Stanford Threshold Days by Year (USC00247858)

16 fixed thresholds counted per year at Stanford (USC00247858): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Stanford Thresholds

Stanford: days with a maximum temperature at or above 30 C (86 F) in 36 years, most in 1936 with 53.
Stanford: days with a maximum temperature at or above 90 F (32.2 C) in 36 years, most in 1936 with 36.
Stanford: days with a maximum temperature at or below 0 C (32 F) in 36 years, most in 1937 with 66.
Stanford: nights with a minimum temperature at or below 0 C (32 F) in 36 years, most in 1929 with 209.
16 fixed thresholds have at least one qualifying day at Stanford.

Days at or above 30 C (86 F)

36 years with a qualifying day

Days per year at Stanford with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 53 in 1936.

Days at or above 30 C (86 F) per year at Stanford
Year	Days	Decade average
1928	17	27.5
1929	38	27.5
1930	29	31
1931	34	31
1932	21	31
1933	32	31
1934	30	31
1935	29	31
1936	53	31
1937	28	31
1938	14	31
1939	40	31
1940	38	21.8
1941	20	21.8
1942	19	21.8
1943	21	21.8
1944	12	21.8
1945	26	21.8
1946	18	21.8
1947	22	21.8
1948	20	21.8
1949	22	21.8
1950	8	23.1
1951	16	23.1
1952	21	23.1
1953	24	23.1
1954	22	23.1
1955	31	23.1
1956	30	23.1
1957	26	23.1
1958	26	23.1
1959	27	23.1
1960	34	31.5
1961	43	31.5
1962	11	31.5
1963	38	31.5

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

First to last qualifying date each year at Stanford
Year	First date	Last date
1928	1928-05-22	1928-09-05
1929	1929-06-28	1929-08-31
1930	1930-06-07	1930-08-24
1931	1931-05-14	1931-09-06
1932	1932-06-22	1932-09-06
1933	1933-06-14	1933-08-18
1934	1934-05-25	1934-10-11
1935	1935-06-22	1935-09-15
1936	1936-05-14	1936-09-21
1937	1937-06-16	1937-09-18
1938	1938-07-14	1938-09-24
1939	1939-04-29	1939-09-21
1940	1940-06-12	1940-09-11
1941	1941-06-22	1941-08-10
1942	1942-07-02	1942-09-08
1943	1943-07-06	1943-09-26
1944	1944-05-15	1944-09-13
1945	1945-06-21	1945-09-04
1946	1946-07-21	1946-09-14
1947	1947-05-02	1947-09-12
1948	1948-06-30	1948-09-22
1949	1949-06-08	1949-08-22
1950	1950-05-27	1950-09-04
1951	1951-07-13	1951-08-05
1952	1952-06-05	1952-09-03
1953	1953-06-12	1953-09-15
1954	1954-05-19	1954-09-02
1955	1955-07-14	1955-09-14
1956	1956-06-04	1956-09-19
1957	1957-07-05	1957-10-01
1958	1958-05-10	1958-09-11
1959	1959-06-14	1959-09-13
1960	1960-05-12	1960-09-04
1961	1961-06-06	1961-08-29
1962	1962-07-17	1962-08-26
1963	1963-06-19	1963-10-02

Every Fixed Threshold

Fixed thresholds at Stanford
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	36	53	1936	38
35 C (95 F): Days	31	16	1936	6
40 C (104 F): Days	1	1	1961	1
90 F (32.2 C): Days	36	36	1936	15
100 F (37.8 C): Days	12	3	1936	1
0 C (32 F): Ice days (max	36	66	1937	31
0 C (32 F): Frost days (min	36	209	1929	151
-10 C (14 F): Days with min	36	93	1929	50
-20 C (-4 F): Days with min	36	45	1936	23
-30 C (-22 F): Days with min	31	15	1950	8
-40 C (-40 F): Days with min	3	3	1936	1
20 C (68 F): Tropical nights (min	6	3	1936	2
10 mm (0.39 in): Days with 10 mm or more rain	36	15	1938	8
25 mm (0.98 in): Days with 25 mm or more rain	25	4	1957	2
50 mm (1.97 in): Days with 50 mm or more rain	4	1	1933	1
10 cm (3.9 in): Days with 10 cm or more snowfall	12	8	1949	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1928.

Download the Data

Data for Stanford 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).

Stanford Threshold Days by Year (USC00247858)

Key Facts for Stanford Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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