El Cajon weather in December: El Cajon, California: normal highs, lows, rain and records for December
El Cajon in December has a normal high of 69°F and a normal low of 42°F, a daily mean of 55°F, falling from 71°F on the 1st to 68°F by the 31st. Measurable precipitation falls on 6 days in a normal December, 1.83 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 20°C and low of 5°C, 46 mm of precipitation in December.
- NOAA stationEl Cajon
- Station IDUSC00042706
- Location32.80°N 116.93°W
- Elevation495 ft (151 m)
- From the center2 miles
- Population103,291
- Jan 69° 43°
- Feb 69° 44°
- Mar 71° 48°
- Apr 75° 51°
- May 76° 56°
- Jun 81° 59°
- Jul 86° 63°
- Aug 89° 65°
- Sep 87° 62°
- Oct 81° 56°
- Nov 75° 47°
- Dec 69° 42°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is El Cajon in December?
The normal high is 69°F and the normal low 42°F, for a daily mean of 55.1°F. December is 6.1°F cooler than November and 0.8°F cooler than January. December is the 12th warmest month of the year in El Cajon and the 4th wettest. Across the month the normal high falls 3°F, from 71°F on December 1 to 68°F on December 31. From one year to the next December's mean temperature typically moves about 1.8°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 53°F and 57°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 | 71°F | 43°F | 15% | 10% |
| December 8 | 69°F | 42°F | 17% | 11% |
| December 15 | 68°F | 41°F | 18% | 12% |
| December 22 | 68°F | 41°F | 18% | 13% |
| December 31 | 68°F | 42°F | 18% | 14% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 16)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 71°F | 43°F | 15% | 10% | 10 h 10 min |
| December 2 | 71°F | 43°F | 16% | 10% | 10 h 10 min |
| December 3 | 70°F | 43°F | 16% | 11% | 10 h 10 min |
| December 4 | 70°F | 43°F | 16% | 11% | 10 h 10 min |
| December 5 | 70°F | 42°F | 16% | 11% | 10 h 10 min |
| December 6 | 70°F | 42°F | 17% | 11% | 10 h 10 min |
| December 7 | 69°F | 42°F | 17% | 11% | 10 h |
| December 8 | 69°F | 42°F | 17% | 11% | 10 h |
| December 9 | 69°F | 42°F | 17% | 12% | 10 h |
| December 10 | 69°F | 42°F | 17% | 12% | 10 h |
| December 11 | 69°F | 42°F | 17% | 12% | 10 h |
| December 12 | 68°F | 42°F | 18% | 12% | 10 h |
| December 13 | 68°F | 42°F | 18% | 12% | 10 h |
| December 14 | 68°F | 41°F | 18% | 12% | 10 h |
| December 15 | 68°F | 41°F | 18% | 12% | 10 h |
| December 16 | 68°F | 41°F | 18% | 13% | 10 h |
| December 17 | 68°F | 41°F | 18% | 13% | 10 h |
| December 18 | 68°F | 41°F | 18% | 13% | 10 h |
| December 19 | 68°F | 41°F | 18% | 13% | 10 h |
| December 20 | 68°F | 41°F | 18% | 13% | 10 h |
| December 21 | 68°F | 41°F | 18% | 13% | 10 h |
| December 22 | 68°F | 41°F | 18% | 13% | 10 h |
| December 23 | 68°F | 41°F | 18% | 13% | 10 h |
| December 24 | 68°F | 41°F | 18% | 13% | 10 h |
| December 25 | 68°F | 41°F | 18% | 13% | 10 h |
| December 26 | 68°F | 41°F | 18% | 13% | 10 h |
| December 27 | 68°F | 42°F | 18% | 13% | 10 h |
| December 28 | 68°F | 42°F | 18% | 13% | 10 h |
| December 29 | 68°F | 42°F | 18% | 14% | 10 h |
| December 30 | 68°F | 42°F | 18% | 14% | 10 h |
| December 31 | 68°F | 42°F | 18% | 14% | 10 h |
- Normal high
- 69°FDecember average
- Normal low
- 42°FDecember average
- Precipitation
- 1.83 inmonth total
- Days with precipitation
- 60.01 inch or more
- Nights at 32°F or colder
- 1
- Daylight
- 10 h 10 min to 10 hDecember 1 to December 31
- Days at 70°F or more
- 14
- Days at 80°F or more
- 3
- Sunshine
- 84%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00042706; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in El Cajon in December?
On a given December day the chance of 0.01 inch or more is 18% on average, highest around December 22 (18%). In all, 1.83 in falls on 6 days of a normal December, 1 of them with an inch or more.
In a normal December in El Cajon, 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00042706.
What are the records for December in El Cajon?
The warmest December temperature on El Cajon's official record (since 1899) is 95°F, on December 30, 1917; the coldest is 21°F, on December 29, 1954. The wettest December brought 11.68 in (1921).
The December mean against the 1991-2020 normal of 55.1°F: 2021 55.0°F (−0.1), 2022 54.7°F (−0.4), 2023 57.8°F (+2.7), 2024 57.1°F (+2.0), 2025 59.8°F (+4.7). 3 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 55.0°F | −0.1°F | 4.24 in |
| 2022 | 54.7°F | −0.4°F | 1.73 in |
| 2023 | 57.8°F | +2.7°F | 0.67 in |
| 2024 | 57.1°F | +2.0°F | 0.07 in |
| 2025 | 59.8°F | +4.7°F | 1.63 in |
Source: records: ACIS, NWS threaded record ELJC1thr; recent months: ACIS, station USC00042706. Records and recent months use complete months only.
How does December in El Cajon 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; El Cajon's is 69°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.