Mission 4 W Threshold Days by Year (USC00415972)

15 fixed thresholds counted per year at Mission 4 W (USC00415972): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mission 4 W Thresholds

Mission 4 W: days with 10 mm (0.39 in) or more of precipitation in 74 years, most in 1976 with 25.
Mission 4 W: days with 25 mm (0.98 in) or more of precipitation in 74 years, most in 1967 with 13.
Mission 4 W: days with a maximum temperature at or above 30 C (86 F) in 69 years, most in 1927 with 251.
Mission 4 W: days with a maximum temperature at or above 35 C (95 F) in 69 years, most in 1989 with 143.
15 fixed thresholds have at least one qualifying day at Mission 4 W.

Days at or above 30 C (86 F)

69 years with a qualifying day

Days per year at Mission 4 W with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 251 in 1927.

Days at or above 30 C (86 F) per year at Mission 4 W
Year	Days	Decade average
1911	219	207.5
1912	196	207.5
1922	239	221.5
1923	218	221.5
1924	219	221.5
1925	216	221.5
1926	200	221.5
1927	251	221.5
1928	206	221.5
1929	223	221.5
1930	198	214.7
1931	202	214.7
1932	212	214.7
1933	236	214.7
1934	229	214.7
1935	228	214.7
1936	190	214.7
1937	218	214.7
1938	219	214.7
1939	215	214.7
1940	228	225.1
1941	197	225.1
1942	232	225.1
1943	223	225.1
1944	248	225.1
1945	250	225.1
1946	238	225.1
1947	223	225.1
1948	212	225.1
1949	200	225.1
1950	238	208.2
1951	220	208.2
1952	203	208.2
1953	202	208.2
1954	202	208.2
1955	218	208.2
1957	216	208.2
1958	181	208.2
1959	194	208.2
1960	195	196.9
1961	204	196.9
1962	223	196.9
1963	211	196.9
1964	206	196.9
1965	202	196.9
1966	177	196.9
1967	178	196.9
1968	176	196.9
1971	214	203.4
1972	214	203.4
1973	202	203.4
1975	211	203.4
1976	175	203.4
1977	213	203.4
1978	205	203.4
1979	193	203.4
1980	189	213.2
1981	204	213.2
1982	214	213.2
1983	187	213.2
1984	215	213.2
1985	219	213.2
1986	220	213.2
1988	228	213.2
1989	243	213.2
1990	222	216.8
1991	225	216.8
1992	198	216.8
1994	222	216.8

For each year, a bar from the first to the last day at Mission 4 W meeting 30 C (86 F).

First to last qualifying date each year at Mission 4 W
Year	First date	Last date
1911	1911-01-09	1911-11-23
1912	1912-01-25	1912-11-12
1922	1922-01-18	1922-12-30
1923	1923-01-07	1923-12-29
1924	1924-02-03	1924-12-17
1925	1925-02-09	1925-12-03
1926	1926-01-20	1926-12-07
1927	1927-01-06	1927-12-29
1928	1928-01-16	1928-12-04
1929	1929-01-22	1929-12-15
1930	1930-02-07	1930-11-19
1931	1931-03-22	1931-12-29
1932	1932-01-14	1932-11-15
1933	1933-01-16	1933-12-26
1934	1934-02-15	1934-12-31
1935	1935-01-13	1935-11-26
1936	1936-01-15	1936-11-02
1937	1937-01-08	1937-11-18
1938	1938-01-17	1938-11-17
1939	1939-01-04	1939-12-23
1940	1940-01-11	1940-12-11
1941	1941-01-15	1941-11-19
1942	1942-01-26	1942-12-26
1943	1943-01-16	1943-11-06
1944	1944-01-25	1944-12-25
1945	1945-01-27	1945-12-30
1946	1946-01-04	1946-12-28
1947	1947-01-14	1947-12-09
1948	1948-02-06	1948-12-29
1949	1949-01-09	1949-12-22
1950	1950-01-14	1950-12-16
1951	1951-01-05	1951-12-31
1952	1952-01-01	1952-11-18
1953	1953-01-08	1953-12-06
1954	1954-01-21	1954-12-28
1955	1955-02-05	1955-12-25
1957	1957-01-07	1957-11-18
1958	1958-02-27	1958-11-18
1959	1959-02-18	1959-11-27
1960	1960-01-13	1960-11-28
1961	1961-02-18	1961-11-03
1962	1962-01-23	1962-11-18
1963	1963-01-11	1963-11-09
1964	1964-03-04	1964-12-30
1965	1965-01-09	1965-11-27
1966	1966-02-10	1966-12-23
1967	1967-01-25	1967-11-27
1968	1968-03-10	1968-12-28
1971	1971-01-14	1971-12-15
1972	1972-01-23	1972-12-10
1973	1973-03-07	1973-12-31
1975	1975-01-27	1975-12-16
1976	1976-01-02	1976-11-12
1977	1977-02-24	1977-12-17
1978	1978-01-17	1978-12-21
1979	1979-02-14	1979-11-28
1980	1980-02-09	1980-11-13
1981	1981-02-11	1981-12-23
1982	1982-01-02	1982-12-25
1983	1983-02-20	1983-12-13
1984	1984-02-12	1984-12-22
1985	1985-01-01	1985-12-01
1986	1986-01-01	1986-11-24
1988	1988-02-29	1988-12-28
1989	1989-01-03	1989-11-28
1990	1990-01-19	1990-12-30
1991	1991-02-14	1991-12-01
1992	1992-02-16	1992-12-20
1994	1994-02-10	1994-11-28

Every Fixed Threshold

Fixed thresholds at Mission 4 W
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	69	251	1927	222
35 C (95 F): Days	69	143	1989	127
40 C (104 F): Days	42	27	1923	12
90 F (32.2 C): Days	69	208	1945	189
100 F (37.8 C): Days	69	84	1946	67
110 F (43.3 C): Days	3	1	1923	1
0 C (32 F): Ice days (max	4	2	1951	1
0 C (32 F): Frost days (min	53	17	1966	15
20 C (68 F): Tropical nights (min	60	199	1935	173
25 C (77 F): Days with min	60	34	1959	24
10 mm (0.39 in): Days with 10 mm or more rain	74	25	1976	13
25 mm (0.98 in): Days with 25 mm or more rain	74	13	1967	5
50 mm (1.97 in): Days with 50 mm or more rain	59	7	1967	1
100 mm (3.94 in): Days with 100 mm or more rain	16	3	1967	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1967	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1911.

Download the Data

Data for Mission 4 W 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).

Mission 4 W Threshold Days by Year (USC00415972)

Key Facts for Mission 4 W Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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