Del Bonita, 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 Del Bonita's primary NOAA station, DEL BONITA.
The climate verdict for Del Bonita
Dryness leads the climate profile for Del Bonita, Montana, with 13.1 inches of precipitation a year. NOAA records an annual average of 40°F. At 40/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 6% of scores.
- 40°F
- yearly average temperature, NOAA normal
- 40/100
- comfort score, above 6% of station-mapped location scores
- 13.1"
- yearly precipitation total
- 111 days
- frost-free growing season
Del Bonita: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00242301 · Del Bonita, MT 40°F mean · 13.1" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-DRY · SWING-MID · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 40°F
- RANK-COOL #343
- PHOTO-FINISH ≈ Elliston
- PRCP-DRY 13.1"
- SWING-MID 42°F
- COMF-LOW 40/100
- LOAD-HEAT 9,137 HDD
- STN-1 USC00242301
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Elliston, MT (+ 0.2 °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.
- Del Bonita (this station) 40°F
- Cold Coal Creek Cany…, CO 40°F
- Hot Paradise, MI 40°F
- Near Elliston, MT 40°F
- Near Austin, MT 40°F
Del Bonita 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 · Del Bonita
Del Bonita: 10/100 · grade F
Del Bonita publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Del Bonita, not an official NOAA rating. Rankings still use Comfort Score 40/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 13.1 in · 21.9 from 35 in | 22/100 · F |
| Normal heat + freeze calendar | 206 calendar days | 11/100 · F |
| Annual temperature balance | 40.1°F · 27.4° from 67.5°F | 5/100 · F |
| Frost-free season | 111 days/year | 3/100 · F |
Del Bonita · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Del Bonita'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
- 62.4°F
- Coldest month
- 20.2°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 Del Bonita sits across the climate record
Three NOAA fields for Del Bonita's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 95%
- Among 6,861 stations, Del Bonita sits in the cooler third of annual means.
- Annual precipitation
- Drier than 87%
- Del Bonita's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- 45th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Del Bonita compares across U.S. station-mapped locations
Del Bonita's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
40 6th percentile score exceeds 6% 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%). This entry sits in this band.
- 50–60: 1,329 station-mapped locations (21%). Above this entry.
- 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
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 30°F (-1°C) | 11°F (-12°C) | 20°F (-7°C) | 0.3" | 29.6 | 0.0 |
| February | 31°F (0°C) | 13°F (-11°C) | 22°F (-6°C) | 0.5" | 26.6 | 0.0 |
| March | 39°F (4°C) | 19°F (-7°C) | 29°F (-2°C) | 0.5" | 28.0 | 0.0 |
| April | 50°F (10°C) | 27°F (-3°C) | 39°F (4°C) | 0.9" | 22.3 | 0.0 |
| May | 61°F (16°C) | 36°F (2°C) | 49°F (9°C) | 2.0" | 10.4 | 0.0 |
| June | 67°F (20°C) | 44°F (7°C) | 56°F (13°C) | 3.0" | 0.7 | 0.1 |
| July | 76°F (24°C) | 49°F (9°C) | 62°F (17°C) | 1.5" | 0.1 | 3.2 |
| August | 76°F (24°C) | 47°F (8°C) | 61°F (16°C) | 1.1" | 0.4 | 1.8 |
| September | 67°F (19°C) | 40°F (5°C) | 54°F (12°C) | 1.5" | 4.6 | 0.5 |
| October | 53°F (11°C) | 30°F (-1°C) | 41°F (5°C) | 0.8" | 18.7 | 0.0 |
| November | 37°F (3°C) | 20°F (-7°C) | 28°F (-2°C) | 0.6" | 26.4 | 0.0 |
| December | 30°F (-1°C) | 12°F (-11°C) | 21°F (-6°C) | 0.5" | 29.8 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 79°F around July 28, short of 90°F on every date, while 206 dates carry a normal low at or below freezing, the coldest 10°F near January 1.
The freezing stretch
The normal low stays at or below 32°F into May 3, then returns to freezing around October 11, covering 206 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 7, when 28% of years recorded at least a hundredth of an inch. The driest is January 28 at 13%. Summed across the calendar, that is about 65 wet dates a year.
The widest day
August 5 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 Del Bonita.
Where Del Bonita Stands Nationally
Winters bite deep and often: the normal nightly low dips to freezing or below on around 206 nights a year, placing this among the most frost-prone tenth of ranked stations.
A drier-than-most normal water year — around 13 inches, below what four out of five ranked stations collect.
Del Bonita earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall
4.2 days with precipitation
4.2 days with precipitation
4.5 days with precipitation
6.0 days with precipitation
7.0 days with precipitation
8.3 days with precipitation
6.1 days with precipitation
5.7 days with precipitation
5.3 days with precipitation
4.2 days with precipitation
4.7 days with precipitation
5.0 days with precipitation
Del Bonita runs a summer-peaked wet season
43% of Del Bonita'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 3.0", on a 42.2°F seasonal spread. 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 49% of the annual total between them.
- Driest month: January at 0.3".
- Winter share: 10% 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 Del Bonita's precipitation splits across the calendar
About 65 days a year record measurable precipitation here, carrying 13.1" between them, or roughly 0.20 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 16
50% probability date
Last Spring Freeze
May 28
50% probability date
Growing Season
111 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
9,137
Higher = more heating needed
Cooling Degree Days
99
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside MT closest to Del Bonita 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 (40°F here).
- Detroit Lakes, MN 40°F · 0.0°F off
- Gustavus, AK 40°F · 0.0°F off
- Homer, AK 40°F · 0.0°F off
- Long Prairie, MN 40°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (13.1" here), excluding temperature-peer places.
- Manti, UT 13.1" · 0.0" off
- Heppner, OR 13.1" · 0.0" off
- Laramie, WY 13.1" · 0.0" off
- Malad City, ID 13.1" · 0.0" off
Scarce-water calendar
Where Del Bonita's limited precipitation lands
heating led · dry · mid swing
Del Bonita's energy balance leans toward cold weather: 9,137 annual heating degree days against 99 for cooling. Its 42.2°F seasonal range still makes the monthly rows more useful than the annual average alone.
Only about 111 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 Del Bonita's middle-range seasonal profile. The measured spread is 42.2°F. The annual average is 40°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Del Bonita's cold-season load does not imply a wet climate. Annual precipitation is 13.1 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.
Del Bonita wettest normal
June
June concentrates the scarce annual total (13.1 inches).
Del Bonita driest normal
January
January is typically driest; arid stations are defined by when water is absent, not by a four-season grid.
Questions about Del Bonita's climate
How dry is Del Bonita? ▼
How cold does Del Bonita get in winter? ▼
How much energy does heating and cooling require in Del Bonita? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Del Bonita's primary station: DEL BONITA (USC00242301). 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 Del Bonita; 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 Del Bonita 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.