Ottawa Threshold Days by Year (USC00146128)

21 fixed thresholds counted per year at Ottawa (USC00146128): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ottawa Thresholds

Ottawa: days with a maximum temperature at or above 30 C (86 F) in 128 years, most in 1953 with 124.
Ottawa: days with a maximum temperature at or above 90 F (32.2 C) in 128 years, most in 1953 with 98.
Ottawa: days with a maximum temperature at or below 0 C (32 F) in 128 years, most in 1978 with 50.
Ottawa: days with 10 mm (0.39 in) or more of precipitation in 128 years, most in 1915 with 45.
21 fixed thresholds have at least one qualifying day at Ottawa.

Days at or above 30 C (86 F)

128 years with a qualifying day

Days per year at Ottawa with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 124 in 1953.

Days at or above 30 C (86 F) per year at Ottawa
Year	Days	Decade average
1896	75	83
1897	93	83
1898	73	83
1899	91	83
1901	100	77.8
1902	65	77.8
1903	57	77.8
1904	60	77.8
1905	81	77.8
1906	75	77.8
1907	84	77.8
1908	82	77.8
1909	96	77.8
1910	87	82.1
1911	105	82.1
1912	79	82.1
1913	95	82.1
1914	83	82.1
1915	35	82.1
1916	86	82.1
1917	66	82.1
1918	90	82.1
1919	95	82.1
1920	66	70.2
1921	89	70.2
1922	84	70.2
1923	63	70.2
1924	55	70.2
1925	87	70.2
1926	78	70.2
1927	50	70.2
1928	61	70.2
1929	69	70.2
1930	83	96.1
1931	100	96.1
1932	92	96.1
1933	91	96.1
1934	105	96.1
1935	67	96.1
1936	114	96.1
1937	96	96.1
1938	99	96.1
1939	114	96.1
1940	79	73.7
1941	85	73.7
1942	69	73.7
1943	79	73.7
1944	78	73.7
1945	57	73.7
1946	69	73.7
1947	83	73.7
1948	75	73.7
1949	63	73.7
1950	49	88.9
1951	53	88.9
1952	111	88.9
1953	124	88.9
1954	111	88.9
1955	92	88.9
1956	117	88.9
1957	76	88.9
1958	64	88.9
1959	92	88.9
1960	75	76.3
1961	64	76.3
1962	88	76.3
1963	113	76.3
1964	74	76.3
1965	72	76.3
1966	72	76.3
1967	57	76.3
1968	74	76.3
1969	74	76.3
1970	88	82.7
1971	81	82.7
1972	80	82.7
1973	87	82.7
1974	67	82.7
1975	87	82.7
1976	82	82.7
1977	74	82.7
1978	98	82.7
1979	83	82.7
1980	120	84.2
1981	77	84.2
1982	67	84.2
1983	87	84.2
1984	86	84.2
1985	76	84.2
1986	80	84.2
1987	82	84.2
1988	98	84.2
1989	69	84.2
1990	83	80.1
1991	103	80.1
1992	52	80.1
1993	74	80.1
1994	89	80.1
1995	80	80.1
1996	71	80.1
1997	78	80.1
1998	100	80.1
1999	71	80.1
2001	84	71.1
2002	102	71.1
2003	79	71.1
2004	61	71.1
2006	82	71.1
2007	74	71.1
2008	47	71.1
2009	40	71.1
2010	79	75.3
2011	91	75.3
2012	91	75.3
2013	72	75.3
2014	60	75.3
2015	63	75.3
2016	75	75.3
2017	59	75.3
2018	95	75.3
2019	68	75.3
2020	79	76.4
2021	75	76.4
2022	83	76.4
2023	82	76.4
2024	53	76.4
2025	69	76.4
2026	94	76.4

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

First to last qualifying date each year at Ottawa
Year	First date	Last date
1896	1896-04-15	1896-10-01
1897	1897-04-18	1897-10-24
1898	1898-04-16	1898-10-04
1899	1899-04-28	1899-10-23
1901	1901-03-02	1901-10-01
1902	1902-04-20	1902-09-26
1903	1903-06-18	1903-10-02
1904	1904-05-22	1904-10-04
1905	1905-04-08	1905-09-28
1906	1906-04-11	1906-10-07
1907	1907-03-19	1907-10-02
1908	1908-05-15	1908-10-17
1909	1909-04-04	1909-10-08
1910	1910-03-22	1910-10-26
1911	1911-04-29	1911-10-05
1912	1912-05-02	1912-10-06
1913	1913-04-30	1913-10-05
1914	1914-05-11	1914-09-21
1915	1915-04-28	1915-09-13
1916	1916-03-21	1916-10-07
1917	1917-04-23	1917-09-18
1918	1918-05-08	1918-10-07
1919	1919-05-30	1919-10-03
1920	1920-05-22	1920-10-12
1921	1921-03-18	1921-10-09
1922	1922-05-05	1922-10-06
1923	1923-06-02	1923-09-10
1924	1924-04-15	1924-09-20
1925	1925-04-21	1925-10-03
1926	1926-04-17	1926-09-23
1927	1927-05-18	1927-10-28
1928	1928-03-23	1928-10-10
1929	1929-03-24	1929-09-28
1930	1930-04-09	1930-09-25
1931	1931-05-16	1931-10-10
1932	1932-05-13	1932-10-18
1933	1933-05-08	1933-09-30
1934	1934-04-10	1934-09-24
1935	1935-05-12	1935-09-24
1936	1936-04-13	1936-09-22
1937	1937-05-18	1937-10-29
1938	1938-04-30	1938-10-16
1939	1939-05-16	1939-10-26
1940	1940-03-31	1940-10-25
1941	1941-05-14	1941-09-23
1942	1942-04-04	1942-09-18
1943	1943-04-29	1943-09-05
1944	1944-05-12	1944-09-21
1945	1945-05-20	1945-09-23
1946	1946-03-31	1946-09-26
1947	1947-05-14	1947-10-20
1948	1948-04-18	1948-09-21
1949	1949-04-25	1949-10-08
1950	1950-04-22	1950-10-31
1951	1951-04-27	1951-10-03
1952	1952-04-29	1952-10-26
1953	1953-04-22	1953-10-19
1954	1954-04-06	1954-10-10
1955	1955-04-18	1955-09-21
1956	1956-03-05	1956-10-18
1957	1957-05-31	1957-09-18
1958	1958-04-23	1958-10-20
1959	1959-04-27	1959-09-27
1960	1960-05-22	1960-10-11
1961	1961-04-24	1961-09-11
1962	1962-04-29	1962-10-14
1963	1963-04-17	1963-10-19
1964	1964-05-16	1964-09-19
1965	1965-04-21	1965-10-10
1966	1966-03-31	1966-10-14
1967	1967-04-16	1967-10-04
1968	1968-05-01	1968-10-14
1969	1969-05-26	1969-10-04
1970	1970-04-27	1970-09-21
1971	1971-04-12	1971-10-12
1972	1972-04-12	1972-10-11
1973	1973-05-18	1973-10-08
1974	1974-05-13	1974-09-18
1975	1975-05-18	1975-10-13
1976	1976-06-03	1976-10-03
1977	1977-05-15	1977-09-27
1978	1978-04-08	1978-10-11
1979	1979-06-04	1979-10-11
1980	1980-04-20	1980-11-08
1981	1981-04-17	1981-10-05
1982	1982-04-12	1982-10-05
1983	1983-06-13	1983-10-02
1984	1984-06-01	1984-09-25
1985	1985-04-18	1985-09-19
1986	1986-04-25	1986-09-28
1987	1987-04-19	1987-09-26
1988	1988-05-11	1988-10-17
1989	1989-04-21	1989-10-14
1990	1990-05-25	1990-10-05
1991	1991-03-26	1991-10-23
1992	1992-05-12	1992-09-17
1993	1993-05-28	1993-09-22
1994	1994-04-18	1994-10-02
1995	1995-03-22	1995-10-17
1996	1996-04-11	1996-09-11
1997	1997-05-17	1997-10-06
1998	1998-04-25	1998-09-30
1999	1999-06-03	1999-10-15
2001	2001-04-27	2001-09-12
2002	2002-04-14	2002-10-02
2003	2003-05-10	2003-10-21
2004	2004-05-06	2004-09-21
2006	2006-04-13	2006-10-03
2007	2007-05-12	2007-10-05
2008	2008-05-25	2008-09-02
2009	2009-05-30	2009-09-28
2010	2010-05-23	2010-10-09
2011	2011-04-04	2011-10-05
2012	2012-04-02	2012-09-13
2013	2013-05-15	2013-10-05
2014	2014-05-05	2014-09-21
2015	2015-04-08	2015-10-12
2016	2016-06-07	2016-10-18
2017	2017-03-20	2017-10-15
2018	2018-05-07	2018-10-04
2019	2019-05-17	2019-10-03
2020	2020-04-09	2020-10-12
2021	2021-06-05	2021-10-10
2022	2022-05-10	2022-09-25
2023	2023-05-07	2023-10-03
2024	2024-04-15	2024-10-25
2025	2025-05-15	2025-10-13
2026	2026-03-21	2026-10-14

Every Fixed Threshold

Fixed thresholds at Ottawa
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	128	124	1953	94
35 C (95 F): Days	125	80	1936	23
40 C (104 F): Days	39	39	1936	1
45 C (113 F): Days	2	4	1954	4
90 F (32.2 C): Days	128	98	1953	49
100 F (37.8 C): Days	85	57	1936	5
110 F (43.3 C): Days	9	12	1936	1
0 C (32 F): Ice days (max	128	50	1978	11
0 C (32 F): Frost days (min	126	142	2013	61
-10 C (14 F): Days with min	126	50	1978	16
-20 C (-4 F): Days with min	81	13	1905	2
-30 C (-22 F): Days with min	4	1	1899	1
20 C (68 F): Tropical nights (min	126	72	1937	58
25 C (77 F): Days with min	81	22	1936	4
10 mm (0.39 in): Days with 10 mm or more rain	128	45	1915	37
25 mm (0.98 in): Days with 25 mm or more rain	128	20	1898	17
50 mm (1.97 in): Days with 50 mm or more rain	111	8	1905	4
100 mm (3.94 in): Days with 100 mm or more rain	26	2	1915	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	2019	1
10 cm (3.9 in): Days with 10 cm or more snowfall	85	6	1960	1
25 cm (9.8 in): Days with 25 cm or more snowfall	12	2	1912	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1896.

Download the Data

Data for Ottawa 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).

Ottawa Threshold Days by Year (USC00146128)

Key Facts for Ottawa Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related