall
4.1 days with precipitation
3.4 days with precipitation
4.1 days with precipitation
5.4 days with precipitation
8.0 days with precipitation
8.6 days with precipitation
4.7 days with precipitation
3.8 days with precipitation
4.5 days with precipitation
4.2 days with precipitation
2.9 days with precipitation
3.2 days with precipitation
Mosby runs a summer-peaked wet season
41% of Mosby's yearly precipitation falls in June, July and August alone, against the 25% an evenly spread year would give those three months. The wettest month is June at 2.9", on a wide 49.4°F gap between its warmest and coldest month. Warm-season convection and, across the Southwest, the North American monsoon produce this shape: rain arrives in short heavy bursts during the hottest part of the year rather than as long cool-season soaking.
- Wettest three months: June, May, July, taking 51% of the annual total between them.
- Driest month: December at 0.4".
- Winter share: 8% falls in December, January and February.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A summer-peaked label means the June-August share reaches 35%; it describes timing across an average year, not any single season, and says nothing about how heavy an individual storm can be.
How Mosby's precipitation splits across the calendar
About 57 days a year record measurable precipitation here, carrying 14.5" between them, or roughly 0.25 inches on a typical wet day. That sits in the middle band: neither the many-light-days pattern of the Pacific Northwest and the Great Lakes, nor the few-heavy-events pattern of the Gulf and the desert Southwest.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year and say nothing about the heaviest single storm on record.
Frost Dates & Growing Season
First Fall Freeze
October 4
50% probability date
Last Spring Freeze
May 5
50% probability date
Growing Season
152 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,864
Higher = more heating needed
Cooling Degree Days
724
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside MT closest to Mosby on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (48°F here).
- Boone, IA 48°F · 0.0°F off
- Castleford, ID 48°F · 0.0°F off
- Concord, NE 48°F · 0.0°F off
- Crofton, NE 48°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (14.5" here), excluding temperature-peer places.
- Cliff, NM 14.5" · 0.0" off
- Douglas, WY 14.5" · 0.0" off
- Northglenn, CO 14.5" · 0.0" off
- Denver, CO 14.5" · 0.0" off
Scarce-water calendar
Where Mosby's limited precipitation lands
heating led · dry · mid swing
Mosby's energy balance leans toward cold weather: 6,864 annual heating degree days against 724 for cooling. Its 49.4°F seasonal range still makes the monthly rows more useful than the annual average alone.
Mosby's frost-free season lasts about 152 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
July and January mark the typical warm and cold ends of the calendar in Mosby's middle-range seasonal profile. The measured spread is 49.4°F. The annual average is 48°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Mosby's cold-season load does not imply a wet climate. Annual precipitation is 14.5 inches, which places the station in PlainClimate's dry range. Snowfall is not added to the interpretation because its annual value is missing. The snowfall and rainfall fields should be read separately rather than inferred from temperature.
Mosby wettest normal
June
June concentrates the scarce annual total (14.5 inches).
Mosby driest normal
February
February is typically driest; arid stations are defined by when water is absent, not by a four-season grid.
Questions about Mosby's climate
How dry is Mosby? ▼
How many days above 90°F does Mosby get? ▼
How much energy does heating and cooling require in Mosby? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Mosby's primary station: MOSBY 4 ENE (USC00245872). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for Mosby; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for Mosby comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.