Fairfield, CA weather in January
Expect cool weather with frequent rain in Fairfield in January, with highs near 57°F and lows near 40°F. Rain falls on about 10 days. It is one of the coolest months in Fairfield.
- Normal high
- 57°F
- Normal low
- 40°F
- Wet days
- 10
- 4.7 in total
- Muggy days
- 0
- dew point 65°F+
How January changes from start to finish
| January 1 | January 31 | |
|---|---|---|
| Normal high | 55°F | 59°F |
| Normal low | 40°F | 42°F |
| Chance of a wet day | 33% | 33% |
| Sunrise / sunset | 7:24 am / 4:58 pm | 7:13 am / 5:29 pm |
| Daylight | 9.6 h | 10.3 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 January day
- 6 am42°Fdew point 39°F
- 9 am45°Fdew point 41°F
- Noon53°Fdew point 43°F
- 3 pm56°Fdew point 43°F
- 6 pm49°Fdew point 43°F
- 9 pm46°Fdew point 42°F
NOAA hourly normals (local standard time) from Travis AFB (6 mi away); average wind 7 mph; clear or few clouds in 47% of daytime hours, mostly cloudy or overcast in 47%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F4 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 snow10 of 31
- Notable rainat least 0.10 in8 of 31
- Freezing nightslow 32°F or below3 of 31
Average days per January, counted from daily records for each year 1991-2020.
Rain in January
Normal precipitation is 4.7 in; a dry January brings about 1.6 in and a wet one about 8.2 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 January varies from year to year
- Warmest January, 1991-20202014: average high 68°F
- Coolest January2005: average high 51°F
- Wettest January2017: 13.9 in
- Driest January2015: 0.01 in
- Highest reading77°F (January 31, 2015)
- Lowest reading23°F (January 15, 2007)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
January compared with December and February
| December | January | February | |
|---|---|---|---|
| Normal high | 57°F | 57°F | 62°F |
| Normal low | 40°F | 40°F | 43°F |
| Wet days | 10 | 10 | 10 |
| Comfortable days | 3 | 4 | 10 |
| Daylight | 9.6 h | 9.8 h | 10.8 h |
Highs change by 0°F from December and +5°F into February.
Nearby alternatives in January
- Warmer: Salinas, CA111 mi · high 62°F · 9 wet days
- Drier: Reno, NV149 mi · high 48°F · 7 wet days
- Cooler: South Lake Tahoe, CA121 mi · high 43°F · 10 wet days
How Fairfield ranks in January
- Normal high140th warmest of 378 cities; 49th of 60 in California
- Wet days234th driest of 378
- Comfortable days153rd most of 339
What to pack for Fairfield in January
- A warm jacket – lows near 40°F, highs near 57°F
- A rain jacket or umbrella – rain on about 10 days
Frost in January
The last spring frost typically comes around Jan 15; in 1 year in 10 it comes after Feb 16. All frost dates for Fairfield.
Heating and cooling
January has 512 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 Fairfield in January?
The normal high is 57°F and the normal low is 40°F. From 1991 to 2020 the coldest January reading was 23°F (January 15, 2007).
Does it rain a lot in Fairfield in January?
About 10 days in January have at least 0.01 in of precipitation, and the normal total is 4.7 in. The wettest January in 1991-2020 was in 2017 (13.9 in); the driest was in 2015 (0.01 in).
Does it snow in Fairfield in January?
Snow is very rare: the 1991-2020 normal for January rounds to 0.0 in.
Is January a good time to visit Fairfield?
January ranks 11th of 12 months on our comfort score for Fairfield (46 out of 100). It has about 4 comfortable days. The best months are April and May.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: Fairfield (USC00042934), 2.3 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), 5.9 mi ENE of the city center, 59 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Travis Air Force Base (745160-23202), 5.9 mi ENE of the city center, 62 ft . Hourly observations, 1991-2020.