Tustin weather in December: Tustin, California: normal highs, lows, rain and records for December
Tustin in December has a normal high of 70°F and a normal low of 43°F, a daily mean of 56°F, falling from 72°F on the 1st to 69°F by the 31st. Measurable precipitation falls on 5 days in a normal December, 2.25 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 21°C and low of 6°C, 57 mm of precipitation in December.
- NOAA stationTustin Irvine Ranch
- Station IDUSC00049087
- Location33.70°N 117.75°W
- Elevation235 ft (72 m)
- From the center4 miles
- Population78,863
- Jan 68° 43°
- Feb 69° 45°
- Mar 72° 48°
- Apr 74° 50°
- May 77° 55°
- Jun 80° 58°
- Jul 85° 61°
- Aug 87° 63°
- Sep 87° 61°
- Oct 84° 55°
- Nov 76° 47°
- Dec 70° 43°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Tustin in December?
The normal high is 70°F and the normal low 43°F, for a daily mean of 56.3°F. December is 5.3°F cooler than November and 0.7°F warmer than January. December is the 11th warmest month of the year in Tustin and the 3rd wettest. Across the month the normal high falls 3°F, from 72°F on December 1 to 69°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 54°F and 59°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 19%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 72°F | 44°F | 12% | 10% |
| December 8 | 71°F | 43°F | 14% | 11% |
| December 15 | 70°F | 43°F | 15% | 12% |
| December 22 | 69°F | 43°F | 17% | 14% |
| December 31 | 69°F | 43°F | 19% | 16% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 14)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 72°F | 44°F | 12% | 10% | 10 h 10 min |
| December 2 | 72°F | 44°F | 13% | 10% | 10 h |
| December 3 | 72°F | 44°F | 13% | 11% | 10 h |
| December 4 | 71°F | 43°F | 13% | 11% | 10 h |
| December 5 | 71°F | 43°F | 13% | 11% | 10 h |
| December 6 | 71°F | 43°F | 13% | 11% | 10 h |
| December 7 | 71°F | 43°F | 14% | 11% | 10 h |
| December 8 | 71°F | 43°F | 14% | 11% | 10 h |
| December 9 | 71°F | 43°F | 14% | 11% | 10 h |
| December 10 | 70°F | 43°F | 14% | 12% | 10 h |
| December 11 | 70°F | 43°F | 15% | 12% | 10 h |
| December 12 | 70°F | 43°F | 15% | 12% | 10 h |
| December 13 | 70°F | 43°F | 15% | 12% | 10 h |
| December 14 | 70°F | 43°F | 15% | 12% | 10 h |
| December 15 | 70°F | 43°F | 15% | 12% | 10 h |
| December 16 | 70°F | 43°F | 16% | 13% | 10 h |
| December 17 | 70°F | 43°F | 16% | 13% | 10 h |
| December 18 | 70°F | 43°F | 16% | 13% | 10 h |
| December 19 | 69°F | 43°F | 16% | 13% | 9 h 50 min |
| December 20 | 69°F | 43°F | 17% | 13% | 9 h 50 min |
| December 21 | 69°F | 43°F | 17% | 14% | 9 h 50 min |
| December 22 | 69°F | 43°F | 17% | 14% | 9 h 50 min |
| December 23 | 69°F | 43°F | 17% | 14% | 9 h 50 min |
| December 24 | 69°F | 43°F | 17% | 14% | 9 h 50 min |
| December 25 | 69°F | 43°F | 18% | 14% | 9 h 50 min |
| December 26 | 69°F | 43°F | 18% | 15% | 10 h |
| December 27 | 69°F | 43°F | 18% | 15% | 10 h |
| December 28 | 69°F | 43°F | 18% | 15% | 10 h |
| December 29 | 69°F | 43°F | 19% | 15% | 10 h |
| December 30 | 69°F | 43°F | 19% | 16% | 10 h |
| December 31 | 69°F | 43°F | 19% | 16% | 10 h |
- Normal high
- 70°FDecember average
- Normal low
- 43°FDecember average
- Precipitation
- 2.25 inmonth total
- Days with precipitation
- 50.01 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
- 2
- Sunshine
- 83%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00049087; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Tustin in December?
On a given December day the chance of 0.01 inch or more is 16% on average, highest around December 31 (19%). In all, 2.25 in falls on 5 days of a normal December.
In a normal December in Tustin, 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00049087.
What are the records for December in Tustin?
The warmest December temperature on this station's record (since 1915) is 97°F, on December 30, 1980; the coldest is 23°F, on December 26, 1924. The wettest December brought 7.35 in (1938).
Source: records: ACIS, station USC00049087. Records and recent months use complete months only.
How does December in Tustin 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; Tustin's is 70°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.