Fairfield weather in January: Fairfield, California: normal highs, lows, rain and records for January
Fairfield in January has a normal high of 57°F and a normal low of 40°F, a daily mean of 49°F, rising from 55°F on the 1st to 59°F by the 31st. Measurable precipitation falls on 10 days in a normal January, 4.68 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 14°C and low of 5°C, 119 mm of precipitation in January.
- NOAA stationFairfield
- Station IDUSC00042934
- Location38.27°N 122.07°W
- Elevation40 ft (12 m)
- Population122,646
- Jan 57° 40°
- Feb 62° 43°
- Mar 66° 45°
- Apr 71° 48°
- May 78° 52°
- Jun 85° 56°
- Jul 90° 58°
- Aug 89° 58°
- Sep 87° 57°
- Oct 78° 52°
- Nov 66° 45°
- Dec 57° 40°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Fairfield in January?
The normal high is 57°F and the normal low 40°F, for a daily mean of 48.5°F. January is 0.1°F warmer than December and 3.7°F cooler than February. January is the 11th warmest month of the year in Fairfield and the 3rd wettest. Across the month the normal high rises 4°F, from 55°F on January 1 to 59°F on January 31. From one year to the next January's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Januarys in three average between 46°F and 51°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 33%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| January 1 | 55°F | 40°F | 33% | 24% |
| January 8 | 56°F | 40°F | 33% | 24% |
| January 15 | 56°F | 40°F | 33% | 24% |
| January 22 | 57°F | 41°F | 33% | 25% |
| January 31 | 59°F | 42°F | 33% | 25% |
Every day of January: normal high, low and chance of precipitation (warmest afternoon January 31, coldest night January 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| January 1 | 55°F | 40°F | 33% | 24% | 9 h 30 min |
| January 2 | 55°F | 40°F | 33% | 24% | 9 h 30 min |
| January 3 | 55°F | 40°F | 33% | 24% | 9 h 30 min |
| January 4 | 56°F | 40°F | 33% | 24% | 9 h 30 min |
| January 5 | 56°F | 40°F | 33% | 24% | 9 h 40 min |
| January 6 | 56°F | 40°F | 33% | 24% | 9 h 40 min |
| January 7 | 56°F | 40°F | 33% | 24% | 9 h 40 min |
| January 8 | 56°F | 40°F | 33% | 24% | 9 h 40 min |
| January 9 | 56°F | 40°F | 33% | 24% | 9 h 40 min |
| January 10 | 56°F | 40°F | 33% | 24% | 9 h 40 min |
| January 11 | 56°F | 40°F | 33% | 24% | 9 h 40 min |
| January 12 | 56°F | 40°F | 33% | 24% | 9 h 40 min |
| January 13 | 56°F | 40°F | 33% | 24% | 9 h 40 min |
| January 14 | 56°F | 40°F | 33% | 24% | 9 h 50 min |
| January 15 | 56°F | 40°F | 33% | 24% | 9 h 50 min |
| January 16 | 56°F | 40°F | 33% | 24% | 9 h 50 min |
| January 17 | 57°F | 40°F | 33% | 24% | 9 h 50 min |
| January 18 | 57°F | 41°F | 33% | 24% | 9 h 50 min |
| January 19 | 57°F | 41°F | 33% | 24% | 9 h 50 min |
| January 20 | 57°F | 41°F | 33% | 25% | 9 h 50 min |
| January 21 | 57°F | 41°F | 33% | 25% | 10 h |
| January 22 | 57°F | 41°F | 33% | 25% | 10 h |
| January 23 | 57°F | 41°F | 33% | 25% | 10 h |
| January 24 | 57°F | 41°F | 33% | 25% | 10 h |
| January 25 | 58°F | 41°F | 33% | 25% | 10 h |
| January 26 | 58°F | 41°F | 33% | 25% | 10 h |
| January 27 | 58°F | 41°F | 33% | 25% | 10 h 10 min |
| January 28 | 58°F | 41°F | 33% | 25% | 10 h 10 min |
| January 29 | 58°F | 41°F | 33% | 25% | 10 h 10 min |
| January 30 | 59°F | 41°F | 33% | 25% | 10 h 10 min |
| January 31 | 59°F | 42°F | 33% | 25% | 10 h 10 min |
- Normal high
- 57°FJanuary average
- Normal low
- 40°FJanuary average
- Precipitation
- 4.68 inmonth total
- Days with precipitation
- 100.01 inch or more
- Nights at 32°F or colder
- 3
- Daylight
- 9 h 30 min to 10 h 10 minJanuary 1 to January 31
- Days at 70°F or more
- 1
- Sunshine
- 74%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00042934; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Fairfield in January?
On a given January day the chance of 0.01 inch or more is 33% on average, highest around January 27 (33%). In all, 4.68 in falls on 10 days of a normal January, 1 of them with an inch or more.
In a normal January in Fairfield, 3 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00042934.
What are the records for January in Fairfield?
The warmest January temperature on this station's record (since 1950) is 78°F, on January 18, 2021; the coldest is 18°F, on January 1, 1979. The wettest January brought 13.87 in (2017).
The January mean against the 1991-2020 normal of 48.5°F: 2021 51.1°F (+2.6), 2022 50.8°F (+2.3), 2023 50.1°F (+1.6), 2024 52.3°F (+3.8), 2025 49.7°F (+1.2). 5 of 5 ran warmer than normal.
| January | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 51.1°F | +2.6°F | 4.02 in |
| 2022 | 50.8°F | +2.3°F | 0.53 in |
| 2023 | 50.1°F | +1.6°F | 11.10 in |
| 2024 | 52.3°F | +3.8°F | 4.36 in |
| 2025 | 49.7°F | +1.2°F | 0.27 in |
Source: records: ACIS, station USC00042934; recent months: ACIS, station USC00042934. Records and recent months use complete months only.
How does January in Fairfield compare across California?
Across the 219 places PlainClimate covers in California, January normal highs run from 37°F in Tahoma to 72°F in Brawley; Fairfield's is 57°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.