Glen, Montana climate: Normal weather by month, frost dates and records
Glen's normal year runs from 8°F December nights to 86°F July afternoons, with 9.2 inches of precipitation and 10 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 5.8°C, December lows of −14°C, July highs of 30°C, 233 mm of precipitation a year.
- NOAA stationGlen (4 mi N)
- Station IDUSC00243570
- Location45.53°N 112.70°W
- Elevation5,054 ft (1,541 m)
- From the center3 miles
- Population (census place)60
On October 22, the normal high in Glen is 57°F and the normal low 23°F, and the chance of measurable rain or snow is 11%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Glen.
- Jan 37° 8°
- Feb 41° 11°
- Mar 50° 19°
- Apr 58° 26°
- May 68° 33°
- Jun 76° 40°
- Jul 86° 44°
- Aug 85° 41°
- Sep 76° 33°
- Oct 61° 25°
- Nov 45° 15°
- Dec 36° 8°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Glen each month?
July is the warmest month, with normal highs of 86°F; December the coldest, with normal lows of 8°F. The most precipitation falls in May (1.74 in), the least in January (0.24 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 37°F | 8°F | 22.3°F | 0.24 | 2.0 | 3 | <1 | 30 | 9 h |
| February | 41°F | 11°F | 26.1°F | 0.39 | 1.2 | 3 | <1 | 27 | 10 h 20 min |
| March | 50°F | 19°F | 34.7°F | 0.47 | 1.2 | 4 | <1 | 28 | 11 h 50 min |
| April | 58°F | 26°F | 41.6°F | 0.83 | 1.1 | 6 | <1 | 23 | 13 h 30 min |
| May | 68°F | 33°F | 50.2°F | 1.74 | 0.0 | 8 | <1 | 11 | 14 h 50 min |
| June | 76°F | 40°F | 57.7°F | 1.67 | 0.0 | 9 | 2 | 2 | 15 h 40 min |
| July | 86°F | 44°F | 65.0°F | 0.83 | 0.0 | 6 | 11 | <1 | 15 h 20 min |
| August | 85°F | 41°F | 63.1°F | 0.85 | 0.0 | 6 | 8 | 1 | 14 h 10 min |
| September | 76°F | 33°F | 54.5°F | 0.71 | 0.0 | 4 | 1 | 12 | 12 h 40 min |
| October | 61°F | 25°F | 42.6°F | 0.68 | 0.3 | 4 | <1 | 23 | 11 h |
| November | 45°F | 15°F | 30.3°F | 0.46 | 1.8 | 4 | <1 | 27 | 9 h 30 min |
| December | 36°F | 8°F | 21.6°F | 0.31 | 2.5 | 3 | <1 | 30 | 8 h 40 min |
| Year (annual) | 60°F | 25°F | 42.5°F | 9.18 | 10.1 | 58 | 22 | 213 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 3°C | −13°C | −5.4°C | 6 mm | 5 cm |
| February | 5°C | −12°C | −3.3°C | 10 mm | 3 cm |
| March | 10°C | −7°C | 1.5°C | 12 mm | 3 cm |
| April | 14°C | −4°C | 5.3°C | 21 mm | 3 cm |
| May | 20°C | 0°C | 10.1°C | 44 mm | 0 cm |
| June | 24°C | 4°C | 14.3°C | 42 mm | 0 cm |
| July | 30°C | 7°C | 18.3°C | 21 mm | 0 cm |
| August | 29°C | 5°C | 17.3°C | 22 mm | 0 cm |
| September | 24°C | 1°C | 12.5°C | 18 mm | 0 cm |
| October | 16°C | −4°C | 5.9°C | 17 mm | 1 cm |
| November | 7°C | −9°C | −0.9°C | 12 mm | 5 cm |
| December | 2°C | −14°C | −5.8°C | 8 mm | 6 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00243570; 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.
When is the best weather to visit Glen?
Normal highs sit between 65°F and 85°F in May, June, August and September. Of those, September has the fewest days with rain (4).
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 USC00243570.
How hot and how cold does it get in Glen?
In a normal year in Glen, 22 days a year reach 90°F (1 of them 100°F or more), 213 nights fall to 32°F or colder and 58 days bring measurable precipitation.
- Days at 90°F or more
- 22a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 213a normal year
- Days that stay below freezing
- 29high of 32°F or less
- Days with 0.01 inch of precipitation
- 58a normal year
- Days with 1 inch of snow or more
- 5a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00243570.
How sunny is Glen?
Over a year 76% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Glen, 4.2 kWh per square metre a day. July is the sunniest month (85%) and December the cloudiest (65%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 70% | 1.7 |
| February | 73% | 2.8 |
| March | 73% | 4.0 |
| April | 70% | 5.1 |
| May | 70% | 5.9 |
| June | 76% | 6.8 |
| July | 85% | 7.3 |
| August | 84% | 6.2 |
| September | 80% | 4.7 |
| October | 73% | 3.0 |
| November | 68% | 1.9 |
| December | 65% | 1.4 |
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 much heating and cooling does Glen need?
A normal year in Glen brings 8,306 heating degree days, 55% more than the median U.S. place (5,373), and 115 cooling degree days, 87% 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 1,422 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,324 | 0 |
| February | 1,089 | 0 |
| March | 939 | 0 |
| April | 702 | 0 |
| May | 460 | 1 |
| June | 229 | 10 |
| July | 66 | 66 |
| August | 95 | 36 |
| September | 318 | 3 |
| October | 696 | 0 |
| November | 1,043 | 0 |
| December | 1,347 | 0 |
| Year (annual) | 8,306 | 115 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00243570. 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 Glen's climate compare?
Glen is warmer than 38 of the other 140 places with their own NOAA record in Montana, and wetter than 0. Across the 7,247 U.S. stations with normals, its annual mean of 42.5°F is warmer than 11%.
In the Köppen classification computed from these normals, Glen 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 Glen's climate
What is the coldest month in Glen?
December, with a normal high of 36°F and a normal low of 8°F. The warmest is July (86°F by day, 44°F at night).
Does it snow in Glen?
Yes: 10 inches in a normal year, falling on 8 days with 0.1 inch or more, the most in December (2.5 inches).
What is the rainiest month in Glen?
May, with 1.74 in of precipitation in a normal year; the driest is January with 0.24 in.
What plant hardiness zone is Glen in?
The USDA's 2023 map puts Glen in zone 4b in ZIP code 59732, the nearest ZIP area. By the same method at Glen's NOAA station, the coldest night of a typical year reaches −24°F (16 years, 1991-2020): zone 4b.
Nearby and next
- Montana climateThe statewide normals and every place in the state
- Divide, MT16 miles from this station, 40.9°F a year
- Twin Bridges, MT18 miles from this station, 43.5°F a year
- Dillon, MT20 miles from this station, 41.8°F a year
- Wise River (3 mi WNW), MT24 miles from this station, 37.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made