Pontiac Wwtp Threshold Days by Year (USC00206658)

18 fixed thresholds counted per year at Pontiac Wwtp (USC00206658): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Pontiac Wwtp Thresholds

Pontiac Wwtp: days with 10 mm (0.39 in) or more of precipitation in 106 years, most in 1990 with 40.
Pontiac Wwtp: days with 25 mm (0.98 in) or more of precipitation in 105 years, most in 2024 with 13.
Pontiac Wwtp: nights with a minimum temperature at or below 0 C (32 F) in 102 years, most in 1976 with 167.
Pontiac Wwtp: nights with a minimum temperature at or below -10 C (14 F) in 102 years, most in 1912 with 68.
18 fixed thresholds have at least one qualifying day at Pontiac Wwtp.

Days at or above 30 C (86 F)

98 years with a qualifying day

Days per year at Pontiac Wwtp with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 58 in 1908.

Days at or above 30 C (86 F) per year at Pontiac Wwtp
Year	Days	Decade average
1895	39	29
1896	19	29
1908	58	39
1909	20	39
1910	36	26.8
1911	42	26.8
1912	15	26.8
1913	28	26.8
1914	17	26.8
1915	2	26.8
1916	42	26.8
1917	14	26.8
1918	34	26.8
1919	38	26.8
1920	17	24.3
1921	43	24.3
1922	36	24.3
1923	21	24.3
1924	12	24.3
1925	31	24.3
1927	14	24.3
1928	17	24.3
1929	28	24.3
1930	32	33.8
1931	49	33.8
1932	13	33.8
1933	45	33.8
1936	48	33.8
1937	36	33.8
1938	21	33.8
1939	26	33.8
1940	25	28.1
1941	41	28.1
1942	18	28.1
1943	22	28.1
1944	48	28.1
1945	19	28.1
1946	25	28.1
1947	24	28.1
1948	24	28.1
1949	35	28.1
1950	22	34.8
1951	27	34.8
1952	55	34.8
1953	45	34.8
1954	40	34.8
1955	52	34.8
1956	18	34.8
1957	20	34.8
1958	20	34.8
1959	49	34.8
1960	24	29.4
1961	30	29.4
1962	25	29.4
1963	38	29.4
1964	46	29.4
1965	22	29.4
1966	43	29.4
1967	13	29.4
1968	27	29.4
1969	26	29.4
1970	23	30.7
1971	47	30.7
1972	11	30.7
1973	27	30.7
1974	21	30.7
1975	38	30.7
1976	31	30.7
1977	36	30.7
1978	50	30.7
1979	23	30.7
1980	25	29.8
1981	21	29.8
1982	20	29.8
1983	51	29.8
1984	36	29.8
1985	19	29.8
1986	22	29.8
1987	49	29.8
1989	25	29.8
1990	20	19.3
1991	41	19.3
1992	6	19.3
1993	19	19.3
1994	15	19.3
1995	22	19.3
1997	12	19.3
2012	36	29.5
2013	18	29.5
2018	30	29.5
2019	34	29.5
2020	43	33.6
2021	38	33.6
2022	31	33.6
2023	22	33.6
2024	28	33.6
2025	41	33.6
2026	32	33.6

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

First to last qualifying date each year at Pontiac Wwtp
Year	First date	Last date
1895	1895-05-04	1895-09-22
1896	1896-05-08	1896-08-11
1908	1908-05-12	1908-10-17
1909	1909-07-01	1909-09-14
1910	1910-06-15	1910-10-03
1911	1911-05-17	1911-09-02
1912	1912-06-28	1912-09-10
1913	1913-06-15	1913-09-07
1914	1914-05-26	1914-09-21
1915	1915-07-16	1915-09-14
1916	1916-07-02	1916-09-12
1917	1917-07-21	1917-08-20
1918	1918-05-31	1918-08-26
1919	1919-05-30	1919-09-09
1920	1920-06-10	1920-09-26
1921	1921-05-21	1921-09-02
1922	1922-06-07	1922-09-09
1923	1923-06-01	1923-09-05
1924	1924-06-20	1924-08-31
1925	1925-04-23	1925-09-09
1927	1927-06-29	1927-09-18
1928	1928-07-07	1928-08-30
1929	1929-05-29	1929-09-05
1930	1930-05-10	1930-09-13
1931	1931-05-29	1931-09-22
1932	1932-06-22	1932-09-01
1933	1933-06-06	1933-09-24
1936	1936-05-09	1936-09-23
1937	1937-05-31	1937-09-04
1938	1938-06-22	1938-08-20
1939	1939-05-31	1939-09-16
1940	1940-06-07	1940-09-21
1941	1941-05-21	1941-09-22
1942	1942-05-30	1942-09-14
1943	1943-06-12	1943-09-04
1944	1944-05-26	1944-09-19
1945	1945-06-14	1945-09-08
1946	1946-06-25	1946-09-28
1947	1947-06-10	1947-09-11
1948	1948-06-04	1948-09-19
1949	1949-05-04	1949-08-27
1950	1950-06-23	1950-08-28
1951	1951-05-16	1951-10-05
1952	1952-05-05	1952-09-14
1953	1953-05-30	1953-10-03
1954	1954-06-09	1954-09-07
1955	1955-05-03	1955-09-20
1956	1956-06-11	1956-09-04
1957	1957-06-16	1957-08-16
1958	1958-06-30	1958-09-04
1959	1959-05-06	1959-09-23
1960	1960-04-23	1960-09-09
1961	1961-06-12	1961-09-11
1962	1962-05-14	1962-08-30
1963	1963-06-02	1963-10-07
1964	1964-05-22	1964-09-10
1965	1965-06-06	1965-09-19
1966	1966-05-27	1966-09-02
1967	1967-06-12	1967-08-17
1968	1968-06-06	1968-08-24
1969	1969-05-28	1969-09-06
1970	1970-06-08	1970-09-21
1971	1971-05-18	1971-09-10
1972	1972-06-14	1972-08-18
1973	1973-06-10	1973-09-05
1974	1974-07-03	1974-08-27
1975	1975-05-19	1975-08-13
1976	1976-06-08	1976-09-09
1977	1977-05-16	1977-09-01
1978	1978-05-26	1978-09-21
1979	1979-05-08	1979-08-30
1980	1980-04-22	1980-08-29
1981	1981-06-08	1981-08-20
1982	1982-05-18	1982-09-14
1983	1983-06-11	1983-09-18
1984	1984-06-06	1984-09-22
1985	1985-06-09	1985-09-09
1986	1986-05-30	1986-08-17
1987	1987-05-10	1987-08-17
1989	1989-06-07	1989-08-17
1990	1990-04-25	1990-09-07
1991	1991-05-12	1991-09-16
1992	1992-06-13	1992-08-11
1993	1993-06-24	1993-08-31
1994	1994-06-15	1994-09-15
1995	1995-06-18	1995-08-31
1997	1997-06-13	1997-07-27
2012	2012-05-04	2012-09-04
2013	2013-05-21	2013-09-12
2018	2018-05-25	2018-09-06
2019	2019-06-27	2019-09-22
2020	2020-05-25	2020-08-28
2021	2021-05-21	2021-09-15
2022	2022-05-13	2022-09-04
2023	2023-05-29	2023-09-06
2024	2024-05-19	2024-08-31
2025	2025-06-12	2025-10-05
2026	2026-05-19	2026-10-14

Every Fixed Threshold

Fixed thresholds at Pontiac Wwtp
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	98	58	1908	32
35 C (95 F): Days	49	13	1930	5
40 C (104 F): Days	1	1	1936	1
90 F (32.2 C): Days	97	33	1952	9
100 F (37.8 C): Days	10	7	1936	1
0 C (32 F): Ice days (max	98	81	1920	35
0 C (32 F): Frost days (min	102	167	1976	77
-10 C (14 F): Days with min	102	68	1912	32
-20 C (-4 F): Days with min	77	16	1912	2
-30 C (-22 F): Days with min	1	1	1918	1
20 C (68 F): Tropical nights (min	102	29	1983	24
25 C (77 F): Days with min	20	3	2025	3
10 mm (0.39 in): Days with 10 mm or more rain	106	40	1990	22
25 mm (0.98 in): Days with 25 mm or more rain	105	13	2024	3
50 mm (1.97 in): Days with 50 mm or more rain	50	3	1972	1
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1968	1
10 cm (3.9 in): Days with 10 cm or more snowfall	80	6	1921	1
25 cm (9.8 in): Days with 25 cm or more snowfall	6	1	1908	1

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 Pontiac Wwtp 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Pontiac Wwtp Threshold Days by Year (USC00206658)

Key Facts for Pontiac Wwtp Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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