Ukiah, California climate: Normal weather by month, frost dates and records
Ukiah's normal year runs from 36°F December nights to 94°F July afternoons, with 34.8 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 15.4°C, December lows of 2°C, July highs of 34°C, 885 mm of precipitation a year.
- NOAA stationUkiah Municipal Airport
- Station IDUSW00023275
- Location39.13°N 123.20°W
- Elevation601 ft (183 m)
- Population16,067
On October 23, the normal high in Ukiah is 76°F and the normal low 44°F, and the chance of measurable rain or snow is 22%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Ukiah.
- Jan 58° 37°
- Feb 61° 39°
- Mar 65° 41°
- Apr 69° 43°
- May 78° 48°
- Jun 86° 52°
- Jul 94° 56°
- Aug 94° 55°
- Sep 89° 51°
- Oct 79° 45°
- Nov 65° 40°
- Dec 57° 36°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Ukiah each month?
July is the warmest month, with normal highs of 94°F; December the coldest, with normal lows of 36°F. The most precipitation falls in December (6.92 in), the least in July (0.01 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 58°F | 37°F | 47.7°F | 6.70 | 14 | <1 | 10 | 9 h 40 min |
| February | 61°F | 39°F | 49.9°F | 6.27 | 12 | <1 | 7 | 10 h 40 min |
| March | 65°F | 41°F | 52.7°F | 5.32 | 13 | <1 | 2 | 11 h 50 min |
| April | 69°F | 43°F | 55.9°F | 2.55 | 8 | 1 | 1 | 13 h 10 min |
| May | 78°F | 48°F | 62.7°F | 1.18 | 4 | 5 | <1 | 14 h 20 min |
| June | 86°F | 52°F | 68.9°F | 0.34 | 2 | 12 | <1 | 14 h 50 min |
| July | 94°F | 56°F | 75.0°F | 0.01 | <1 | 23 | <1 | 14 h 40 min |
| August | 94°F | 55°F | 74.1°F | 0.07 | <1 | 23 | <1 | 13 h 40 min |
| September | 89°F | 51°F | 69.8°F | 0.16 | 1 | 15 | <1 | 12 h 30 min |
| October | 79°F | 45°F | 62.0°F | 1.78 | 5 | 4 | <1 | 11 h 10 min |
| November | 65°F | 40°F | 52.3°F | 3.54 | 11 | <1 | 5 | 10 h |
| December | 57°F | 36°F | 46.3°F | 6.92 | 15 | <1 | 11 | 9 h 30 min |
| Year (annual) | 74°F | 45°F | 59.8°F | 34.84 | 86 | 83 | 36 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 15°C | 3°C | 8.7°C | 170 mm |
| February | 16°C | 4°C | 9.9°C | 159 mm |
| March | 18°C | 5°C | 11.5°C | 135 mm |
| April | 21°C | 6°C | 13.3°C | 65 mm |
| May | 25°C | 9°C | 17.1°C | 30 mm |
| June | 30°C | 11°C | 20.5°C | 9 mm |
| July | 34°C | 13°C | 23.9°C | 0 mm |
| August | 34°C | 13°C | 23.4°C | 2 mm |
| September | 32°C | 10°C | 21.0°C | 4 mm |
| October | 26°C | 7°C | 16.7°C | 45 mm |
| November | 18°C | 4°C | 11.3°C | 90 mm |
| December | 14°C | 2°C | 7.9°C | 176 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. Ukiah's own co-op station Ukiah station does: 0 inches of snow in a normal year (see the other stations below).
Source: NOAA NCEI 1991-2020 monthly normals, station USW00023275; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Ukiah?
Normal highs sit between 65°F and 85°F in April, May and October. Of those, May has the fewest days with rain (4).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00023275.
When is the last frost in Ukiah?
In Ukiah, the last spring frost (32°F) comes after March 5 in half of years and after April 7 in one year in ten; the first autumn frost comes before November 21 in half of years and before November 2 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- March 51 year in 10 after April 7; 9 in 10 after January 29
- First autumn frost, half of years before
- November 211 year in 10 before November 2; 9 in 10 before December 9
NOAA puts the median frost-free season at 259 days, and the season without a hard freeze (28°F) at 318 days.
A hard freeze (28°F) comes after January 27 in half of springs and before December 5 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Ukiah in zone 9a in ZIP code 95482, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Ukiah's NOAA station is in zone 9a: the coldest night of a typical year reaches 23°F (20 complete years).
Frost dates for every NOAA station in California · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00023275; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Ukiah?
In a normal year in Ukiah, 83 days a year reach 90°F (20 of them 100°F or more), 36 nights fall to 32°F or colder and 86 days bring measurable precipitation.
- Days at 90°F or more
- 83a normal year
- Days at 100°F or more
- 20a normal year
- Nights at 32°F or colder
- 36a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 86a normal year
The highest temperature in Ukiah's official record (kept by the National Weather Service since 1893) is 117°F, on July 6, 2024; the lowest is 12°F, on January 12, 1898.
The wettest calendar year on that record is 1998, with 67.03 in; the snowiest season is 1951–52, with 5.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USW00023275; records: ACIS (NOAA Regional Climate Centers), NWS threaded record UKIthr. Records use complete months only; a month missing more than three days is left out.
How humid and windy is Ukiah, and how clear are its skies?
The summer (June-August) dew point averages 50°F. The muggiest month is July, with an average dew point of 51°F; the driest air comes in December (38°F). May is the windiest month (5.1 mph on average), and August has the most clear or nearly clear hours (94%).
| Month | Dew point | Humidity | Afternoon humidity | Wind | Clear or few clouds | Overcast |
|---|---|---|---|---|---|---|
| January | 40°F | 77% | 50% | 2.7 mph | 58% | 28% |
| February | 40°F | 73% | 47% | 3.6 mph | – | – |
| March | 41°F | 66% | 43% | 4.2 mph | 63% | 21% |
| April | 43°F | 59% | 35% | 4.4 mph | 71% | 18% |
| May | 47°F | 56% | 33% | 5.1 mph | 80% | 11% |
| June | 50°F | 49% | 26% | 4.7 mph | 91% | 5% |
| July | 51°F | 49% | 23% | 4.4 mph | 94% | 4% |
| August | 48°F | 49% | 22% | 3.6 mph | 94% | 2% |
| September | 44°F | 52% | 24% | 3.7 mph | 87% | 6% |
| October | 43°F | 66% | 36% | 2.1 mph | 74% | 16% |
| November | 39°F | 77% | 52% | 2.2 mph | – | – |
| December | 38°F | 80% | 58% | 2.5 mph | – | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00023275. Monthly averages of all hours; afternoon humidity at 3 p.m. local standard time; sky as the share of hours NOAA's observations rate clear or few clouds (a dash where NOAA publishes no sky value).
How sunny is Ukiah?
Over a year 84% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Ukiah, 4.9 kWh per square metre a day. July is the sunniest month (93%) and December the cloudiest (68%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 71% | 2.2 |
| February | 73% | 3.1 |
| March | 74% | 4.3 |
| April | 79% | 5.8 |
| May | 84% | 7.0 |
| June | 91% | 8.0 |
| July | 93% | 7.9 |
| August | 91% | 6.9 |
| September | 90% | 5.6 |
| October | 85% | 4.0 |
| November | 77% | 2.5 |
| December | 68% | 1.8 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Ukiah need?
A normal year in Ukiah brings 2,879 heating degree days, 46% fewer than the median U.S. place (5,373), and 1,005 cooling degree days, 11% more than the median (908). Five months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,991 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 535 | 0 |
| February | 423 | 0 |
| March | 380 | 1 |
| April | 278 | 7 |
| May | 120 | 50 |
| June | 29 | 148 |
| July | 1 | 312 |
| August | 1 | 284 |
| September | 20 | 164 |
| October | 130 | 39 |
| November | 383 | 1 |
| December | 580 | 0 |
| Year (annual) | 2,879 | 1,005 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00023275. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Ukiah been warmer than normal lately?
2025 averaged 61.4°F, 1.6°F above the 1991-2020 normal of 59.8°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 61.5°F | +1.7°F | 24.11 |
| 2022 | 60.6°F | +0.8°F | 18.95 |
| 2023 | 59.9°F | +0.1°F | 38.12 |
| 2024 | 62.5°F | +2.7°F | 47.30 |
| 2025 | 61.4°F | +1.6°F | 32.70 |
Source: observed years: ACIS, station USW00023275. A year counts only with all twelve months complete.
How does Ukiah's climate compare?
Ukiah is warmer than 90 of the other 218 places with their own NOAA record in California, and wetter than 177. Across the 7,247 U.S. stations with normals, its annual mean of 59.8°F is warmer than 74%.
In the Köppen classification computed from these normals, Ukiah is Csa: temperate, dry-summer, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Ukiah share this climate record?
11 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Lakeport, CA5,104 people · 16 mi E
- North Lakeport, CA3,221 people · 16 mi E
- Nice, CA2,517 people · 19 mi E
- Upper Lake, CA1,204 people · 16 mi E
- Boonville, CA985 people · 12 mi SW
- Hopland, CA966 people · 12 mi SE
- Talmage, CA886 people · 2 mi E
- Calpella, CA555 people · 7 mi N
- Point Arena, CA449 people · 30 mi SW
- Manchester, CA234 people · 28 mi W
- Philo, CA41 people · 14 mi W
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
What do Ukiah's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Ukiah. This page uses Ukiah Municipal Airport; the other differs by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Ukiah station USC00049122 | 2 mi N | 636 ft | 58.9°F | 37°F | 91°F | 38.9 | 0 | March 19 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Ukiah's climate
What is the coldest month in Ukiah?
December, with a normal high of 57°F and a normal low of 36°F. The warmest is July (94°F by day, 56°F at night).
Does it snow in Ukiah?
Rarely. NOAA publishes no 1991-2020 snowfall normal for Ukiah's NOAA station; Ukiah's own co-op station Ukiah station records 0 inches of snow in a normal year.
What is the rainiest month in Ukiah?
December, with 6.92 in of precipitation in a normal year; the driest is July with 0.01 in.
What plant hardiness zone is Ukiah in?
The USDA's 2023 map puts Ukiah in zone 9a in ZIP code 95482, the nearest ZIP area. By the same method at Ukiah's NOAA station, the coldest night of a typical year reaches 23°F (20 years, 1991-2020): zone 9a.
How late can frost come in Ukiah?
In half of years the last 32°F night comes after March 5; in one year in ten it comes after April 7. Waiting until April 7 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Ukiah in OctoberThis month day by day, its records and recent years
- California climateThe statewide normals and every place in the state
- Potter Valley, CA17 miles from this station, 59.1°F a year
- Willits, CA22 miles from this station, 53.1°F a year
- Cloverdale, CA25 miles from this station, 61.8°F a year
- Clearlake, CA37 miles from this station, 56.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made