Coppermine Threshold Days by Year (CA002300900)

13 fixed thresholds counted per year at Coppermine (CA002300900): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Coppermine Thresholds

Coppermine: nights with a minimum temperature at or below 0 C (32 F) in 45 years, most in 1965 with 295.
Coppermine: nights with a minimum temperature at or below -10 C (14 F) in 45 years, most in 1936 with 228.
Coppermine: nights with a minimum temperature at or below -20 C (-4 F) in 45 years, most in 1936 with 190.
Coppermine: nights with a minimum temperature at or below -30 C (-22 F) in 45 years, most in 1961 with 121.
13 fixed thresholds have at least one qualifying day at Coppermine.

Nights at or below 0 C (32 F)

45 years with a qualifying day

Days per year at Coppermine with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 295 in 1965.

Nights at or below 0 C (32 F) per year at Coppermine
Year	Days	Decade average
1933	280	277.1
1934	289	277.1
1935	266	277.1
1936	286	277.1
1937	272	277.1
1938	260	277.1
1939	287	277.1
1940	277	279.7
1941	280	279.7
1942	283	279.7
1943	265	279.7
1944	271	279.7
1945	285	279.7
1946	278	279.7
1947	294	279.7
1948	284	279.7
1949	280	279.7
1950	281	277.4
1951	275	277.4
1952	275	277.4
1953	264	277.4
1954	280	277.4
1955	270	277.4
1956	287	277.4
1957	288	277.4
1958	271	277.4
1959	283	277.4
1960	267	275.2
1961	275	275.2
1962	270	275.2
1963	270	275.2
1964	283	275.2
1965	295	275.2
1966	256	275.2
1967	292	275.2
1968	274	275.2
1969	270	275.2
1970	269	266.9
1971	264	266.9
1972	293	266.9
1973	253	266.9
1974	292	266.9
1975	264	266.9
1976	272	266.9
1977	228	266.9

For each year, a bar from the first to the last day at Coppermine meeting 0 C (32 F).

First to last qualifying date each year at Coppermine
Year	First date	Last date
1933	1933-01-01	1933-12-31
1934	1934-01-01	1934-12-31
1935	1935-01-01	1935-12-31
1936	1936-01-01	1936-12-31
1937	1937-01-01	1937-12-31
1938	1938-01-01	1938-12-31
1939	1939-01-01	1939-12-31
1940	1940-01-01	1940-12-31
1941	1941-01-01	1941-12-31
1942	1942-01-01	1942-12-31
1943	1943-01-01	1943-12-31
1944	1944-01-01	1944-12-31
1945	1945-01-01	1945-12-31
1946	1946-01-01	1946-12-31
1947	1947-01-01	1947-12-31
1948	1948-01-01	1948-12-31
1949	1949-01-01	1949-12-31
1950	1950-01-01	1950-12-31
1951	1951-01-01	1951-12-31
1952	1952-01-01	1952-12-31
1953	1953-01-01	1953-12-31
1954	1954-01-01	1954-12-31
1955	1955-01-01	1955-12-31
1956	1956-01-01	1956-12-31
1957	1957-01-01	1957-12-31
1958	1958-01-01	1958-12-31
1959	1959-01-01	1959-12-31
1960	1960-01-01	1960-12-31
1961	1961-01-01	1961-12-31
1962	1962-01-01	1962-12-31
1963	1963-01-01	1963-12-31
1964	1964-01-01	1964-12-31
1965	1965-01-01	1965-12-31
1966	1966-01-01	1966-12-31
1967	1967-01-01	1967-12-31
1968	1968-01-01	1968-12-31
1969	1969-01-01	1969-12-31
1970	1970-01-01	1970-12-31
1971	1971-01-01	1971-12-31
1972	1972-01-01	1972-12-31
1973	1973-01-01	1973-12-31
1974	1974-01-01	1974-12-31
1975	1975-01-01	1975-12-31
1976	1976-01-01	1976-12-31
1977	1977-01-01	1977-11-30

Every Fixed Threshold

Fixed thresholds at Coppermine
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	2	2	1964	2
90 F (32.2 C): Days	1	1	1964	1
0 C (32 F): Ice days (max	42	249	1936	178
0 C (32 F): Frost days (min	45	295	1965	228
-10 C (14 F): Days with min	45	228	1936	166
-20 C (-4 F): Days with min	45	190	1936	126
-30 C (-22 F): Days with min	45	121	1961	71
-40 C (-40 F): Days with min	45	35	1961	6
10 mm (0.39 in): Days with 10 mm or more rain	40	9	1976	2
25 mm (0.98 in): Days with 25 mm or more rain	8	2	1937	1
50 mm (1.97 in): Days with 50 mm or more rain	1	1	1973	1
10 cm (3.9 in): Days with 10 cm or more snowfall	20	5	1976	2
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1937	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1936.

Download the Data

Data for Coppermine 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).

Coppermine Threshold Days by Year (CA002300900)

Key Facts for Coppermine Thresholds

Nights at or below 0 C (32 F)

Every Fixed Threshold

Download the Data

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