Troy, MT Climate: Temperature & Rain by Month
Annual temperature and rainfall from NOAA NCEI's 1991–2020 normals →; comfort score computed by PlainClimate
30-year climate normals (1991-2020) from Troy's primary NOAA station, TROY.
The climate verdict for Troy
Troy, Montana has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 47°F. Its climate comfort score of 64/100 (good) lands mid-pack nationally, exceeding 49% of station-mapped location scores.
- 47°F
- yearly average temperature, NOAA normal
- 64/100
- comfort score, above 49% of station-mapped location scores
- 24.4"
- yearly precipitation total
- 134 days
- frost-free growing season
Troy: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00248390 · Troy, MT 47°F mean · 24.4" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-DRY · SWING-MID · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 47°F
- RANK-COOL #1,784
- PHOTO-FINISH ≈ Garden Valley
- PRCP-DRY 24.4"
- SWING-MID 40°F
- COMF-MID 64/100
- LOAD-HEAT 6,898 HDD
- STN-1 USC00248390
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Garden Valley, ID (+ 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.
- Troy (this station) 47°F
- Cold Kellogg, ID 47°F
- Hot Holter Dam, MT 47°F
- Near Garden Valley, ID 47°F
- Near Alkali Lake, OR 47°F
Troy 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 · Troy
Troy: 36/100 · grade F
Troy publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Troy, not an official NOAA rating. Rankings still use Comfort Score 64/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 24.4 in · 10.6 from 35 in | 63/100 · C |
| Normal heat + freeze calendar | 163 calendar days | 37/100 · F |
| Annual temperature balance | 46.8°F · 20.7° from 67.5°F | 26/100 · F |
| Frost-free season | 134 days/year | 15/100 · F |
Troy · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Troy is a continental Köppen climate: Dsb
Coldest-month mean 27.8°F and warmest-month mean 68.1°F place this station in continental, dry-summer, warm summer climates (Dsb). Class Dsb is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, dry-summer, warm summer.
- Köppen code
- Dsb
- Group
- Continental
- Warmest month
- 68.1°F
- Coldest month
- 27.8°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 Troy sits across the climate record
Three NOAA fields for Troy's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 74%
- Among 6,861 stations, Troy sits in the cooler third of annual means.
- Annual precipitation
- 33rd percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- 37th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Troy compares across U.S. station-mapped locations
Troy's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
64 49th percentile score exceeds 49% 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%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). This entry sits in this band.
- 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
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 33°F (0°C) | 23°F (-5°C) | 28°F (-2°C) | 2.6" | 27.1 | 0.0 |
| February | 39°F (4°C) | 24°F (-5°C) | 31°F (0°C) | 1.9" | 24.2 | 0.0 |
| March | 50°F (10°C) | 28°F (-2°C) | 39°F (4°C) | 2.4" | 22.3 | 0.0 |
| April | 59°F (15°C) | 33°F (1°C) | 46°F (8°C) | 1.6" | 14.5 | 0.0 |
| May | 70°F (21°C) | 40°F (5°C) | 55°F (13°C) | 1.8" | 4.7 | 0.6 |
| June | 76°F (24°C) | 46°F (8°C) | 61°F (16°C) | 2.5" | 0.3 | 3.1 |
| July | 87°F (30°C) | 49°F (10°C) | 68°F (20°C) | 0.9" | 0.0 | 14.7 |
| August | 86°F (30°C) | 48°F (9°C) | 67°F (19°C) | 0.7" | 0.0 | 13.1 |
| September | 75°F (24°C) | 42°F (5°C) | 58°F (15°C) | 1.2" | 2.5 | 2.4 |
| October | 57°F (14°C) | 35°F (1°C) | 46°F (8°C) | 2.4" | 11.1 | 0.0 |
| November | 41°F (5°C) | 29°F (-1°C) | 35°F (2°C) | 3.5" | 18.2 | 0.0 |
| December | 32°F (0°C) | 24°F (-5°C) | 28°F (-2°C) | 2.8" | 26.7 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 90°F around July 27, short of 90°F on every date, while 163 dates carry a normal low at or below freezing, the coldest 22°F near January 1.
The freezing stretch
The normal low stays at or below 32°F into April 9, then returns to freezing around October 30, covering 163 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 November 19, when 45% of years recorded at least a hundredth of an inch. The driest is August 2 at 14%. Summed across the calendar, that is about 115 wet dates a year.
The widest day
July 31 carries the biggest normal gap between afternoon and dawn, 40°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Troy.
Where Troy Stands Nationally
Day-to-night contrast is extreme by national standards — the widest normal daily swing reaches about 40°F, sharper than nine in ten ranked stations see.
Troy 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
13.6 days with precipitation
9.6 days with precipitation
11.2 days with precipitation
8.9 days with precipitation
10.3 days with precipitation
10.5 days with precipitation
4.7 days with precipitation
4.5 days with precipitation
6.4 days with precipitation
9.1 days with precipitation
14.1 days with precipitation
12.6 days with precipitation
Troy spreads its precipitation across the year
Neither half of the year dominates here: June through August take 17% of the annual total and December through February 30%, with neither reaching the 35% that would mark a distinct wet season. Troy has no dry season to plan around, though it does carry a 40.3°F seasonal spread.
The gap between the wettest and driest month still matters: November averages 3.5" and August 0.7". The three wettest months together take 37% of the year, against the 25% a perfectly flat distribution would give them.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. "Spread across the year" means neither the June-August nor the December-February share reaches 35%; it describes an average year, not the variability of any single one.
How Troy's precipitation splits across the calendar
About 115 days a year record measurable precipitation here, carrying 24.4" between them, or roughly 0.21 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
September 25
50% probability date
Last Spring Freeze
May 14
50% probability date
Growing Season
134 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,898
Higher = more heating needed
Cooling Degree Days
288
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside MT closest to Troy 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 (47°F here).
- Chamberlain, SD 47°F · 0.0°F off
- Cody, WY 47°F · 0.0°F off
- Dakota City, IA 47°F · 0.0°F off
- Dodge, WI 47°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (24.4" here), excluding temperature-peer places.
- Clark, SD 24.4" · 0.0" off
- Fargo, ND 24.4" · 0.0" off
- Richmond, CA 24.4" · 0.0" off
- Pickstown, SD 24.4" · 0.0" off
Data-derived climate profile
How Troy's climate pattern fits together
heating led · moderate · mid swing
Troy's energy balance leans toward cold weather: 6,898 annual heating degree days against 288 for cooling. Its 40.3°F seasonal range still makes the monthly rows more useful than the annual average alone.
Only about 134 days are frost-free in a normal year. That short interval is consistent with the cold-season signal, but the measure does not predict the exact first or last freeze in any one year.
July and January mark the typical warm and cold ends of the calendar in Troy's middle-range seasonal profile. The measured spread is 40.3°F. The annual average is 47°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Troy's 24.4 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Snowfall is not added to the interpretation because its annual value is missing. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
These labels group NOAA 1991-2020 normals from Troy's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for Troy, not an official NOAA class or a year-ahead forecast.
Questions about Troy's climate
How much rain does Troy get? ▼
How many days above 90°F does Troy get? ▼
How much energy does heating and cooling require in Troy? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Troy's primary station: TROY (USC00248390). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as an incorporated place (GEOID 3075025). Match rule for Troy: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Troy 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.