Glasgow weather in December: Glasgow, Montana: normal highs, lows, rain and records for December
Glasgow in December has a normal high of 27°F and a normal low of 10°F, a daily mean of 19°F, falling from 33°F on the 1st to 24°F by the 31st. Measurable precipitation falls on 7 days in a normal December, 0.43 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of −3°C and low of −12°C, 11 mm of precipitation and 21 cm of snow in December.
- NOAA stationGlasgow International Airport
- Station IDUSW00094008
- Location48.21°N 106.62°W
- Elevation2,285 ft (697 m)
- Population3,169
- Jan 24° 6°
- Feb 28° 9°
- Mar 42° 21°
- Apr 57° 33°
- May 68° 43°
- Jun 76° 53°
- Jul 86° 59°
- Aug 85° 57°
- Sep 73° 47°
- Oct 57° 34°
- Nov 40° 21°
- Dec 27° 10°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Glasgow in December?
The normal high is 27°F and the normal low 10°F, for a daily mean of 18.5°F. December is 11.7°F cooler than November and 3.9°F warmer than January. December is the 11th warmest month of the year in Glasgow and the 11th wettest. Across the month the normal high falls 9°F, from 33°F on December 1 to 24°F on December 31. From one year to the next December's mean temperature typically moves about 6.9°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 12°F and 25°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 24%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 33°F | 14°F | 21% | 4% |
| December 8 | 30°F | 12°F | 21% | 4% |
| December 15 | 27°F | 10°F | 21% | 4% |
| December 22 | 25°F | 8°F | 22% | 5% |
| December 31 | 24°F | 6°F | 24% | 5% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 33°F | 14°F | 21% | 4% | 8 h 40 min |
| December 2 | 32°F | 14°F | 21% | 4% | 8 h 40 min |
| December 3 | 32°F | 14°F | 21% | 4% | 8 h 40 min |
| December 4 | 31°F | 13°F | 21% | 4% | 8 h 40 min |
| December 5 | 31°F | 13°F | 21% | 4% | 8 h 30 min |
| December 6 | 31°F | 13°F | 21% | 4% | 8 h 30 min |
| December 7 | 30°F | 12°F | 21% | 4% | 8 h 30 min |
| December 8 | 30°F | 12°F | 21% | 4% | 8 h 30 min |
| December 9 | 29°F | 12°F | 21% | 4% | 8 h 30 min |
| December 10 | 29°F | 11°F | 21% | 4% | 8 h 30 min |
| December 11 | 29°F | 11°F | 21% | 4% | 8 h 30 min |
| December 12 | 28°F | 11°F | 21% | 4% | 8 h 30 min |
| December 13 | 28°F | 10°F | 21% | 4% | 8 h 20 min |
| December 14 | 27°F | 10°F | 21% | 4% | 8 h 20 min |
| December 15 | 27°F | 10°F | 21% | 4% | 8 h 20 min |
| December 16 | 27°F | 9°F | 21% | 4% | 8 h 20 min |
| December 17 | 26°F | 9°F | 21% | 4% | 8 h 20 min |
| December 18 | 26°F | 9°F | 22% | 4% | 8 h 20 min |
| December 19 | 26°F | 9°F | 22% | 5% | 8 h 20 min |
| December 20 | 26°F | 8°F | 22% | 5% | 8 h 20 min |
| December 21 | 25°F | 8°F | 22% | 5% | 8 h 20 min |
| December 22 | 25°F | 8°F | 22% | 5% | 8 h 20 min |
| December 23 | 25°F | 8°F | 22% | 5% | 8 h 20 min |
| December 24 | 25°F | 7°F | 23% | 5% | 8 h 20 min |
| December 25 | 24°F | 7°F | 23% | 5% | 8 h 20 min |
| December 26 | 24°F | 7°F | 23% | 5% | 8 h 20 min |
| December 27 | 24°F | 7°F | 23% | 5% | 8 h 20 min |
| December 28 | 24°F | 7°F | 24% | 5% | 8 h 20 min |
| December 29 | 24°F | 7°F | 24% | 5% | 8 h 20 min |
| December 30 | 24°F | 6°F | 24% | 5% | 8 h 20 min |
| December 31 | 24°F | 6°F | 24% | 5% | 8 h 20 min |
- Normal high
- 27°FDecember average
- Normal low
- 10°FDecember average
- Precipitation
- 0.43 inmonth total
- Days with precipitation
- 70.01 inch or more
- Snowfall
- 8.3 inmonth total
- Nights at 32°F or colder
- 31
- Daylight
- 8 h 40 min to 8 h 20 minDecember 1 to December 31
- Sunshine
- 68%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094008; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Glasgow in December?
On a given December day the chance of 0.01 inch or more is 22% on average, highest around December 31 (24%). In all, 0.43 in falls on 7 days of a normal December.
In a normal December in Glasgow, 31 nights fall to freezing, 18 days stay below freezing all day and snowfall averages 8.3 inches.
Snow falls on 7 days in a normal December, and an inch or more covers the ground on 17 days.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094008.
How humid and windy is Glasgow in December?
At 3 p.m. the normal temperature is 19°F with 70% relative humidity and a dew point of 11°F; at 6 a.m. it is 11°F with 82% humidity. The wind averages 9.0 mph, most often from the northwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 11°F | 6°F | 82% | 8.7 mph | 58% |
| 9 a.m. | 11°F | 7°F | 82% | 8.6 mph | 58% |
| noon | 17°F | 10°F | 73% | 9.2 mph | 61% |
| 3 p.m. | 19°F | 11°F | 70% | 9.3 mph | 59% |
| 6 p.m. | 15°F | 9°F | 77% | 9.3 mph | 60% |
| 9 p.m. | 13°F | 8°F | 79% | 9.2 mph | 60% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00094008. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for December in Glasgow?
The warmest December temperature on Glasgow's official record (since 1893) is 69°F, on December 8, 1939; the coldest is −47°F, on December 19, 1924. The wettest December brought 1.72 in (2025); the snowiest, 24.8 inches (2008).
The December mean against the 1991-2020 normal of 18.5°F: 2021 11.9°F (−6.6), 2022 7.4°F (−11.1), 2023 31.4°F (+12.9), 2024 23.5°F (+5.0), 2025 16.6°F (−1.9). 2 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 11.9°F | −6.6°F | 0.86 in |
| 2022 | 7.4°F | −11.1°F | 0.87 in |
| 2023 | 31.4°F | +12.9°F | 0.09 in |
| 2024 | 23.5°F | +5.0°F | 0.22 in |
| 2025 | 16.6°F | −1.9°F | 1.72 in |
Source: records: ACIS, NWS threaded record GGWthr; recent months: ACIS, station USW00094008. Records and recent months use complete months only.
How does December in Glasgow compare across Montana?
Across the 141 places PlainClimate covers in Montana, December normal highs run from 22°F in Cooke City to 39°F in Geraldine; Glasgow's is 27°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.