Lake Cowichan Threshold Days by Year (CA001014493)

14 fixed thresholds counted per year at Lake Cowichan (CA001014493): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Lake Cowichan Thresholds

Lake Cowichan: nights with a minimum temperature at or below 0 C (32 F) in 17 years, most in 1938 with 101.
Lake Cowichan: days with 10 mm (0.39 in) or more of precipitation in 17 years, most in 1931 with 76.
Lake Cowichan: days with 25 mm (0.98 in) or more of precipitation in 17 years, most in 1933 with 27.
Lake Cowichan: days with a maximum temperature at or above 30 C (86 F) in 16 years, most in 1938 with 23.
14 fixed thresholds have at least one qualifying day at Lake Cowichan.

Days at or above 30 C (86 F)

16 years with a qualifying day

Days per year at Lake Cowichan with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 23 in 1938.

Days at or above 30 C (86 F) per year at Lake Cowichan
Year	Days	Decade average
1924	8	10.2
1925	7	10.2
1926	9	10.2
1927	17	10.2
1928	10	10.2
1930	3	9.2
1931	3	9.2
1932	2	9.2
1933	3	9.2
1934	5	9.2
1935	15	9.2
1936	9	9.2
1937	11	9.2
1938	23	9.2
1939	18	9.2
1940	8	8

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

First to last qualifying date each year at Lake Cowichan
Year	First date	Last date
1924	1924-05-12	1924-09-04
1925	1925-06-24	1925-08-19
1926	1926-06-24	1926-08-06
1927	1927-07-16	1927-08-18
1928	1928-07-21	1928-09-02
1930	1930-08-10	1930-08-14
1931	1931-07-07	1931-07-19
1932	1932-06-11	1932-06-12
1933	1933-07-15	1933-08-15
1934	1934-08-23	1934-09-02
1935	1935-07-12	1935-09-08
1936	1936-05-26	1936-08-28
1937	1937-06-01	1937-09-14
1938	1938-06-06	1938-09-15
1939	1939-05-14	1939-08-22
1940	1940-06-24	1940-09-09

Every Fixed Threshold

Fixed thresholds at Lake Cowichan
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	16	23	1938	8
35 C (95 F): Days	2	3	1938	2
90 F (32.2 C): Days	14	13	1938	2
0 C (32 F): Ice days (max	15	17	1930	1
0 C (32 F): Frost days (min	17	101	1938	77
-10 C (14 F): Days with min	10	14	1930	9
20 C (68 F): Tropical nights (min	1	1	1935	1
10 mm (0.39 in): Days with 10 mm or more rain	17	76	1931	53
25 mm (0.98 in): Days with 25 mm or more rain	17	27	1933	15
50 mm (1.97 in): Days with 50 mm or more rain	15	7	1934	3
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1934	1
10 cm (3.9 in): Days with 10 cm or more snowfall	14	7	1933	2
25 cm (9.8 in): Days with 25 cm or more snowfall	6	2	1926	2
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1935	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1924.

Download the Data

Data for Lake Cowichan 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).

Lake Cowichan Threshold Days by Year (CA001014493)

Key Facts for Lake Cowichan Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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