Tropic Threshold Days by Year

15 fixed thresholds counted per year at Tropic (USC00428847): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Tropic Thresholds

Tropic: nights with a minimum temperature at or below 0 C (32 F) in 64 years, most in 1900 with 216.
Tropic: nights with a minimum temperature at or below -10 C (14 F) in 64 years, most in 1975 with 70.
Tropic: days with a maximum temperature at or above 30 C (86 F) in 62 years, most in 1996 with 66.
Tropic: days with a maximum temperature at or below 0 C (32 F) in 61 years, most in 1949 with 35.
15 fixed thresholds have at least one qualifying day at Tropic.

Days at or above 30 C (86 F)

62 years with a qualifying day

Days per year at Tropic with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 66 in 1996.

Days at or above 30 C (86 F) per year at Tropic
Year	Days	Decade average
1893	42	42
1900	50	31.5
1904	19	31.5
1905	31	31.5
1906	28	31.5
1907	26	31.5
1909	35	31.5
1913	13	11.7
1914	9	11.7
1915	13	11.7
1936	59	52.3
1938	43	52.3
1939	55	52.3
1940	57	33.6
1942	34	33.6
1943	26	33.6
1944	38	33.6
1945	28	33.6
1946	26	33.6
1947	31	33.6
1948	32	33.6
1949	30	33.6
1952	18	32.3
1953	41	32.3
1954	33	32.3
1955	32	32.3
1956	35	32.3
1957	26	32.3
1958	33	32.3
1959	40	32.3
1960	60	31.8
1961	32	31.8
1965	12	31.8
1968	18	31.8
1969	37	31.8
1970	40	34
1971	43	34
1972	38	34
1973	34	34
1974	38	34
1975	21	34
1976	23	34
1977	42	34
1978	32	34
1979	29	34
1980	30	24.4
1981	36	24.4
1982	12	24.4
1983	12	24.4
1984	18	24.4
1985	34	24.4
1986	23	24.4
1987	17	24.4
1988	37	24.4
1989	25	24.4
1990	49	39
1991	32	39
1992	31	39
1993	18	39
1994	54	39
1996	66	39
1997	23	39

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

First to last qualifying date each year at Tropic
Year	First date	Last date
1893	1893-06-06	1893-08-25
1900	1900-05-26	1900-08-03
1904	1904-07-10	1904-09-10
1905	1905-06-23	1905-09-01
1906	1906-06-11	1906-08-15
1907	1907-06-28	1907-09-22
1909	1909-06-03	1909-08-31
1913	1913-06-20	1913-08-06
1914	1914-06-27	1914-09-11
1915	1915-06-30	1915-08-28
1936	1936-05-25	1936-09-25
1938	1938-05-13	1938-09-26
1939	1939-05-29	1939-08-31
1940	1940-06-11	1940-09-01
1942	1942-06-16	1942-08-18
1943	1943-06-27	1943-09-12
1944	1944-06-29	1944-09-13
1945	1945-06-20	1945-09-11
1946	1946-06-04	1946-08-09
1947	1947-05-03	1947-09-15
1948	1948-06-25	1948-09-13
1949	1949-06-15	1949-09-21
1952	1952-07-02	1952-09-03
1953	1953-06-13	1953-09-12
1954	1954-06-19	1954-09-02
1955	1955-06-07	1955-09-07
1956	1956-05-24	1956-09-17
1957	1957-06-04	1957-09-08
1958	1958-06-22	1958-09-07
1959	1959-06-07	1959-09-08
1960	1960-06-02	1960-09-12
1961	1961-06-15	1961-08-23
1965	1965-07-03	1965-08-14
1968	1968-06-17	1968-07-22
1969	1969-05-30	1969-08-28
1970	1970-06-21	1970-08-31
1971	1971-06-16	1971-09-14
1972	1972-05-29	1972-08-23
1973	1973-06-11	1973-08-20
1974	1974-05-29	1974-09-09
1975	1975-06-14	1975-08-10
1976	1976-06-28	1976-08-31
1977	1977-06-02	1977-09-10
1978	1978-06-21	1978-08-12
1979	1979-06-26	1979-09-10
1980	1980-06-28	1980-08-13
1981	1981-06-07	1981-08-27
1982	1982-06-27	1982-08-07
1983	1983-05-29	1983-08-07
1984	1984-05-30	1984-08-10
1985	1985-06-07	1985-09-02
1986	1986-06-23	1986-08-19
1987	1987-06-13	1987-08-06
1988	1988-06-17	1988-09-10
1989	1989-06-16	1989-08-14
1990	1990-06-05	1990-09-16
1991	1991-07-03	1991-09-05
1992	1992-06-23	1992-08-22
1993	1993-06-16	1993-08-20
1994	1994-06-11	1994-08-30
1996	1996-05-12	1996-09-04
1997	1997-06-01	1997-08-20

Every Fixed Threshold

Fixed thresholds at Tropic
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	62	66	1996	23
35 C (95 F): Days	23	13	1900	13
90 F (32.2 C): Days	59	39	1996	7
100 F (37.8 C): Days	3	1	1909	1
0 C (32 F): Ice days (max	61	35	1949	10
0 C (32 F): Frost days (min	64	216	1900	163
-10 C (14 F): Days with min	64	70	1975	16
-20 C (-4 F): Days with min	25	13	1913	1
20 C (68 F): Tropical nights (min	3	1	1900	1
10 mm (0.39 in): Days with 10 mm or more rain	60	17	1957	9
25 mm (0.98 in): Days with 25 mm or more rain	43	5	1972	2
50 mm (1.97 in): Days with 50 mm or more rain	4	1	1900	1
10 cm (3.9 in): Days with 10 cm or more snowfall	35	11	1979	1
25 cm (9.8 in): Days with 25 cm or more snowfall	15	4	1979	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1943	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1893.

Download the Data

Data for Tropic 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).

Tropic Threshold Days by Year

Key Facts for Tropic Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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