Trenton Ont Hydro Weather Records (CA006158885)

Record envelope, standing records and threshold days for Trenton Ont Hydro (CA006158885), Ontario, Canada, with 78 years of record.

Key Facts for Trenton Ont Hydro

Trenton Ont Hydro (CA006158885) is a weather station in Ontario, Canada at 44.13 latitude and -77.60 longitude, 88 m (289 ft) above sea level.
The station reports from 1915 to 1992, 78 years of record.
1,464 records set at Trenton Ont Hydro still stand.
Records are tracked for prcp, snow: an element needs 30 years of data to be eligible.
Trenton Ont Hydro tied a daily record precipitation of 17.0 mm (0.7 in) on 28 December 1983.

About the Station

Location: Ontario, Canada, 44.13 latitude, -77.60 longitude.
Elevation: 88 m (289 ft).
Period of record: 1915 to 1992, 78 years.
Eligible elements: 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 Trenton Ont Hydro. 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 Trenton Ont Hydro, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	11.1 C (52.0 F)	-32.2 C (-26.0 F)	n/a	n/a
Feb	12.2 C (54.0 F)	-27.2 C (-17.0 F)	n/a	n/a
Mar	21.1 C (70.0 F)	-23.3 C (-9.9 F)	n/a	n/a
Apr	25.6 C (78.1 F)	-14.4 C (6.1 F)	n/a	n/a
May	29.4 C (84.9 F)	-4.4 C (24.1 F)	n/a	n/a
Jun	31.1 C (88.0 F)	0.6 C (33.1 F)	n/a	n/a
Jul	33.3 C (91.9 F)	6.7 C (44.1 F)	n/a	n/a
Aug	32.2 C (90.0 F)	3.3 C (37.9 F)	n/a	n/a
Sep	28.3 C (82.9 F)	-1.7 C (28.9 F)	n/a	n/a
Oct	19.4 C (66.9 F)	-8.9 C (16.0 F)	n/a	n/a
Nov	19.4 C (66.9 F)	-16.1 C (3.0 F)	n/a	n/a
Dec	11.1 C (52.0 F)	-30.6 C (-23.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Trenton Ont Hydro still stand. 1976 holds the most, with 296.

Wettest Day of Each Month

Aug: 90.2 mm (3.6 in)

The wettest day on record for each calendar month at Trenton Ont Hydro. The most was 90.2 mm (3.6 in) on 31 August 1941.

Record daily precipitation for each month at Trenton Ont Hydro
Month	Record daily precipitation (mm)	Date
Jan	50.8 mm (2.0 in)	16 January 1924
Feb	45.7 mm (1.8 in)	17 February 1920
Mar	53.8 mm (2.1 in)	11 March 1936
Apr	56.1 mm (2.2 in)	7 April 1917
May	58.4 mm (2.3 in)	23 May 1962
Jun	62.2 mm (2.4 in)	18 June 1934
Jul	87.9 mm (3.5 in)	14 July 1945
Aug	90.2 mm (3.6 in)	31 August 1941
Sep	63.5 mm (2.5 in)	21 September 1938
Oct	64.8 mm (2.6 in)	14 October 1955
Nov	40.6 mm (1.6 in)	13 November 1937
Dec	38.1 mm (1.5 in)	9 December 1937

Period of Record Coverage

1972 to 1978

7 years of record at Trenton Ont Hydro, 1972 to 1978. 3 years have data for under 90 percent of days and are left out of rankings: 1972, 1973, 1978.

Latest Records

Latest records at Trenton Ont Hydro
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
28 December 1983	Trenton Ont Hydro, CA	daily rain (Tie)	17.0 mm (0.7 in)	tie	5 years	1 of 100 (Routine)
28 December 1983	Trenton Ont Hydro, CA	daily snowfall (Tie)	17.0 cm (6.7 in)	tie	5 years	1 of 100 (Routine)
11 December 1983	Trenton Ont Hydro, CA	daily rain	20.0 mm (0.8 in)	7.3 mm (0.29 in)	18 years	20 of 100 (Routine)
15 November 1983	Trenton Ont Hydro, CA	daily rain	26.2 mm (1.0 in)	4.9 mm (0.19 in)	17 years	17 of 100 (Routine)
11 November 1983	Trenton Ont Hydro, CA	daily snowfall	13.0 cm (5.1 in)	9.2 cm (3.6 in)	49 years	38 of 100 (Notable)
4 October 1983	Trenton Ont Hydro, CA	daily rain	44.6 mm (1.8 in)	13.9 mm (0.5 in)	20 years	28 of 100 (Routine)
30 August 1983	Trenton Ont Hydro, CA	daily rain	23.5 mm (0.9 in)	0.1 mm (0.00 in)	1 year	6 of 100 (Routine)
1 May 1983	Trenton Ont Hydro, CA	daily rain	16.0 mm (0.6 in)	0.8 mm (0.03 in)	29 years	15 of 100 (Routine)
20 April 1983	Trenton Ont Hydro, CA	daily snowfall	2.0 cm (0.8 in)	2.0 cm (0.8 in)	66 years	20 of 100 (Routine)
18 March 1983	Trenton Ont Hydro, CA	daily rain	17.8 mm (0.7 in)	3.3 mm (0.13 in)	65 years	20 of 100 (Routine)
2 February 1983	Trenton Ont Hydro, CA	daily rain	45.2 mm (1.8 in)	28.7 mm (1.1 in)	60 years	64 of 100 (Major)
10 January 1983	Trenton Ont Hydro, CA	daily rain	36.6 mm (1.4 in)	11.2 mm (0.4 in)	5 years	23 of 100 (Routine)
11 July 1982	Trenton Ont Hydro, CA	daily rain	14.0 mm (0.6 in)	1.0 mm (0.04 in)	52 years	20 of 100 (Routine)
5 June 1982	Trenton Ont Hydro, CA	daily rain	20.1 mm (0.8 in)	5.4 mm (0.21 in)	44 years	20 of 100 (Routine)
8 May 1982	Trenton Ont Hydro, CA	daily rain	19.6 mm (0.8 in)	5.4 mm (0.21 in)	19 years	17 of 100 (Routine)
31 January 1982	Trenton Ont Hydro, CA	daily snowfall	15.0 cm (5.9 in)	2.3 cm (0.9 in)	48 years	24 of 100 (Routine)
4 January 1982	Trenton Ont Hydro, CA	daily rain	16.5 mm (0.6 in)	2.5 mm (0.10 in)	38 years	20 of 100 (Routine)
30 August 1981	Trenton Ont Hydro, CA	daily rain	23.4 mm (0.9 in)	3.1 mm (0.12 in)	26 years	15 of 100 (Routine)
15 August 1981	Trenton Ont Hydro, CA	daily rain	38.4 mm (1.5 in)	13.5 mm (0.5 in)	30 years	27 of 100 (Routine)
27 May 1981	Trenton Ont Hydro, CA	daily rain	26.2 mm (1.0 in)	14.0 mm (0.6 in)	48 years	37 of 100 (Notable)

Extremes by Year

1915 to 1983

Yearly extremes at Trenton Ont Hydro: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	33.3 C (91.9 F)	1977	31.1 C (88.0 F)	7
Coldest night (TNn)	-32.2 C (-26.0 F)	1976	-26.7 C (-16.1 F)	7
Wettest day (Rx1day)	90.2 mm (3.6 in)	1941	42.7 mm (1.7 in)	69
Wettest five days (Rx5day)	147.8 mm (5.8 in)	1955	64.3 mm (2.5 in)	69
Longest dry spell (CDD)	31 days	1978	17 days	69

Hottest day (TXx)

The hottest day of the year at Trenton Ont Hydro, 1915 to 1983. The record is 33.3 C (91.9 F) in 1977, marked on the chart; the median year is 31.1 C (88.0 F).

Hottest day (TXx) at Trenton Ont Hydro by year
Year	Hottest day (TXx)
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	28.9 C (84.0 F)
1973	30.0 C (86.0 F)
1974	31.1 C (88.0 F)
1975	32.2 C (90.0 F)
1976	31.1 C (88.0 F)
1977	33.3 C (91.9 F)
1978	8.9 C (48.0 F)
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a

Coldest night (TNn)

The coldest night of the year at Trenton Ont Hydro, 1915 to 1983. The record is -32.2 C (-26.0 F) in 1976, marked on the chart; the median year is -26.7 C (-16.1 F).

Coldest night (TNn) at Trenton Ont Hydro by year
Year	Coldest night (TNn)
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	-21.7 C (-7.1 F)
1973	-23.3 C (-9.9 F)
1974	-23.3 C (-9.9 F)
1975	-26.7 C (-16.1 F)
1976	-32.2 C (-26.0 F)
1977	-31.1 C (-24.0 F)
1978	-26.7 C (-16.1 F)
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a

Wettest day (Rx1day)

The wettest day of the year at Trenton Ont Hydro, 1915 to 1983. The record is 90.2 mm (3.6 in) in 1941, marked on the chart; the median year is 42.7 mm (1.7 in).

Wettest day (Rx1day) at Trenton Ont Hydro by year
Year	Wettest day (Rx1day)
1915	28.4 mm (1.1 in)
1916	45.2 mm (1.8 in)
1917	56.1 mm (2.2 in)
1918	50.8 mm (2.0 in)
1919	33.0 mm (1.3 in)
1920	45.7 mm (1.8 in)
1921	36.8 mm (1.4 in)
1922	44.5 mm (1.8 in)
1923	45.2 mm (1.8 in)
1924	52.8 mm (2.1 in)
1925	49.8 mm (2.0 in)
1926	39.9 mm (1.6 in)
1927	49.5 mm (1.9 in)
1928	35.6 mm (1.4 in)
1929	43.2 mm (1.7 in)
1930	32.5 mm (1.3 in)
1931	38.1 mm (1.5 in)
1932	52.3 mm (2.1 in)
1933	27.9 mm (1.1 in)
1934	62.2 mm (2.4 in)
1935	36.8 mm (1.4 in)
1936	53.8 mm (2.1 in)
1937	42.4 mm (1.7 in)
1938	63.5 mm (2.5 in)
1939	39.9 mm (1.6 in)
1940	48.3 mm (1.9 in)
1941	90.2 mm (3.6 in)
1942	33.5 mm (1.3 in)
1943	55.9 mm (2.2 in)
1944	36.8 mm (1.4 in)
1945	87.9 mm (3.5 in)
1946	28.7 mm (1.1 in)
1947	38.1 mm (1.5 in)
1948	32.3 mm (1.3 in)
1949	35.6 mm (1.4 in)
1950	42.7 mm (1.7 in)
1951	52.1 mm (2.1 in)
1952	44.2 mm (1.7 in)
1953	47.8 mm (1.9 in)
1954	25.7 mm (1.0 in)
1955	64.8 mm (2.6 in)
1956	53.1 mm (2.1 in)
1957	41.4 mm (1.6 in)
1958	50.8 mm (2.0 in)
1959	62.7 mm (2.5 in)
1960	27.9 mm (1.1 in)
1961	33.0 mm (1.3 in)
1962	58.4 mm (2.3 in)
1963	29.5 mm (1.2 in)
1964	53.8 mm (2.1 in)
1965	52.1 mm (2.1 in)
1966	42.7 mm (1.7 in)
1967	58.9 mm (2.3 in)
1968	36.1 mm (1.4 in)
1969	50.0 mm (2.0 in)
1970	33.0 mm (1.3 in)
1971	30.2 mm (1.2 in)
1972	39.6 mm (1.6 in)
1973	59.7 mm (2.4 in)
1974	36.8 mm (1.4 in)
1975	33.3 mm (1.3 in)
1976	30.2 mm (1.2 in)
1977	67.3 mm (2.6 in)
1978	39.0 mm (1.5 in)
1979	34.2 mm (1.3 in)
1980	63.4 mm (2.5 in)
1981	40.0 mm (1.6 in)
1982	38.7 mm (1.5 in)
1983	45.2 mm (1.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Trenton Ont Hydro, 1915 to 1983. The record is 147.8 mm (5.8 in) in 1955, marked on the chart; the median year is 64.3 mm (2.5 in).

Wettest five days (Rx5day) at Trenton Ont Hydro by year
Year	Wettest five days (Rx5day)
1915	47.0 mm (1.9 in)
1916	62.7 mm (2.5 in)
1917	74.6 mm (2.9 in)
1918	89.9 mm (3.5 in)
1919	55.0 mm (2.2 in)
1920	69.9 mm (2.8 in)
1921	71.1 mm (2.8 in)
1922	64.3 mm (2.5 in)
1923	67.3 mm (2.6 in)
1924	75.9 mm (3.0 in)
1925	59.7 mm (2.4 in)
1926	61.7 mm (2.4 in)
1927	69.3 mm (2.7 in)
1928	72.4 mm (2.9 in)
1929	78.8 mm (3.1 in)
1930	66.3 mm (2.6 in)
1931	63.5 mm (2.5 in)
1932	58.5 mm (2.3 in)
1933	47.8 mm (1.9 in)
1934	64.2 mm (2.5 in)
1935	60.1 mm (2.4 in)
1936	73.3 mm (2.9 in)
1937	66.6 mm (2.6 in)
1938	83.1 mm (3.3 in)
1939	65.6 mm (2.6 in)
1940	132.9 mm (5.2 in)
1941	90.2 mm (3.6 in)
1942	60.6 mm (2.4 in)
1943	63.0 mm (2.5 in)
1944	53.9 mm (2.1 in)
1945	99.4 mm (3.9 in)
1946	43.9 mm (1.7 in)
1947	69.3 mm (2.7 in)
1948	58.4 mm (2.3 in)
1949	52.1 mm (2.1 in)
1950	69.1 mm (2.7 in)
1951	60.8 mm (2.4 in)
1952	74.4 mm (2.9 in)
1953	50.6 mm (2.0 in)
1954	52.0 mm (2.0 in)
1955	147.8 mm (5.8 in)
1956	53.4 mm (2.1 in)
1957	62.0 mm (2.4 in)
1958	77.0 mm (3.0 in)
1959	68.8 mm (2.7 in)
1960	58.4 mm (2.3 in)
1961	46.2 mm (1.8 in)
1962	58.4 mm (2.3 in)
1963	45.2 mm (1.8 in)
1964	53.8 mm (2.1 in)
1965	63.5 mm (2.5 in)
1966	65.5 mm (2.6 in)
1967	78.5 mm (3.1 in)
1968	42.7 mm (1.7 in)
1969	95.0 mm (3.7 in)
1970	70.1 mm (2.8 in)
1971	48.0 mm (1.9 in)
1972	73.6 mm (2.9 in)
1973	76.2 mm (3.0 in)
1974	72.6 mm (2.9 in)
1975	58.9 mm (2.3 in)
1976	51.0 mm (2.0 in)
1977	71.4 mm (2.8 in)
1978	53.5 mm (2.1 in)
1979	59.2 mm (2.3 in)
1980	89.7 mm (3.5 in)
1981	99.2 mm (3.9 in)
1982	52.7 mm (2.1 in)
1983	74.6 mm (2.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Trenton Ont Hydro, 1915 to 1983. The record is 31 days in 1978, marked on the chart; the median year is 17 days.

Longest dry spell (CDD) at Trenton Ont Hydro by year
Year	Longest dry spell (CDD)
1915	16 days
1916	20 days
1917	19 days
1918	17 days
1919	18 days
1920	22 days
1921	15 days
1922	29 days
1923	14 days
1924	24 days
1925	18 days
1926	27 days
1927	21 days
1928	16 days
1929	18 days
1930	15 days
1931	17 days
1932	13 days
1933	11 days
1934	17 days
1935	23 days
1936	19 days
1937	15 days
1938	23 days
1939	22 days
1940	14 days
1941	17 days
1942	17 days
1943	19 days
1944	20 days
1945	13 days
1946	20 days
1947	13 days
1948	14 days
1949	19 days
1950	14 days
1951	14 days
1952	18 days
1953	20 days
1954	16 days
1955	16 days
1956	15 days
1957	28 days
1958	20 days
1959	16 days
1960	16 days
1961	16 days
1962	11 days
1963	28 days
1964	23 days
1965	15 days
1966	16 days
1967	21 days
1968	20 days
1969	24 days
1970	22 days
1971	15 days
1972	11 days
1973	14 days
1974	13 days
1975	15 days
1976	21 days
1977	21 days
1978	31 days
1979	14 days
1980	12 days
1981	15 days
1982	16 days
1983	19 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.

Rainfall Return Levels

68 years, 1916 to 1983

A day with at least 43.1 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 87.2 mm (3.4 in) of rain is expected about once in 100 years.

Rainfall return levels at Trenton Ont Hydro: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	43.1 mm (1.7 in)
5 years	54.7 mm (2.2 in)
10 years	62.4 mm (2.5 in)
25 years	72.4 mm (2.9 in)
50 years	79.8 mm (3.1 in)
100 years	87.2 mm (3.4 in)	Longer than the 68 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 68 years of values from 1916 to 1983.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 90.2 mm (3.6 in) in 1941; 87.9 mm (3.5 in) in 1945; 67.3 mm (2.6 in) in 1977.

Download the Data

Data for Trenton Ont Hydro standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Trenton Ont Hydro 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).

Year	Days with data	Share of year	Complete
1972	275	75%	No
1973	122	33%	No
1974	335	92%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	90	25%	No