Del Bonita, Montana climate: Climate normals at a NOAA weather station
Del Bonita's normal year runs from 11°F January nights to 76°F July afternoons, with 13.1 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 4.5°C, January lows of −12°C, July highs of 24°C, 332 mm of precipitation a year.
- NOAA stationDel Bonita
- Station IDUSC00242301
- Location49.00°N 112.79°W
- Elevation4,337 ft (1,322 m)
On October 23, the normal high in Del Bonita is 49°F and the normal low 27°F, and the chance of measurable rain or snow is 13%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Del Bonita.
- Jan 30° 11°
- Feb 31° 13°
- Mar 39° 19°
- Apr 50° 27°
- May 61° 36°
- Jun 67° 44°
- Jul 76° 49°
- Aug 76° 47°
- Sep 67° 40°
- Oct 53° 30°
- Nov 37° 20°
- Dec 30° 12°
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 Del Bonita each month?
July is the warmest month, with normal highs of 76°F; January the coldest, with normal lows of 11°F. The most precipitation falls in June (2.95 in), the least in January (0.29 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 30°F | 11°F | 20.2°F | 0.29 | 4 | <1 | 30 | 8 h 40 min |
| February | 31°F | 13°F | 21.9°F | 0.51 | 4 | <1 | 27 | 10 h 10 min |
| March | 39°F | 19°F | 28.8°F | 0.47 | 5 | <1 | 28 | 11 h 50 min |
| April | 50°F | 27°F | 38.6°F | 0.91 | 6 | <1 | 22 | 13 h 40 min |
| May | 61°F | 36°F | 48.6°F | 1.98 | 7 | <1 | 10 | 15 h 10 min |
| June | 67°F | 44°F | 55.6°F | 2.95 | 8 | <1 | 1 | 16 h 10 min |
| July | 76°F | 49°F | 62.4°F | 1.49 | 6 | 3 | <1 | 15 h 50 min |
| August | 76°F | 47°F | 61.4°F | 1.12 | 6 | 2 | <1 | 14 h 30 min |
| September | 67°F | 40°F | 53.5°F | 1.46 | 5 | 1 | 5 | 12 h 40 min |
| October | 53°F | 30°F | 41.1°F | 0.76 | 4 | <1 | 19 | 10 h 50 min |
| November | 37°F | 20°F | 28.4°F | 0.61 | 5 | <1 | 26 | 9 h 10 min |
| December | 30°F | 12°F | 21.0°F | 0.51 | 5 | <1 | 30 | 8 h 20 min |
| Year (annual) | 51°F | 29°F | 40.1°F | 13.06 | 65 | 6 | 198 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −1°C | −12°C | −6.6°C | 7 mm |
| February | 0°C | −11°C | −5.6°C | 13 mm |
| March | 4°C | −7°C | −1.8°C | 12 mm |
| April | 10°C | −3°C | 3.7°C | 23 mm |
| May | 16°C | 2°C | 9.2°C | 50 mm |
| June | 20°C | 7°C | 13.1°C | 75 mm |
| July | 24°C | 9°C | 16.9°C | 38 mm |
| August | 24°C | 8°C | 16.3°C | 28 mm |
| September | 19°C | 5°C | 11.9°C | 37 mm |
| October | 11°C | −1°C | 5.1°C | 19 mm |
| November | 3°C | −7°C | −2.0°C | 15 mm |
| December | −1°C | −11°C | −6.1°C | 13 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 USC00242301; 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 Del Bonita?
Normal highs sit between 65°F and 85°F in June, July, August 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 USC00242301.
When is the last frost at Del Bonita?
In Del Bonita, the last spring frost (32°F) comes after May 28 in half of years and after June 12 in one year in ten; the first autumn frost comes before September 16 in half of years and before August 28 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 12; 9 in 10 after May 12
- First autumn frost, half of years before
- September 161 year in 10 before August 28; 9 in 10 before September 28
NOAA puts the median frost-free season at 110 days, and the season without a hard freeze (28°F) at 137 days.
A hard freeze (28°F) comes after May 13 in half of springs and before September 27 in half of autumns.
Frost dates for every NOAA station in Montana · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00242301. 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 Del Bonita?
In a normal year in Del Bonita, 6 days a year reach 90°F, 198 nights fall to 32°F or colder and 65 days bring measurable precipitation.
- Days at 90°F or more
- 6a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 198a normal year
- Days that stay below freezing
- 53high of 32°F or less
- Days with 0.01 inch of precipitation
- 65a normal year
The highest temperature in this station's record (since 1960) is 100°F, on August 5, 1961; the lowest is −48°F, on December 30, 1968.
The wettest calendar year on that record is 1975, with 25.88 in; the snowiest season is 1995–96, with 145.7 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00242301; records: ACIS (NOAA Regional Climate Centers), station USC00242301. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Del Bonita?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds at Del Bonita, 3.8 kWh per square metre a day. July is the sunniest month (86%) and December the cloudiest (62%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 65% | 1.3 |
| February | 73% | 2.4 |
| March | 68% | 3.5 |
| April | 68% | 4.7 |
| May | 69% | 5.6 |
| June | 73% | 6.3 |
| July | 86% | 7.1 |
| August | 82% | 5.8 |
| September | 76% | 4.1 |
| October | 69% | 2.5 |
| November | 62% | 1.4 |
| December | 62% | 1.0 |
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 Del Bonita record?
A normal year at Del Bonita brings 9,137 heating degree days, 70% more than the median U.S. place (5,373), and 99 cooling degree days, 89% 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 1,228 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,390 | 0 |
| February | 1,207 | 0 |
| March | 1,121 | 0 |
| April | 792 | 0 |
| May | 510 | 2 |
| June | 287 | 5 |
| July | 128 | 47 |
| August | 149 | 38 |
| September | 353 | 7 |
| October | 740 | 1 |
| November | 1,097 | 0 |
| December | 1,364 | 0 |
| Year (annual) | 9,137 | 99 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00242301. 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 Del Bonita's climate compare?
Del Bonita is warmer than 15 of the 141 places with their own NOAA record in Montana, and wetter than 33. Across the 7,247 U.S. stations with normals, its annual mean of 40.1°F is warmer than 6%.
In the Köppen classification computed from these normals, Del Bonita 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 Del Bonita share this climate record?
2 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.
- Glendale Colony, MT54 people · 16 mi SE
- Big Sky Colony, MT0 people · 11 mi S
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 Del Bonita's climate
What is the coldest month at Del Bonita?
January, with a normal high of 30°F and a normal low of 11°F. The warmest is July (76°F by day, 49°F at night).
What is the rainiest month at Del Bonita?
June, with 2.95 in of precipitation in a normal year; the driest is January with 0.29 in.
How late can frost come at Del Bonita?
In half of years the last 32°F night comes after May 28; in one year in ten it comes after June 12. Waiting until June 12 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Montana climateThe statewide normals and every place in the state
- Cut Bank, MT33 miles from this station, 41.8°F a year
- St. Mary, MT34 miles from this station, 39.5°F a year
- Sweetgrass, MT37 miles from this station, 43.5°F a year
- East Glacier, MT43 miles from this station, 38.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made