Merlin Weather in December
Average highs run from 48°F on December 1 to 45°F on December 31, and lows from 37°F to 35°F. Normal precipitation for the month is 6.55 in over about 17 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
- 46°F
- Average low
- 35°F
- Precipitation
- 6.55 in
- Snowfall
- 0.1 in
- Record high
- 66°FDec 16, 1980
- Record low
- -4°FDec 21, 1990
- Chance of a freeze
- 96%
- Daylight
- 9 h 18 min to 9 h 07 min
- Cloud cover
- 72%
- Humidity
- 93%
- Dew point
- 36°F
- Wind
- 4.7 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 | 48°F | 37°F | 63°F 2021 | 23°F 2007 | 56% | 0% |
| Dec 2 | 48°F | 37°F | 62°F 1976 | 24°F 1971 | 56% | 0% |
| Dec 3 | 47°F | 37°F | 60°F 1976 | 20°F 1948 | 56% | 0% |
| Dec 4 | 47°F | 36°F | 58°F 2024 | 15°F 1972 | 56% | 0% |
| Dec 5 | 47°F | 36°F | 61°F 2000 | 15°F 1972 | 56% | 0% |
| Dec 6 | 47°F | 36°F | 61°F 2000 | 15°F 1972 | 56% | 0% |
| Dec 7 | 47°F | 36°F | 61°F 1962 | 3°F 1972 | 56% | 0% |
| Dec 8 | 46°F | 36°F | 62°F 1979 | 2°F 1972 | 56% | 0% |
| Dec 9 | 46°F | 36°F | 61°F 1957 | 7°F 1972 | 56% | 0% |
| Dec 10 | 46°F | 36°F | 59°F 1957 | 7°F 1972 | 56% | 0% |
| Dec 11 | 46°F | 35°F | 60°F 1951 | 14°F 1972 | 56% | 1% |
| Dec 12 | 46°F | 35°F | 64°F 2025 | 17°F 1967 | 56% | 1% |
| Dec 13 | 46°F | 35°F | 63°F 2025 | 14°F 1967 | 56% | 1% |
| Dec 14 | 45°F | 35°F | 59°F 1958 | 14°F 1967 | 56% | 1% |
| Dec 15 | 45°F | 35°F | 63°F 1980 | 20°F 1948 | 55% | 1% |
| Dec 16 | 45°F | 35°F | 66°F 1980 | 18°F 2008 | 55% | 1% |
| Dec 17 | 45°F | 35°F | 63°F 1980 | 19°F 2008 | 55% | 1% |
| Dec 18 | 45°F | 35°F | 61°F 2004 | 20°F 1967 | 55% | 1% |
| Dec 19 | 45°F | 35°F | 63°F 1985 | 14°F 1990 | 55% | 1% |
| Dec 20 | 45°F | 35°F | 61°F 1954 | 2°F 1990 | 55% | 1% |
| Dec 21 | 45°F | 34°F | 60°F 1985 | -4°F 1990 | 55% | 1% |
| Dec 22 | 45°F | 34°F | 62°F 1985 | 7°F 1990 | 55% | 1% |
| Dec 23 | 45°F | 34°F | 64°F 1985 | 11°F 1983 | 55% | 1% |
| Dec 24 | 45°F | 34°F | 63°F 1985 | 19°F 1948 | 55% | 1% |
| Dec 25 | 45°F | 34°F | 63°F 1985 | 21°F 1974 | 55% | 1% |
| Dec 26 | 45°F | 34°F | 61°F 1956 | 19°F 1988 | 55% | 1% |
| Dec 27 | 45°F | 34°F | 56°F 1967 | 19°F 1954 | 55% | 1% |
| Dec 28 | 45°F | 34°F | 54°F 1959 | 17°F 1968 | 55% | 1% |
| Dec 29 | 45°F | 34°F | 59°F 1956 | 14°F 1990 | 55% | 1% |
| Dec 30 | 45°F | 34°F | 63°F 1980 | 15°F 1978 | 55% | 1% |
| Dec 31 | 45°F | 35°F | 64°F 1980 | 18°F 1959 | 55% | 1% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PST).
- December 1
- sunrise 7:24 AM, sunset 4:42 PM
- December 31
- sunrise 7:43 AM, sunset 4:50 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00353445 (Grants Pass), public domain. Records: NOAA GHCN-Daily, station USW00024235, 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.