Antioch, CA weather in December
Expect cool weather with some rain in Antioch in December, with highs near 56°F and lows near 40°F. Rain falls on about 9 days. It is one of the coolest months in Antioch.
- Normal high
- 56°F
- Normal low
- 40°F
- Wet days
- 9
- 3.5 in total
- Muggy days
- 0
- dew point 65°F+
How December changes from start to finish
| December 1 | December 31 | |
|---|---|---|
| Normal high | 59°F | 55°F |
| Normal low | 42°F | 40°F |
| Chance of a wet day | 27% | 31% |
| Sunrise / sunset | 7:04 am / 4:48 pm | 7:23 am / 4:57 pm |
| Daylight | 9.7 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 am45°Fdew point 41°F
- Noon54°Fdew point 42°F
- 3 pm56°Fdew point 41°F
- 6 pm48°Fdew point 41°F
- 9 pm45°Fdew point 40°F
NOAA hourly normals (local standard time) from Travis AFB (19 mi away); average wind 7 mph; clear or few clouds in 48% of daytime hours, mostly cloudy or overcast in 45%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F3 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 snow9 of 31
- Notable rainat least 0.10 in7 of 31
- Freezing nightslow 32°F or below3 of 31
Average days per December, counted from daily records for each year 1991-2020.
Rain in December
Normal precipitation is 3.5 in; a dry December brings about 1.8 in and a wet one about 5.5 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 1 an inch or more. Snow is very rare.
How December varies from year to year
- Warmest December, 1991-20202011: average high 64°F
- Coolest December2008: average high 53°F
- Wettest December2005: 11.8 in
- Driest December2017: 0.05 in
- Highest reading75°F (December 2, 2011)
- Lowest reading22°F (December 23, 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 | 65°F | 56°F | 56°F |
| Normal low | 46°F | 40°F | 40°F |
| Wet days | 6 | 9 | 10 |
| Comfortable days | 16 | 3 | 3 |
| Daylight | 10.1 h | 9.6 h | 9.9 h |
Highs change by -9°F from November and 0°F into January.
Nearby alternatives in December
- Warmer: Salinas, CA92 mi · high 62°F · 8 wet days
- Drier: Bakersfield, CA239 mi · high 59°F · 6 wet days
- Cooler: South Lake Tahoe, CA118 mi · high 43°F · 11 wet days
How Antioch ranks in December
- Normal high157th warmest of 378 cities; 54th of 60 in California
- Wet days168th driest of 378
- Comfortable days161st most of 340
What to pack for Antioch in December
- A warm jacket – lows near 40°F, highs near 56°F
- A rain jacket or umbrella – rain on about 9 days
Frost in December
The first fall frost typically comes around Dec 19; in 1 year in 10 it comes before Nov 29. All frost dates for Antioch.
Heating and cooling
December has 524 heating degree days and 0 cooling degree days (base 65°F), 15% of the year's total heating and cooling demand.
Questions
How cold is Antioch in December?
The normal high is 56°F and the normal low is 40°F. From 1991 to 2020 the coldest December reading was 22°F (December 23, 1998).
Does it rain a lot in Antioch in December?
About 9 days in December have at least 0.01 in of precipitation, and the normal total is 3.6 in. The wettest December in 1991-2020 was in 2005 (11.8 in); the driest was in 2017 (0.05 in).
Does it snow in Antioch in December?
Snow is very rare: the 1991-2020 normal for December rounds to 0.0 in.
Is December a good time to visit Antioch?
December ranks 12th of 12 months on our comfort score for Antioch (44 out of 100). It has about 3 comfortable days. The best months are April and May.
Where the numbers come from
- Temperature and frost dates: Antioch Pumping Plt #3 (USC00040232), 3.3 mi ESE of the city center, 60 ft . NOAA normals and daily records, 1991-2020.
- Rain: Concord Wwtp (USC00041967), 14 mi W of the city center, 40 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Fairfield (USC00042934), 23 mi NW of the city center, 40 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Travis AFB (USW00023202), 19 mi NNW of the city center, 59 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Travis Air Force Base (745160-23202), 19 mi NNW of the city center, 62 ft . Hourly observations, 1991-2020.