Sudbury Weather Records (CA006068148)

Record envelope, standing records and threshold days for Sudbury (CA006068148), Ontario, Canada, with 91 years of record.

Key Facts for Sudbury

Sudbury (CA006068148) is a weather station in Ontario, Canada at 46.48 latitude and -80.98 longitude, 259 m (850 ft) above sea level.
The station reports from 1887 to 1977, 91 years of record.
1,464 records set at Sudbury still stand.
Records are tracked for tmax, prcp, snow: an element needs 30 years of data to be eligible.

About the Station

Location: Ontario, Canada, 46.48 latitude, -80.98 longitude.
Elevation: 259 m (850 ft).
Period of record: 1887 to 1977, 91 years.
Eligible elements: tmax, prcp, snow.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Sudbury. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Sudbury, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	7.2 C (45.0 F)	-42.8 C (-45.0 F)	n/a	n/a
Feb	9.4 C (48.9 F)	-42.8 C (-45.0 F)	n/a	n/a
Mar	15.0 C (59.0 F)	-41.1 C (-42.0 F)	n/a	n/a
Apr	25.6 C (78.1 F)	-27.8 C (-18.0 F)	n/a	n/a
May	31.7 C (89.1 F)	-12.8 C (9.0 F)	n/a	n/a
Jun	35.6 C (96.1 F)	-1.1 C (30.0 F)	n/a	n/a
Jul	37.8 C (100.0 F)	1.7 C (35.1 F)	n/a	n/a
Aug	35.6 C (96.1 F)	0.0 C (32.0 F)	n/a	n/a
Sep	33.9 C (93.0 F)	-4.4 C (24.1 F)	n/a	n/a
Oct	26.7 C (80.1 F)	-15.0 C (5.0 F)	n/a	n/a
Nov	16.7 C (62.1 F)	-31.7 C (-25.1 F)	n/a	n/a
Dec	10.6 C (51.1 F)	-39.4 C (-38.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Sudbury still stand. 1889 holds the most, with 107.

Standing records at Sudbury by the year they were set
Year set	Standing records
1887	34
1888	65
1889	107
1918	36
1919	64
1920	60
1921	70
1922	53
1923	61
1924	46
1925	67
1926	43
1929	45
1930	38
1947	18
1948	46
1949	52
1950	51
1952	38
1953	44
1954	40
1955	31
1969	32
1970	36
1971	29
1972	29
1973	61
1974	35
1975	55
1976	41
1977	37

Wettest Day of Each Month

Sep: 90.2 mm (3.6 in)

The wettest day on record for each calendar month at Sudbury. The most was 90.2 mm (3.6 in) on 18 September 1947.

Record daily precipitation for each month at Sudbury
Month	Record daily precipitation (mm)	Date
Jan	32.0 mm (1.3 in)	10 January 1975
Feb	27.4 mm (1.1 in)	22 February 1974
Mar	59.9 mm (2.4 in)	1 March 1954
Apr	33.5 mm (1.3 in)	4 April 1955
May	47.5 mm (1.9 in)	1 May 1949
Jun	52.8 mm (2.1 in)	28 June 1921
Jul	50.0 mm (2.0 in)	24 July 1977
Aug	58.4 mm (2.3 in)	18 August 1974
Sep	90.2 mm (3.6 in)	18 September 1947
Oct	72.9 mm (2.9 in)	15 October 1954
Nov	35.6 mm (1.4 in)	19 November 1914
Dec	38.6 mm (1.5 in)	2 December 1921

Period of Record Coverage

1887 to 1977

31 years of record at Sudbury, 1887 to 1977. 6 years have data for under 90 percent of days and are left out of rankings: 1887, 1918, 1930, 1947, 1976, 1977.

Days with data per year at Sudbury
Year	Days with data	Share of year	Complete
1887	201	55%	No
1888	345	94%	Yes
1889	334	92%	Yes
1918	228	62%	No
1919	365	100%	Yes
1920	366	100%	Yes
1921	365	100%	Yes
1922	365	100%	Yes
1923	365	100%	Yes
1924	366	100%	Yes
1925	365	100%	Yes
1926	365	100%	Yes
1929	365	100%	Yes
1930	212	58%	No
1947	96	26%	No
1948	366	100%	Yes
1949	365	100%	Yes
1950	365	100%	Yes
1952	366	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	347	95%	Yes
1969	364	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	243	66%	No
1977	240	66%	No

Latest Records

No records were set at this station in the latest data.

Climate Trend

23 complete years, 1919 to 1975

One stripe for each of 23 complete years at Sudbury, 1919 to 1975. Blue stripes are years cooler than the station's own mean of 4.4 C (39.8 F); red stripes are warmer. The coolest year was 1926, at 2.5 C (36.5 F), and the warmest was 1973, at 6.0 C (42.8 F). The strongest colour marks a difference of 1.9 C (3.4 F).

Annual mean temperature at Sudbury as warming stripes, 1919 to 1975
Year	Annual mean temperature	Difference from the station mean
1919	4.3 C	-0.11 C
1920	3.6 C	-0.76 C
1921	5.5 C	+1.16 C
1922	4.2 C	-0.21 C
1923	3.2 C	-1.13 C
1924	2.7 C	-1.64 C
1925	3.5 C	-0.86 C
1926	2.5 C	-1.84 C
1929	2.9 C	-1.50 C
1948	5.0 C	+0.64 C
1949	5.3 C	+0.94 C
1950	3.7 C	-0.68 C
1952	5.4 C	+1.01 C
1953	5.9 C	+1.49 C
1954	4.4 C	-0.01 C
1955	4.9 C	+0.52 C
1969	4.9 C	+0.57 C
1970	4.4 C	+0.05 C
1971	5.0 C	+0.66 C
1972	3.4 C	-1.01 C
1973	6.0 C	+1.62 C
1974	4.4 C	+0.02 C
1975	5.4 C	+1.04 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1887 to 1977

Yearly extremes at Sudbury: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	37.8 C (100.0 F)	1975	31.7 C (89.1 F)	31
Coldest night (TNn)	-42.8 C (-45.0 F)	1888	-36.1 C (-33.0 F)	31
Wettest day (Rx1day)	90.2 mm (3.6 in)	1947	38.1 mm (1.5 in)	33
Wettest five days (Rx5day)	140.5 mm (5.5 in)	1947	59.2 mm (2.3 in)	33
Longest dry spell (CDD)	38 days	1915	17 days	33

Hottest day (TXx)

The hottest day of the year at Sudbury, 1887 to 1977. The record is 37.8 C (100.0 F) in 1975, marked on the chart; the median year is 31.7 C (89.1 F).

Hottest day (TXx) at Sudbury by year
Year	Hottest day (TXx)
1887	35.6 C (96.1 F)
1888	33.9 C (93.0 F)
1889	30.6 C (87.1 F)
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	32.2 C (90.0 F)
1919	34.4 C (93.9 F)
1920	30.0 C (86.0 F)
1921	37.2 C (99.0 F)
1922	31.7 C (89.1 F)
1923	31.7 C (89.1 F)
1924	28.9 C (84.0 F)
1925	32.2 C (90.0 F)
1926	30.0 C (86.0 F)
1929	32.2 C (90.0 F)
1930	30.6 C (87.1 F)
1947	25.6 C (78.1 F)
1948	33.3 C (91.9 F)
1949	34.4 C (93.9 F)
1950	30.0 C (86.0 F)
1952	31.7 C (89.1 F)
1953	33.9 C (93.0 F)
1954	30.6 C (87.1 F)
1955	32.8 C (91.0 F)
1969	32.8 C (91.0 F)
1970	31.1 C (88.0 F)
1971	32.2 C (90.0 F)
1972	29.4 C (84.9 F)
1973	31.7 C (89.1 F)
1974	31.7 C (89.1 F)
1975	37.8 C (100.0 F)
1976	30.0 C (86.0 F)
1977	34.4 C (93.9 F)

Coldest night (TNn)

The coldest night of the year at Sudbury, 1887 to 1977. The record is -42.8 C (-45.0 F) in 1888, marked on the chart; the median year is -36.1 C (-33.0 F).

Coldest night (TNn) at Sudbury by year
Year	Coldest night (TNn)
1887	-38.9 C (-38.0 F)
1888	-42.8 C (-45.0 F)
1889	-23.3 C (-9.9 F)
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	-19.4 C (-2.9 F)
1919	-34.4 C (-29.9 F)
1920	-40.0 C (-40.0 F)
1921	-39.4 C (-38.9 F)
1922	-36.7 C (-34.1 F)
1923	-40.0 C (-40.0 F)
1924	-40.6 C (-41.1 F)
1925	-36.7 C (-34.1 F)
1926	-37.2 C (-35.0 F)
1929	-37.2 C (-35.0 F)
1930	-40.6 C (-41.1 F)
1947	-26.7 C (-16.1 F)
1948	-38.9 C (-38.0 F)
1949	-30.6 C (-23.1 F)
1950	-41.1 C (-42.0 F)
1952	-41.1 C (-42.0 F)
1953	-32.8 C (-27.0 F)
1954	-37.2 C (-35.0 F)
1955	-33.3 C (-27.9 F)
1969	-30.0 C (-22.0 F)
1970	-36.1 C (-33.0 F)
1971	-35.6 C (-32.1 F)
1972	-34.4 C (-29.9 F)
1973	-32.2 C (-26.0 F)
1974	-29.4 C (-20.9 F)
1975	-31.7 C (-25.1 F)
1976	-35.6 C (-32.1 F)
1977	-35.0 C (-31.0 F)

Wettest day (Rx1day)

The wettest day of the year at Sudbury, 1887 to 1977. The record is 90.2 mm (3.6 in) in 1947, marked on the chart; the median year is 38.1 mm (1.5 in).

Wettest day (Rx1day) at Sudbury by year
Year	Wettest day (Rx1day)
1887	0.0 mm (0.00 in)
1888	n/a
1889	n/a
1914	41.4 mm (1.6 in)
1915	37.1 mm (1.5 in)
1916	34.3 mm (1.4 in)
1917	36.1 mm (1.4 in)
1918	45.0 mm (1.8 in)
1919	35.8 mm (1.4 in)
1920	54.4 mm (2.1 in)
1921	52.8 mm (2.1 in)
1922	25.4 mm (1.0 in)
1923	33.0 mm (1.3 in)
1924	34.8 mm (1.4 in)
1925	23.4 mm (0.9 in)
1926	36.6 mm (1.4 in)
1929	33.0 mm (1.3 in)
1930	25.4 mm (1.0 in)
1947	90.2 mm (3.6 in)
1948	39.4 mm (1.6 in)
1949	47.5 mm (1.9 in)
1950	34.5 mm (1.4 in)
1952	44.2 mm (1.7 in)
1953	38.1 mm (1.5 in)
1954	72.9 mm (2.9 in)
1955	46.5 mm (1.8 in)
1969	38.1 mm (1.5 in)
1970	79.8 mm (3.1 in)
1971	35.6 mm (1.4 in)
1972	48.8 mm (1.9 in)
1973	33.8 mm (1.3 in)
1974	58.4 mm (2.3 in)
1975	32.0 mm (1.3 in)
1976	49.5 mm (1.9 in)
1977	50.0 mm (2.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Sudbury, 1887 to 1977. The record is 140.5 mm (5.5 in) in 1947, marked on the chart; the median year is 59.2 mm (2.3 in).

Wettest five days (Rx5day) at Sudbury by year
Year	Wettest five days (Rx5day)
1887	0.0 mm (0.00 in)
1888	n/a
1889	n/a
1914	54.9 mm (2.2 in)
1915	44.4 mm (1.7 in)
1916	67.8 mm (2.7 in)
1917	55.9 mm (2.2 in)
1918	53.9 mm (2.1 in)
1919	61.5 mm (2.4 in)
1920	54.4 mm (2.1 in)
1921	52.8 mm (2.1 in)
1922	70.9 mm (2.8 in)
1923	59.2 mm (2.3 in)
1924	54.6 mm (2.1 in)
1925	33.0 mm (1.3 in)
1926	68.0 mm (2.7 in)
1929	62.7 mm (2.5 in)
1930	59.0 mm (2.3 in)
1947	140.5 mm (5.5 in)
1948	64.7 mm (2.5 in)
1949	68.6 mm (2.7 in)
1950	67.5 mm (2.7 in)
1952	53.1 mm (2.1 in)
1953	48.7 mm (1.9 in)
1954	117.8 mm (4.6 in)
1955	65.1 mm (2.6 in)
1969	72.0 mm (2.8 in)
1970	105.2 mm (4.1 in)
1971	41.5 mm (1.6 in)
1972	67.6 mm (2.7 in)
1973	55.7 mm (2.2 in)
1974	78.8 mm (3.1 in)
1975	51.3 mm (2.0 in)
1976	74.6 mm (2.9 in)
1977	52.8 mm (2.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Sudbury, 1887 to 1977. The record is 38 days in 1915, marked on the chart; the median year is 17 days.

Longest dry spell (CDD) at Sudbury by year
Year	Longest dry spell (CDD)
1887	24 days
1888	n/a
1889	n/a
1914	9 days
1915	38 days
1916	17 days
1917	14 days
1918	25 days
1919	17 days
1920	22 days
1921	13 days
1922	18 days
1923	21 days
1924	26 days
1925	36 days
1926	16 days
1929	18 days
1930	12 days
1947	17 days
1948	16 days
1949	19 days
1950	15 days
1952	17 days
1953	19 days
1954	15 days
1955	17 days
1969	14 days
1970	20 days
1971	13 days
1972	18 days
1973	14 days
1974	14 days
1975	19 days
1976	28 days
1977	11 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Frost Dates and Growing Season

23 years with a frost

Across 23 years with a frost, the median last spring frost at Sudbury falls on 15 May and the median first autumn frost on 30 September, which leaves a median of 141 days between them.

Frost dates and growing season at Sudbury
Measure	Median, all years	Earliest period	Recent period (1919 to 1975)	Recent against earliest	Fitted trend
Last spring frost	15 May	n/a	15 May	n/a	n/a
First autumn frost	30 September	n/a	30 September	n/a	n/a
Growing days	141 days	n/a	141 days	n/a	n/a

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Download the Data

Data for Sudbury standing records by year: CSV or JSON. Field meanings are on the data page.
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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-15. Last revised 15 October 2026 (2026-10-15).