Trenton A Weather Records (CA006158875)

Record envelope, standing records and threshold days for Trenton A (CA006158875), Ontario, Canada, with 92 years of record.

Key Facts for Trenton A

Trenton A (CA006158875) is a weather station in Ontario, Canada at 44.12 latitude and -77.53 longitude, 86 m (282 ft) above sea level.
The station reports from 1935 to 2026, 92 years of record.
1,464 records set at Trenton A still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Trenton A set a daily record snowfall of 11.6 cm (4.6 in) on 26 December 1983.

About the Station

Location: Ontario, Canada, 44.12 latitude, -77.53 longitude.
Elevation: 86 m (282 ft).
Period of record: 1935 to 2026, 92 years.
Eligible elements: tmax, tmin, 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 A. 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 A, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	14.4 C (57.9 F)	-33.9 C (-29.0 F)	n/a	n/a
Feb	13.5 C (56.3 F)	-32.2 C (-26.0 F)	n/a	n/a
Mar	22.8 C (73.0 F)	-28.9 C (-20.0 F)	n/a	n/a
Apr	27.2 C (81.0 F)	-14.4 C (6.1 F)	n/a	n/a
May	33.3 C (91.9 F)	-6.1 C (21.0 F)	n/a	n/a
Jun	35.6 C (96.1 F)	1.1 C (34.0 F)	n/a	n/a
Jul	38.9 C (102.0 F)	5.6 C (42.1 F)	n/a	n/a
Aug	36.1 C (97.0 F)	3.3 C (37.9 F)	n/a	n/a
Sep	35.0 C (95.0 F)	-4.6 C (23.7 F)	n/a	n/a
Oct	25.6 C (78.1 F)	-8.3 C (17.1 F)	n/a	n/a
Nov	22.8 C (73.0 F)	-19.4 C (-2.9 F)	n/a	n/a
Dec	16.2 C (61.2 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 A still stand. 1940 holds the most, with 60.

Standing records at Trenton A by the year they were set
Year set	Standing records
1935	28
1936	29
1937	6
1938	16
1939	10
1940	60
1941	36
1942	30
1943	29
1944	30
1945	48
1946	41
1947	36
1948	38
1949	46
1950	31
1951	31
1952	22
1953	32
1954	26
1955	37
1956	25
1957	31
1958	15
1959	42
1960	12
1961	22
1962	26
1963	30
1964	31
1965	50
1966	34
1967	34
1968	26
1969	16
1970	19
1971	23
1972	22
1973	23
1974	29
1975	27
1976	40
1977	32
1978	22
1979	45
1980	32
1981	32
1982	26
1983	36

All-Time Record Progression

2 new records

2 all-time records were set at Trenton A between 3 January 1981 and 4 January 1981. Each dot is a new record.

When Trenton A set new all-time records
Date	Kind	Detail
1981-01-03	Record low maximum temperature	Record low maximum temperature -24.2 C (-11.6 F)
1981-01-04	Record low minimum temperature	Record low minimum temperature -33.9 C (-29.0 F)

Wettest Day of Each Month

Dec: 97.0 mm (3.8 in)

The wettest day on record for each calendar month at Trenton A. The most was 97.0 mm (3.8 in) on 24 December 1941.

Record daily precipitation for each month at Trenton A
Month	Record daily precipitation (mm)	Date
Jan	54.2 mm (2.1 in)	26 January 1978
Feb	38.6 mm (1.5 in)	2 February 1983
Mar	58.2 mm (2.3 in)	21 March 1980
Apr	40.6 mm (1.6 in)	28 April 1959
May	71.1 mm (2.8 in)	11 May 1943
Jun	56.4 mm (2.2 in)	7 June 1947
Jul	70.6 mm (2.8 in)	16 July 1951
Aug	72.0 mm (2.8 in)	16 August 1977
Sep	64.5 mm (2.5 in)	28 September 1967
Oct	64.5 mm (2.5 in)	14 October 1955
Nov	40.4 mm (1.6 in)	7 November 1951
Dec	97.0 mm (3.8 in)	24 December 1941

Period of Record Coverage

1935 to 1983

49 years of record at Trenton A, 1935 to 1983. 5 years have data for under 90 percent of days and are left out of rankings: 1935, 1936, 1937, 1938, 1939.

Days with data per year at Trenton A
Year	Days with data	Share of year	Complete
1935	323	88%	No
1936	201	55%	No
1937	90	25%	No
1938	217	59%	No
1939	78	21%	No
1940	351	96%	Yes
1941	346	95%	Yes
1942	365	100%	Yes
1943	364	100%	Yes
1944	365	100%	Yes
1945	362	99%	Yes
1946	364	100%	Yes
1947	365	100%	Yes
1948	366	100%	Yes
1949	365	100%	Yes
1950	365	100%	Yes
1951	365	100%	Yes
1952	366	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	365	100%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	365	100%	Yes
1960	366	100%	Yes
1961	365	100%	Yes
1962	365	100%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	364	100%	Yes
1968	366	100%	Yes
1969	365	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	366	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	365	100%	Yes
1981	365	100%	Yes
1982	365	100%	Yes
1983	365	100%	Yes

Latest Records

Latest records at Trenton A
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
26 December 1983	Trenton A, CA	daily snowfall	11.6 cm (4.6 in)	0.3 cm (0.1 in)	2 years	4 of 100 (Routine)
22 December 1983	Trenton A, CA	daily rain	19.6 mm (0.8 in)	7.2 mm (0.28 in)	22 years	19 of 100 (Routine)
12 December 1983	Trenton A, CA	daily rain	51.0 mm (2.0 in)	24.8 mm (1.0 in)	10 years	41 of 100 (Notable)
16 November 1983	Trenton A, CA	daily snowfall	6.2 cm (2.4 in)	2.6 cm (1.0 in)	9 years	11 of 100 (Routine)
13 November 1983	Trenton A, CA	daily low min	-13.1 C (8.4 F)	6.4 C (11.5 F)	28 years	24 of 100 (Routine)
13 November 1983	Trenton A, CA	daily low max	-1.9 C (28.6 F)	2.7 C (4.9 F)	5 years	10 of 100 (Routine)
12 November 1983	Trenton A, CA	daily low min	-8.7 C (16.3 F)	1.0 C (1.8 F)	1 year	5 of 100 (Routine)
12 November 1983	Trenton A, CA	daily low max	1.1 C (34.0 F)	0.4 C (0.7 F)	1 year	4 of 100 (Routine)
12 November 1983	Trenton A, CA	daily snowfall (Tie)	2.8 cm (1.1 in)	tie	24 years	2 of 100 (Routine)
11 November 1983	Trenton A, CA	daily snowfall	6.2 cm (2.4 in)	1.8 cm (0.7 in)	5 years	8 of 100 (Routine)
4 November 1983	Trenton A, CA	daily snowfall	7.0 cm (2.8 in)	1.9 cm (0.7 in)	46 years	21 of 100 (Routine)
13 October 1983	Trenton A, CA	daily high max	25.0 C (77.0 F)	1.7 C (3.1 F)	13 years	11 of 100 (Routine)
12 October 1983	Trenton A, CA	daily rain	21.2 mm (0.8 in)	3.2 mm (0.13 in)	36 years	18 of 100 (Routine)
5 October 1983	Trenton A, CA	daily rain	30.2 mm (1.2 in)	1.2 mm (0.05 in)	20 years	11 of 100 (Routine)
4 October 1983	Trenton A, CA	daily rain	41.6 mm (1.6 in)	32.5 mm (1.3 in)	12 years	44 of 100 (Notable)
3 October 1983	Trenton A, CA	daily high min	16.0 C (60.8 F)	1.0 C (1.8 F)	16 years	10 of 100 (Routine)
16 September 1983	Trenton A, CA	daily rain	18.4 mm (0.7 in)	8.2 mm (0.32 in)	46 years	20 of 100 (Routine)
10 September 1983	Trenton A, CA	daily high max	30.7 C (87.3 F)	0.7 C (1.3 F)	24 years	12 of 100 (Routine)
30 August 1983	Trenton A, CA	daily rain	36.4 mm (1.4 in)	19.1 mm (0.8 in)	20 years	27 of 100 (Routine)
11 August 1983	Trenton A, CA	daily low max	16.9 C (62.4 F)	2.0 C (3.6 F)	28 years	18 of 100 (Routine)

Climate Trend

43 complete years, 1940 to 1983

One stripe for each of 43 complete years at Trenton A, 1940 to 1983. Blue stripes are years cooler than the station's own mean of 7.1 C (44.8 F); red stripes are warmer. The coolest year was 1940, at 5.7 C (42.2 F), and the warmest was 1953, at 8.9 C (48.0 F). The strongest colour marks a difference of 1.8 C (3.2 F).

Annual mean temperature at Trenton A as warming stripes, 1940 to 1983
Year	Annual mean temperature	Difference from the station mean
1940	5.7 C	-1.44 C
1942	7.6 C	+0.55 C
1943	6.7 C	-0.38 C
1944	7.4 C	+0.30 C
1945	6.8 C	-0.32 C
1946	7.6 C	+0.53 C
1947	7.3 C	+0.21 C
1948	7.5 C	+0.38 C
1949	8.4 C	+1.33 C
1950	6.8 C	-0.25 C
1951	7.3 C	+0.25 C
1952	8.3 C	+1.18 C
1953	8.9 C	+1.79 C
1954	7.7 C	+0.59 C
1955	8.3 C	+1.18 C
1956	7.3 C	+0.20 C
1957	8.3 C	+1.19 C
1958	7.2 C	+0.10 C
1959	8.0 C	+0.91 C
1960	7.7 C	+0.61 C
1961	7.5 C	+0.40 C
1962	6.5 C	-0.63 C
1963	6.1 C	-0.97 C
1964	7.2 C	+0.06 C
1965	6.4 C	-0.67 C
1966	6.8 C	-0.32 C
1967	6.7 C	-0.40 C
1968	6.7 C	-0.43 C
1969	6.8 C	-0.29 C
1970	6.6 C	-0.48 C
1971	6.7 C	-0.38 C
1972	5.9 C	-1.17 C
1973	7.9 C	+0.84 C
1974	6.4 C	-0.67 C
1975	7.5 C	+0.40 C
1976	6.0 C	-1.07 C
1977	6.7 C	-0.38 C
1978	5.9 C	-1.17 C
1979	6.8 C	-0.26 C
1980	6.2 C	-0.92 C
1981	6.9 C	-0.19 C
1982	6.4 C	-0.65 C
1983	7.4 C	+0.35 C

The annual mean temperature here has fallen by 0.2 C (0.1 to 0.4) per decade over 1940 to 1983. In Fahrenheit: 0.4 F (0.1 to 0.7) per decade. The slope is a straight line fitted to 43 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Trenton A
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	-0.2 C (-0.4 to -0.1) per decade	-0.4 F (-0.7 to -0.1) per decade	1940 to 1983	43	Fall
Mean daily maximum	-0.1 C (-0.2 to 0.1) per decade	-0.2 F (-0.4 to 0.1) per decade	1940 to 1983	43	Not clearly different from zero
Mean daily minimum	-0.4 C (-0.6 to -0.1) per decade	-0.7 F (-1.0 to -0.3) per decade	1940 to 1983	43	Fall

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

1935 to 1983

Yearly extremes at Trenton A: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	38.9 C (102.0 F)	1936	32.2 C (90.0 F)	49
Coldest night (TNn)	-33.9 C (-29.0 F)	1981	-27.2 C (-17.0 F)	49
Wettest day (Rx1day)	97.0 mm (3.8 in)	1941	45.5 mm (1.8 in)	49
Wettest five days (Rx5day)	174.5 mm (6.9 in)	1955	66.0 mm (2.6 in)	49
Longest dry spell (CDD)	33 days	1936	17 days	49

Hottest day (TXx)

The hottest day of the year at Trenton A, 1935 to 1983. The record is 38.9 C (102.0 F) in 1936, marked on the chart; the median year is 32.2 C (90.0 F).

Hottest day (TXx) at Trenton A by year
Year	Hottest day (TXx)
1935	33.3 C (91.9 F)
1936	38.9 C (102.0 F)
1937	14.4 C (57.9 F)
1938	30.0 C (86.0 F)
1939	30.0 C (86.0 F)
1940	32.8 C (91.0 F)
1941	37.2 C (99.0 F)
1942	31.7 C (89.1 F)
1943	32.2 C (90.0 F)
1944	33.3 C (91.9 F)
1945	31.1 C (88.0 F)
1946	32.2 C (90.0 F)
1947	33.3 C (91.9 F)
1948	36.1 C (97.0 F)
1949	34.4 C (93.9 F)
1950	31.1 C (88.0 F)
1951	29.4 C (84.9 F)
1952	33.3 C (91.9 F)
1953	35.0 C (95.0 F)
1954	32.2 C (90.0 F)
1955	33.9 C (93.0 F)
1956	34.4 C (93.9 F)
1957	32.2 C (90.0 F)
1958	31.1 C (88.0 F)
1959	33.3 C (91.9 F)
1960	30.0 C (86.0 F)
1961	30.6 C (87.1 F)
1962	33.3 C (91.9 F)
1963	32.8 C (91.0 F)
1964	35.6 C (96.1 F)
1965	31.7 C (89.1 F)
1966	35.6 C (96.1 F)
1967	28.3 C (82.9 F)
1968	31.7 C (89.1 F)
1969	31.7 C (89.1 F)
1970	31.7 C (89.1 F)
1971	32.2 C (90.0 F)
1972	30.6 C (87.1 F)
1973	34.4 C (93.9 F)
1974	31.7 C (89.1 F)
1975	31.7 C (89.1 F)
1976	30.6 C (87.1 F)
1977	33.7 C (92.7 F)
1978	31.8 C (89.2 F)
1979	31.7 C (89.1 F)
1980	29.4 C (84.9 F)
1981	32.9 C (91.2 F)
1982	30.8 C (87.4 F)
1983	34.2 C (93.6 F)

Coldest night (TNn)

The coldest night of the year at Trenton A, 1935 to 1983. The record is -33.9 C (-29.0 F) in 1981, marked on the chart; the median year is -27.2 C (-17.0 F).

Coldest night (TNn) at Trenton A by year
Year	Coldest night (TNn)
1935	-25.6 C (-14.1 F)
1936	-27.2 C (-17.0 F)
1937	-25.0 C (-13.0 F)
1938	-28.9 C (-20.0 F)
1939	-27.2 C (-17.0 F)
1940	-28.9 C (-20.0 F)
1941	-24.4 C (-11.9 F)
1942	-30.6 C (-23.1 F)
1943	-32.2 C (-26.0 F)
1944	-27.2 C (-17.0 F)
1945	-31.7 C (-25.1 F)
1946	-30.6 C (-23.1 F)
1947	-22.8 C (-9.0 F)
1948	-31.1 C (-24.0 F)
1949	-24.4 C (-11.9 F)
1950	-27.8 C (-18.0 F)
1951	-27.2 C (-17.0 F)
1952	-25.0 C (-13.0 F)
1953	-18.9 C (-2.0 F)
1954	-26.7 C (-16.1 F)
1955	-25.6 C (-14.1 F)
1956	-21.1 C (-6.0 F)
1957	-30.0 C (-22.0 F)
1958	-26.1 C (-15.0 F)
1959	-25.0 C (-13.0 F)
1960	-23.3 C (-9.9 F)
1961	-24.4 C (-11.9 F)
1962	-29.4 C (-20.9 F)
1963	-27.2 C (-17.0 F)
1964	-23.9 C (-11.0 F)
1965	-26.7 C (-16.1 F)
1966	-27.2 C (-17.0 F)
1967	-28.3 C (-18.9 F)
1968	-31.1 C (-24.0 F)
1969	-23.3 C (-9.9 F)
1970	-28.3 C (-18.9 F)
1971	-30.0 C (-22.0 F)
1972	-25.6 C (-14.1 F)
1973	-27.2 C (-17.0 F)
1974	-22.8 C (-9.0 F)
1975	-25.0 C (-13.0 F)
1976	-31.1 C (-24.0 F)
1977	-30.4 C (-22.7 F)
1978	-23.8 C (-10.8 F)
1979	-30.5 C (-22.9 F)
1980	-30.6 C (-23.1 F)
1981	-33.9 C (-29.0 F)
1982	-28.9 C (-20.0 F)
1983	-25.6 C (-14.1 F)

Wettest day (Rx1day)

The wettest day of the year at Trenton A, 1935 to 1983. The record is 97.0 mm (3.8 in) in 1941, marked on the chart; the median year is 45.5 mm (1.8 in).

Wettest day (Rx1day) at Trenton A by year
Year	Wettest day (Rx1day)
1935	43.4 mm (1.7 in)
1936	39.1 mm (1.5 in)
1937	43.7 mm (1.7 in)
1938	19.1 mm (0.8 in)
1939	17.8 mm (0.7 in)
1940	32.5 mm (1.3 in)
1941	97.0 mm (3.8 in)
1942	43.4 mm (1.7 in)
1943	71.1 mm (2.8 in)
1944	39.9 mm (1.6 in)
1945	55.9 mm (2.2 in)
1946	33.3 mm (1.3 in)
1947	56.4 mm (2.2 in)
1948	34.8 mm (1.4 in)
1949	39.1 mm (1.5 in)
1950	48.3 mm (1.9 in)
1951	70.6 mm (2.8 in)
1952	49.8 mm (2.0 in)
1953	53.6 mm (2.1 in)
1954	28.4 mm (1.1 in)
1955	64.5 mm (2.5 in)
1956	49.5 mm (1.9 in)
1957	47.0 mm (1.9 in)
1958	44.7 mm (1.8 in)
1959	57.9 mm (2.3 in)
1960	27.4 mm (1.1 in)
1961	33.3 mm (1.3 in)
1962	69.9 mm (2.8 in)
1963	49.5 mm (1.9 in)
1964	48.0 mm (1.9 in)
1965	43.9 mm (1.7 in)
1966	45.7 mm (1.8 in)
1967	64.5 mm (2.5 in)
1968	35.8 mm (1.4 in)
1969	40.1 mm (1.6 in)
1970	45.5 mm (1.8 in)
1971	35.3 mm (1.4 in)
1972	37.3 mm (1.5 in)
1973	49.3 mm (1.9 in)
1974	41.4 mm (1.6 in)
1975	32.8 mm (1.3 in)
1976	30.2 mm (1.2 in)
1977	72.0 mm (2.8 in)
1978	54.2 mm (2.1 in)
1979	55.8 mm (2.2 in)
1980	58.2 mm (2.3 in)
1981	47.0 mm (1.9 in)
1982	39.0 mm (1.5 in)
1983	51.0 mm (2.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Trenton A, 1935 to 1983. The record is 174.5 mm (6.9 in) in 1955, marked on the chart; the median year is 66.0 mm (2.6 in).

Wettest five days (Rx5day) at Trenton A by year
Year	Wettest five days (Rx5day)
1935	72.4 mm (2.9 in)
1936	49.8 mm (2.0 in)
1937	69.4 mm (2.7 in)
1938	32.5 mm (1.3 in)
1939	29.0 mm (1.1 in)
1940	77.9 mm (3.1 in)
1941	132.9 mm (5.2 in)
1942	74.9 mm (2.9 in)
1943	77.9 mm (3.1 in)
1944	48.7 mm (1.9 in)
1945	68.0 mm (2.7 in)
1946	50.9 mm (2.0 in)
1947	63.6 mm (2.5 in)
1948	54.9 mm (2.2 in)
1949	65.5 mm (2.6 in)
1950	76.7 mm (3.0 in)
1951	80.8 mm (3.2 in)
1952	67.3 mm (2.6 in)
1953	57.4 mm (2.3 in)
1954	44.5 mm (1.8 in)
1955	174.5 mm (6.9 in)
1956	66.8 mm (2.6 in)
1957	53.6 mm (2.1 in)
1958	77.2 mm (3.0 in)
1959	82.6 mm (3.3 in)
1960	45.2 mm (1.8 in)
1961	52.6 mm (2.1 in)
1962	78.1 mm (3.1 in)
1963	53.0 mm (2.1 in)
1964	49.6 mm (2.0 in)
1965	61.2 mm (2.4 in)
1966	66.0 mm (2.6 in)
1967	78.2 mm (3.1 in)
1968	64.5 mm (2.5 in)
1969	69.3 mm (2.7 in)
1970	65.3 mm (2.6 in)
1971	43.5 mm (1.7 in)
1972	68.8 mm (2.7 in)
1973	73.1 mm (2.9 in)
1974	69.8 mm (2.7 in)
1975	53.8 mm (2.1 in)
1976	52.8 mm (2.1 in)
1977	94.1 mm (3.7 in)
1978	61.1 mm (2.4 in)
1979	61.5 mm (2.4 in)
1980	71.5 mm (2.8 in)
1981	81.6 mm (3.2 in)
1982	53.8 mm (2.1 in)
1983	76.6 mm (3.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at Trenton A, 1935 to 1983. The record is 33 days in 1936, marked on the chart; the median year is 17 days.

Longest dry spell (CDD) at Trenton A by year
Year	Longest dry spell (CDD)
1935	23 days
1936	33 days
1937	11 days
1938	20 days
1939	11 days
1940	21 days
1941	27 days
1942	17 days
1943	14 days
1944	15 days
1945	11 days
1946	18 days
1947	14 days
1948	20 days
1949	14 days
1950	14 days
1951	14 days
1952	18 days
1953	20 days
1954	18 days
1955	16 days
1956	19 days
1957	23 days
1958	16 days
1959	16 days
1960	15 days
1961	17 days
1962	17 days
1963	23 days
1964	22 days
1965	10 days
1966	15 days
1967	21 days
1968	20 days
1969	22 days
1970	17 days
1971	15 days
1972	15 days
1973	14 days
1974	13 days
1975	15 days
1976	17 days
1977	21 days
1978	24 days
1979	14 days
1980	14 days
1981	15 days
1982	17 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.

Frost Dates and Growing Season

43 years with a frost

Across 43 years with a frost, the median last spring frost at Trenton A falls on 5 May and the median first autumn frost on 4 October, which leaves a median of 153 days between them.

Fitted over all years, the growing season changes by +0.6 days per decade at this station.

Frost dates and growing season at Trenton A
Measure	Median, all years	Earliest period	Recent period (1954 to 1983)	Recent against earliest	Fitted trend
Last spring frost	5 May	n/a	6 May	n/a	+0.4 days per decade
First autumn frost	4 October	n/a	7 October	n/a	+1.0 days per decade
Growing days	153 days	n/a	153 days	n/a	+0.6 days per decade

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.

Rainfall Return Levels

43 years, 1941 to 1983

A day with at least 46.4 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 92.5 mm (3.6 in) of rain is expected about once in 100 years.

Rainfall return levels at Trenton A: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	46.4 mm (1.8 in)
5 years	59.0 mm (2.3 in)
10 years	67.2 mm (2.6 in)
25 years	77.5 mm (3.1 in)
50 years	85.1 mm (3.4 in)	Longer than the 43 years of record
100 years	92.5 mm (3.6 in)	Longer than the 43 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, 43 years of values from 1941 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: 97.0 mm (3.8 in) in 1941; 72.0 mm (2.8 in) in 1977; 71.1 mm (2.8 in) in 1943.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Download the Data

Data for Trenton A standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Trenton 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). Records are computed by this site and are not official.

Data as of 2026-10-17. Last revised 17 October 2026 (2026-10-17).