Valleyfield Threshold Days by Year (CA007028680)

15 fixed thresholds counted per year at Valleyfield (CA007028680): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Valleyfield Thresholds

Valleyfield: days with a maximum temperature at or below 0 C (32 F) in 30 years, most in 1955 with 96.
Valleyfield: nights with a minimum temperature at or below 0 C (32 F) in 30 years, most in 1956 with 172.
Valleyfield: nights with a minimum temperature at or below -10 C (14 F) in 30 years, most in 1978 with 85.
Valleyfield: nights with a minimum temperature at or below -20 C (-4 F) in 30 years, most in 1976 with 28.
15 fixed thresholds have at least one qualifying day at Valleyfield.

Days at or above 30 C (86 F)

29 years with a qualifying day

Days per year at Valleyfield with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 40 in 1955.

Days at or above 30 C (86 F) per year at Valleyfield
Year	Days	Decade average
1952	20	16.4
1953	20	16.4
1954	2	16.4
1955	40	16.4
1956	7	16.4
1957	12	16.4
1958	7	16.4
1959	23	16.4
1960	12	9.9
1961	13	9.9
1962	5	9.9
1964	13	9.9
1966	13	9.9
1967	3	9.9
1969	10	9.9
1970	25	14.7
1971	16	14.7
1972	5	14.7
1973	27	14.7
1974	4	14.7
1975	22	14.7
1976	10	14.7
1977	10	14.7
1978	14	14.7
1979	14	14.7
1980	6	11
1981	9	11
1982	8	11
1983	21	11

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

First to last qualifying date each year at Valleyfield
Year	First date	Last date
1952	1952-06-14	1952-08-29
1953	1953-05-08	1953-09-04
1954	1954-07-13	1954-08-25
1955	1955-06-06	1955-09-19
1956	1956-06-12	1956-08-09
1957	1957-06-15	1957-08-04
1958	1958-07-01	1958-09-01
1959	1959-05-29	1959-09-10
1960	1960-06-28	1960-09-09
1961	1961-05-15	1961-09-11
1962	1962-05-17	1962-08-31
1964	1964-05-23	1964-07-28
1966	1966-05-24	1966-08-09
1967	1967-06-03	1967-06-05
1969	1969-06-12	1969-08-31
1970	1970-06-02	1970-08-20
1971	1971-05-19	1971-08-19
1972	1972-06-15	1972-09-01
1973	1973-06-06	1973-09-05
1974	1974-06-10	1974-08-22
1975	1975-05-20	1975-08-26
1976	1976-04-18	1976-08-22
1977	1977-05-21	1977-09-01
1978	1978-05-27	1978-08-16
1979	1979-05-09	1979-08-04
1980	1980-06-24	1980-08-24
1981	1981-06-16	1981-08-01
1982	1982-05-07	1982-07-16
1983	1983-06-12	1983-09-20

Every Fixed Threshold

Fixed thresholds at Valleyfield
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	29	40	1955	21
35 C (95 F): Days	3	4	1955	2
90 F (32.2 C): Days	23	16	1955	3
0 C (32 F): Ice days (max	30	96	1955	71
0 C (32 F): Frost days (min	30	172	1956	158
-10 C (14 F): Days with min	30	85	1978	56
-20 C (-4 F): Days with min	30	28	1976	11
-30 C (-22 F): Days with min	12	4	1976	2
20 C (68 F): Tropical nights (min	30	23	1973	13
25 C (77 F): Days with min	1	1	1975	1
10 mm (0.39 in): Days with 10 mm or more rain	25	44	1954	33
25 mm (0.98 in): Days with 25 mm or more rain	24	11	1954	6
50 mm (1.97 in): Days with 50 mm or more rain	6	2	1975	1
10 cm (3.9 in): Days with 10 cm or more snowfall	27	14	1958	3
25 cm (9.8 in): Days with 25 cm or more snowfall	11	3	1954	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1952.

Download the Data

Data for Valleyfield 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).

Valleyfield Threshold Days by Year (CA007028680)

Key Facts for Valleyfield Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related