Istanbul Threshold Days by Year (TU000017062)

9 fixed thresholds counted per year at Istanbul (TU000017062): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Istanbul Thresholds

Istanbul: days with a maximum temperature at or above 30 C (86 F) in 75 years, most in 1932 with 66.
Istanbul: nights with a minimum temperature at or below 0 C (32 F) in 75 years, most in 1929 with 55.
Istanbul: nights with a minimum temperature at or above 20 C (68 F) in 75 years, most in 2002 with 63.
Istanbul: days with a maximum temperature at or above 90 F (32.2 C) in 73 years, most in 1946 with 30.
9 fixed thresholds have at least one qualifying day at Istanbul.

Days at or above 30 C (86 F)

75 years with a qualifying day

Days per year at Istanbul with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 66 in 1932.

Days at or above 30 C (86 F) per year at Istanbul
Year	Days	Decade average
1929	39	39
1930	18	27.7
1931	38	27.7
1932	66	27.7
1933	5	27.7
1934	31	27.7
1935	14	27.7
1936	18	27.7
1937	33	27.7
1938	29	27.7
1939	25	27.7
1940	10	21.4
1941	12	21.4
1942	17	21.4
1943	10	21.4
1944	17	21.4
1945	36	21.4
1946	66	21.4
1947	28	21.4
1948	15	21.4
1949	3	21.4
1950	25	26.5
1951	14	26.5
1952	35	26.5
1953	15	26.5
1954	48	26.5
1955	17	26.5
1956	29	26.5
1957	35	26.5
1958	23	26.5
1959	24	26.5
1960	19	26
1961	32	26
1962	38	26
1963	43	26
1964	12	26
1965	16	26
1966	34	26
1967	25	26
1968	23	26
1969	18	26
1970	21	18.9
1971	17	18.9
1972	31	18.9
1973	10	18.9
1974	17	18.9
1975	23	18.9
1976	8	18.9
1977	18	18.9
1978	19	18.9
1979	25	18.9
1980	17	17.1
1981	14	17.1
1982	12	17.1
1983	12	17.1
1984	15	17.1
1985	11	17.1
1986	23	17.1
1987	17	17.1
1988	31	17.1
1989	19	17.1
1990	15	22.7
1991	16	22.7
1992	23	22.7
1993	22	22.7
1994	39	22.7
1995	16	22.7
1996	23	22.7
1997	13	22.7
1998	30	22.7
1999	30	22.7
2000	38	41.8
2001	47	41.8
2002	38	41.8
2003	44	41.8

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

First to last qualifying date each year at Istanbul
Year	First date	Last date
1929	1929-05-02	1929-09-05
1930	1930-06-27	1930-09-08
1931	1931-07-06	1931-09-14
1932	1932-05-28	1932-10-17
1933	1933-06-24	1933-08-23
1934	1934-04-26	1934-09-04
1935	1935-05-25	1935-09-06
1936	1936-07-18	1936-09-07
1937	1937-06-14	1937-09-23
1938	1938-06-30	1938-09-06
1939	1939-05-21	1939-08-26
1940	1940-05-31	1940-08-23
1941	1941-05-31	1941-08-31
1942	1942-05-15	1942-08-15
1943	1943-07-07	1943-08-29
1944	1944-06-20	1944-09-10
1945	1945-05-24	1945-09-26
1946	1946-06-04	1946-09-21
1947	1947-06-06	1947-08-28
1948	1948-05-24	1948-09-05
1949	1949-06-12	1949-06-26
1950	1950-05-27	1950-09-10
1951	1951-07-06	1951-08-17
1952	1952-06-15	1952-09-20
1953	1953-07-11	1953-08-28
1954	1954-06-05	1954-09-23
1955	1955-05-29	1955-09-16
1956	1956-06-10	1956-09-09
1957	1957-06-21	1957-09-16
1958	1958-05-12	1958-08-26
1959	1959-07-01	1959-08-31
1960	1960-06-11	1960-10-12
1961	1961-06-27	1961-09-09
1962	1962-05-31	1962-09-09
1963	1963-06-16	1963-10-05
1964	1964-06-04	1964-08-23
1965	1965-06-10	1965-09-13
1966	1966-06-30	1966-08-27
1967	1967-06-28	1967-08-18
1968	1968-05-23	1968-09-19
1969	1969-05-20	1969-09-16
1970	1970-04-12	1970-08-25
1971	1971-05-23	1971-09-16
1972	1972-06-12	1972-09-18
1973	1973-06-24	1973-07-27
1974	1974-06-11	1974-10-16
1975	1975-05-25	1975-08-19
1976	1976-06-17	1976-07-29
1977	1977-06-15	1977-09-21
1978	1978-06-12	1978-09-07
1979	1979-06-09	1979-09-26
1980	1980-05-30	1980-08-17
1981	1981-06-07	1981-08-11
1982	1982-06-13	1982-09-11
1983	1983-06-29	1983-09-18
1984	1984-06-05	1984-10-07
1985	1985-05-23	1985-08-20
1986	1986-06-06	1986-08-30
1987	1987-06-10	1987-09-16
1988	1988-06-26	1988-09-16
1989	1989-05-15	1989-09-04
1990	1990-05-26	1990-09-02
1991	1991-06-29	1991-10-21
1992	1992-06-12	1992-10-07
1993	1993-06-13	1993-10-04
1994	1994-04-13	1994-09-28
1995	1995-05-13	1995-09-06
1996	1996-06-22	1996-09-23
1997	1997-05-22	1997-08-02
1998	1998-06-12	1998-09-15
1999	1999-06-22	1999-08-22
2000	2000-06-14	2000-09-22
2001	2001-06-01	2001-09-25
2002	2002-06-09	2002-09-24
2003	2003-06-12	2003-10-06

Every Fixed Threshold

Fixed thresholds at Istanbul
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	75	66	1932	44
35 C (95 F): Days	35	4	1945	2
40 C (104 F): Days	1	1	1970	1
90 F (32.2 C): Days	73	30	1946	14
100 F (37.8 C): Days	7	1	1945	1
0 C (32 F): Ice days (max	29	8	1929	1
0 C (32 F): Frost days (min	75	55	1929	27
20 C (68 F): Tropical nights (min	75	63	2002	55
25 C (77 F): Days with min	5	3	1998	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1929.

Download the Data

Data for Istanbul 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).

Istanbul Threshold Days by Year (TU000017062)

Key Facts for Istanbul Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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