Clifton Threshold Days by Year

17 fixed thresholds counted per year at Clifton (USC00021849): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Clifton Thresholds

Clifton: days with 10 mm (0.39 in) or more of precipitation in 107 years, most in 2004 with 31.
Clifton: days with a maximum temperature at or above 30 C (86 F) in 91 years, most in 1934 with 211.
Clifton: days with a maximum temperature at or above 35 C (95 F) in 91 years, most in 1934 with 144.
Clifton: days with a maximum temperature at or above 40 C (104 F) in 91 years, most in 1937 with 52.
17 fixed thresholds have at least one qualifying day at Clifton.

Days at or above 30 C (86 F)

91 years with a qualifying day

Days per year at Clifton with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 211 in 1934.

Days at or above 30 C (86 F) per year at Clifton
Year	Days	Decade average
1909	155	155
1910	178	156.2
1911	159	156.2
1912	148	156.2
1913	162	156.2
1914	161	156.2
1915	126	156.2
1916	159	156.2
1917	155	156.2
1918	154	156.2
1919	160	156.2
1920	158	152.7
1921	164	152.7
1922	161	152.7
1923	148	152.7
1924	162	152.7
1925	162	152.7
1926	138	152.7
1927	150	152.7
1928	145	152.7
1929	139	152.7
1930	130	168
1931	145	168
1932	139	168
1933	134	168
1934	211	168
1935	164	168
1936	185	168
1937	193	168
1938	192	168
1939	187	168
1940	185	168.9
1941	156	168.9
1942	167	168.9
1943	153	168.9
1944	145	168.9
1945	184	168.9
1946	179	168.9
1947	171	168.9
1948	176	168.9
1949	173	168.9
1950	185	177.1
1951	173	177.1
1952	181	177.1
1953	167	177.1
1954	199	177.1
1955	184	177.1
1956	189	177.1
1957	149	177.1
1958	160	177.1
1959	184	177.1
1960	173	165.2
1961	178	165.2
1962	171	165.2
1963	175	165.2
1964	160	165.2
1965	162	165.2
1966	153	165.2
1967	161	165.2
1968	155	165.2
1969	164	165.2
1970	148	157.2
1971	157	157.2
1972	188	157.2
1973	153	157.2
1974	155	157.2
1975	142	157.2
1976	150	157.2
1977	152	157.2
1978	170	157.2
1981	142	152.1
1982	136	152.1
1984	156	152.1
1985	147	152.1
1986	149	152.1
1987	167	152.1
1988	155	152.1
1989	165	152.1
1990	134	153.3
1991	157	153.3
1992	153	153.3
1993	151	153.3
1994	155	153.3
1995	166	153.3
1999	157	153.3
2001	157	148.2
2002	168	148.2
2003	162	148.2
2004	127	148.2
2005	124	148.2
2007	151	148.2

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

First to last qualifying date each year at Clifton
Year	First date	Last date
1909	1909-04-14	1909-10-21
1910	1910-03-02	1910-10-26
1911	1911-03-31	1911-10-16
1912	1912-04-24	1912-10-20
1913	1913-03-31	1913-10-25
1914	1914-04-02	1914-10-12
1915	1915-04-13	1915-11-01
1916	1916-03-10	1916-10-09
1917	1917-04-20	1917-10-22
1918	1918-04-25	1918-10-17
1919	1919-04-13	1919-09-30
1920	1920-04-30	1920-10-11
1921	1921-03-16	1921-10-22
1922	1922-04-21	1922-10-12
1923	1923-04-29	1923-10-10
1924	1924-04-23	1924-10-19
1925	1925-03-21	1925-10-09
1926	1926-04-23	1926-10-16
1927	1927-04-23	1927-10-15
1928	1928-04-28	1928-10-10
1929	1929-05-03	1929-10-21
1930	1930-04-05	1930-09-30
1931	1931-04-19	1931-10-15
1932	1932-04-13	1932-10-15
1933	1933-05-16	1933-10-03
1934	1934-03-06	1934-11-12
1935	1935-04-13	1935-11-02
1936	1936-03-19	1936-10-19
1937	1937-04-10	1937-11-08
1938	1938-03-11	1938-10-31
1939	1939-03-16	1939-10-29
1940	1940-03-22	1940-10-28
1941	1941-05-03	1941-10-28
1942	1942-04-01	1942-10-11
1943	1943-03-28	1943-10-28
1944	1944-04-05	1944-10-30
1945	1945-04-18	1945-11-04
1946	1946-03-30	1946-10-25
1947	1947-04-15	1947-10-21
1948	1948-04-09	1948-10-19
1949	1949-04-17	1949-10-15
1950	1950-03-31	1950-10-31
1951	1951-04-22	1951-10-25
1952	1952-04-04	1952-10-29
1953	1953-03-27	1953-10-19
1954	1954-04-04	1954-10-25
1955	1955-04-15	1955-11-03
1956	1956-03-22	1956-10-23
1957	1957-02-13	1957-10-10
1958	1958-04-18	1958-10-20
1959	1959-04-02	1959-10-27
1960	1960-03-21	1960-10-10
1961	1961-04-03	1961-10-23
1962	1962-04-12	1962-10-17
1963	1963-03-28	1963-10-17
1964	1964-03-30	1964-10-31
1965	1965-04-16	1965-10-25
1966	1966-03-31	1966-10-31
1967	1967-03-17	1967-10-25
1968	1968-04-30	1968-10-29
1969	1969-04-05	1969-10-17
1970	1970-05-04	1970-10-14
1971	1971-03-22	1971-10-21
1972	1972-02-28	1972-10-17
1973	1973-04-26	1973-10-27
1974	1974-03-17	1974-10-19
1975	1975-04-23	1975-10-20
1976	1976-04-10	1976-10-20
1977	1977-04-08	1977-10-26
1978	1978-04-01	1978-10-20
1981	1981-04-26	1981-10-01
1982	1982-04-28	1982-10-07
1984	1984-04-13	1984-10-11
1985	1985-04-08	1985-10-28
1986	1986-02-27	1986-10-11
1987	1987-03-14	1987-10-29
1988	1988-03-22	1988-10-20
1989	1989-03-11	1989-10-17
1990	1990-04-12	1990-10-28
1991	1991-04-05	1991-10-20
1992	1992-04-11	1992-10-20
1993	1993-04-21	1993-10-11
1994	1994-04-15	1994-10-13
1995	1995-04-13	1995-10-21
1999	1999-04-18	1999-10-26
2001	2001-03-22	2001-11-03
2002	2002-03-31	2002-10-11
2003	2003-03-26	2003-10-23
2004	2004-03-20	2004-10-08
2005	2005-04-14	2005-10-22
2007	2007-03-14	2007-10-26

Every Fixed Threshold

Fixed thresholds at Clifton
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	91	211	1934	151
35 C (95 F): Days	91	144	1934	84
40 C (104 F): Days	91	52	1937	23
45 C (113 F): Days	11	5	1994	2
90 F (32.2 C): Days	91	187	1934	122
100 F (37.8 C): Days	91	107	1953	47
110 F (43.3 C): Days	34	11	1940	4
0 C (32 F): Ice days (max	1	1	1949	1
0 C (32 F): Frost days (min	82	94	1964	37
-10 C (14 F): Days with min	7	3	1978	3
20 C (68 F): Tropical nights (min	82	120	1910	96
25 C (77 F): Days with min	75	37	1922	11
10 mm (0.39 in): Days with 10 mm or more rain	107	31	2004	13
25 mm (0.98 in): Days with 25 mm or more rain	89	6	2007	6
50 mm (1.97 in): Days with 50 mm or more rain	11	2	1945	1
10 cm (3.9 in): Days with 10 cm or more snowfall	7	2	1923	1
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	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 1909.

Download the Data

Data for Clifton 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

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

Clifton Threshold Days by Year

Key Facts for Clifton Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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