Petaluma weather in December: Petaluma, California: normal highs, lows, rain and records for December
Petaluma in December has a normal high of 58°F and a normal low of 38°F, a daily mean of 48°F, falling from 60°F on the 1st to 57°F by the 31st. Measurable precipitation falls on 12 days in a normal December, 5.19 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 14°C and low of 4°C, 132 mm of precipitation in December.
- NOAA stationPetaluma Airport
- Station IDUSC00046826
- Location38.26°N 122.61°W
- Elevation20 ft (6 m)
- Population59,393
- Jan 58° 39°
- Feb 61° 40°
- Mar 65° 42°
- Apr 68° 44°
- May 72° 47°
- Jun 78° 50°
- Jul 81° 52°
- Aug 81° 53°
- Sep 82° 51°
- Oct 76° 48°
- Nov 66° 42°
- Dec 58° 38°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Petaluma in December?
The normal high is 58°F and the normal low 38°F, for a daily mean of 48.1°F. December is 5.8°F cooler than November and 0.2°F cooler than January. December is the 12th warmest month of the year in Petaluma and the 2nd wettest. Across the month the normal high falls 3°F, from 60°F on December 1 to 57°F on December 31. From one year to the next December's mean temperature typically moves about 2.2°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 46°F and 50°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 39%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 60°F | 40°F | 35% | 24% |
| December 8 | 59°F | 39°F | 37% | 26% |
| December 15 | 58°F | 38°F | 39% | 27% |
| December 22 | 57°F | 38°F | 39% | 28% |
| December 31 | 57°F | 38°F | 39% | 28% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 18)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 60°F | 40°F | 35% | 24% | 9 h 40 min |
| December 2 | 60°F | 40°F | 35% | 24% | 9 h 40 min |
| December 3 | 60°F | 39°F | 36% | 25% | 9 h 40 min |
| December 4 | 60°F | 39°F | 36% | 25% | 9 h 40 min |
| December 5 | 59°F | 39°F | 36% | 25% | 9 h 40 min |
| December 6 | 59°F | 39°F | 37% | 25% | 9 h 40 min |
| December 7 | 59°F | 39°F | 37% | 26% | 9 h 40 min |
| December 8 | 59°F | 39°F | 37% | 26% | 9 h 40 min |
| December 9 | 59°F | 39°F | 38% | 26% | 9 h 40 min |
| December 10 | 58°F | 39°F | 38% | 26% | 9 h 30 min |
| December 11 | 58°F | 39°F | 38% | 27% | 9 h 30 min |
| December 12 | 58°F | 38°F | 38% | 27% | 9 h 30 min |
| December 13 | 58°F | 38°F | 39% | 27% | 9 h 30 min |
| December 14 | 58°F | 38°F | 39% | 27% | 9 h 30 min |
| December 15 | 58°F | 38°F | 39% | 27% | 9 h 30 min |
| December 16 | 58°F | 38°F | 39% | 27% | 9 h 30 min |
| December 17 | 58°F | 38°F | 39% | 27% | 9 h 30 min |
| December 18 | 57°F | 38°F | 39% | 27% | 9 h 30 min |
| December 19 | 57°F | 38°F | 39% | 28% | 9 h 30 min |
| December 20 | 57°F | 38°F | 39% | 28% | 9 h 30 min |
| December 21 | 57°F | 38°F | 39% | 28% | 9 h 30 min |
| December 22 | 57°F | 38°F | 39% | 28% | 9 h 30 min |
| December 23 | 57°F | 38°F | 39% | 28% | 9 h 30 min |
| December 24 | 57°F | 38°F | 39% | 28% | 9 h 30 min |
| December 25 | 57°F | 38°F | 39% | 28% | 9 h 30 min |
| December 26 | 57°F | 38°F | 39% | 28% | 9 h 30 min |
| December 27 | 57°F | 38°F | 39% | 28% | 9 h 30 min |
| December 28 | 57°F | 38°F | 39% | 28% | 9 h 30 min |
| December 29 | 57°F | 38°F | 39% | 28% | 9 h 30 min |
| December 30 | 57°F | 38°F | 39% | 28% | 9 h 30 min |
| December 31 | 57°F | 38°F | 39% | 28% | 9 h 30 min |
- Normal high
- 58°FDecember average
- Normal low
- 38°FDecember average
- Precipitation
- 5.19 inmonth total
- Days with precipitation
- 120.01 inch or more
- Nights at 32°F or colder
- 8
- Daylight
- 9 h 40 min to 9 h 30 minDecember 1 to December 31
- Sunshine
- 72%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00046826; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Petaluma in December?
On a given December day the chance of 0.01 inch or more is 38% on average, highest around December 30 (39%). In all, 5.19 in falls on 12 days of a normal December, 1 of them with an inch or more.
In a normal December in Petaluma, 8 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00046826.
What are the records for December in Petaluma?
The warmest December temperature on this station's record (since 1893) is 81°F, on December 26, 1967; the coldest is 16°F, on December 14, 1932. The wettest December brought 15.60 in (2014).
The December mean against the 1991-2020 normal of 48.1°F: 2021 47.5°F (−0.6), 2022 47.2°F (−0.9), 2023 52.0°F (+3.9), 2024 50.8°F (+2.7), 2025 49.1°F (+1.0). 3 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 47.5°F | −0.6°F | 5.91 in |
| 2022 | 47.2°F | −0.9°F | 8.29 in |
| 2023 | 52.0°F | +3.9°F | 4.62 in |
| 2024 | 50.8°F | +2.7°F | 7.36 in |
| 2025 | 49.1°F | +1.0°F | 4.32 in |
Source: records: ACIS, station USC00046826; recent months: ACIS, station USC00046826. Records and recent months use complete months only.
How does December in Petaluma compare across California?
Across the 219 places PlainClimate covers in California, December normal highs run from 38°F in Tahoma to 71°F in Anaheim; Petaluma's is 58°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.