Ottawa Cda Threshold Days by Year (CA006105976)

16 fixed thresholds counted per year at Ottawa Cda (CA006105976): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ottawa Cda Thresholds

Ottawa Cda: days with a maximum temperature at or above 30 C (86 F) in 94 years, most in 1955 with 42.
Ottawa Cda: days with a maximum temperature at or below 0 C (32 F) in 94 years, most in 1904 with 110.
Ottawa Cda: nights with a minimum temperature at or below 0 C (32 F) in 94 years, most in 1907 with 195.
Ottawa Cda: nights with a minimum temperature at or below -10 C (14 F) in 94 years, most in 1904 with 107.
16 fixed thresholds have at least one qualifying day at Ottawa Cda.

Days at or above 30 C (86 F)

94 years with a qualifying day

Days per year at Ottawa Cda with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 42 in 1955.

Days at or above 30 C (86 F) per year at Ottawa Cda
Year	Days	Decade average
1890	12	16.6
1891	14	16.6
1892	16	16.6
1893	18	16.6
1894	16	16.6
1895	21	16.6
1896	18	16.6
1897	14	16.6
1898	19	16.6
1899	18	16.6
1900	17	18.2
1901	27	18.2
1902	9	18.2
1903	9	18.2
1904	10	18.2
1905	8	18.2
1906	34	18.2
1907	18	18.2
1908	30	18.2
1909	20	18.2
1910	16	22.7
1911	34	22.7
1912	14	22.7
1913	31	22.7
1914	26	22.7
1915	20	22.7
1916	28	22.7
1917	12	22.7
1918	17	22.7
1919	29	22.7
1920	14	13.5
1921	38	13.5
1922	20	13.5
1923	15	13.5
1924	8	13.5
1925	15	13.5
1926	3	13.5
1927	3	13.5
1928	6	13.5
1929	13	13.5
1930	10	15.5
1931	24	15.5
1932	8	15.5
1933	17	15.5
1934	17	15.5
1935	14	15.5
1936	11	15.5
1937	23	15.5
1938	15	15.5
1939	16	15.5
1940	13	18.6
1941	25	18.6
1942	11	18.6
1943	10	18.6
1944	27	18.6
1945	14	18.6
1946	17	18.6
1947	27	18.6
1948	9	18.6
1949	33	18.6
1950	9	14.2
1951	4	14.2
1952	16	14.2
1953	19	14.2
1954	3	14.2
1955	42	14.2
1956	4	14.2
1957	11	14.2
1958	6	14.2
1959	28	14.2
1960	11	10.9
1961	8	10.9
1962	9	10.9
1963	19	10.9
1964	12	10.9
1965	9	10.9
1966	16	10.9
1967	7	10.9
1968	7	10.9
1969	11	10.9
1970	20	13.5
1971	8	13.5
1972	3	13.5
1973	17	13.5
1974	9	13.5
1975	26	13.5
1976	12	13.5
1977	12	13.5
1978	15	13.5
1979	13	13.5
1980	5	11
1981	6	11
1982	6	11
1983	27	11

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

First to last qualifying date each year at Ottawa Cda
Year	First date	Last date
1890	1890-06-23	1890-08-08
1891	1891-06-01	1891-09-25
1892	1892-06-01	1892-08-18
1893	1893-05-12	1893-08-12
1894	1894-06-10	1894-08-24
1895	1895-05-10	1895-09-23
1896	1896-05-09	1896-09-11
1897	1897-07-03	1897-09-10
1898	1898-06-01	1898-09-04
1899	1899-06-05	1899-08-31
1900	1900-05-14	1900-09-03
1901	1901-06-14	1901-09-07
1902	1902-05-23	1902-08-31
1903	1903-05-17	1903-09-13
1904	1904-06-20	1904-07-27
1905	1905-06-15	1905-08-10
1906	1906-05-18	1906-09-13
1907	1907-05-15	1907-08-16
1908	1908-05-26	1908-09-26
1909	1909-06-04	1909-08-25
1910	1910-06-14	1910-08-09
1911	1911-05-11	1911-08-27
1912	1912-06-24	1912-07-15
1913	1913-04-25	1913-09-02
1914	1914-05-19	1914-09-22
1915	1915-04-25	1915-09-15
1916	1916-07-06	1916-08-22
1917	1917-07-06	1917-08-13
1918	1918-05-19	1918-08-23
1919	1919-06-02	1919-08-21
1920	1920-05-27	1920-09-26
1921	1921-05-20	1921-09-03
1922	1922-06-05	1922-09-11
1923	1923-06-01	1923-08-07
1924	1924-06-21	1924-09-01
1925	1925-06-05	1925-08-31
1926	1926-07-20	1926-07-22
1927	1927-05-22	1927-06-30
1928	1928-07-08	1928-08-28
1929	1929-05-28	1929-09-03
1930	1930-05-06	1930-09-02
1931	1931-06-19	1931-09-14
1932	1932-05-16	1932-08-26
1933	1933-06-09	1933-08-16
1934	1934-06-04	1934-09-03
1935	1935-07-04	1935-08-20
1936	1936-05-08	1936-08-19
1937	1937-05-30	1937-09-03
1938	1938-06-16	1938-08-20
1939	1939-05-08	1939-09-16
1940	1940-06-04	1940-08-18
1941	1941-05-21	1941-09-22
1942	1942-06-11	1942-09-18
1943	1943-06-04	1943-08-02
1944	1944-05-30	1944-08-16
1945	1945-06-24	1945-09-08
1946	1946-06-25	1946-09-20
1947	1947-06-11	1947-09-11
1948	1948-07-10	1948-08-28
1949	1949-06-03	1949-08-27
1950	1950-06-08	1950-07-13
1951	1951-07-25	1951-09-13
1952	1952-06-17	1952-09-11
1953	1953-05-10	1953-09-04
1954	1954-07-29	1954-08-25
1955	1955-06-04	1955-09-19
1956	1956-06-12	1956-06-16
1957	1957-06-15	1957-08-09
1958	1958-07-01	1958-08-07
1959	1959-06-05	1959-09-10
1960	1960-07-10	1960-09-08
1961	1961-07-23	1961-09-14
1962	1962-05-17	1962-08-31
1963	1963-06-04	1963-08-21
1964	1964-05-23	1964-07-28
1965	1965-05-26	1965-09-22
1966	1966-06-23	1966-08-09
1967	1967-06-03	1967-08-17
1968	1968-07-01	1968-07-22
1969	1969-06-12	1969-08-31
1970	1970-06-02	1970-08-16
1971	1971-05-19	1971-08-19
1972	1972-07-12	1972-07-21
1973	1973-06-26	1973-09-05
1974	1974-06-10	1974-08-23
1975	1975-05-20	1975-08-16
1976	1976-04-18	1976-08-22
1977	1977-05-17	1977-09-01
1978	1978-05-26	1978-08-15
1979	1979-05-09	1979-07-25
1980	1980-06-24	1980-08-25
1981	1981-06-16	1981-08-04
1982	1982-07-07	1982-07-22
1983	1983-06-12	1983-09-20

Every Fixed Threshold

Fixed thresholds at Ottawa Cda
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	94	42	1955	27
35 C (95 F): Days	34	10	1916	1
90 F (32.2 C): Days	80	21	1911	9
100 F (37.8 C): Days	5	1	1913	1
0 C (32 F): Ice days (max	94	110	1904	72
0 C (32 F): Frost days (min	94	195	1907	161
-10 C (14 F): Days with min	94	107	1904	64
-20 C (-4 F): Days with min	94	56	1934	15
-30 C (-22 F): Days with min	77	21	1934	2
20 C (68 F): Tropical nights (min	86	19	1973	7
10 mm (0.39 in): Days with 10 mm or more rain	94	47	1893	32
25 mm (0.98 in): Days with 25 mm or more rain	94	10	1943	5
50 mm (1.97 in): Days with 50 mm or more rain	29	2	1902	1
10 cm (3.9 in): Days with 10 cm or more snowfall	93	16	1908	4
25 cm (9.8 in): Days with 25 cm or more snowfall	33	3	1912	1
50 cm (19.7 in): Days with 50 cm or more snowfall	2	1	1894	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1890.

Download the Data

Data for Ottawa Cda 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 Cda Threshold Days by Year (CA006105976)

Key Facts for Ottawa Cda Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related