Detroit Threshold Days by Year (USC00352277)

15 fixed thresholds counted per year at Detroit (USC00352277): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Detroit Thresholds

Detroit: days with 10 mm (0.39 in) or more of precipitation in 53 years, most in 1950 with 97.
Detroit: days with 25 mm (0.98 in) or more of precipitation in 53 years, most in 1971 with 37.
Detroit: days with 50 mm (1.97 in) or more of precipitation in 52 years, most in 1946 with 11.
Detroit: days with 10 cm (3.9 in) or more of snowfall in 37 years, most in 1916 with 18.
15 fixed thresholds have at least one qualifying day at Detroit.

Days at or above 30 C (86 F)

35 years with a qualifying day

Days per year at Detroit with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 66 in 1967.

Days at or above 30 C (86 F) per year at Detroit
Year	Days	Decade average
1895	43	43
1937	21	28.5
1939	36	28.5
1940	32	25.8
1941	21	25.8
1942	35	25.8
1943	36	25.8
1944	24	25.8
1945	36	25.8
1946	25	25.8
1947	8	25.8
1948	17	25.8
1949	24	25.8
1950	35	34.7
1951	43	34.7
1952	51	34.7
1953	37	34.7
1954	6	34.7
1955	27	34.7
1956	35	34.7
1957	24	34.7
1958	57	34.7
1959	32	34.7
1960	39	33.3
1961	51	33.3
1962	32	33.3
1963	26	33.3
1964	18	33.3
1965	30	33.3
1966	27	33.3
1967	66	33.3
1968	24	33.3
1969	20	33.3
1970	40	31.5
1971	23	31.5

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

First to last qualifying date each year at Detroit
Year	First date	Last date
1895	1895-04-22	1895-08-29
1937	1937-05-02	1937-09-14
1939	1939-04-17	1939-09-22
1940	1940-04-12	1940-09-23
1941	1941-05-11	1941-08-19
1942	1942-05-21	1942-09-25
1943	1943-05-25	1943-09-25
1944	1944-06-28	1944-09-11
1945	1945-05-02	1945-09-12
1946	1946-06-19	1946-08-26
1947	1947-05-05	1947-09-21
1948	1948-05-24	1948-09-13
1949	1949-05-12	1949-09-28
1950	1950-06-04	1950-09-22
1951	1951-05-22	1951-09-22
1952	1952-05-28	1952-10-18
1953	1953-05-06	1953-09-21
1954	1954-05-18	1954-09-26
1955	1955-06-07	1955-09-07
1956	1956-05-17	1956-10-07
1957	1957-04-29	1957-09-24
1958	1958-05-16	1958-10-05
1959	1959-06-02	1959-09-11
1960	1960-06-03	1960-09-30
1961	1961-05-20	1961-09-14
1962	1962-06-20	1962-09-25
1963	1963-05-18	1963-09-28
1964	1964-06-23	1964-08-25
1965	1965-06-30	1965-09-25
1966	1966-05-04	1966-10-01
1967	1967-05-17	1967-09-29
1968	1968-06-19	1968-09-06
1969	1969-05-11	1969-09-12
1970	1970-05-26	1970-10-03
1971	1971-06-22	1971-08-29

Every Fixed Threshold

Fixed thresholds at Detroit
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	35	66	1967	23
35 C (95 F): Days	32	18	1961	6
40 C (104 F): Days	4	2	1961	2
90 F (32.2 C): Days	35	37	1958	10
100 F (37.8 C): Days	18	6	1961	2
0 C (32 F): Ice days (max	26	14	1950	5
0 C (32 F): Frost days (min	34	160	1955	144
-10 C (14 F): Days with min	26	19	1949	7
-20 C (-4 F): Days with min	1	2	1949	2
10 mm (0.39 in): Days with 10 mm or more rain	53	97	1950	89
25 mm (0.98 in): Days with 25 mm or more rain	53	37	1971	37
50 mm (1.97 in): Days with 50 mm or more rain	52	11	1946	8
100 mm (3.94 in): Days with 100 mm or more rain	9	1	1919	1
10 cm (3.9 in): Days with 10 cm or more snowfall	37	18	1916	15
25 cm (9.8 in): Days with 25 cm or more snowfall	20	4	1916	3

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1895.

Download the Data

Data for Detroit 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).

Detroit Threshold Days by Year (USC00352277)

Key Facts for Detroit Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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