Port Clinton Threshold Days by Year

17 fixed thresholds counted per year at Port Clinton (USC00367116): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Port Clinton Thresholds

Port Clinton: days with a maximum temperature at or above 30 C (86 F) in 39 years, most in 1941 with 67.
Port Clinton: days with a maximum temperature at or above 90 F (32.2 C) in 39 years, most in 1966 with 37.
Port Clinton: days with a maximum temperature at or below 0 C (32 F) in 39 years, most in 1948 with 43.
Port Clinton: nights with a minimum temperature at or below 0 C (32 F) in 38 years, most in 1966 with 187.
17 fixed thresholds have at least one qualifying day at Port Clinton.

Days at or above 30 C (86 F)

39 years with a qualifying day

Days per year at Port Clinton with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 67 in 1941.

Days at or above 30 C (86 F) per year at Port Clinton
Year	Days	Decade average
1939	59	59
1940	37	40.2
1941	67	40.2
1942	36	40.2
1943	54	40.2
1944	47	40.2
1945	28	40.2
1946	26	40.2
1947	28	40.2
1948	33	40.2
1949	46	40.2
1950	28	42.7
1951	39	42.7
1952	46	42.7
1953	44	42.7
1954	36	42.7
1956	32	42.7
1957	58	42.7
1958	37	42.7
1959	64	42.7
1960	25	40.5
1961	41	40.5
1962	30	40.5
1963	27	40.5
1964	48	40.5
1965	47	40.5
1966	61	40.5
1967	29	40.5
1968	50	40.5
1969	47	40.5
1970	51	39.4
1971	41	39.4
1972	37	39.4
1973	46	39.4
1974	35	39.4
1975	38	39.4
1976	34	39.4
1977	38	39.4
1978	35	39.4

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

First to last qualifying date each year at Port Clinton
Year	First date	Last date
1939	1939-05-06	1939-10-10
1940	1940-05-14	1940-09-21
1941	1941-04-14	1941-10-07
1942	1942-04-30	1942-09-18
1943	1943-05-08	1943-09-07
1944	1944-05-04	1944-09-03
1945	1945-06-14	1945-09-07
1946	1946-06-08	1946-09-19
1947	1947-06-11	1947-09-14
1948	1948-05-11	1948-09-19
1949	1949-05-06	1949-10-10
1950	1950-06-08	1950-09-02
1951	1951-05-16	1951-10-06
1952	1952-06-07	1952-09-14
1953	1953-05-12	1953-09-05
1954	1954-06-12	1954-10-14
1956	1956-04-30	1956-08-30
1957	1957-04-28	1957-09-23
1958	1958-06-30	1958-09-27
1959	1959-05-08	1959-10-07
1960	1960-04-24	1960-09-02
1961	1961-06-03	1961-09-25
1962	1962-04-27	1962-09-02
1963	1963-05-10	1963-10-08
1964	1964-05-10	1964-09-24
1965	1965-05-04	1965-09-24
1966	1966-06-05	1966-09-04
1967	1967-06-03	1967-09-18
1968	1968-06-08	1968-09-26
1969	1969-04-28	1969-09-18
1970	1970-05-10	1970-09-27
1971	1971-05-20	1971-09-10
1972	1972-05-25	1972-09-27
1973	1973-04-23	1973-09-06
1974	1974-04-30	1974-09-14
1975	1975-05-21	1975-10-15
1976	1976-04-18	1976-09-15
1977	1977-04-13	1977-09-03
1978	1978-05-21	1978-09-08

Every Fixed Threshold

Fixed thresholds at Port Clinton
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	39	67	1941	35
35 C (95 F): Days	28	12	1966	2
40 C (104 F): Days	1	1	1966	1
90 F (32.2 C): Days	39	37	1966	10
100 F (37.8 C): Days	6	2	1953	1
0 C (32 F): Ice days (max	39	43	1948	40
0 C (32 F): Frost days (min	38	187	1966	159
-10 C (14 F): Days with min	38	61	1963	44
-20 C (-4 F): Days with min	21	16	1961	1
-30 C (-22 F): Days with min	1	1	1961	1
20 C (68 F): Tropical nights (min	28	15	1939	3
10 mm (0.39 in): Days with 10 mm or more rain	38	56	1975	39
25 mm (0.98 in): Days with 25 mm or more rain	38	23	1977	11
50 mm (1.97 in): Days with 50 mm or more rain	34	6	1962	4
100 mm (3.94 in): Days with 100 mm or more rain	5	1	1942	1
10 cm (3.9 in): Days with 10 cm or more snowfall	23	6	1966	1
25 cm (9.8 in): Days with 25 cm or more snowfall	6	2	1964	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1939.

Download the Data

Data for Port Clinton 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).

Port Clinton Threshold Days by Year

Key Facts for Port Clinton Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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