Sudbury A Threshold Days by Year (CA006068150)

16 fixed thresholds counted per year at Sudbury A (CA006068150): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Sudbury A Thresholds

Sudbury A: days with a maximum temperature at or below 0 C (32 F) in 29 years, most in 1959 with 125.
Sudbury A: nights with a minimum temperature at or below 0 C (32 F) in 29 years, most in 1972 with 204.
Sudbury A: nights with a minimum temperature at or below -10 C (14 F) in 29 years, most in 1970 with 112.
Sudbury A: nights with a minimum temperature at or below -20 C (-4 F) in 29 years, most in 1963 with 57.
16 fixed thresholds have at least one qualifying day at Sudbury A.

Days at or above 30 C (86 F)

25 years with a qualifying day

Days per year at Sudbury A with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 18 in 1955.

Days at or above 30 C (86 F) per year at Sudbury A
Year	Days	Decade average
1955	18	8
1956	4	8
1957	3	8
1959	7	8
1960	1	6.4
1961	2	6.4
1962	4	6.4
1963	12	6.4
1964	11	6.4
1966	11	6.4
1968	3	6.4
1969	7	6.4
1970	5	7
1971	4	7
1973	8	7
1974	4	7
1975	15	7
1976	7	7
1977	11	7
1978	5	7
1979	4	7
1980	3	5.3
1981	5	5.3
1982	1	5.3
1983	12	5.3

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

First to last qualifying date each year at Sudbury A
Year	First date	Last date
1955	1955-06-06	1955-08-20
1956	1956-06-11	1956-06-14
1957	1957-06-17	1957-08-02
1959	1959-06-09	1959-09-09
1960	1960-09-07	1960-09-07
1961	1961-06-29	1961-08-31
1962	1962-05-16	1962-07-07
1963	1963-06-25	1963-07-27
1964	1964-05-22	1964-07-28
1966	1966-06-23	1966-07-12
1968	1968-07-15	1968-07-17
1969	1969-05-28	1969-08-30
1970	1970-08-09	1970-08-14
1971	1971-06-28	1971-08-07
1973	1973-07-07	1973-09-04
1974	1974-07-08	1974-08-21
1975	1975-05-23	1975-08-02
1976	1976-06-06	1976-08-22
1977	1977-05-17	1977-07-20
1978	1978-05-27	1978-08-14
1979	1979-07-12	1979-07-24
1980	1980-05-23	1980-07-15
1981	1981-07-06	1981-07-11
1982	1982-07-25	1982-07-25
1983	1983-06-12	1983-07-27

Every Fixed Threshold

Fixed thresholds at Sudbury A
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	25	18	1955	12
35 C (95 F): Days	4	2	1955	1
90 F (32.2 C): Days	11	6	1966	1
100 F (37.8 C): Days	1	1	1975	1
0 C (32 F): Ice days (max	29	125	1959	98
0 C (32 F): Frost days (min	29	204	1972	188
-10 C (14 F): Days with min	29	112	1970	89
-20 C (-4 F): Days with min	29	57	1963	35
-30 C (-22 F): Days with min	27	9	1976	2
20 C (68 F): Tropical nights (min	7	4	1955	1
10 mm (0.39 in): Days with 10 mm or more rain	29	34	1959	28
25 mm (0.98 in): Days with 25 mm or more rain	29	8	1960	6
50 mm (1.97 in): Days with 50 mm or more rain	9	2	1961	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1970	1
10 cm (3.9 in): Days with 10 cm or more snowfall	29	12	1972	7
25 cm (9.8 in): Days with 25 cm or more snowfall	10	2	1978	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1955.

Download the Data

Data for Sudbury A 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).

Sudbury A Threshold Days by Year (CA006068150)

Key Facts for Sudbury A Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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