Santa Rosa, CA weather in January
January in Santa Rosa: cool, with frequent rain. Highs 58°F, lows 37°F, rain on about 13 days. It is one of the coolest months in Santa Rosa.
- Normal high
- 58°F
- Normal low
- 37°F
- Wet days
- 13
- 7.9 in total
- Muggy days
- 0
- dew point 65°F+
How January changes from start to finish
| January 1 | January 31 | |
|---|---|---|
| Normal high | 57°F | 60°F |
| Normal low | 37°F | 38°F |
| Chance of a wet day | 43% | 42% |
| Sunrise / sunset | 7:28 am / 5:00 pm | 7:16 am / 5:31 pm |
| Daylight | 9.5 h | 10.2 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 (44 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°F7 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 snow13 of 31
- Notable rainat least 0.10 in9 of 31
- Freezing nightslow 32°F or below11 of 31
Average days per January, counted from daily records for each year 1991-2020.
Rain in January
Normal precipitation is 7.9 in; a dry January brings about 2.7 in and a wet one about 12.7 in (25th and 75th percentiles). About 5 days bring half an inch or more, and about 3 an inch or more. Snow is very rare.
How January varies from year to year
- Warmest January, 1991-20202014: average high 71°F
- Coolest January2008: average high 55°F
- Wettest January1995: 23.6 in
- Driest January2014: 0.1 in
- Highest reading84°F (January 13, 2009)
- Lowest reading19°F (January 14, 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 | 58°F | 58°F | 62°F |
| Normal low | 37°F | 37°F | 39°F |
| Wet days | 13 | 13 | 12 |
| Comfortable days | 5 | 7 | 12 |
| Daylight | 9.5 h | 9.8 h | 10.8 h |
Highs change by 0°F from December and +4°F into February.
Nearby alternatives in January
- Drier: Concord, CA49 mi · high 56°F · 10 wet days
- Cooler: South Lake Tahoe, CA151 mi · high 43°F · 10 wet days
How Santa Rosa ranks in January
- Normal high127th warmest of 378 cities; 44th of 60 in California
- Wet days329th driest of 378
- Comfortable days112th most of 339
What to pack for Santa Rosa in January
- A warm jacket – lows near 37°F, highs near 58°F
- A rain jacket or umbrella – rain on about 13 days
Heating and cooling
January has 538 heating degree days and 0 cooling degree days (base 65°F), 17% of the year's total heating and cooling demand.
Questions
How cold is Santa Rosa in January?
The normal high is 58°F and the normal low is 37°F. From 1991 to 2020 the coldest January reading was 19°F (January 14, 2007).
Does it rain a lot in Santa Rosa in January?
About 13 days in January have at least 0.01 in of precipitation, and the normal total is 7.9 in. The wettest January in 1991-2020 was in 1995 (23.6 in); the driest was in 2014 (0.1 in).
Does it snow in Santa Rosa in January?
Snow is very rare: the 1991-2020 normal for January rounds to 0.0 in.
Is January a good time to visit Santa Rosa?
January ranks 11th of 12 months on our comfort score for Santa Rosa (49 out of 100). It has about 7 comfortable days. The best months are April and May.
Where the numbers come from
- Temperature and rain: Graton (USC00043578), 8.2 mi W of the city center, 200 ft . NOAA normals and daily records, 1991-2020.
- Snowfall, snow depth and frost dates: Santa Rosa (USC00047965), 1.1 mi N of the city center, 166 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Travis AFB (USW00023202), 44 mi ESE of the city center, 59 ft (106 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Sonoma County Airport (724957-23213), 6.8 mi NW of the city center, 119 ft . Hourly observations, 1991-2020.