San Juan County Weather in December
Average highs run from 43°F on December 1 to 38°F on December 31, and lows from 23°F to 19°F. Normal precipitation for the month is 1.05 in over about 5 wet days.
December day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
December at a glance
- Average high
- 39°F
- Average low
- 20°F
- Precipitation
- 1.05 in
- Snowfall
- 7.6 in
- Record high
- 65°FDec 3, 1929
- Record low
- -13°FDec 23, 1990
- Chance of a freeze
- 100%
- Daylight
- 9 h 45 min to 9 h 37 min
- Cloud cover
- 52%
- Humidity
- 61%
- Dew point
- 18°F
- Wind
- 7.2 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Dec 1 | 43°F | 23°F | 63°F 1929 | -4°F 1931 | 16% | 9% |
| Dec 2 | 43°F | 23°F | 64°F 1929 | 4°F 1931 | 16% | 10% |
| Dec 3 | 42°F | 23°F | 65°F 1929 | 4°F 1931 | 16% | 10% |
| Dec 4 | 42°F | 22°F | 60°F 1939 | 7°F 1952 | 16% | 10% |
| Dec 5 | 42°F | 22°F | 61°F 1995 | 2°F 1931 | 16% | 11% |
| Dec 6 | 41°F | 22°F | 62°F 1995 | -9°F 1931 | 17% | 11% |
| Dec 7 | 41°F | 22°F | 57°F 1929 | -3°F 1931 | 17% | 11% |
| Dec 8 | 41°F | 21°F | 58°F 1962 | -11°F 1978 | 17% | 11% |
| Dec 9 | 40°F | 21°F | 60°F 1950 | -8°F 1978 | 17% | 12% |
| Dec 10 | 40°F | 21°F | 61°F 1904 | -4°F 1978 | 17% | 12% |
| Dec 11 | 40°F | 21°F | 58°F 1958 | -7°F 1961 | 18% | 12% |
| Dec 12 | 40°F | 20°F | 60°F 1950 | -8°F 1961 | 18% | 13% |
| Dec 13 | 39°F | 20°F | 58°F 1950 | -11°F 1931 | 18% | 13% |
| Dec 14 | 39°F | 20°F | 56°F 1921 | -11°F 1931 | 18% | 13% |
| Dec 15 | 39°F | 20°F | 60°F 1980 | -4°F 1945 | 18% | 13% |
| Dec 16 | 39°F | 20°F | 63°F 1980 | -3°F 1931 | 18% | 14% |
| Dec 17 | 39°F | 19°F | 61°F 1980 | -3°F 1945 | 18% | 14% |
| Dec 18 | 38°F | 19°F | 56°F 1942 | -2°F 1928 | 19% | 14% |
| Dec 19 | 38°F | 19°F | 54°F 1917 | -5°F 1945 | 19% | 14% |
| Dec 20 | 38°F | 19°F | 56°F 1950 | -9°F 1932 | 19% | 14% |
| Dec 21 | 38°F | 19°F | 54°F 1958 | -4°F 1951 | 19% | 14% |
| Dec 22 | 38°F | 19°F | 59°F 2025 | -4°F 1967 | 19% | 15% |
| Dec 23 | 38°F | 19°F | 60°F 2005 | -13°F 1990 | 19% | 15% |
| Dec 24 | 38°F | 19°F | 58°F 2005 | -9°F 1990 | 19% | 15% |
| Dec 25 | 38°F | 19°F | 54°F 1980 | -9°F 1908 | 19% | 15% |
| Dec 26 | 38°F | 19°F | 58°F 1980 | -10°F 1924 | 19% | 15% |
| Dec 27 | 38°F | 19°F | 55°F 1980 | -8°F 1924 | 19% | 15% |
| Dec 28 | 38°F | 19°F | 58°F 1917 | -3°F 1924 | 19% | 15% |
| Dec 29 | 38°F | 19°F | 59°F 1980 | -5°F 1966 | 19% | 15% |
| Dec 30 | 38°F | 19°F | 57°F 1997 | -5°F 1990 | 19% | 15% |
| Dec 31 | 38°F | 19°F | 56°F 1917 | -3°F 1931 | 19% | 15% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MST).
- December 1
- sunrise 7:16 AM, sunset 5:01 PM
- December 31
- sunrise 7:34 AM, sunset 5:11 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00426053 (Natural Bridges Nm), public domain. Records: NOAA GHCN-Daily, station USC00420738, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.