Tracy, CA weather in December
December in Tracy: cool, with frequent rain. Highs 57°F, lows 38°F, rain on about 11 days. It is one of the coolest months in Tracy.
- Normal high
- 57°F
- Normal low
- 38°F
- Wet days
- 11
- 2.4 in total
- Muggy days
- 0
- dew point 65°F+
How December changes from start to finish
| December 1 | December 31 | |
|---|---|---|
| Normal high | 60°F | 56°F |
| Normal low | 40°F | 38°F |
| Chance of a wet day | 33% | 40% |
| Sunrise / sunset | 7:02 am / 4:47 pm | 7:20 am / 4:56 pm |
| Daylight | 9.8 h | 9.6 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Pacific Time).
A typical December day
- 6 am41°Fdew point 38°F
- 9 am44°Fdew point 40°F
- Noon52°Fdew point 42°F
- 3 pm55°Fdew point 42°F
- 6 pm50°Fdew point 42°F
- 9 pm46°Fdew point 41°F
NOAA hourly normals (local standard time) from Stockton Metro Airport (15 mi away); average wind 7 mph; clear or few clouds in 57% of daytime hours, mostly cloudy or overcast in 39%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F2 of 31
- Hot dayshigh 90°F or more0 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow11 of 31
- Notable rainat least 0.10 in6 of 31
- Freezing nightslow 32°F or below8 of 31
Average days per December, counted from daily records for each year 1991-2020.
Rain in December
Normal precipitation is 2.4 in; a dry December brings about 1.4 in and a wet one about 3.6 in (25th and 75th percentiles). About 1 day brings half an inch or more. Snow is very rare.
How December varies from year to year
- Warmest December, 1991-20202017: average high 62°F
- Coolest December1994: average high 51°F
- Wettest December2014: 6.4 in
- Driest December2017: 0.06 in
- Highest reading76°F (December 7, 2020)
- Lowest reading20°F (December 24, 1998)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
December compared with November and January
| November | December | January | |
|---|---|---|---|
| Normal high | 67°F | 57°F | 57°F |
| Normal low | 43°F | 38°F | 39°F |
| Wet days | 7 | 11 | 13 |
| Comfortable days | 16 | 2 | 3 |
| Daylight | 10.2 h | 9.6 h | 9.9 h |
Highs change by -10°F from November and 0°F into January.
Nearby alternatives in December
- Warmer: Santa Maria, CA200 mi · high 64°F · 7 wet days
- Drier: Salinas, CA74 mi · high 62°F · 8 wet days
- Cooler: Yosemite Valley, CA101 mi · high 46°F · 9 wet days
How Tracy ranks in December
- Normal high144th warmest of 378 cities; 46th of 60 in California
- Wet days280th driest of 378
- Comfortable days171st most of 340
What to pack for Tracy in December
- A warm jacket – lows near 38°F, highs near 57°F
- A rain jacket or umbrella – rain on about 11 days
Frost in December
The first fall frost typically comes around Dec 10; in 1 year in 10 it comes before Nov 26. All frost dates for Tracy.
Heating and cooling
December has 535 heating degree days and 0 cooling degree days (base 65°F), 14% of the year's total heating and cooling demand.
Questions
How cold is Tracy in December?
The normal high is 57°F and the normal low is 38°F. From 1991 to 2020 the coldest December reading was 20°F (December 24, 1998).
Does it rain a lot in Tracy in December?
About 11 days in December have at least 0.01 in of precipitation, and the normal total is 2.4 in. The wettest December in 1991-2020 was in 2014 (6.4 in); the driest was in 2017 (0.06 in).
Does it snow in Tracy in December?
Snow is very rare: the 1991-2020 normal for December rounds to 0.0 in.
Is December a good time to visit Tracy?
December ranks 11th of 12 months on our comfort score for Tracy (44 out of 100). It has about 2 comfortable days. The best month is April.
Where the numbers come from
- Temperature, humidity and wind by hour and cloud cover: Stockton Metro Airport (USW00023237), 15 mi NE of the city center, 26 ft . NOAA normals and daily records, 1991-2020.
- Rain, snowfall, snow depth and frost dates: Tracy Pumping Plt (USC00049001), 9.5 mi WNW of the city center, 61 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Stockton Metropolitan Airport (724920-23237), 15 mi NE of the city center, 27 ft . Hourly observations, 1991-2020.