Ukiah, CA Climate: Temperature & Rain by Month
Temperature and precipitation from NOAA NCEI 1991–2020 normals →, plus PlainClimate's derived comfort score
30-year climate normals (1991-2020) from Ukiah's primary NOAA station, UKIAH.
The climate verdict for Ukiah
A compact 27.5°F seasonal swing gives Ukiah, California a steadier-than-extreme annual shape. NOAA reports an annual average of 59°F. It scores 87/100 for climate comfort (excellent), putting it in the top third of station-mapped location scores and exceeding 87% of them.
- 59°F
- annual average temperature (NOAA normal)
- 87/100
- comfort score, above 87% of station-mapped location scores
- 38.9"
- yearly precipitation total
- 246 days
- frost-free growing season
Ukiah: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00049122 · Ukiah, CA 59°F mean · 38.9" precip
TEMP-MILD · RANK-UPPER · PHOTO-FINISH · PRCP-MID · SWING-NARROW · COMF-TOP · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-MILD 59°F
- RANK-UPPER #4,940
- PHOTO-FINISH ≈ Potter Valley P…
- PRCP-MID 38.9"
- SWING-NARROW 28°F
- COMF-TOP 87/100
- LOAD-HEAT 3,030 HDD
- STN-1 USC00049122
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Potter Valley Powerhouse, CA (+ 0.2 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every CA station list.
- Hot Pinnacles Natio…, CA 60°F
- Ukiah (this station) 59°F
- Near Potter Valley P…, CA 59°F
- Near Mt Locke, TX 59°F
- Cold Campo, CA 58°F
Climate Living Index · Ukiah
Ukiah: 85/100 · grade A
Ukiah publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Ukiah, not an official NOAA rating. Rankings still use Comfort Score 87/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 43 calendar days | 93/100 · A |
| Snowfall burden | 0.0 inches/year | 90/100 · A |
| Frost-free season | 246 days/year | 87/100 · A |
| Precipitation balance | 38.9 in · 3.9 from 35 in | 86/100 · A |
| Annual temperature balance | 58.9°F · 8.6° from 67.5°F | 73/100 · B |
Ukiah · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Ukiah is a temperate Köppen climate: Csa
Coldest-month mean 45.9°F and warmest-month mean 73.4°F place this station in temperate, dry-summer, hot summer climates (Csa). Class Csa is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: temperate, specifically temperate, dry-summer, hot summer.
- Köppen code
- Csa
- Group
- Temperate
- Warmest month
- 73.4°F
- Coldest month
- 45.9°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where Ukiah sits across the climate record
Three NOAA fields for Ukiah's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Top 28% warmest
- Among 6,861 stations, Ukiah sits in the warmer third of annual means.
- Annual precipitation
- 56th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Narrower than 93%
- Warmest-to-coldest month gap for Ukiah is compact versus 6,861 complete station-years.
How Ukiah compares across U.S. station-mapped locations
Ukiah's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
87 Top 13% score exceeds 87% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). Below this entry.
- 70–80: 650 station-mapped locations (11%). Below this entry.
- 80–90: 921 station-mapped locations (15%). This entry sits in this band.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 57°F (14°C) | 37°F (3°C) | 47°F (8°C) | 7.4" | 0.0" | 10.0 | 0.0 |
| February | 60°F (16°C) | 38°F (3°C) | 49°F (10°C) | 7.0" | 0.0" | 5.6 | 0.0 |
| March | 65°F (18°C) | 40°F (4°C) | 52°F (11°C) | 5.3" | 0.0" | 3.2 | 0.0 |
| April | 70°F (21°C) | 42°F (6°C) | 56°F (13°C) | 2.8" | 0.0" | 0.7 | 0.4 |
| May | 76°F (25°C) | 47°F (8°C) | 62°F (17°C) | 1.7" | 0.0" | 0.0 | 3.1 |
| June | 83°F (28°C) | 52°F (11°C) | 67°F (20°C) | 0.4" | 0.0" | 0.0 | 6.3 |
| July | 91°F (33°C) | 56°F (13°C) | 73°F (23°C) | 0.0" | 0.0" | 0.0 | 18.0 |
| August | 91°F (33°C) | 54°F (12°C) | 72°F (22°C) | 0.1" | 0.0" | 0.0 | 17.5 |
| September | 87°F (31°C) | 51°F (11°C) | 69°F (21°C) | 0.2" | 0.0" | 0.0 | 13.1 |
| October | 77°F (25°C) | 46°F (8°C) | 61°F (16°C) | 1.9" | 0.0" | 0.0 | 2.6 |
| November | 63°F (17°C) | 40°F (4°C) | 51°F (11°C) | 4.1" | 0.0" | 3.7 | 0.0 |
| December | 56°F (13°C) | 36°F (2°C) | 46°F (8°C) | 8.0" | 0.0" | 10.4 | 0.0 |
The year, day by day
The year in Ukiah runs from a mild 36°F around December 17 to 93°F at the peak near July 23, and the normal low never reaches freezing on any date in the record.
When the heat sits
Normal highs reach 90°F from July 9 through August 20, covering 43 dates. The broader mild season, normal highs of 70°F or more, runs April 18 to October 29.
This counts calendar dates whose 1991–2020 normal high reaches 90°F. It is a smaller number than the 90°F+ day counts in the monthly table above, which measure how often the threshold was actually crossed in a typical year. A date can average 88°F and still exceed 90°F in half of all years.
No freezing date
Not one calendar date in the 1991–2020 record carries a normal low at or below 32°F. The coldest normal low of the year is 36°F around December 17.
Where the wet dates fall
The likeliest wet date is December 27, when 44% of years recorded at least a hundredth of an inch. The driest is July 25 at 1%. Summed across the calendar, that is about 78 wet dates a year.
The widest day
July 30 carries the biggest normal gap between afternoon and dawn, 37°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Ukiah.
Where Ukiah Stands Nationally
Day-to-night contrast is extreme by national standards — the widest normal daily swing reaches about 37°F, sharper than nine in ten ranked stations see.
Ukiah earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall and snowfall
12.5 days with precipitation
11.9 days with precipitation
10.2 days with precipitation
7.8 days with precipitation
5.0 days with precipitation
1.6 days with precipitation
0.1 days with precipitation
0.2 days with precipitation
0.7 days with precipitation
3.6 days with precipitation
9.8 days with precipitation
13.7 days with precipitation
Ukiah's wet season runs through the cold months
December, January and February carry 57% of the year's precipitation here, while June through August contribute 1%. That is the cool-season-dominant pattern of the West Coast and the higher inland West, where storm tracks swing south in winter and summer turns dry; the thermometer meanwhile shows an unusually narrow 27.5°F seasonal spread.
- Wettest month
- December, 8.0"
- Driest month
- July, 0.0"
- Wettest three months
- December, January, February (57% of the year)
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A cool-season label means the December-February share reaches 35%. Where snow falls, the monthly figures above report liquid-equivalent precipitation, so a wet winter month is not necessarily a rainy one.
When it rains in Ukiah, it arrives in quantity
38.9" of precipitation falls across only about 77 wet days here, averaging 0.50 inches each. Fewer days carry more water: the year's total is delivered in comparatively heavy events rather than persistent damp.
- Days with measurable precipitation
- about 77 a year, 21% of all days
- Average depth per wet day
- 0.50 inches
- Most wet days
- December, about 14
- Fewest wet days
- July, about 0
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year, and a per-day average is not a forecast of any individual storm.
Ukiah's record shows no measurable snowfall
This station measured snowfall across the 1991-2020 period and recorded none: the annual normal is 0.0 inches. That is a measured zero rather than missing data, which is a meaningful distinction here , most stations in the database simply do not report snow at all, and those pages say nothing about it.
A thirty-year normal of zero describes the typical year at this station. It is not a claim that snow has never fallen in the area.
Frost Dates & Growing Season
First Fall Freeze
November 20
50% probability date
Last Spring Freeze
March 19
50% probability date
Growing Season
246 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
3,030
Higher = more heating needed
Cooling Degree Days
834
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside CA closest to Ukiah on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (59°F here).
- Alicia, AR 59°F · 0.0°F off
- Bridgeport, AL 59°F · 0.0°F off
- Decaturville, TN 59°F · 0.0°F off
- Jonesboro, AR 59°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (38.9" here), excluding temperature-peer places.
- Baraboo, WI 38.9" · 0.0" off
- Hart, MI 38.9" · 0.0" off
- Decatur, TX 38.9" · 0.0" off
- Osawatomie, KS 38.9" · 0.0" off
Data-derived climate profile
How Ukiah's climate pattern fits together
heating led · moderate · low swing
Heating is the larger measured load in Ukiah, at 3,030 degree days versus 834 for cooling. Unlike a strongly continental record, however, its 27.5°F month-to-month range is compact; persistent cool-season demand matters more than a dramatic summer-to-winter reversal.
The frost-free window extends for about 246 days. That is a long calendar measure, but it is not a forecast and does not combine heat, rainfall, soil, or local elevation into a planting recommendation.
Temperature varies within a narrow 27.5°F band across the normal year. July and December mark the typical warm and cold ends of the calendar. The annual average is 59°F. Monthly rows still matter, but they refine a steady profile rather than reveal two climatic extremes.
Ukiah's 38.9 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Recorded annual snowfall is negligible. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
These labels group NOAA 1991-2020 normals from Ukiah's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for Ukiah, not an official NOAA class or a year-ahead forecast.
Questions about Ukiah's climate
How much rain does Ukiah get? ▼
How many days above 90°F does Ukiah get? ▼
How much energy does heating and cooling require in Ukiah? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Ukiah's primary station: UKIAH (USC00049122). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as an incorporated place (GEOID 0681134). Match rule for Ukiah: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Ukiah comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.