Alert Threshold Days by Year (CA002400300)

10 fixed thresholds counted per year at Alert (CA002400300): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Alert Thresholds

Alert: days with a maximum temperature at or below 0 C (32 F) in 33 years, most in 1975 with 305.
Alert: nights with a minimum temperature at or below 0 C (32 F) in 33 years, most in 1955 with 353.
Alert: nights with a minimum temperature at or below -10 C (14 F) in 33 years, most in 1963 with 271.
Alert: nights with a minimum temperature at or below -20 C (-4 F) in 33 years, most in 1956 with 228.
10 fixed thresholds have at least one qualifying day at Alert.

Nights at or below 0 C (32 F)

33 years with a qualifying day

Days per year at Alert with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 353 in 1955.

Nights at or below 0 C (32 F) per year at Alert
Year	Days	Decade average
1951	343	335.7
1952	344	335.7
1953	341	335.7
1954	330	335.7
1955	353	335.7
1956	324	335.7
1957	323	335.7
1958	322	335.7
1959	341	335.7
1960	333	338.6
1961	343	338.6
1962	329	338.6
1963	343	338.6
1964	346	338.6
1965	348	338.6
1966	326	338.6
1967	333	338.6
1968	347	338.6
1969	338	338.6
1970	340	339.3
1971	331	339.3
1972	346	339.3
1973	346	339.3
1974	339	339.3
1975	341	339.3
1976	346	339.3
1977	341	339.3
1978	326	339.3
1979	337	339.3
1980	338	337
1981	333	337
1982	337	337
1983	340	337

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

First to last qualifying date each year at Alert
Year	First date	Last date
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	1977-12-31
1978	1978-01-01	1978-12-31
1979	1979-01-01	1979-12-31
1980	1980-01-01	1980-12-31
1981	1981-01-01	1981-12-31
1982	1982-01-01	1982-12-31
1983	1983-01-01	1983-12-31

Every Fixed Threshold

Fixed thresholds at Alert
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
0 C (32 F): Ice days (max	33	305	1975	265
0 C (32 F): Frost days (min	33	353	1955	340
-10 C (14 F): Days with min	33	271	1963	248
-20 C (-4 F): Days with min	33	228	1956	221
-30 C (-22 F): Days with min	33	169	1966	130
-40 C (-40 F): Days with min	33	49	1954	10
10 mm (0.39 in): Days with 10 mm or more rain	22	4	1968	4
25 mm (0.98 in): Days with 25 mm or more rain	1	1	1980	1
10 cm (3.9 in): Days with 10 cm or more snowfall	23	4	1983	4
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1980	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1951.

Download the Data

Data for Alert 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).

Alert Threshold Days by Year (CA002400300)

Key Facts for Alert Thresholds

Nights at or below 0 C (32 F)

Every Fixed Threshold

Download the Data

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