Oceanside weather in December: Oceanside, California: normal highs, lows, rain and records for December
Oceanside in December has a normal high of 66°F and a normal low of 40°F, a daily mean of 53°F, falling from 68°F on the 1st to 66°F by the 31st. Measurable precipitation falls on 7 days in a normal December, 1.98 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 19°C and low of 4°C, 50 mm of precipitation in December.
- NOAA stationOceanside Municipal Airport
- Station IDUSW00053121
- Location33.22°N 117.35°W
- Elevation28 ft (9 m)
- From the center3 miles
- Population170,941
- Jan 67° 41°
- Feb 66° 42°
- Mar 66° 46°
- Apr 69° 48°
- May 70° 54°
- Jun 73° 58°
- Jul 77° 62°
- Aug 78° 62°
- Sep 78° 59°
- Oct 75° 53°
- Nov 71° 44°
- Dec 66° 40°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Oceanside in December?
The normal high is 66°F and the normal low 40°F, for a daily mean of 52.9°F. December is 4.5°F cooler than November and 0.7°F cooler than January. December is the 12th warmest month of the year in Oceanside and the 3rd wettest. Across the month the normal high falls 2°F, from 68°F on December 1 to 66°F on December 31. From one year to the next December's mean temperature typically moves about 1.6°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 51°F and 55°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 23%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 68°F | 40°F | 21% | 9% |
| December 8 | 67°F | 40°F | 22% | 10% |
| December 15 | 66°F | 40°F | 23% | 11% |
| December 22 | 66°F | 40°F | 23% | 12% |
| December 31 | 66°F | 40°F | 23% | 12% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 12)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 68°F | 40°F | 21% | 9% | 10 h 10 min |
| December 2 | 68°F | 40°F | 21% | 10% | 10 h 10 min |
| December 3 | 67°F | 40°F | 21% | 10% | 10 h 10 min |
| December 4 | 67°F | 40°F | 22% | 10% | 10 h 10 min |
| December 5 | 67°F | 40°F | 22% | 10% | 10 h |
| December 6 | 67°F | 40°F | 22% | 10% | 10 h |
| December 7 | 67°F | 40°F | 22% | 10% | 10 h |
| December 8 | 67°F | 40°F | 22% | 10% | 10 h |
| December 9 | 66°F | 40°F | 22% | 11% | 10 h |
| December 10 | 66°F | 40°F | 22% | 11% | 10 h |
| December 11 | 66°F | 40°F | 22% | 11% | 10 h |
| December 12 | 66°F | 40°F | 23% | 11% | 10 h |
| December 13 | 66°F | 40°F | 23% | 11% | 10 h |
| December 14 | 66°F | 40°F | 23% | 11% | 10 h |
| December 15 | 66°F | 40°F | 23% | 11% | 10 h |
| December 16 | 66°F | 40°F | 23% | 12% | 10 h |
| December 17 | 66°F | 40°F | 23% | 12% | 10 h |
| December 18 | 66°F | 40°F | 23% | 12% | 10 h |
| December 19 | 66°F | 40°F | 23% | 12% | 10 h |
| December 20 | 66°F | 40°F | 23% | 12% | 10 h |
| December 21 | 66°F | 40°F | 23% | 12% | 10 h |
| December 22 | 66°F | 40°F | 23% | 12% | 10 h |
| December 23 | 66°F | 40°F | 23% | 12% | 10 h |
| December 24 | 66°F | 40°F | 23% | 12% | 10 h |
| December 25 | 66°F | 40°F | 23% | 12% | 10 h |
| December 26 | 66°F | 40°F | 23% | 12% | 10 h |
| December 27 | 66°F | 40°F | 23% | 12% | 10 h |
| December 28 | 66°F | 40°F | 23% | 12% | 10 h |
| December 29 | 66°F | 40°F | 23% | 12% | 10 h |
| December 30 | 66°F | 40°F | 23% | 12% | 10 h |
| December 31 | 66°F | 40°F | 23% | 12% | 10 h |
- Normal high
- 66°FDecember average
- Normal low
- 40°FDecember average
- Precipitation
- 1.98 inmonth total
- Days with precipitation
- 70.01 inch or more
- Nights at 32°F or colder
- 4
- Daylight
- 10 h 10 min to 10 hDecember 1 to December 31
- Days at 70°F or more
- 8
- Days at 80°F or more
- 1
- Sunshine
- 83%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00053121; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Oceanside in December?
On a given December day the chance of 0.01 inch or more is 22% on average, highest around December 18 (23%). In all, 1.98 in falls on 7 days of a normal December, 1 of them with an inch or more.
In a normal December in Oceanside, 4 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00053121.
What are the records for December in Oceanside?
The warmest December temperature on this station's record (since 1999) is 86°F, on December 7, 2001; the coldest is 25°F, on December 23, 2011. The wettest December brought 8.11 in (2010).
The December mean against the 1991-2020 normal of 52.9°F: 2021 52.5°F (−0.4), 2022 52.7°F (−0.2), 2023 56.4°F (+3.5), 2024 53.3°F (+0.4), 2025 56.8°F (+3.9). 3 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 52.5°F | −0.4°F | 3.70 in |
| 2022 | 52.7°F | −0.2°F | 2.04 in |
| 2023 | 56.4°F | +3.5°F | 0.92 in |
| 2024 | 53.3°F | +0.4°F | 0.00 in |
| 2025 | 56.8°F | +3.9°F | 1.25 in |
Source: records: ACIS, station USW00053121; recent months: ACIS, station USW00053121. Records and recent months use complete months only.
How does December in Oceanside 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; Oceanside's is 66°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Oceanside in November71°F by day, 44°F at night
- Oceanside in January67°F by day, 41°F at night
- Oceanside through the yearEvery month, frost dates, records and recent years
- California in DecemberThe statewide normal and the warmest and coolest places
- Anaheim: California's warmest Decembernormal high 71°F