Alta Weather in December
Average highs run from 46°F on December 1 to 46°F on December 31, and lows from 35°F to 34°F. Normal precipitation for the month is 10.90 in over about 14 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
- 45°F
- Average low
- 34°F
- Precipitation
- 10.90 in
- Snowfall
- 2.7 in
- Record high
- 75°FDec 2, 1958
- Record low
- 3°FDec 9, 1972
- Chance of a freeze
- 99%
- Daylight
- 9 h 37 min to 9 h 27 min
- Cloud cover
- 60%
- Humidity
- 70%
- Dew point
- 36°F
- Wind
- 6.7 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 | 46°F | 35°F | 69°F 1959 | 22°F 1973 | 39% | 3% |
| Dec 2 | 45°F | 34°F | 75°F 1958 | 20°F 1973 | 39% | 3% |
| Dec 3 | 45°F | 34°F | 70°F 1958 | 18°F 1952 | 40% | 3% |
| Dec 4 | 45°F | 34°F | 69°F 1963 | 12°F 1972 | 40% | 3% |
| Dec 5 | 45°F | 34°F | 67°F 1979 | 12°F 1972 | 40% | 3% |
| Dec 6 | 45°F | 34°F | 66°F 1962 | 13°F 1978 | 41% | 3% |
| Dec 7 | 45°F | 34°F | 69°F 1962 | 7°F 1972 | 41% | 3% |
| Dec 8 | 44°F | 34°F | 70°F 1957 | 4°F 1972 | 41% | 3% |
| Dec 9 | 44°F | 33°F | 72°F 1957 | 3°F 1972 | 41% | 3% |
| Dec 10 | 44°F | 33°F | 68°F 2025 | 10°F 1972 | 42% | 3% |
| Dec 11 | 44°F | 33°F | 68°F 2025 | 13°F 1972 | 42% | 4% |
| Dec 12 | 44°F | 33°F | 68°F 2017 | 14°F 1967 | 42% | 4% |
| Dec 13 | 44°F | 33°F | 70°F 2017 | 10°F 1967 | 43% | 4% |
| Dec 14 | 44°F | 33°F | 71°F 2017 | 9°F 1967 | 43% | 4% |
| Dec 15 | 44°F | 33°F | 69°F 1980 | 17°F 1948 | 43% | 4% |
| Dec 16 | 44°F | 33°F | 73°F 1980 | 17°F 1948 | 43% | 4% |
| Dec 17 | 44°F | 33°F | 66°F 1998 | 18°F 1967 | 43% | 4% |
| Dec 18 | 44°F | 33°F | 65°F 1958 | 19°F 1978 | 43% | 4% |
| Dec 19 | 44°F | 33°F | 66°F 1954 | 13°F 1949 | 43% | 4% |
| Dec 20 | 45°F | 33°F | 63°F 1954 | 12°F 1949 | 43% | 4% |
| Dec 21 | 45°F | 33°F | 63°F 1954 | 11°F 1998 | 43% | 4% |
| Dec 22 | 45°F | 33°F | 64°F 1954 | 17°F 1948 | 43% | 5% |
| Dec 23 | 45°F | 34°F | 66°F 1950 | 13°F 1948 | 42% | 5% |
| Dec 24 | 45°F | 34°F | 65°F 1947 | 13°F 1987 | 42% | 5% |
| Dec 25 | 45°F | 34°F | 70°F 1947 | 17°F 2016 | 42% | 5% |
| Dec 26 | 45°F | 34°F | 69°F 1956 | 18°F 1965 | 42% | 5% |
| Dec 27 | 45°F | 34°F | 70°F 1956 | 19°F 1954 | 42% | 5% |
| Dec 28 | 46°F | 34°F | 69°F 1956 | 18°F 1955 | 41% | 5% |
| Dec 29 | 46°F | 34°F | 66°F 1980 | 18°F 1955 | 41% | 5% |
| Dec 30 | 46°F | 34°F | 65°F 1980 | 14°F 1951 | 41% | 5% |
| Dec 31 | 46°F | 34°F | 64°F 1958 | 12°F 1964 | 41% | 5% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PST).
- December 1
- sunrise 7:04 AM, sunset 4:41 PM
- December 31
- sunrise 7:23 AM, sunset 4:50 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00023225 (Blue Canyon AP), public domain. Records: NOAA GHCN-Daily, station USW00023225, 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.