Ottawa Threshold Days by Year (CA006105887)

17 fixed thresholds counted per year at Ottawa (CA006105887): 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 below 0 C (32 F) in 48 years, most in 1885 with 114.
Ottawa: nights with a minimum temperature at or below 0 C (32 F) in 48 years, most in 1875 with 190.
Ottawa: nights with a minimum temperature at or below -10 C (14 F) in 48 years, most in 1883 with 114.
Ottawa: nights with a minimum temperature at or below -20 C (-4 F) in 48 years, most in 1885 with 47.
17 fixed thresholds have at least one qualifying day at Ottawa.

Days at or above 30 C (86 F)

47 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 41 in 1876.

Days at or above 30 C (86 F) per year at Ottawa
Year	Days	Decade average
1873	20	25
1874	25	25
1875	20	25
1876	41	25
1879	19	25
1880	23	15.3
1884	28	15.3
1885	3	15.3
1886	3	15.3
1887	26	15.3
1888	12	15.3
1889	12	15.3
1900	12	11.2
1901	23	11.2
1902	3	11.2
1903	6	11.2
1904	4	11.2
1905	4	11.2
1906	24	11.2
1907	11	11.2
1908	21	11.2
1909	4	11.2
1910	3	13.5
1911	20	13.5
1912	8	13.5
1913	15	13.5
1914	6	13.5
1915	5	13.5
1916	22	13.5
1917	10	13.5
1918	20	13.5
1919	26	13.5
1920	16	17.4
1921	36	17.4
1922	22	17.4
1923	17	17.4
1924	17	17.4
1925	16	17.4
1926	6	17.4
1927	4	17.4
1928	13	17.4
1929	27	17.4
1930	16	23.8
1931	38	23.8
1932	18	23.8
1933	22	23.8
1934	25	23.8

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
1873	1873-06-10	1873-09-12
1874	1874-05-28	1874-09-14
1875	1875-06-11	1875-09-09
1876	1876-06-01	1876-09-01
1879	1879-05-30	1879-07-31
1880	1880-05-09	1880-09-05
1884	1884-06-06	1884-09-10
1885	1885-07-17	1885-07-30
1886	1886-07-04	1886-08-10
1887	1887-05-09	1887-08-04
1888	1888-06-09	1888-08-07
1889	1889-05-08	1889-09-04
1900	1900-06-21	1900-09-03
1901	1901-06-14	1901-09-07
1902	1902-07-08	1902-07-31
1903	1903-05-17	1903-07-10
1904	1904-06-21	1904-07-19
1905	1905-07-03	1905-08-11
1906	1906-05-18	1906-09-12
1907	1907-06-14	1907-08-12
1908	1908-06-07	1908-09-10
1909	1909-06-22	1909-08-25
1910	1910-06-22	1910-07-09
1911	1911-05-20	1911-08-26
1912	1912-07-03	1912-07-15
1913	1913-05-02	1913-08-17
1914	1914-05-26	1914-09-22
1915	1915-04-26	1915-09-15
1916	1916-07-07	1916-08-22
1917	1917-07-22	1917-08-13
1918	1918-05-18	1918-08-23
1919	1919-05-29	1919-08-21
1920	1920-06-01	1920-09-26
1921	1921-05-20	1921-09-12
1922	1922-05-25	1922-10-01
1923	1923-05-25	1923-08-31
1924	1924-06-21	1924-08-31
1925	1925-06-05	1925-08-30
1926	1926-07-20	1926-08-06
1927	1927-06-29	1927-07-13
1928	1928-07-02	1928-08-28
1929	1929-05-28	1929-09-10
1930	1930-05-06	1930-09-02
1931	1931-05-28	1931-09-14
1932	1932-05-16	1932-09-01
1933	1933-06-09	1933-09-26
1934	1934-05-04	1934-09-26

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	47	41	1876	25
35 C (95 F): Days	16	9	1931	2
90 F (32.2 C): Days	38	25	1876	7
100 F (37.8 C): Days	1	3	1931	3
0 C (32 F): Ice days (max	48	114	1885	87
0 C (32 F): Frost days (min	48	190	1875	160
-10 C (14 F): Days with min	48	114	1883	85
-20 C (-4 F): Days with min	48	47	1885	38
-30 C (-22 F): Days with min	32	15	1884	5
20 C (68 F): Tropical nights (min	45	12	1916	2
25 C (77 F): Days with min	2	1	1901	1
10 mm (0.39 in): Days with 10 mm or more rain	45	40	1909	30
25 mm (0.98 in): Days with 25 mm or more rain	44	10	1887	6
50 mm (1.97 in): Days with 50 mm or more rain	13	2	1886	1
10 cm (3.9 in): Days with 10 cm or more snowfall	48	17	1887	6
25 cm (9.8 in): Days with 25 cm or more snowfall	21	7	1887	2
50 cm (19.7 in): Days with 50 cm or more snowfall	2	1	1876	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1873.

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 (CA006105887)

Key Facts for Ottawa Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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