San Jacinto weather in December: San Jacinto, California: normal highs, lows, rain and records for December
San Jacinto in December has a normal high of 65°F and a normal low of 39°F, a daily mean of 52°F, falling from 67°F on the 1st to 65°F by the 31st. Measurable precipitation falls on 5 days in a normal December, 1.87 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 18°C and low of 4°C, 47 mm of precipitation in December.
- NOAA stationSan Jacinto
- Station IDUSC00047813
- Location33.80°N 116.98°W
- Elevation1,525 ft (465 m)
- From the center1 miles
- Population55,515
- Jan 66° 40°
- Feb 66° 42°
- Mar 70° 45°
- Apr 74° 48°
- May 80° 53°
- Jun 89° 58°
- Jul 95° 64°
- Aug 97° 64°
- Sep 92° 61°
- Oct 82° 53°
- Nov 73° 44°
- Dec 65° 39°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is San Jacinto in December?
The normal high is 65°F and the normal low 39°F, for a daily mean of 52.0°F. December is 6.5°F cooler than November and 0.9°F cooler than January. December is the 12th warmest month of the year in San Jacinto and the 3rd wettest. Across the month the normal high falls 2°F, from 67°F on December 1 to 65°F on December 31. From one year to the next December's mean temperature typically moves about 1.9°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 50°F and 54°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 18%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 67°F | 40°F | 14% | 9% |
| December 8 | 65°F | 39°F | 16% | 10% |
| December 15 | 64°F | 39°F | 17% | 11% |
| December 22 | 64°F | 39°F | 17% | 12% |
| December 31 | 65°F | 39°F | 18% | 12% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 17)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 67°F | 40°F | 14% | 9% | 10 h 10 min |
| December 2 | 67°F | 40°F | 14% | 9% | 10 h |
| December 3 | 67°F | 40°F | 15% | 10% | 10 h |
| December 4 | 66°F | 40°F | 15% | 10% | 10 h |
| December 5 | 66°F | 40°F | 15% | 10% | 10 h |
| December 6 | 66°F | 40°F | 15% | 10% | 10 h |
| December 7 | 66°F | 39°F | 15% | 10% | 10 h |
| December 8 | 65°F | 39°F | 16% | 10% | 10 h |
| December 9 | 65°F | 39°F | 16% | 11% | 10 h |
| December 10 | 65°F | 39°F | 16% | 11% | 10 h |
| December 11 | 65°F | 39°F | 16% | 11% | 10 h |
| December 12 | 65°F | 39°F | 16% | 11% | 10 h |
| December 13 | 65°F | 39°F | 16% | 11% | 10 h |
| December 14 | 65°F | 39°F | 17% | 11% | 10 h |
| December 15 | 64°F | 39°F | 17% | 11% | 10 h |
| December 16 | 64°F | 39°F | 17% | 11% | 10 h |
| December 17 | 64°F | 39°F | 17% | 11% | 9 h 50 min |
| December 18 | 64°F | 39°F | 17% | 12% | 9 h 50 min |
| December 19 | 64°F | 39°F | 17% | 12% | 9 h 50 min |
| December 20 | 64°F | 39°F | 17% | 12% | 9 h 50 min |
| December 21 | 64°F | 39°F | 17% | 12% | 9 h 50 min |
| December 22 | 64°F | 39°F | 17% | 12% | 9 h 50 min |
| December 23 | 64°F | 39°F | 17% | 12% | 9 h 50 min |
| December 24 | 65°F | 39°F | 18% | 12% | 9 h 50 min |
| December 25 | 65°F | 39°F | 18% | 12% | 9 h 50 min |
| December 26 | 65°F | 39°F | 18% | 12% | 9 h 50 min |
| December 27 | 65°F | 39°F | 18% | 12% | 9 h 50 min |
| December 28 | 65°F | 39°F | 18% | 12% | 10 h |
| December 29 | 65°F | 39°F | 18% | 12% | 10 h |
| December 30 | 65°F | 39°F | 18% | 12% | 10 h |
| December 31 | 65°F | 39°F | 18% | 12% | 10 h |
- Normal high
- 65°FDecember average
- Normal low
- 39°FDecember average
- Precipitation
- 1.87 inmonth total
- Days with precipitation
- 50.01 inch or more
- Nights at 32°F or colder
- 7
- Daylight
- 10 h 10 min to 10 hDecember 1 to December 31
- Days at 70°F or more
- 12
- Days at 80°F or more
- 2
- Sunshine
- 85%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00047813; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in San Jacinto in December?
On a given December day the chance of 0.01 inch or more is 16% on average, highest around December 31 (18%). In all, 1.87 in falls on 5 days of a normal December, 1 of them with an inch or more.
In a normal December in San Jacinto, 7 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00047813.
What are the records for December in San Jacinto?
The December mean against the 1991-2020 normal of 52.0°F: 2021 52.4°F (+0.4), 2022 52.9°F (+0.9), 2023 56.6°F (+4.6), 2024 57.0°F (+5.0), 2025 59.7°F (+7.7). 5 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 52.4°F | +0.4°F | 4.51 in |
| 2022 | 52.9°F | +0.9°F | 1.21 in |
| 2023 | 56.6°F | +4.6°F | 0.66 in |
| 2024 | 57.0°F | +5.0°F | 0.00 in |
| 2025 | 59.7°F | +7.7°F | 1.69 in |
Source: recent months: ACIS, station USC00047813. Records and recent months use complete months only.
How does December in San Jacinto 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; San Jacinto's is 65°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- San Jacinto in November73°F by day, 44°F at night
- San Jacinto in January66°F by day, 40°F at night
- San Jacinto 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