Sudbury Threshold Days by Year (CA006068148)

16 fixed thresholds counted per year at Sudbury (CA006068148): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Sudbury Thresholds

Sudbury: days with 10 mm (0.39 in) or more of precipitation in 27 years, most in 1970 with 31.
Sudbury: days with 25 mm (0.98 in) or more of precipitation in 26 years, most in 1970 with 8.
Sudbury: days with a maximum temperature at or below 0 C (32 F) in 25 years, most in 1926 with 115.
Sudbury: days with 10 cm (3.9 in) or more of snowfall in 25 years, most in 1929 with 9.
16 fixed thresholds have at least one qualifying day at Sudbury.

Days at or above 30 C (86 F)

23 years with a qualifying day

Days per year at Sudbury with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 24 in 1919.

Days at or above 30 C (86 F) per year at Sudbury
Year	Days	Decade average
1888	8	5.5
1889	3	5.5
1919	24	24
1920	2	7.7
1921	23	7.7
1922	5	7.7
1923	7	7.7
1925	7	7.7
1926	2	7.7
1929	8	7.7
1948	9	11.5
1949	14	11.5
1950	3	5.8
1952	7	5.8
1953	14	5.8
1954	2	5.8
1955	3	5.8
1969	8	8
1970	4	7
1971	4	7
1973	9	7
1974	4	7
1975	14	7

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

First to last qualifying date each year at Sudbury
Year	First date	Last date
1888	1888-06-09	1888-09-24
1889	1889-05-18	1889-07-09
1919	1919-05-28	1919-08-06
1920	1920-06-14	1920-08-07
1921	1921-06-21	1921-09-02
1922	1922-06-07	1922-08-16
1923	1923-06-20	1923-07-31
1925	1925-06-05	1925-08-25
1926	1926-07-30	1926-08-03
1929	1929-05-29	1929-09-04
1948	1948-06-01	1948-08-27
1949	1949-05-04	1949-08-27
1950	1950-06-25	1950-07-12
1952	1952-07-05	1952-09-13
1953	1953-05-09	1953-09-03
1954	1954-06-10	1954-07-13
1955	1955-07-15	1955-07-17
1969	1969-05-28	1969-08-30
1970	1970-08-10	1970-08-14
1971	1971-06-17	1971-08-07
1973	1973-07-07	1973-09-02
1974	1974-07-08	1974-08-21
1975	1975-05-23	1975-08-02

Every Fixed Threshold

Fixed thresholds at Sudbury
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	23	24	1919	14
35 C (95 F): Days	2	8	1921	2
90 F (32.2 C): Days	12	10	1921	2
100 F (37.8 C): Days	1	1	1975	1
0 C (32 F): Ice days (max	25	115	1926	104
0 C (32 F): Frost days (min	23	200	1925	161
-10 C (14 F): Days with min	23	116	1926	91
-20 C (-4 F): Days with min	23	63	1929	29
-30 C (-22 F): Days with min	22	22	1920	5
-40 C (-40 F): Days with min	5	2	1920	1
20 C (68 F): Tropical nights (min	14	13	1973	5
10 mm (0.39 in): Days with 10 mm or more rain	27	31	1970	24
25 mm (0.98 in): Days with 25 mm or more rain	26	8	1970	1
50 mm (1.97 in): Days with 50 mm or more rain	5	2	1954	2
10 cm (3.9 in): Days with 10 cm or more snowfall	25	9	1929	8
25 cm (9.8 in): Days with 25 cm or more snowfall	3	2	1974	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1888.

Download the Data

Data for Sudbury 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 Threshold Days by Year (CA006068148)

Key Facts for Sudbury Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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