Ukiah Threshold Days by Year (USC00358726)

17 fixed thresholds counted per year at Ukiah (USC00358726): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ukiah Thresholds

Ukiah: days with 10 mm (0.39 in) or more of precipitation in 64 years, most in 1941 with 22.
Ukiah: days with a maximum temperature at or above 30 C (86 F) in 59 years, most in 1967 with 57.
Ukiah: days with a maximum temperature at or above 90 F (32.2 C) in 59 years, most in 1967 with 34.
Ukiah: days with a maximum temperature at or below 0 C (32 F) in 59 years, most in 1985 with 77.
17 fixed thresholds have at least one qualifying day at Ukiah.

Days at or above 30 C (86 F)

59 years with a qualifying day

Days per year at Ukiah with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 57 in 1967.

Days at or above 30 C (86 F) per year at Ukiah
Year	Days	Decade average
1923	22	30.2
1924	24	30.2
1926	31	30.2
1927	30	30.2
1928	34	30.2
1929	40	30.2
1930	35	38
1931	44	38
1932	36	38
1933	29	38
1934	49	38
1935	33	38
1936	32	38
1937	31	38
1938	45	38
1939	46	38
1940	40	34.7
1941	22	34.7
1942	38	34.7
1943	32	34.7
1944	34	34.7
1945	42	34.7
1950	41	31
1951	42	31
1952	39	31
1953	27	31
1956	23	31
1957	14	31
1960	31	38.5
1961	45	38.5
1962	36	38.5
1963	40	38.5
1964	30	38.5
1965	36	38.5
1966	41	38.5
1967	57	38.5
1968	40	38.5
1969	29	38.5
1970	44	33.4
1971	44	33.4
1972	25	33.4
1973	41	33.4
1974	36	33.4
1975	20	33.4
1976	19	33.4
1977	35	33.4
1978	27	33.4
1979	43	33.4
1980	22	33.4
1981	38	33.4
1982	29	33.4
1983	17	33.4
1984	37	33.4
1985	38	33.4
1986	42	33.4
1987	45	33.4
1988	45	33.4
1989	21	33.4
1990	39	39

For each year, a bar from the first to the last day at Ukiah meeting 30 C (86 F).

First to last qualifying date each year at Ukiah
Year	First date	Last date
1923	1923-07-01	1923-09-15
1924	1924-05-20	1924-08-27
1926	1926-06-06	1926-08-25
1927	1927-06-21	1927-08-22
1928	1928-06-05	1928-09-23
1929	1929-06-24	1929-09-17
1930	1930-06-06	1930-09-04
1931	1931-05-12	1931-09-05
1932	1932-06-21	1932-10-05
1933	1933-06-14	1933-10-07
1934	1934-05-14	1934-10-11
1935	1935-06-27	1935-09-21
1936	1936-05-25	1936-09-21
1937	1937-06-02	1937-09-18
1938	1938-05-26	1938-09-23
1939	1939-05-14	1939-09-21
1940	1940-05-23	1940-09-11
1941	1941-05-11	1941-08-22
1942	1942-06-29	1942-10-10
1943	1943-07-07	1943-10-04
1944	1944-06-24	1944-09-12
1945	1945-06-18	1945-09-13
1950	1950-06-28	1950-09-22
1951	1951-06-30	1951-09-19
1952	1952-07-03	1952-10-02
1953	1953-07-06	1953-09-15
1956	1956-06-27	1956-09-14
1957	1957-06-05	1957-09-25
1960	1960-07-06	1960-09-14
1961	1961-06-14	1961-08-29
1962	1962-06-24	1962-09-27
1963	1963-06-15	1963-10-02
1964	1964-06-23	1964-10-08
1965	1965-06-05	1965-08-19
1966	1966-05-03	1966-09-23
1967	1967-06-19	1967-09-29
1968	1968-05-18	1968-09-11
1969	1969-05-24	1969-09-09
1970	1970-06-03	1970-10-04
1971	1971-06-23	1971-10-10
1972	1972-06-07	1972-09-05
1973	1973-05-16	1973-09-11
1974	1974-06-12	1974-10-19
1975	1975-06-02	1975-10-03
1976	1976-05-14	1976-09-30
1977	1977-04-25	1977-09-14
1978	1978-06-06	1978-09-27
1979	1979-05-23	1979-10-08
1980	1980-07-09	1980-10-08
1981	1981-07-04	1981-09-19
1982	1982-06-20	1982-09-04
1983	1983-05-29	1983-09-01
1984	1984-05-30	1984-09-19
1985	1985-05-24	1985-08-30
1986	1986-05-26	1986-09-05
1987	1987-04-28	1987-10-03
1988	1988-05-13	1988-10-11
1989	1989-07-07	1989-09-30
1990	1990-06-22	1990-09-25

Every Fixed Threshold

Fixed thresholds at Ukiah
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	59	57	1967	39
35 C (95 F): Days	55	16	1967	4
40 C (104 F): Days	7	3	1928	1
90 F (32.2 C): Days	59	34	1967	20
100 F (37.8 C): Days	23	4	1928	1
110 F (43.3 C): Days	1	1	1961	1
0 C (32 F): Ice days (max	59	77	1985	17
0 C (32 F): Frost days (min	54	276	1935	220
-10 C (14 F): Days with min	54	69	1929	40
-20 C (-4 F): Days with min	50	26	1930	9
-30 C (-22 F): Days with min	30	10	1979	4
-40 C (-40 F): Days with min	6	2	1930	1
10 mm (0.39 in): Days with 10 mm or more rain	64	22	1941	6
25 mm (0.98 in): Days with 25 mm or more rain	26	2	1953	1
50 mm (1.97 in): Days with 50 mm or more rain	3	1	1938	1
10 cm (3.9 in): Days with 10 cm or more snowfall	55	5	1931	2
25 cm (9.8 in): Days with 25 cm or more snowfall	6	1	1930	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1923.

Download the Data

Data for Ukiah threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Ukiah Threshold Days by Year (USC00358726)

Key Facts for Ukiah Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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