Alamosa weather in December: Alamosa, Colorado: normal highs, lows, rain and records for December
Alamosa in December has a normal high of 35°F and a normal low of 1°F, a daily mean of 18°F, falling from 40°F on the 1st to 33°F by the 31st. Measurable precipitation falls on 4 days in a normal December, 0.34 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 2°C and low of −17°C, 9 mm of precipitation and 12 cm of snow in December.
- NOAA stationAlamosa-Bergman Field
- Station IDUSW00023061
- Location37.44°N 105.86°W
- Elevation7,533 ft (2,296 m)
- From the center3 miles
- Population9,906
- Jan 35° -1°
- Feb 41° 7°
- Mar 53° 18°
- Apr 60° 25°
- May 70° 34°
- Jun 80° 41°
- Jul 83° 47°
- Aug 81° 46°
- Sep 74° 37°
- Oct 63° 25°
- Nov 49° 12°
- Dec 35° 1°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Alamosa in December?
The normal high is 35°F and the normal low 1°F, for a daily mean of 18.1°F. December is 12.2°F cooler than November and 1.3°F warmer than January. December is the 11th warmest month of the year in Alamosa and the 10th wettest, and the snowiest. Across the month the normal high falls 7°F, from 40°F on December 1 to 33°F on December 31. From one year to the next December's mean temperature typically moves about 5.5°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 13°F and 24°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 14%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 40°F | 5°F | 13% | 4% |
| December 8 | 37°F | 3°F | 14% | 4% |
| December 15 | 35°F | 1°F | 14% | 4% |
| December 22 | 34°F | −1°F | 13% | 4% |
| December 31 | 33°F | −2°F | 12% | 4% |
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 | 40°F | 5°F | 13% | 4% | 9 h 50 min |
| December 2 | 40°F | 5°F | 13% | 4% | 9 h 50 min |
| December 3 | 39°F | 5°F | 13% | 4% | 9 h 50 min |
| December 4 | 39°F | 4°F | 14% | 4% | 9 h 40 min |
| December 5 | 38°F | 4°F | 14% | 4% | 9 h 40 min |
| December 6 | 38°F | 4°F | 14% | 4% | 9 h 40 min |
| December 7 | 38°F | 3°F | 14% | 4% | 9 h 40 min |
| December 8 | 37°F | 3°F | 14% | 4% | 9 h 40 min |
| December 9 | 37°F | 2°F | 14% | 4% | 9 h 40 min |
| December 10 | 36°F | 2°F | 14% | 4% | 9 h 40 min |
| December 11 | 36°F | 2°F | 14% | 4% | 9 h 40 min |
| December 12 | 36°F | 2°F | 14% | 4% | 9 h 40 min |
| December 13 | 35°F | 1°F | 14% | 4% | 9 h 40 min |
| December 14 | 35°F | 1°F | 14% | 4% | 9 h 40 min |
| December 15 | 35°F | 1°F | 14% | 4% | 9 h 40 min |
| December 16 | 35°F | 0°F | 14% | 4% | 9 h 40 min |
| December 17 | 34°F | 0°F | 14% | 4% | 9 h 40 min |
| December 18 | 34°F | 0°F | 14% | 4% | 9 h 40 min |
| December 19 | 34°F | 0°F | 14% | 4% | 9 h 30 min |
| December 20 | 34°F | −1°F | 13% | 4% | 9 h 30 min |
| December 21 | 34°F | −1°F | 13% | 4% | 9 h 30 min |
| December 22 | 34°F | −1°F | 13% | 4% | 9 h 30 min |
| December 23 | 34°F | −1°F | 13% | 4% | 9 h 30 min |
| December 24 | 33°F | −1°F | 13% | 4% | 9 h 30 min |
| December 25 | 33°F | −1°F | 13% | 4% | 9 h 30 min |
| December 26 | 33°F | −2°F | 13% | 4% | 9 h 40 min |
| December 27 | 33°F | −2°F | 13% | 4% | 9 h 40 min |
| December 28 | 33°F | −2°F | 13% | 4% | 9 h 40 min |
| December 29 | 33°F | −2°F | 12% | 4% | 9 h 40 min |
| December 30 | 33°F | −2°F | 12% | 4% | 9 h 40 min |
| December 31 | 33°F | −2°F | 12% | 4% | 9 h 40 min |
- Normal high
- 35°FDecember average
- Normal low
- 1°FDecember average
- Precipitation
- 0.34 inmonth total
- Days with precipitation
- 40.01 inch or more
- Snowfall
- 4.6 inmonth total
- Nights at 32°F or colder
- 31
- Daylight
- 9 h 50 min to 9 h 40 minDecember 1 to December 31
- Sunshine
- 83%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00023061; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Alamosa in December?
On a given December day the chance of 0.01 inch or more is 13% on average, highest around December 10 (14%). In all, 0.34 in falls on 4 days of a normal December.
In a normal December in Alamosa, 31 nights fall to freezing, 12 days stay below freezing all day and snowfall averages 4.6 inches.
Snow falls on 4 days in a normal December, and an inch or more covers the ground on 11 days.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00023061.
How humid and windy is Alamosa in December?
At 3 p.m. the normal temperature is 31°F with 42% relative humidity and a dew point of 11°F; at 6 a.m. it is 3°F with 81% humidity. The wind averages 4.7 mph, most often from the west-southwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 3°F | −1°F | 81% | 3.8 mph | – |
| 9 a.m. | 12°F | 5°F | 73% | 2.9 mph | – |
| noon | 27°F | 10°F | 49% | 4.9 mph | 82% |
| 3 p.m. | 31°F | 11°F | 42% | 6.1 mph | 84% |
| 6 p.m. | 20°F | 9°F | 60% | 6.0 mph | 83% |
| 9 p.m. | 11°F | 5°F | 74% | 5.2 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00023061. 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 Alamosa?
The warmest December temperature on Alamosa's official record (since 1906) is 63°F, on December 30, 2017; the coldest is −42°F, on December 14, 1964. The wettest December brought 1.52 in (1964); the snowiest, 27.7 inches (1967).
The December mean against the 1991-2020 normal of 18.1°F: 2021 26.1°F (+8.0), 2022 23.4°F (+5.3), 2023 21.6°F (+3.5), 2024 25.4°F (+7.3), 2025 29.3°F (+11.2). 5 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 26.1°F | +8.0°F | 0.03 in |
| 2022 | 23.4°F | +5.3°F | 0.02 in |
| 2023 | 21.6°F | +3.5°F | 0.40 in |
| 2024 | 25.4°F | +7.3°F | 0.13 in |
| 2025 | 29.3°F | +11.2°F | 0.15 in |
Source: records: ACIS, NWS threaded record ALSthr; recent months: ACIS, station USW00023061. Records and recent months use complete months only.
How does December in Alamosa compare across Colorado?
Across the 125 places PlainClimate covers in Colorado, December normal highs run from 27°F in Crested Butte to 49°F in Campo; Alamosa's is 35°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.