Slave Lake Threshold Days by Year (CA003066000)

15 fixed thresholds counted per year at Slave Lake (CA003066000): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Slave Lake Thresholds

Slave Lake: nights with a minimum temperature at or below 0 C (32 F) in 33 years, most in 1925 with 233.
Slave Lake: nights with a minimum temperature at or below -10 C (14 F) in 33 years, most in 1951 with 144.
Slave Lake: nights with a minimum temperature at or below -20 C (-4 F) in 33 years, most in 1955 with 87.
Slave Lake: nights with a minimum temperature at or below -30 C (-22 F) in 33 years, most in 1936 with 39.
15 fixed thresholds have at least one qualifying day at Slave Lake.

Days at or above 30 C (86 F)

27 years with a qualifying day

Days per year at Slave Lake with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 8 in 1961.

Days at or above 30 C (86 F) per year at Slave Lake
Year	Days	Decade average
1925	1	2.5
1929	4	2.5
1930	1	2.4
1931	2	2.4
1932	1	2.4
1933	1	2.4
1934	1	2.4
1935	1	2.4
1936	5	2.4
1937	4	2.4
1938	3	2.4
1939	5	2.4
1940	3	2.7
1941	6	2.7
1942	4	2.7
1943	1	2.7
1944	2	2.7
1946	1	2.7
1949	2	2.7
1950	3	2
1953	3	2
1954	1	2
1955	1	2
1956	2	2
1959	2	2
1960	2	5
1961	8	5

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

First to last qualifying date each year at Slave Lake
Year	First date	Last date
1925	1925-08-01	1925-08-01
1929	1929-07-14	1929-08-17
1930	1930-07-31	1930-07-31
1931	1931-07-09	1931-07-20
1932	1932-08-25	1932-08-25
1933	1933-07-25	1933-07-25
1934	1934-05-25	1934-05-25
1935	1935-07-23	1935-07-23
1936	1936-05-26	1936-06-22
1937	1937-06-15	1937-07-28
1938	1938-07-21	1938-09-15
1939	1939-07-11	1939-08-22
1940	1940-05-23	1940-08-30
1941	1941-06-12	1941-07-19
1942	1942-07-02	1942-08-16
1943	1943-09-24	1943-09-24
1944	1944-06-10	1944-08-31
1946	1946-08-21	1946-08-21
1949	1949-07-15	1949-08-01
1950	1950-06-13	1950-07-25
1953	1953-07-09	1953-08-19
1954	1954-07-07	1954-07-07
1955	1955-07-18	1955-07-18
1956	1956-07-09	1956-07-20
1959	1959-07-12	1959-07-23
1960	1960-07-17	1960-08-10
1961	1961-05-26	1961-08-14

Every Fixed Threshold

Fixed thresholds at Slave Lake
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	27	8	1961	8
90 F (32.2 C): Days	9	5	1941	3
0 C (32 F): Ice days (max	32	142	1951	87
0 C (32 F): Frost days (min	33	233	1925	204
-10 C (14 F): Days with min	33	144	1951	100
-20 C (-4 F): Days with min	33	87	1955	42
-30 C (-22 F): Days with min	33	39	1936	12
-40 C (-40 F): Days with min	24	11	1954	2
20 C (68 F): Tropical nights (min	2	1	1932	1
25 C (77 F): Days with min	1	1	1932	1
10 mm (0.39 in): Days with 10 mm or more rain	33	37	1935	12
25 mm (0.98 in): Days with 25 mm or more rain	25	8	1935	3
50 mm (1.97 in): Days with 50 mm or more rain	3	1	1938	1
10 cm (3.9 in): Days with 10 cm or more snowfall	30	12	1935	2
25 cm (9.8 in): Days with 25 cm or more snowfall	4	3	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 1925.

Download the Data

Data for Slave Lake 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).

Slave Lake Threshold Days by Year (CA003066000)

Key Facts for Slave Lake Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related