Adel, Montana climate: Climate normals at a NOAA weather station
Adel's normal year runs from 15°F December nights to 78°F July afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 5.3°C, December lows of −10°C, July highs of 25°C.
- NOAA stationAdel
- Station IDUSC00240056
- Location47.01°N 111.67°W
- Elevation5,017 ft (1,529 m)
On October 22, the normal high in Adel is 51°F and the normal low 30°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Adel.
- Jan 36° 14°
- Feb 37° 14°
- Mar 43° 21°
- Apr 50° 27°
- May 58° 35°
- Jun 67° 42°
- Jul 78° 47°
- Aug 78° 46°
- Sep 68° 39°
- Oct 53° 31°
- Nov 42° 23°
- Dec 33° 15°
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 Adel each month?
July is the warmest month, with normal highs of 78°F; December the coldest, with normal lows of 15°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 36°F | 14°F | 25.0°F | – | <1 | 29 | 8 h 50 min |
| February | 37°F | 14°F | 25.4°F | – | <1 | 26 | 10 h 20 min |
| March | 43°F | 21°F | 31.8°F | – | <1 | 27 | 11 h 50 min |
| April | 50°F | 27°F | 38.7°F | – | <1 | 23 | 13 h 30 min |
| May | 58°F | 35°F | 46.6°F | – | <1 | 10 | 15 h |
| June | 67°F | 42°F | 54.4°F | – | <1 | 1 | 15 h 50 min |
| July | 78°F | 47°F | 62.3°F | – | 1 | <1 | 15 h 30 min |
| August | 78°F | 46°F | 62.0°F | – | 1 | 1 | 14 h 20 min |
| September | 68°F | 39°F | 53.3°F | – | <1 | 5 | 12 h 40 min |
| October | 53°F | 31°F | 42.4°F | – | <1 | 18 | 11 h |
| November | 42°F | 23°F | 32.2°F | – | <1 | 23 | 9 h 20 min |
| December | 33°F | 15°F | 24.1°F | – | <1 | 27 | 8 h 30 min |
| Year (annual) | 54°F | 30°F | 41.5°F | – | 3 | 191 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | 2°C | −10°C | −3.9°C |
| February | 3°C | −10°C | −3.7°C |
| March | 6°C | −6°C | −0.1°C |
| April | 10°C | −3°C | 3.7°C |
| May | 15°C | 2°C | 8.1°C |
| June | 19°C | 6°C | 12.4°C |
| July | 25°C | 8°C | 16.8°C |
| August | 26°C | 8°C | 16.7°C |
| September | 20°C | 4°C | 11.8°C |
| October | 12°C | 0°C | 5.8°C |
| November | 5°C | −5°C | 0.1°C |
| December | 1°C | −10°C | −4.4°C |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Cascade (20 mi SSE) (5 miles away), gets 63 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00240056; 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 Adel?
Normal highs sit between 65°F and 85°F in June, July, August and September.
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 USC00240056.
When is the last frost at Adel?
In Adel, the last spring frost (32°F) comes after June 4 in half of years and after June 22 in one year in ten; the first autumn frost comes before September 12 in half of years and before August 26 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
- June 41 year in 10 after June 22; 9 in 10 after May 22
- First autumn frost, half of years before
- September 121 year in 10 before August 26; 9 in 10 before September 28
NOAA puts the median frost-free season at 98 days, and the season without a hard freeze (28°F) at 131 days.
A hard freeze (28°F) comes after May 16 in half of springs and before September 27 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Adel in zone 4b in ZIP code 59421, 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 USC00240056; 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 Adel?
In a normal year in Adel, 3 days a year reach 90°F and 191 nights fall to 32°F or colder.
- Days at 90°F or more
- 3a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 191a normal year
- Days that stay below freezing
- 56high of 32°F or less
The highest temperature in this station's record (since 1898) is 106°F, on July 22, 1936; the lowest is −46°F, on December 31, 1927.
The wettest calendar year on that record is 1927, with 43.03 in; the snowiest season is 1922–23, with 177.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00240056; records: ACIS (NOAA Regional Climate Centers), station USC00240056. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Adel?
Over a year 76% of the sunlight that would reach the ground under clear skies gets through the clouds at Adel, 4.0 kWh per square metre a day. July is the sunniest month (87%) and December the cloudiest (66%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 71% | 1.5 |
| February | 73% | 2.5 |
| March | 71% | 3.6 |
| April | 69% | 4.8 |
| May | 71% | 5.8 |
| June | 76% | 6.6 |
| July | 87% | 7.2 |
| August | 85% | 5.9 |
| September | 78% | 4.3 |
| October | 72% | 2.7 |
| November | 68% | 1.6 |
| December | 66% | 1.2 |
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 Adel record?
A normal year at Adel brings 8,627 heating degree days, 61% more than the median U.S. place (5,373), and 82 cooling degree days, 91% fewer than the median (908). Ten months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 1,204 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,242 | 0 |
| February | 1,110 | 0 |
| March | 1,031 | 0 |
| April | 789 | 0 |
| May | 572 | 0 |
| June | 322 | 4 |
| July | 118 | 34 |
| August | 131 | 38 |
| September | 358 | 6 |
| October | 701 | 1 |
| November | 984 | 0 |
| December | 1,269 | 0 |
| Year (annual) | 8,627 | 82 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00240056. 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 Adel been warmer than normal?
2025 averaged 44.1°F, 2.6°F above the 1991-2020 normal of 41.5°F.
| Year | Mean | Against normal |
|---|---|---|
| 2025 | 44.1°F | +2.6°F |
Source: observed years: ACIS, station USC00240056. A year counts only with all twelve months complete.
How does Adel's climate compare?
Adel is warmer than 23 of the 141 places with their own NOAA record in Montana. Across the 7,247 U.S. stations with normals, its annual mean of 41.5°F is warmer than 8%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Questions about Adel's climate
What is the coldest month at Adel?
December, with a normal high of 33°F and a normal low of 15°F. The warmest is July (78°F by day, 47°F at night).
Does it snow at Adel?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Cascade (20 mi SSE) (5 miles away), records 63 inches of snow in a normal year.
What plant hardiness zone is Adel in?
The USDA's 2023 map puts Adel in zone 4b in ZIP code 59421, the nearest ZIP area.
How late can frost come at Adel?
In half of years the last 32°F night comes after June 4; in one year in ten it comes after June 22. Waiting until June 22 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Montana climateThe statewide normals and every place in the state
- Cascade, MT15 miles from this station, 47.0°F a year
- Holter Dam, MT16 miles from this station, 46.8°F a year
- Millegan (14 mi SE), MT26 miles from this station, 40.9°F a year
- Helena, MT31 miles from this station, 45.5°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made