Ontonagon Threshold Days by Year (USC00206210)

16 fixed thresholds counted per year at Ontonagon (USC00206210): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ontonagon Thresholds

Ontonagon: nights with a minimum temperature at or below 0 C (32 F) in 40 years, most in 1976 with 210.
Ontonagon: nights with a minimum temperature at or below -10 C (14 F) in 40 years, most in 1972 with 103.
Ontonagon: nights with a minimum temperature at or below -20 C (-4 F) in 40 years, most in 1972 with 43.
Ontonagon: days with a maximum temperature at or above 30 C (86 F) in 39 years, most in 1947 with 32.
16 fixed thresholds have at least one qualifying day at Ontonagon.

Days at or above 30 C (86 F)

39 years with a qualifying day

Days per year at Ontonagon with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 32 in 1947.

Days at or above 30 C (86 F) per year at Ontonagon
Year	Days	Decade average
1902	5	5
1939	10	10
1940	6	13.8
1941	13	13.8
1942	13	13.8
1943	6	13.8
1944	12	13.8
1945	7	13.8
1946	9	13.8
1947	32	13.8
1948	18	13.8
1949	22	13.8
1950	8	13
1951	7	13
1952	18	13
1953	19	13
1954	7	13
1955	25	13
1956	6	13
1957	6	13
1958	10	13
1959	24	13
1960	12	11.8
1961	17	11.8
1962	11	11.8
1963	16	11.8
1964	15	11.8
1965	7	11.8
1966	17	11.8
1967	3	11.8
1968	7	11.8
1969	13	11.8
1970	9	10.3
1971	7	10.3
1972	4	10.3
1973	11	10.3
1974	8	10.3
1975	17	10.3
1976	16	10.3

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

First to last qualifying date each year at Ontonagon
Year	First date	Last date
1902	1902-07-04	1902-08-28
1939	1939-05-30	1939-09-15
1940	1940-07-06	1940-09-19
1941	1941-05-18	1941-09-21
1942	1942-04-15	1942-09-11
1943	1943-06-24	1943-08-01
1944	1944-05-29	1944-08-11
1945	1945-07-23	1945-09-07
1946	1946-07-09	1946-08-07
1947	1947-06-26	1947-09-10
1948	1948-04-25	1948-09-16
1949	1949-05-03	1949-08-26
1950	1950-05-23	1950-08-16
1951	1951-05-01	1951-07-29
1952	1952-06-07	1952-09-14
1953	1953-06-15	1953-10-03
1954	1954-06-15	1954-08-25
1955	1955-05-03	1955-09-18
1956	1956-06-10	1956-06-21
1957	1957-06-17	1957-09-01
1958	1958-06-28	1958-09-23
1959	1959-05-05	1959-09-08
1960	1960-06-27	1960-09-07
1961	1961-06-28	1961-10-06
1962	1962-05-15	1962-08-28
1963	1963-06-04	1963-10-05
1964	1964-05-21	1964-08-02
1965	1965-05-25	1965-08-14
1966	1966-06-22	1966-08-17
1967	1967-07-21	1967-08-16
1968	1968-06-04	1968-08-16
1969	1969-05-27	1969-08-30
1970	1970-06-18	1970-09-07
1971	1971-06-18	1971-09-04
1972	1972-05-23	1972-08-31
1973	1973-07-07	1973-09-02
1974	1974-05-22	1974-08-21
1975	1975-05-24	1975-08-25
1976	1976-06-08	1976-09-13

Every Fixed Threshold

Fixed thresholds at Ontonagon
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	39	32	1947	16
35 C (95 F): Days	12	7	1947	3
90 F (32.2 C): Days	34	17	1947	6
100 F (37.8 C): Days	1	2	1947	2
0 C (32 F): Ice days (max	39	113	1972	94
0 C (32 F): Frost days (min	40	210	1976	210
-10 C (14 F): Days with min	40	103	1972	80
-20 C (-4 F): Days with min	40	43	1972	17
-30 C (-22 F): Days with min	12	3	1959	3
20 C (68 F): Tropical nights (min	35	10	1947	2
25 C (77 F): Days with min	2	1	1947	1
10 mm (0.39 in): Days with 10 mm or more rain	38	31	1951	10
25 mm (0.98 in): Days with 25 mm or more rain	37	10	1953	1
50 mm (1.97 in): Days with 50 mm or more rain	14	3	1972	2
10 cm (3.9 in): Days with 10 cm or more snowfall	34	17	1945	16
25 cm (9.8 in): Days with 25 cm or more snowfall	13	2	1945	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1902.

Download the Data

Data for Ontonagon 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).

Ontonagon Threshold Days by Year (USC00206210)

Key Facts for Ontonagon Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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