Ukiah climate — normals and trends

Q: What is the climate of Ukiah?

Ukiah has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 12.9 °C and it receives 1,032 mm of precipitation per year.

Q: What is the hottest day ever recorded in Ukiah?

The hottest day measured in Ukiah between 1940 and 2025 was 6 September 2022, reaching 42.5 °C.

Q: What is the coldest day in Ukiah?

The coldest day measured in Ukiah between 1940 and 2025 was 9 December 1972, at -12.4 °C.

Q: Does it snow in Ukiah?

Yes. Ukiah gets on average 26.4 cm of snow per year and has around 35 frost days.

Q: Has the climate of Ukiah warmed?

Yes: Ukiah warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Ukiah?

The wettest day measured in Ukiah between 1940 and 2025 was 22 December 1964, with 118 mm of rain in 24 hours.

Q: What was the windiest day in Ukiah?

The windiest day measured in Ukiah between 1940 and 2025 was 12 October 1962, with winds reaching 31.3 km/h.

Q: What is the warmest month in Ukiah?

The warmest month in Ukiah is July (21.3 °C on average); the coldest is January (6.0 °C).

Q: How much does it rain in Ukiah?

Ukiah receives on average 1,032 mm of precipitation per year, spread over about 79 rainy days.

Q: Is it sunny in Ukiah?

Ukiah gets on average 10.2 hours of sunshine per day, roughly 3,723 hours per year over 1940-2025.

Ukiah (United States) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 12.9 °C and it receives 1,032 mm of precipitation per year.

These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.

The warmest month is July (21.3 °C on average) and the coldest is January (6.0 °C). Rainfall peaks in January.

Ukiah averages 35 frost days, 52 hot days (≥ 30 °C) and 79 rainy days per year.

Ukiah has warmed by +1.4 °C between 1940 and 2025, or +0.17 °C per decade. This trend is statistically significant.

The number of frost days there went from about 46 to 24 per year over the period.

The hottest day of the period reached 42.5 °C (on 6 September 2022) and the coldest -12.4 °C (on 9 December 1972).

Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.

Climate normals · ERA5

UkiahCalifornia

coords: 39.15°, -123.21°
period: 1940–2025 · 86 yrs

CsbWarm-summer MediterraneanWarmest monthJulyColdest monthJanuaryWettest monthJanuaryDriest monthJuly

Mean daily temperature

12.9°C

Average daily high

20.0°C

Average daily low

7.2°C

Annual rainfall

1,032mm

Sunshine / day

10.2h

Mean relative humidity

69%

Average peak wind

11.5km/h

Seasonal range

15.3°C

Frost days (< 0 °C)

35 d/yr

Hot days (≥ 30 °C)

52 d/yr

Rainy days (≥ 1 mm)

79 d/yr

Annual snowfall

26.4 cm

Average feels-like high

18.6 °C

Average feels-like low

5.3 °C

Average peak gust

36.4 km/h

Tropical nights (≥ 20 °C)

1 d/yr

Solar radiation

18.2 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.4 °C

since 1940

+0.2 °C per decade · r² = 0.39 · p = < 0.001

19402025

Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).

A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.

Records for the period

Hottest day

42.5 °C

6 September 2022

Coldest day

-12.4 °C

9 December 1972

Wettest day

118 mm

22 December 1964

Windiest day

31.3 km/h

12 October 1962

Strongest gust

115.9 km/h

12 December 1995

Hottest feels-like

44.4 °C

15 July 1972

Coldest feels-like

-17.3 °C

9 December 1972

Snowiest day

19.4 cm

14 March 1952

Sunniest day

14.6 h

4 July 2025

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	35.1 °C23 September 2025	-3.9 °C10 February 2025	13.9 °C	1,061 mm	45	18
2024	41.0 °C6 July 2024	-3.9 °C6 April 2024	14.1 °C	1,499 mm	69	20
2023	37.0 °C1 July 2023	-3.8 °C1 March 2023	13.3 °C	1,210 mm	47	42
2022	42.5 °C6 September 2022	-5.3 °C24 February 2022	13.4 °C	663 mm	57	41
2021	35.9 °C10 July 2021	-3.1 °C26 January 2021	13.7 °C	784 mm	63	24
2020	40.2 °C6 September 2020	-2.8 °C26 March 2020	14.2 °C	476 mm	68	27
2019	37.8 °C25 September 2019	-3.6 °C28 November 2019	13.6 °C	1,237 mm	45	31
2018	37.1 °C30 June 2018	-3.6 °C20 February 2018	13.6 °C	765 mm	50	40
2017	40.8 °C2 September 2017	-3.5 °C6 January 2017	14.0 °C	1,210 mm	67	32
2016	37.1 °C26 July 2016	-4.2 °C18 December 2016	14.0 °C	1,225 mm	52	17
2015	36.9 °C28 July 2015	-4.3 °C29 November 2015	14.4 °C	636 mm	47	23
2014	36.3 °C14 July 2014	-2.6 °C1 January 2014	14.4 °C	1,030 mm	54	23
2013	38.3 °C2 July 2013	-6.6 °C5 December 2013	13.0 °C	297 mm	35	53
2012	35.7 °C13 August 2012	-4.6 °C17 January 2012	12.9 °C	1,238 mm	37	31
2011	37.0 °C9 September 2011	-6.9 °C26 February 2011	12.2 °C	880 mm	30	43
2010	38.2 °C25 August 2010	-3.8 °C29 November 2010	12.7 °C	1,372 mm	37	17
2009	37.0 °C26 September 2009	-5.4 °C8 December 2009	12.9 °C	747 mm	50	33
2008	39.3 °C8 July 2008	-4.2 °C26 December 2008	12.9 °C	742 mm	39	32
2007	36.0 °C5 July 2007	-4.4 °C14 January 2007	12.5 °C	655 mm	30	47
2006	39.5 °C23 July 2006	-5.4 °C19 December 2006	13.3 °C	1,187 mm	46	35
2005	35.8 °C17 July 2005	-3.8 °C6 December 2005	13.1 °C	1,395 mm	43	18
2004	35.7 °C11 August 2004	-3.5 °C3 January 2004	13.6 °C	985 mm	40	17
2003	38.4 °C29 July 2003	-3.8 °C27 December 2003	13.5 °C	1,065 mm	58	23
2002	40.4 °C10 July 2002	-3.8 °C30 January 2002	13.4 °C	975 mm	52	22
2001	38.4 °C3 July 2001	-4.1 °C23 February 2001	13.2 °C	1,042 mm	58	38
2000	41.5 °C14 June 2000	-3.5 °C24 February 2000	13.2 °C	996 mm	59	20
1999	39.1 °C12 July 1999	-4.6 °C11 February 1999	12.6 °C	976 mm	43	44
1998	40.9 °C4 August 1998	-6.2 °C22 December 1998	12.5 °C	1,621 mm	45	29
1997	39.0 °C7 August 1997	-4.0 °C14 January 1997	13.4 °C	899 mm	36	17
1996	38.9 °C12 August 1996	-4.3 °C26 February 1996	14.0 °C	1,507 mm	64	10
1995	37.2 °C16 July 1995	-2.9 °C17 January 1995	13.6 °C	1,763 mm	46	12
1994	35.5 °C14 July 1994	-3.6 °C19 November 1994	13.0 °C	750 mm	51	33
1993	40.2 °C1 August 1993	-7.0 °C3 January 1993	13.0 °C	1,058 mm	49	39
1992	38.3 °C18 August 1992	-4.1 °C19 December 1992	14.0 °C	981 mm	66	35
1991	40.8 °C3 July 1991	-4.1 °C1 January 1991	13.2 °C	825 mm	60	32
1990	40.0 °C6 August 1990	-9.7 °C19 February 1990	12.8 °C	612 mm	45	52
1989	36.4 °C22 June 1989	-4.6 °C5 February 1989	12.8 °C	762 mm	38	47
1988	41.7 °C4 September 1988	-6.3 °C26 December 1988	13.8 °C	746 mm	66	24
1987	37.7 °C2 August 1987	-3.2 °C26 February 1987	13.7 °C	1,004 mm	51	33
1986	36.6 °C4 August 1986	-3.1 °C30 November 1986	13.7 °C	1,332 mm	51	11
1985	37.3 °C11 June 1985	-4.6 °C14 November 1985	12.6 °C	575 mm	53	47
1984	38.8 °C2 July 1984	-2.9 °C20 December 1984	13.0 °C	897 mm	56	22
1983	37.0 °C6 August 1983	-2.5 °C20 January 1983	12.8 °C	2,066 mm	38	11
1982	36.7 °C22 August 1982	-5.0 °C6 January 1982	12.2 °C	1,454 mm	41	47
1981	40.4 °C7 August 1981	-2.8 °C31 January 1981	13.7 °C	1,219 mm	64	6
1980	39.8 °C27 July 1980	-2.8 °C30 January 1980	13.1 °C	907 mm	45	17
1979	37.1 °C13 September 1979	-5.8 °C3 February 1979	13.0 °C	1,102 mm	51	35
1978	41.1 °C6 August 1978	-5.3 °C14 November 1978	13.1 °C	1,008 mm	44	29
1977	38.1 °C30 July 1977	-3.7 °C19 November 1977	12.7 °C	789 mm	43	23
1976	36.4 °C26 July 1976	-6.9 °C3 March 1976	12.5 °C	435 mm	43	47
1975	38.4 °C25 July 1975	-4.6 °C30 January 1975	12.3 °C	1,116 mm	53	40
1974	37.6 °C24 July 1974	-11.7 °C8 January 1974	12.8 °C	1,093 mm	60	39
1973	38.0 °C26 July 1973	-3.7 °C4 January 1973	13.0 °C	1,483 mm	56	25
1972	42.2 °C14 July 1972	-12.4 °C9 December 1972	12.2 °C	886 mm	43	43
1971	39.7 °C13 September 1971	-4.4 °C3 January 1971	11.8 °C	765 mm	51	52
1970	40.0 °C4 July 1970	-4.1 °C22 December 1970	13.2 °C	1,273 mm	66	32
1969	37.0 °C20 July 1969	-10.0 °C29 January 1969	12.5 °C	1,124 mm	51	50
1968	36.5 °C29 August 1968	-5.4 °C6 January 1968	12.6 °C	1,014 mm	47	41
1967	38.0 °C18 August 1967	-5.4 °C20 December 1967	12.8 °C	1,037 mm	75	52
1966	38.9 °C6 August 1966	-8.2 °C1 January 1966	13.2 °C	870 mm	61	42
1965	36.6 °C5 August 1965	-10.9 °C1 January 1965	12.4 °C	783 mm	37	34
1964	37.6 °C24 July 1964	-3.6 °C15 January 1964	12.3 °C	1,046 mm	48	51
1963	36.1 °C26 July 1963	-5.2 °C14 January 1963	12.3 °C	1,053 mm	42	47
1962	35.9 °C20 June 1962	-4.9 °C21 January 1962	12.7 °C	927 mm	50	36
1961	41.0 °C15 June 1961	-5.4 °C2 January 1961	12.9 °C	819 mm	76	33
1960	38.8 °C19 July 1960	-3.9 °C5 January 1960	13.0 °C	1,125 mm	58	36
1959	38.9 °C10 July 1959	-4.9 °C12 February 1959	13.5 °C	801 mm	62	30
1958	37.2 °C6 September 1958	-3.6 °C9 March 1958	14.1 °C	1,239 mm	80	26
1957	37.4 °C8 September 1957	-6.3 °C9 January 1957	12.5 °C	1,080 mm	53	43
1956	39.1 °C22 July 1956	-6.2 °C7 December 1956	12.5 °C	900 mm	50	42
1955	42.4 °C3 September 1955	-9.5 °C28 February 1955	12.2 °C	937 mm	60	60
1954	39.1 °C28 July 1954	-5.6 °C25 January 1954	12.6 °C	1,134 mm	56	41
1953	37.7 °C13 September 1953	-4.0 °C13 March 1953	12.7 °C	1,184 mm	63	31
1952	39.5 °C28 July 1952	-6.6 °C1 January 1952	12.6 °C	1,372 mm	83	49
1951	38.3 °C9 September 1951	-6.4 °C3 March 1951	13.0 °C	1,407 mm	64	39
1950	40.9 °C2 September 1950	-9.6 °C15 January 1950	13.1 °C	1,380 mm	59	33
1949	36.8 °C13 June 1949	-8.3 °C4 January 1949	12.1 °C	704 mm	44	59
1948	37.9 °C10 September 1948	-7.1 °C7 February 1948	11.1 °C	1,205 mm	41	72
1947	36.3 °C14 September 1947	-7.6 °C29 January 1947	11.6 °C	805 mm	32	59
1946	38.0 °C2 August 1946	-5.9 °C11 February 1946	11.2 °C	611 mm	48	68
1945	38.6 °C12 September 1945	-4.6 °C24 March 1945	12.5 °C	1,164 mm	77	57
1944	38.0 °C27 August 1944	-3.5 °C29 December 1944	12.2 °C	1,036 mm	50	46
1943	38.6 °C27 July 1943	-5.0 °C18 January 1943	12.8 °C	632 mm	60	33
1942	39.2 °C24 July 1942	-7.6 °C2 January 1942	12.1 °C	1,092 mm	56	49
1941	38.2 °C21 July 1941	-7.8 °C26 December 1941	12.0 °C	1,462 mm	46	40
1940	37.2 °C10 August 1940	-4.3 °C19 February 1940	12.6 °C	1,527 mm	51	40

Normals computed over complete calendar years 1940–2025.

A specific year

Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?

Year

Across the whole year

Average daily high

20.7 °C

+0.7 °C

Hot days (≥ 30 °C)

45 d/yr

-7

Frost days (< 0 °C)

18 d/yr

-17

Annual rainfall

1061 mm

+29 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	15.3 °C	+3.8 °C	55 mm	-133 mm
Feb	13.4 °C	+0.3 °C	263 mm	+100 mm
Mar	13.7 °C	-0.8 °C	199 mm	+50 mm
Apr	19.2 °C	+1.8 °C	39 mm	-41 mm
May	23.0 °C	+1.7 °C	18 mm	-24 mm
Jun	27.3 °C	+1.5 °C	1 mm	-13 mm
Jul	28.6 °C	-1.5 °C	1 mm	-0 mm
Aug	30.4 °C	+0.8 °C	1 mm	-3 mm
Sep	26.8 °C	-0.8 °C	31 mm	+18 mm
Oct	20.2 °C	-1.8 °C	66 mm	+3 mm
Nov	16.7 °C	+1.6 °C	131 mm	+0 mm
Dec	13.2 °C	+1.7 °C	256 mm	+72 mm

The year's extremes

Hottest day

35.1 °C

23 Sep 2025

Coldest day

-3.9 °C

10 Feb 2025

Wettest day

84.4 mm

21 Dec 2025

Windiest day

27.8 km/h

25 Dec 2025

Strongest gust

95.8 km/h

25 Dec 2025

Hottest feels-like

36.5 °C

11 Jul 2025

Coldest feels-like

-7.3 °C

10 Feb 2025

Snowiest day

5.5 cm

14 Mar 2025

Sunniest day

14.6 h

4 Jul 2025

What was the weather like that day?

Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.

Date

Frequently asked questions

What is the climate of Ukiah?

Ukiah has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 12.9 °C and it receives 1,032 mm of precipitation per year.

What is the hottest day ever recorded in Ukiah?

The hottest day measured in Ukiah between 1940 and 2025 was 6 September 2022, reaching 42.5 °C.

What is the coldest day in Ukiah?

The coldest day measured in Ukiah between 1940 and 2025 was 9 December 1972, at -12.4 °C.

Does it snow in Ukiah?

Yes. Ukiah gets on average 26.4 cm of snow per year and has around 35 frost days.

Has the climate of Ukiah warmed?

Yes: Ukiah warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Ukiah?

The wettest day measured in Ukiah between 1940 and 2025 was 22 December 1964, with 118 mm of rain in 24 hours.

What was the windiest day in Ukiah?

The windiest day measured in Ukiah between 1940 and 2025 was 12 October 1962, with winds reaching 31.3 km/h.

What is the warmest month in Ukiah?

The warmest month in Ukiah is July (21.3 °C on average); the coldest is January (6.0 °C).

How much does it rain in Ukiah?

Ukiah receives on average 1,032 mm of precipitation per year, spread over about 79 rainy days.

Is it sunny in Ukiah?

Ukiah gets on average 10.2 hours of sunshine per day, roughly 3,723 hours per year over 1940-2025.

What is the biggest single-day snowfall in Ukiah?

The heaviest 24-hour snowfall measured in Ukiah between 1940 and 2025 was 14 March 1952, with 19.4 cm.

Are there tropical nights in Ukiah?

Yes: Ukiah has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Ukiah?

In Ukiah, between 1940 and 2025, the highest apparent temperature reached 44.4 °C on 15 July 1972, and the lowest was -17.3 °C on 9 December 1972.

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