Ukiah weather in January
In January, Ukiah sees average daytime highs of 54°F and overnight lows near 37°F, with 7.2 in of precipitation across 12.4 wet days and about 9.6 hours of daylight. It is the 11th-warmest and 2nd-wettest month of the year here.
Highs climb over the month, from about 52°F in the first days to 55°F by the end. The sky is clear or mostly clear about 29% of the time in January, and the air most often feels dry.
Daylight stretches from about 9 h 18 min at the start of January to 9 h 54 min by month's end. Set against the rest of the year, January is Ukiah's 12th-clearest and 7th-windiest month. For the whole year in context, see Ukiah's year-round climate.
- Daytime high
- 54°
- 11th warmest
- Overnight low
- 37°
- 2nd coldest
- Precipitation
- 7.2 in
- 12.4 wet days
- Daylight
- 9 h 30 min
- 7:36 AM – 5:08 PM
- Cloud cover
- 64%
- 12th clearest
- Wind
- 4 mph
- 7th windiest
- Solar energy
- 2.1 kWh/m²
- Travel score
- 3.0
- out of 10
Ukiah is city in and county seat of Mendocino County, California, United States.
- Density
- 1,301/km²
- people per km²
- Founded
- 1876
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in January
Highs climb over the month, from about 52°F in the first days to 55°F by the end.
A typical January day in Ukiah reaches about 54°F in the afternoon and slips back to 37°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 46°F and 63°F. Set against its neighbours, January runs on par with December and about 2°F cooler than February.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 52 | 52 | 52 | 52 | 53 | 53 | 53 | 53 | 53 | 53 | 53 | 53 | 53 | 53 | 54 | 54 | 54 | 54 | 54 | 54 | 54 | 54 | 55 | 55 | 55 | 55 | 55 | 55 | 55 | 55 | 56 |
| Avg low (°F) | 35 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 52 | 35 |
| 2 | 52 | 36 |
| 3 | 52 | 36 |
| 4 | 52 | 36 |
| 5 | 53 | 36 |
| 6 | 53 | 36 |
| 7 | 53 | 36 |
| 8 | 53 | 36 |
| 9 | 53 | 36 |
| 10 | 53 | 36 |
| 11 | 53 | 37 |
| 12 | 53 | 37 |
| 13 | 53 | 37 |
| 14 | 53 | 37 |
| 15 | 54 | 37 |
| 16 | 54 | 37 |
| 17 | 54 | 37 |
| 18 | 54 | 37 |
| 19 | 54 | 37 |
| 20 | 54 | 37 |
| 21 | 54 | 37 |
| 22 | 54 | 37 |
| 23 | 55 | 37 |
| 24 | 55 | 37 |
| 25 | 55 | 37 |
| 26 | 55 | 37 |
| 27 | 55 | 37 |
| 28 | 55 | 37 |
| 29 | 55 | 37 |
| 30 | 55 | 37 |
| 31 | 56 | 37 |
How January really feels in Ukiah
Once humidity and wind are folded in, January averages 0 days that feel above 90°F and 1 that feel at or below 32°F — the comfort signal a plain temperature reading hides.
The story in January is cold — wind chill drags the overnight "feels like" below the raw low.
Ukiah weather by month
How January compares with the rest of the year at a glance. January is the 11th-warmest and 2nd-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 54° / 37° | 7.2 | 12.4 | 1.9 | 9.6 | 3.0 |
| Feb | 56° / 38° | 6.7 | 10.8 | 2.3 | 10.5 | 3.6 |
| Mar | 59° / 40° | 6.0 | 11.8 | 2 | 11.7 | 4.5 |
| Apr | 63° / 42° | 3.1 | 8.3 | 0.5 | 13 | 5.9 |
| May | 70° / 47° | 1.9 | 5.4 | 0 | 14.1 | 7.5 |
| Jun | 78° / 53° | 0.6 | 2.2 | 0 | 14.7 | 8.6 |
| Jul | 85° / 57° | 0.0 | 0.3 | 0 | 14.5 | 7.1 |
| Aug | 85° / 57° | 0.1 | 0.4 | 0 | 13.5 | 7.2 |
| Sep | 82° / 54° | 0.3 | 1.4 | 0 | 12.3 | 8.3 |
| Oct | 73° / 47° | 2.2 | 4.6 | 0 | 11 | 8.1 |
| Nov | 60° / 40° | 4.3 | 8.5 | 0.3 | 9.9 | 5.0 |
| Dec | 53° / 36° | 7.8 | 12.2 | 1.3 | 9.3 | 2.9 |
Cloud cover in January
The sky is clear or mostly clear about 29% of the time in January, the cloudiest month of the year.
Beyond those clear spells, partly cloudy skies cover about 10% of January, with mostly cloudy or overcast conditions the remaining 61%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 38 | 37 | 36 | 36 | 37 | 36 | 36 | 37 | 38 | 38 | 38 | 39 | 39 | 40 | 39 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 41 | 41 | 41 | 42 | 42 |
| Cloudier (%) | 62 | 63 | 64 | 64 | 63 | 64 | 64 | 63 | 62 | 62 | 62 | 61 | 61 | 60 | 61 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 59 | 59 | 59 | 58 | 58 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 38 | 62 |
| 2 | 37 | 63 |
| 3 | 36 | 64 |
| 4 | 36 | 64 |
| 5 | 37 | 63 |
| 6 | 36 | 64 |
| 7 | 36 | 64 |
| 8 | 37 | 63 |
| 9 | 38 | 62 |
| 10 | 38 | 62 |
| 11 | 38 | 62 |
| 12 | 39 | 61 |
| 13 | 39 | 61 |
| 14 | 40 | 60 |
| 15 | 39 | 61 |
| 16 | 40 | 60 |
| 17 | 40 | 60 |
| 18 | 40 | 60 |
| 19 | 40 | 60 |
| 20 | 40 | 60 |
| 21 | 40 | 60 |
| 22 | 40 | 60 |
| 23 | 40 | 60 |
| 24 | 40 | 60 |
| 25 | 40 | 60 |
| 26 | 40 | 60 |
| 27 | 41 | 59 |
| 28 | 41 | 59 |
| 29 | 41 | 59 |
| 30 | 42 | 58 |
| 31 | 42 | 58 |
Chance of precipitation in January
Ukiah gets around 7.2 in of rain and snow over 12.4 wet days in January. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 40% and peaks near 42% on the wettest days, and about 2 days bring snow.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 38 | 38 | 39 | 39 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 41 | 41 | 41 | 42 | 42 | 42 | 42 | 42 | 41 | 41 | 41 | 40 | 40 | 39 | 39 | 38 | 37 | 36 |
| Snow chance (%) | 8 | 8 | 8 | 8 | 7 | 7 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Rain chance (%) | Snow chance (%) | |
|---|---|---|
| 1 | 38 | 8 |
| 2 | 38 | 8 |
| 3 | 39 | 8 |
| 4 | 39 | 8 |
| 5 | 40 | 7 |
| 6 | 40 | 7 |
| 7 | 40 | 6 |
| 8 | 40 | 6 |
| 9 | 40 | 6 |
| 10 | 40 | 5 |
| 11 | 40 | 5 |
| 12 | 40 | 5 |
| 13 | 40 | 5 |
| 14 | 41 | 4 |
| 15 | 41 | 4 |
| 16 | 41 | 4 |
| 17 | 42 | 5 |
| 18 | 42 | 5 |
| 19 | 42 | 5 |
| 20 | 42 | 5 |
| 21 | 42 | 5 |
| 22 | 41 | 5 |
| 23 | 41 | 6 |
| 24 | 41 | 6 |
| 25 | 40 | 6 |
| 26 | 40 | 6 |
| 27 | 39 | 6 |
| 28 | 39 | 6 |
| 29 | 38 | 6 |
| 30 | 37 | 6 |
| 31 | 36 | 6 |
Humidity in January
Most of January feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, January lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Dry (%) | |
|---|---|
| 1 | 100 |
| 2 | 100 |
| 3 | 100 |
| 4 | 100 |
| 5 | 100 |
| 6 | 100 |
| 7 | 100 |
| 8 | 100 |
| 9 | 100 |
| 10 | 100 |
| 11 | 100 |
| 12 | 100 |
| 13 | 100 |
| 14 | 100 |
| 15 | 100 |
| 16 | 100 |
| 17 | 100 |
| 18 | 100 |
| 19 | 100 |
| 20 | 100 |
| 21 | 100 |
| 22 | 100 |
| 23 | 100 |
| 24 | 100 |
| 25 | 100 |
| 26 | 100 |
| 27 | 100 |
| 28 | 100 |
| 29 | 100 |
| 30 | 100 |
| 31 | 100 |
Wind in January
Winds average 4 mph in January.
Across January, daily wind ranges from about 4 mph on the calmest days to 4 mph at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 4 | calm |
| 2 | 4 | calm |
| 3 | 4 | calm |
| 4 | 4 | calm |
| 5 | 4 | calm |
| 6 | 4 | calm |
| 7 | 4 | calm |
| 8 | 4 | calm |
| 9 | 4 | calm |
| 10 | 4 | calm |
| 11 | 4 | calm |
| 12 | 4 | calm |
| 13 | 4 | calm |
| 14 | 4 | calm |
| 15 | 4 | calm |
| 16 | 4 | calm |
| 17 | 4 | calm |
| 18 | 4 | calm |
| 19 | 4 | calm |
| 20 | 4 | calm |
| 21 | 4 | calm |
| 22 | 4 | calm |
| 23 | 4 | calm |
| 24 | 4 | calm |
| 25 | 4 | calm |
| 26 | 4 | calm |
| 27 | 4 | calm |
| 28 | 4 | calm |
| 29 | 4 | calm |
| 30 | 4 | calm |
| 31 | 4 | calm |
Sunrise & sunset in January
Daylight runs from about 9 h 18 min at the start of January to 9 h 54 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 36 minutes over January. Sunrise moves from 7:37 AM to 7:28 AM, and sunset from 4:55 PM to 5:24 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 9.3 | 9.3 | 9.3 | 9.3 | 9.3 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.4 | 9.5 | 9.5 | 9.5 | 9.5 | 9.6 | 9.6 | 9.6 | 9.6 | 9.7 | 9.7 | 9.7 | 9.7 | 9.8 | 9.8 | 9.8 | 9.8 | 9.9 | 9.9 | 9.9 |
| Sunrise (AM) | 7:37 | 7:37 | 7:38 | 7:38 | 7:38 | 7:38 | 7:38 | 7:38 | 7:38 | 7:37 | 7:37 | 7:37 | 7:37 | 7:37 | 7:36 | 7:36 | 7:36 | 7:35 | 7:35 | 7:35 | 7:34 | 7:34 | 7:33 | 7:33 | 7:32 | 7:31 | 7:31 | 7:30 | 7:29 | 7:29 | 7:28 |
| Sunset (PM) | 4:55 | 4:55 | 4:56 | 4:57 | 4:58 | 4:59 | 5:00 | 5:00 | 5:01 | 5:02 | 5:03 | 5:04 | 5:05 | 5:06 | 5:07 | 5:08 | 5:09 | 5:10 | 5:11 | 5:12 | 5:13 | 5:14 | 5:15 | 5:17 | 5:18 | 5:19 | 5:20 | 5:21 | 5:22 | 5:23 | 5:24 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 9.3 | 7:37 | 4:55 |
| 2 | 9.3 | 7:37 | 4:55 |
| 3 | 9.3 | 7:38 | 4:56 |
| 4 | 9.3 | 7:38 | 4:57 |
| 5 | 9.3 | 7:38 | 4:58 |
| 6 | 9.4 | 7:38 | 4:59 |
| 7 | 9.4 | 7:38 | 5:00 |
| 8 | 9.4 | 7:38 | 5:00 |
| 9 | 9.4 | 7:38 | 5:01 |
| 10 | 9.4 | 7:37 | 5:02 |
| 11 | 9.4 | 7:37 | 5:03 |
| 12 | 9.4 | 7:37 | 5:04 |
| 13 | 9.5 | 7:37 | 5:05 |
| 14 | 9.5 | 7:37 | 5:06 |
| 15 | 9.5 | 7:36 | 5:07 |
| 16 | 9.5 | 7:36 | 5:08 |
| 17 | 9.6 | 7:36 | 5:09 |
| 18 | 9.6 | 7:35 | 5:10 |
| 19 | 9.6 | 7:35 | 5:11 |
| 20 | 9.6 | 7:35 | 5:12 |
| 21 | 9.7 | 7:34 | 5:13 |
| 22 | 9.7 | 7:34 | 5:14 |
| 23 | 9.7 | 7:33 | 5:15 |
| 24 | 9.7 | 7:33 | 5:17 |
| 25 | 9.8 | 7:32 | 5:18 |
| 26 | 9.8 | 7:31 | 5:19 |
| 27 | 9.8 | 7:31 | 5:20 |
| 28 | 9.8 | 7:30 | 5:21 |
| 29 | 9.9 | 7:29 | 5:22 |
| 30 | 9.9 | 7:29 | 5:23 |
| 31 | 9.9 | 7:28 | 5:24 |
Solar energy in January
Average shortwave solar energy reaching the ground each day in January, about 2.1 kWh/m².
For context, solar energy here swings from a low near 1.92 kWh/m² to a high of 8.22 kWh/m² in July across the year — January's 2.1 kWh/m² sits near the bottom.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.1 | 2.1 | 2.1 | 2.1 | 2.1 | 2.2 | 2.2 | 2.2 | 2.3 | 2.3 | 2.3 | 2.4 | 2.4 | 2.5 | 2.5 | 2.5 | 2.6 |
| Level | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 2.0 | Dim |
| 2 | 2.0 | Dim |
| 3 | 2.0 | Dim |
| 4 | 2.0 | Dim |
| 5 | 2.0 | Dim |
| 6 | 2.0 | Dim |
| 7 | 2.0 | Dim |
| 8 | 2.0 | Dim |
| 9 | 2.0 | Dim |
| 10 | 2.0 | Dim |
| 11 | 2.0 | Dim |
| 12 | 2.0 | Moderate |
| 13 | 2.0 | Moderate |
| 14 | 2.0 | Moderate |
| 15 | 2.1 | Moderate |
| 16 | 2.1 | Moderate |
| 17 | 2.1 | Moderate |
| 18 | 2.1 | Moderate |
| 19 | 2.1 | Moderate |
| 20 | 2.2 | Moderate |
| 21 | 2.2 | Moderate |
| 22 | 2.2 | Moderate |
| 23 | 2.3 | Moderate |
| 24 | 2.3 | Moderate |
| 25 | 2.3 | Moderate |
| 26 | 2.4 | Moderate |
| 27 | 2.4 | Moderate |
| 28 | 2.5 | Moderate |
| 29 | 2.5 | Moderate |
| 30 | 2.5 | Moderate |
| 31 | 2.6 | Moderate |
Hazard calendar for Ukiah
In January, Ukiah sits inside its rainy season season. The full year is below, with each hazard's peak months called out.
Ukiah's rainy season runs November–March, when most of the year's rain falls.
Is January a good time to visit Ukiah?
Our two travel scores rate January for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
January is a weaker month for outdoor sightseeing in Ukiah.
What to pack for Ukiah in January
From January's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In January, Ukiah sees daytime highs around 54°F and nights near 37°F. Worth packing: a warm layer and rain gear. About 12 days see rain.
Sea temperature near Ukiah in January
The nearest coast averages about 53°F in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 29 mi away) is warmest in September at about 55°F and coldest in April near 52°F.
The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 53 | 53 | 53 | 52 | 52 | 52 | 53 | 54 | 55 | 55 | 55 | 54 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 53 | Bracing |
| Feb | 53 | Bracing |
| Mar | 53 | Bracing |
| Apr | 52 | Bracing |
| May | 52 | Bracing |
| Jun | 52 | Bracing |
| Jul | 53 | Bracing |
| Aug | 54 | Bracing |
| Sep | 55 | Bracing |
| Oct | 55 | Bracing |
| Nov | 55 | Bracing |
| Dec | 54 | Bracing |
UV index in Ukiah in January
Clear-sky midday UV in January peaks around 2. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Ukiah peaks around July 10 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 6 | 9 | 10 | 10 | 9 | 6 | 5 | 2 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Very high | Extreme | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 9 | Very high |
| Jun | 10 | Very high |
| Jul | 10 | Extreme |
| Aug | 9 | Very high |
| Sep | 6 | High |
| Oct | 5 | Moderate |
| Nov | 2 | Moderate |
| Dec | 2 | Low |
Air quality in Ukiah in January
Average fine-particle pollution (PM2.5) through the year — so you can see where January falls, not just the annual average.
Air quality in Ukiah is worst in September — around 31 µg/m³ PM2.5 (moderate), about 5.8× the cleanest month (June, 5 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 6 | 8 | 9 | 8 | 6 | 5 | 14 | 29 | 31 | 14 | 8 | 6 |
| Level | Good | Good | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 6 | Good |
| Feb | 8 | Good |
| Mar | 9 | Good |
| Apr | 8 | Good |
| May | 6 | Good |
| Jun | 5 | Good |
| Jul | 14 | Moderate |
| Aug | 29 | Moderate |
| Sep | 31 | Moderate |
| Oct | 14 | Moderate |
| Nov | 8 | Good |
| Dec | 6 | Good |
Where is Ukiah?
Ukiah sits at 39.2°N, 123.2°W, 633 ft above sea level, in United States. The nearest listed city is Clearlake, 34 mi away.
Topography around Ukiah
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Ukiah.
Within 2 miles, the terrain around Ukiah has significant variations in elevation — a maximum elevation change of 1,765 ft around an average of 827 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,415 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,362 ft.
The land around Ukiah is covered by trees (51%), artificial surfaces (25%) and grassland (20%) within 2 miles, trees (72%) and grassland (24%) within 10 miles, and trees (59%) and water (21%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Ukiah (39.1502°, -123.2078°, elevation 633 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).