Dixon Threshold Days by Year (USC00482610)

15 fixed thresholds counted per year at Dixon (USC00482610): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Dixon Thresholds

Dixon: nights with a minimum temperature at or below 0 C (32 F) in 54 years, most in 1924 with 249.
Dixon: nights with a minimum temperature at or below -10 C (14 F) in 54 years, most in 1964 with 128.
Dixon: nights with a minimum temperature at or below -20 C (-4 F) in 54 years, most in 1964 with 70.
Dixon: days with 10 mm (0.39 in) or more of precipitation in 54 years, most in 1927 with 13.
15 fixed thresholds have at least one qualifying day at Dixon.

Days at or above 30 C (86 F)

52 years with a qualifying day

Days per year at Dixon with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 50 in 1940.

Days at or above 30 C (86 F) per year at Dixon
Year	Days	Decade average
1923	11	18.9
1924	23	18.9
1925	15	18.9
1926	30	18.9
1927	14	18.9
1928	18	18.9
1929	21	18.9
1930	20	29.2
1931	35	29.2
1932	23	29.2
1933	33	29.2
1934	42	29.2
1935	22	29.2
1936	44	29.2
1937	29	29.2
1938	15	29.2
1939	29	29.2
1940	50	17.4
1941	19	17.4
1942	12	17.4
1943	19	17.4
1944	10	17.4
1945	9	17.4
1946	20	17.4
1947	15	17.4
1948	15	17.4
1949	5	17.4
1951	11	16.3
1952	2	16.3
1953	8	16.3
1954	20	16.3
1955	14	16.3
1956	15	16.3
1957	17	16.3
1958	28	16.3
1959	32	16.3
1960	40	22.8
1961	36	22.8
1962	16	22.8
1963	37	22.8
1964	35	22.8
1966	16	22.8
1967	7	22.8
1968	6	22.8
1969	12	22.8
1970	10	8.7
1971	8	8.7
1972	6	8.7
1973	10	8.7
1974	7	8.7
1975	7	8.7
1976	13	8.7

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

First to last qualifying date each year at Dixon
Year	First date	Last date
1923	1923-07-01	1923-07-30
1924	1924-06-14	1924-09-05
1925	1925-06-20	1925-07-28
1926	1926-06-06	1926-08-30
1927	1927-06-23	1927-09-10
1928	1928-07-05	1928-08-21
1929	1929-06-29	1929-08-30
1930	1930-06-11	1930-08-21
1931	1931-06-15	1931-08-24
1932	1932-06-22	1932-08-24
1933	1933-06-10	1933-09-29
1934	1934-06-12	1934-08-28
1935	1935-06-14	1935-09-01
1936	1936-05-30	1936-08-25
1937	1937-06-21	1937-09-19
1938	1938-07-09	1938-08-24
1939	1939-06-14	1939-09-02
1940	1940-06-13	1940-09-08
1941	1941-06-22	1941-08-09
1942	1942-07-04	1942-08-09
1943	1943-06-26	1943-08-14
1944	1944-05-18	1944-08-08
1945	1945-06-22	1945-08-02
1946	1946-06-15	1946-08-19
1947	1947-07-02	1947-09-03
1948	1948-06-06	1948-09-04
1949	1949-07-31	1949-08-07
1951	1951-07-05	1951-08-01
1952	1952-07-18	1952-07-23
1953	1953-06-29	1953-07-27
1954	1954-06-22	1954-08-31
1955	1955-06-23	1955-08-01
1956	1956-06-07	1956-08-16
1957	1957-06-03	1957-08-19
1958	1958-06-23	1958-09-11
1959	1959-06-06	1959-09-11
1960	1960-06-18	1960-09-05
1961	1961-06-17	1961-08-30
1962	1962-06-24	1962-09-19
1963	1963-06-12	1963-08-16
1964	1964-07-01	1964-08-13
1966	1966-07-06	1966-08-18
1967	1967-07-12	1967-08-25
1968	1968-06-21	1968-08-06
1969	1969-07-17	1969-08-27
1970	1970-06-26	1970-08-25
1971	1971-06-22	1971-07-17
1972	1972-07-29	1972-08-14
1973	1973-06-30	1973-08-21
1974	1974-06-23	1974-07-14
1975	1975-07-01	1975-08-10
1976	1976-06-29	1976-09-05

Every Fixed Threshold

Fixed thresholds at Dixon
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	52	50	1940	13
35 C (95 F): Days	10	5	1931	1
90 F (32.2 C): Days	40	20	1940	3
0 C (32 F): Ice days (max	53	65	1924	27
0 C (32 F): Frost days (min	54	249	1924	213
-10 C (14 F): Days with min	54	128	1964	100
-20 C (-4 F): Days with min	54	70	1964	19
-30 C (-22 F): Days with min	38	17	1930	1
-40 C (-40 F): Days with min	5	4	1963	4
20 C (68 F): Tropical nights (min	2	1	1927	1
10 mm (0.39 in): Days with 10 mm or more rain	54	13	1927	6
25 mm (0.98 in): Days with 25 mm or more rain	21	3	1937	1
50 mm (1.97 in): Days with 50 mm or more rain	4	1	1923	1
10 cm (3.9 in): Days with 10 cm or more snowfall	48	13	1945	2
25 cm (9.8 in): Days with 25 cm or more snowfall	13	3	1949	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 Dixon 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).

Dixon Threshold Days by Year (USC00482610)

Key Facts for Dixon Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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