Cohagen, Montana climate: Climate normals at a NOAA weather station
Cohagen's normal year runs from 7°F January nights to 86°F July afternoons, with 12.3 inches of precipitation and 25 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 6.4°C, January lows of −14°C, July highs of 30°C, 313 mm of precipitation a year.
- NOAA stationCohagen
- Station IDUSC00241875
- Location47.06°N 106.62°W
- Elevation2,720 ft (829 m)
On October 22, the normal high in Cohagen is 55°F and the normal low 28°F, and the chance of measurable rain or snow is 17%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Cohagen.
- Jan 31° 7°
- Feb 34° 10°
- Mar 46° 19°
- Apr 57° 29°
- May 67° 39°
- Jun 76° 48°
- Jul 86° 54°
- Aug 85° 52°
- Sep 74° 42°
- Oct 58° 30°
- Nov 44° 18°
- Dec 33° 9°
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 Cohagen each month?
July is the warmest month, with normal highs of 86°F; January the coldest, with normal lows of 7°F. The most precipitation falls in May (2.33 in), the least in February (0.28 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 31°F | 7°F | 18.7°F | 0.31 | 5.2 | 4 | <1 | 30 | 8 h 50 min |
| February | 34°F | 10°F | 21.9°F | 0.28 | 3.8 | 4 | <1 | 27 | 10 h 20 min |
| March | 46°F | 19°F | 32.8°F | 0.42 | 3.4 | 5 | <1 | 27 | 11 h 50 min |
| April | 57°F | 29°F | 42.9°F | 1.11 | 2.1 | 6 | <1 | 18 | 13 h 30 min |
| May | 67°F | 39°F | 52.6°F | 2.33 | 0.6 | 9 | <1 | 7 | 15 h |
| June | 76°F | 48°F | 61.9°F | 2.27 | 0.0 | 9 | 3 | <1 | 15 h 50 min |
| July | 86°F | 54°F | 69.8°F | 1.61 | 0.0 | 7 | 13 | <1 | 15 h 30 min |
| August | 85°F | 52°F | 68.4°F | 1.12 | 0.0 | 5 | 12 | <1 | 14 h 20 min |
| September | 74°F | 42°F | 57.7°F | 1.12 | 0.0 | 5 | 3 | 3 | 12 h 40 min |
| October | 58°F | 30°F | 44.3°F | 1.06 | 1.2 | 6 | <1 | 16 | 11 h |
| November | 44°F | 18°F | 30.9°F | 0.40 | 3.1 | 4 | <1 | 27 | 9 h 20 min |
| December | 33°F | 9°F | 20.9°F | 0.31 | 5.2 | 3 | <1 | 30 | 8 h 30 min |
| Year (annual) | 58°F | 30°F | 43.6°F | 12.34 | 24.6 | 68 | 32 | 185 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −1°C | −14°C | −7.4°C | 8 mm | 13 cm |
| February | 1°C | −12°C | −5.6°C | 7 mm | 10 cm |
| March | 8°C | −7°C | 0.4°C | 11 mm | 9 cm |
| April | 14°C | −2°C | 6.1°C | 28 mm | 5 cm |
| May | 19°C | 4°C | 11.4°C | 59 mm | 2 cm |
| June | 24°C | 9°C | 16.6°C | 58 mm | 0 cm |
| July | 30°C | 12°C | 21.0°C | 41 mm | 0 cm |
| August | 30°C | 11°C | 20.2°C | 28 mm | 0 cm |
| September | 23°C | 5°C | 14.3°C | 28 mm | 0 cm |
| October | 15°C | −1°C | 6.8°C | 27 mm | 3 cm |
| November | 7°C | −8°C | −0.6°C | 10 mm | 8 cm |
| December | 0°C | −13°C | −6.2°C | 8 mm | 13 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00241875; 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 Cohagen?
Normal highs sit between 65°F and 85°F in May, June 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 USC00241875.
When is the last frost at Cohagen?
In Cohagen, the last spring frost (32°F) comes after May 25 in half of years and after June 9 in one year in ten; the first autumn frost comes before September 14 in half of years and before August 31 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 251 year in 10 after June 9; 9 in 10 after May 12
- First autumn frost, half of years before
- September 141 year in 10 before August 31; 9 in 10 before September 26
NOAA puts the median frost-free season at 110 days, and the season without a hard freeze (28°F) at 130 days.
A hard freeze (28°F) comes after May 16 in half of springs and before September 23 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Cohagen in zone 4a in ZIP code 59322, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 3b: the coldest night of a typical year reaches −31°F (27 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Montana · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00241875; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. 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 Cohagen?
In a normal year in Cohagen, 32 days a year reach 90°F (3 of them 100°F or more), 185 nights fall to 32°F or colder and 68 days bring measurable precipitation.
- Days at 90°F or more
- 32a normal year
- Days at 100°F or more
- 3a normal year
- Nights at 32°F or colder
- 185a normal year
- Days that stay below freezing
- 48high of 32°F or less
- Days with 0.01 inch of precipitation
- 68a normal year
- Days with 1 inch of snow or more
- 10a normal year
The highest temperature in this station's record (since 1967) is 114°F, on July 12, 2026; the lowest is −46°F, on December 22, 1989.
The wettest calendar year on that record is 1978, with 18.95 in; the snowiest season is 1978–79, with 64.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00241875; records: ACIS (NOAA Regional Climate Centers), station USC00241875. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Cohagen?
Over a year 77% of the sunlight that would reach the ground under clear skies gets through the clouds at Cohagen, 4.0 kWh per square metre a day. July is the sunniest month (88%) and December the cloudiest (64%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 68% | 1.4 |
| February | 72% | 2.4 |
| March | 70% | 3.6 |
| April | 72% | 4.9 |
| May | 74% | 6.0 |
| June | 79% | 6.7 |
| July | 88% | 7.1 |
| August | 86% | 5.9 |
| September | 79% | 4.3 |
| October | 74% | 2.8 |
| November | 71% | 1.7 |
| December | 64% | 1.1 |
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 Cohagen record?
A normal year at Cohagen brings 8,181 heating degree days, 52% more than the median U.S. place (5,373), and 408 cooling degree days, 55% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,046 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,434 | 0 |
| February | 1,205 | 0 |
| March | 1,000 | 0 |
| April | 665 | 0 |
| May | 390 | 5 |
| June | 135 | 43 |
| July | 29 | 177 |
| August | 49 | 155 |
| September | 246 | 26 |
| October | 643 | 1 |
| November | 1,022 | 0 |
| December | 1,365 | 0 |
| Year (annual) | 8,181 | 408 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00241875. 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 Cohagen been warmer than normal?
2025 averaged 47.4°F, 3.8°F above the 1991-2020 normal of 43.6°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 47.3°F | +3.7°F | 7.66 | 25.7 |
| 2022 | 45.3°F | +1.7°F | 10.07 | 28.7 |
| 2023 | 48.3°F | +4.7°F | 16.57 | 20.8 |
| 2024 | 48.0°F | +4.4°F | 12.23 | 21.6 |
| 2025 | 47.4°F | +3.8°F | 14.52 | 29.4 |
Over 48 complete years from 1969 to 2025, the station's annual mean temperature rose at a fitted 5.1°F per century (+0.28°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00241875; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Cohagen's climate compare?
Cohagen is warmer than 63 of the 141 places with their own NOAA record in Montana, and wetter than 21. Across the 7,247 U.S. stations with normals, its annual mean of 43.6°F is warmer than 14%.
In the Köppen classification computed from these normals, Cohagen 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.
Questions about Cohagen's climate
What is the coldest month at Cohagen?
January, with a normal high of 31°F and a normal low of 7°F. The warmest is July (86°F by day, 54°F at night).
Does it snow at Cohagen?
Yes: 25 inches in a normal year, falling on 13 days with 0.1 inch or more, the most in January (5.2 inches).
What is the rainiest month at Cohagen?
May, with 2.33 in of precipitation in a normal year; the driest is February with 0.28 in.
What plant hardiness zone is Cohagen in?
The USDA's 2023 map puts Cohagen in zone 4a in ZIP code 59322, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −31°F (27 years, 1991-2020): zone 3b.
How late can frost come at Cohagen?
In half of years the last 32°F night comes after May 25; in one year in ten it comes after June 9. Waiting until June 9 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Montana climateThe statewide normals and every place in the state
- Rock Springs, MT24 miles from this station, 44.3°F a year
- Jordan, MT24 miles from this station, 44.2°F a year
- Brockway, MT40 miles from this station, 44.0°F a year
- Ingomar (9 mi E), MT43 miles from this station, 44.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made