Mormon Flat Threshold Days by Year (USC00025700)

15 fixed thresholds counted per year at Mormon Flat (USC00025700): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mormon Flat Thresholds

Mormon Flat: days with 10 mm (0.39 in) or more of precipitation in 72 years, most in 1992 with 28.
Mormon Flat: days with 25 mm (0.98 in) or more of precipitation in 65 years, most in 1931 with 7.
Mormon Flat: days with a maximum temperature at or above 30 C (86 F) in 64 years, most in 1934 with 230.
Mormon Flat: days with a maximum temperature at or above 35 C (95 F) in 64 years, most in 1934 with 162.
15 fixed thresholds have at least one qualifying day at Mormon Flat.

Days at or above 30 C (86 F)

64 years with a qualifying day

Days per year at Mormon Flat with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 230 in 1934.

Days at or above 30 C (86 F) per year at Mormon Flat
Year	Days	Decade average
1926	181	169.8
1927	160	169.8
1928	167	169.8
1929	171	169.8
1930	155	180.6
1931	190	180.6
1932	170	180.6
1933	171	180.6
1934	230	180.6
1935	171	180.6
1936	187	180.6
1937	175	180.6
1938	182	180.6
1939	175	180.6
1940	179	173
1942	163	173
1943	188	173
1944	152	173
1945	159	173
1946	177	173
1947	181	173
1948	183	173
1949	175	173
1950	197	176.5
1951	158	176.5
1952	181	176.5
1953	174	176.5
1954	183	176.5
1955	171	176.5
1956	186	176.5
1957	154	176.5
1958	176	176.5
1959	185	176.5
1960	181	179.2
1961	179	179.2
1962	182	179.2
1963	189	179.2
1964	171	179.2
1965	175	179.2
1966	177	179.2
1967	178	179.2
1968	181	179.2
1970	147	174.8
1971	180	174.8
1972	181	174.8
1973	184	174.8
1974	185	174.8
1975	168	174.8
1977	179	174.8
1978	174	174.8
1980	122	165.2
1981	178	165.2
1982	172	165.2
1983	148	165.2
1984	166	165.2
1985	144	165.2
1986	167	165.2
1987	186	165.2
1988	192	165.2
1989	177	165.2
1990	189	181
1991	169	181
1992	185	181
2026	98	98

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

First to last qualifying date each year at Mormon Flat
Year	First date	Last date
1926	1926-03-01	1926-10-28
1927	1927-04-21	1927-10-23
1928	1928-03-22	1928-10-29
1929	1929-04-02	1929-10-24
1930	1930-04-05	1930-10-16
1931	1931-03-22	1931-11-05
1932	1932-04-01	1932-10-17
1933	1933-04-02	1933-10-30
1934	1934-03-05	1934-11-13
1935	1935-04-05	1935-10-18
1936	1936-04-10	1936-10-18
1937	1937-04-10	1937-11-06
1938	1938-04-11	1938-10-30
1939	1939-03-15	1939-11-07
1940	1940-03-22	1940-11-02
1942	1942-03-29	1942-11-08
1943	1943-03-26	1943-10-27
1944	1944-04-04	1944-11-04
1945	1945-04-07	1945-11-07
1946	1946-03-10	1946-10-27
1947	1947-03-27	1947-11-02
1948	1948-04-09	1948-10-27
1949	1949-04-07	1949-10-17
1950	1950-03-30	1950-11-24
1951	1951-03-25	1951-10-25
1952	1952-04-05	1952-11-02
1953	1953-03-26	1953-11-14
1954	1954-04-08	1954-11-12
1955	1955-04-15	1955-11-06
1956	1956-03-19	1956-10-23
1957	1957-02-14	1957-10-11
1958	1958-04-16	1958-11-07
1959	1959-04-02	1959-10-29
1960	1960-03-20	1960-11-03
1961	1961-03-24	1961-10-27
1962	1962-03-27	1962-11-14
1963	1963-02-05	1963-10-31
1964	1964-03-30	1964-10-30
1965	1965-04-01	1965-11-08
1966	1966-03-31	1966-11-02
1967	1967-03-17	1967-11-16
1968	1968-03-30	1968-10-30
1970	1970-04-07	1970-10-16
1971	1971-03-24	1971-10-16
1972	1972-02-28	1972-10-16
1973	1973-04-13	1973-11-13
1974	1974-03-17	1974-10-26
1975	1975-04-22	1975-11-06
1977	1977-02-21	1977-11-04
1978	1978-03-27	1978-10-31
1980	1980-04-17	1980-11-11
1981	1981-03-26	1981-10-29
1982	1982-04-12	1982-10-26
1983	1983-04-17	1983-11-02
1984	1984-03-20	1984-10-11
1985	1985-04-02	1985-10-29
1986	1986-02-24	1986-10-30
1987	1987-04-02	1987-10-28
1988	1988-03-20	1988-11-07
1989	1989-03-07	1989-11-11
1990	1990-03-20	1990-10-31
1991	1991-04-04	1991-11-06
1992	1992-04-07	1992-11-02
2026	2026-02-27	2026-10-12

Every Fixed Threshold

Fixed thresholds at Mormon Flat
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	64	230	1934	98
35 C (95 F): Days	64	162	1934	74
40 C (104 F): Days	64	80	1933	32
45 C (113 F): Days	44	11	1933	2
90 F (32.2 C): Days	64	205	1934	88
100 F (37.8 C): Days	64	116	1934	57
110 F (43.3 C): Days	63	32	1933	13
120 F (48.9 C): Days	1	1	1970	1
0 C (32 F): Frost days (min	56	29	1949	2
20 C (68 F): Tropical nights (min	64	152	1934	67
25 C (77 F): Days with min	64	97	1933	32
10 mm (0.39 in): Days with 10 mm or more rain	72	28	1992	4
25 mm (0.98 in): Days with 25 mm or more rain	65	7	1931	2
50 mm (1.97 in): Days with 50 mm or more rain	24	2	1926	1
100 mm (3.94 in): Days with 100 mm or more rain	2	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 1926.

Download the Data

Data for Mormon Flat 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Mormon Flat Threshold Days by Year (USC00025700)

Key Facts for Mormon Flat Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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