Lewistown weather in December: Lewistown, Montana: normal highs, lows, rain and records for December
Lewistown in December has a normal high of 35°F and a normal low of 14°F, a daily mean of 24°F, falling from 38°F on the 1st to 34°F by the 31st. Measurable precipitation falls on 7 days in a normal December, 0.51 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 2°C and low of −10°C, 13 mm of precipitation in December.
- NOAA stationLewistown Municipal Airport
- Station IDUSW00024036
- Location47.05°N 109.46°W
- Elevation4,145 ft (1,263 m)
- Population6,204
- Jan 34° 13°
- Feb 35° 14°
- Mar 44° 21°
- Apr 53° 29°
- May 63° 37°
- Jun 71° 45°
- Jul 82° 51°
- Aug 81° 50°
- Sep 70° 42°
- Oct 56° 31°
- Nov 43° 21°
- Dec 35° 14°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Lewistown in December?
The normal high is 35°F and the normal low 14°F, for a daily mean of 24.3°F. December is 7.8°F cooler than November and 0.6°F warmer than January. December is the 11th warmest month of the year in Lewistown and the 11th wettest. Across the month the normal high falls 4°F, from 38°F on December 1 to 34°F on December 31. From one year to the next December's mean temperature typically moves about 5.3°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 19°F and 30°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 25%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 38°F | 17°F | 23% | 5% |
| December 8 | 36°F | 15°F | 22% | 5% |
| December 15 | 35°F | 13°F | 23% | 5% |
| December 22 | 34°F | 13°F | 24% | 6% |
| December 31 | 34°F | 12°F | 25% | 7% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 26)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 38°F | 17°F | 23% | 5% | 8 h 50 min |
| December 2 | 38°F | 16°F | 23% | 5% | 8 h 50 min |
| December 3 | 37°F | 16°F | 22% | 5% | 8 h 50 min |
| December 4 | 37°F | 16°F | 22% | 5% | 8 h 40 min |
| December 5 | 37°F | 16°F | 22% | 5% | 8 h 40 min |
| December 6 | 36°F | 15°F | 22% | 5% | 8 h 40 min |
| December 7 | 36°F | 15°F | 22% | 5% | 8 h 40 min |
| December 8 | 36°F | 15°F | 22% | 5% | 8 h 40 min |
| December 9 | 36°F | 15°F | 22% | 5% | 8 h 40 min |
| December 10 | 35°F | 14°F | 22% | 5% | 8 h 40 min |
| December 11 | 35°F | 14°F | 22% | 5% | 8 h 40 min |
| December 12 | 35°F | 14°F | 23% | 5% | 8 h 30 min |
| December 13 | 35°F | 14°F | 23% | 5% | 8 h 30 min |
| December 14 | 35°F | 14°F | 23% | 5% | 8 h 30 min |
| December 15 | 35°F | 13°F | 23% | 5% | 8 h 30 min |
| December 16 | 35°F | 13°F | 23% | 5% | 8 h 30 min |
| December 17 | 34°F | 13°F | 23% | 5% | 8 h 30 min |
| December 18 | 34°F | 13°F | 23% | 5% | 8 h 30 min |
| December 19 | 34°F | 13°F | 23% | 5% | 8 h 30 min |
| December 20 | 34°F | 13°F | 24% | 6% | 8 h 30 min |
| December 21 | 34°F | 13°F | 24% | 6% | 8 h 30 min |
| December 22 | 34°F | 13°F | 24% | 6% | 8 h 30 min |
| December 23 | 34°F | 12°F | 24% | 6% | 8 h 30 min |
| December 24 | 34°F | 12°F | 24% | 6% | 8 h 30 min |
| December 25 | 34°F | 12°F | 24% | 6% | 8 h 30 min |
| December 26 | 34°F | 12°F | 24% | 6% | 8 h 30 min |
| December 27 | 34°F | 12°F | 25% | 6% | 8 h 30 min |
| December 28 | 34°F | 12°F | 25% | 6% | 8 h 30 min |
| December 29 | 34°F | 12°F | 25% | 7% | 8 h 30 min |
| December 30 | 34°F | 12°F | 25% | 7% | 8 h 30 min |
| December 31 | 34°F | 12°F | 25% | 7% | 8 h 30 min |
- Normal high
- 35°FDecember average
- Normal low
- 14°FDecember average
- Precipitation
- 0.51 inmonth total
- Days with precipitation
- 70.01 inch or more
- Nights at 32°F or colder
- 29
- Daylight
- 8 h 50 min to 8 h 30 minDecember 1 to December 31
- Sunshine
- 67%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00024036; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Lewistown in December?
On a given December day the chance of 0.01 inch or more is 23% on average, highest around December 31 (25%). In all, 0.51 in falls on 7 days of a normal December.
In a normal December in Lewistown, 29 nights fall to freezing and 11 days stay below freezing all day.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024036.
How humid and windy is Lewistown in December?
At 3 p.m. the normal temperature is 28°F with 57% relative humidity and a dew point of 15°F; at 6 a.m. it is 20°F with 68% humidity. The wind averages 9.8 mph, most often from the west in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 20°F | 11°F | 68% | 9.3 mph | – |
| 9 a.m. | 21°F | 12°F | 68% | 9.4 mph | – |
| noon | 27°F | 14°F | 58% | 10.3 mph | – |
| 3 p.m. | 28°F | 15°F | 57% | 10.4 mph | – |
| 6 p.m. | 23°F | 13°F | 66% | 10.0 mph | – |
| 9 p.m. | 21°F | 12°F | 68% | 9.5 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00024036. 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 Lewistown?
The warmest December temperature on this station's record (since 1896) is 74°F, on December 5, 1939; the coldest is −42°F, on December 24, 1983. The wettest December brought 2.67 in (1951); the snowiest, 40.0 inches (1951).
The December mean against the 1991-2020 normal of 24.3°F: 2021 20.2°F (−4.1), 2022 15.3°F (−9.0), 2023 34.3°F (+10.0), 2024 33.5°F (+9.2), 2025 32.0°F (+7.7). 3 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 20.2°F | −4.1°F | 0.74 in |
| 2022 | 15.3°F | −9.0°F | 0.18 in |
| 2023 | 34.3°F | +10.0°F | 0.34 in |
| 2024 | 33.5°F | +9.2°F | 0.46 in |
| 2025 | 32.0°F | +7.7°F | 1.03 in |
Source: records: ACIS, station USW00024036; recent months: ACIS, station USW00024036. Records and recent months use complete months only.
How does December in Lewistown 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; Lewistown's is 35°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.