Port Dalhousie Weather Records (CA006136626)

Record envelope, standing records and threshold days for Port Dalhousie (CA006136626), Ontario, Canada, with 123 years of record.

Key Facts for Port Dalhousie

Port Dalhousie (CA006136626) is a weather station in Ontario, Canada at 43.18 latitude and -79.27 longitude, 91 m (299 ft) above sea level.
The station reports from 1874 to 1996, 123 years of record.
1,464 records set at Port Dalhousie still stand.
Records are tracked for prcp, snow: an element needs 30 years of data to be eligible.
Port Dalhousie set a daily record precipitation of 11.0 mm (0.4 in) on 28 December 1983.

About the Station

Location: Ontario, Canada, 43.18 latitude, -79.27 longitude.
Elevation: 91 m (299 ft).
Period of record: 1874 to 1996, 123 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 Port Dalhousie. 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 Port Dalhousie, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	16.1 C (61.0 F)	-24.0 C (-11.2 F)	n/a	n/a
Feb	15.0 C (59.0 F)	-24.5 C (-12.1 F)	n/a	n/a
Mar	24.4 C (75.9 F)	-16.7 C (1.9 F)	n/a	n/a
Apr	29.5 C (85.1 F)	-8.5 C (16.7 F)	n/a	n/a
May	33.3 C (91.9 F)	-2.8 C (27.0 F)	n/a	n/a
Jun	34.4 C (93.9 F)	2.2 C (36.0 F)	n/a	n/a
Jul	35.6 C (96.1 F)	6.7 C (44.1 F)	n/a	n/a
Aug	35.6 C (96.1 F)	3.9 C (39.0 F)	n/a	n/a
Sep	35.6 C (96.1 F)	0.0 C (32.0 F)	n/a	n/a
Oct	29.4 C (84.9 F)	-6.1 C (21.0 F)	n/a	n/a
Nov	26.7 C (80.1 F)	-13.3 C (8.1 F)	n/a	n/a
Dec	22.0 C (71.6 F)	-23.5 C (-10.3 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Port Dalhousie still stand. 1959 holds the most, with 82.

Standing records at Port Dalhousie by the year they were set
Year set	Standing records
1957	40
1958	37
1959	82
1960	47
1961	53
1962	59
1963	72
1964	67
1965	56
1966	64
1967	69
1968	38
1969	39
1970	48
1971	38
1972	46
1973	66
1974	55
1975	44
1976	71
1977	61
1978	49
1979	62
1980	46
1981	52
1982	54
1983	49

Wettest Day of Each Month

Aug: 97.8 mm (3.9 in)

The wettest day on record for each calendar month at Port Dalhousie. The most was 97.8 mm (3.9 in) on 6 August 1962.

Record daily precipitation for each month at Port Dalhousie
Month	Record daily precipitation (mm)	Date
Jan	34.8 mm (1.4 in)	11 January 1878
Feb	41.9 mm (1.6 in)	25 February 1961
Mar	36.6 mm (1.4 in)	27 March 1878
Apr	41.9 mm (1.6 in)	18 April 1969
May	58.4 mm (2.3 in)	6 May 1976
Jun	82.6 mm (3.3 in)	11 June 1970
Jul	57.7 mm (2.3 in)	23 July 1962
Aug	97.8 mm (3.9 in)	6 August 1962
Sep	50.0 mm (2.0 in)	5 September 1918
Oct	36.8 mm (1.4 in)	23 October 1912
Nov	40.6 mm (1.6 in)	9 November 1962
Dec	32.8 mm (1.3 in)	10 December 1969

Period of Record Coverage

1957 to 1983

27 years of record at Port Dalhousie, 1957 to 1983. 2 years have data for under 90 percent of days and are left out of rankings: 1957, 1965.

Days with data per year at Port Dalhousie
Year	Days with data	Share of year	Complete
1957	243	67%	No
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	299	82%	No
1966	365	100%	Yes
1967	365	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	363	99%	Yes
1982	365	100%	Yes
1983	365	100%	Yes

Latest Records

Latest records at Port Dalhousie
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
28 December 1983	Port Dalhousie, CA	daily rain	11.0 mm (0.4 in)	1.9 mm (0.07 in)	14 years	17 of 100 (Routine)
28 December 1983	Port Dalhousie, CA	daily snowfall	9.0 cm (3.5 in)	0.4 cm (0.2 in)	1 year	11 of 100 (Routine)
11 December 1983	Port Dalhousie, CA	daily rain	17.2 mm (0.7 in)	5.3 mm (0.21 in)	24 years	20 of 100 (Routine)
11 November 1983	Port Dalhousie, CA	daily snowfall	6.0 cm (2.4 in)	6.0 cm (2.4 in)	108 years	54 of 100 (Notable)
11 November 1983	Port Dalhousie, CA	daily rain	14.0 mm (0.6 in)	2.8 mm (0.11 in)	16 years	18 of 100 (Routine)
5 October 1983	Port Dalhousie, CA	daily rain	24.0 mm (0.9 in)	1.6 mm (0.06 in)	72 years	20 of 100 (Routine)
6 September 1983	Port Dalhousie, CA	daily rain	14.2 mm (0.6 in)	3.0 mm (0.12 in)	72 years	20 of 100 (Routine)
30 August 1983	Port Dalhousie, CA	daily rain	14.4 mm (0.6 in)	0.7 mm (0.03 in)	64 years	20 of 100 (Routine)
8 August 1983	Port Dalhousie, CA	daily rain	21.0 mm (0.8 in)	6.5 mm (0.26 in)	70 years	20 of 100 (Routine)
4 July 1983	Port Dalhousie, CA	daily rain	17.8 mm (0.7 in)	4.1 mm (0.16 in)	104 years	20 of 100 (Routine)
27 June 1983	Port Dalhousie, CA	daily rain	37.0 mm (1.5 in)	4.5 mm (0.18 in)	64 years	33 of 100 (Routine)
29 May 1983	Port Dalhousie, CA	daily rain	15.0 mm (0.6 in)	1.0 mm (0.04 in)	65 years	20 of 100 (Routine)
1 May 1983	Port Dalhousie, CA	daily rain	17.6 mm (0.7 in)	0.8 mm (0.03 in)	107 years	20 of 100 (Routine)
9 April 1983	Port Dalhousie, CA	daily rain	13.8 mm (0.5 in)	0.6 mm (0.02 in)	61 years	20 of 100 (Routine)
21 March 1983	Port Dalhousie, CA	daily snowfall	12.0 cm (4.7 in)	6.2 cm (2.4 in)	66 years	44 of 100 (Notable)
21 March 1983	Port Dalhousie, CA	daily rain	12.0 mm (0.5 in)	0.1 mm (0.00 in)	16 years	15 of 100 (Routine)
18 March 1983	Port Dalhousie, CA	daily rain	25.0 mm (1.0 in)	11.5 mm (0.5 in)	64 years	49 of 100 (Notable)
2 February 1983	Port Dalhousie, CA	daily rain	21.8 mm (0.9 in)	7.1 mm (0.28 in)	12 years	20 of 100 (Routine)
19 December 1982	Port Dalhousie, CA	daily snowfall	9.0 cm (3.5 in)	0.1 cm (0.0 in)	8 years	12 of 100 (Routine)
15 December 1982	Port Dalhousie, CA	daily rain	24.4 mm (1.0 in)	7.9 mm (0.31 in)	9 years	20 of 100 (Routine)

Climate Trend

25 complete years, 1958 to 1983

One stripe for each of 25 complete years at Port Dalhousie, 1958 to 1983. Blue stripes are years cooler than the station's own mean of 8.8 C (47.9 F); red stripes are warmer. The coolest year was 1963, at 8.1 C (46.7 F), and the warmest was 1973, at 9.9 C (49.8 F). The strongest colour marks a difference of 1.1 C (2.0 F).

Annual mean temperature at Port Dalhousie as warming stripes, 1958 to 1983
Year	Annual mean temperature	Difference from the station mean
1958	8.6 C	-0.17 C
1959	9.4 C	+0.55 C
1960	8.7 C	-0.12 C
1961	9.2 C	+0.38 C
1962	8.6 C	-0.19 C
1963	8.1 C	-0.67 C
1964	8.8 C	+0.02 C
1966	8.7 C	-0.10 C
1967	8.5 C	-0.29 C
1968	8.7 C	-0.11 C
1969	8.7 C	-0.13 C
1970	8.9 C	+0.05 C
1971	9.1 C	+0.28 C
1972	8.2 C	-0.63 C
1973	9.9 C	+1.06 C
1974	8.9 C	+0.05 C
1975	9.7 C	+0.91 C
1976	8.2 C	-0.62 C
1977	8.8 C	-0.06 C
1978	8.2 C	-0.61 C
1979	8.7 C	-0.16 C
1980	8.6 C	-0.19 C
1981	9.0 C	+0.17 C
1982	8.7 C	-0.12 C
1983	9.6 C	+0.78 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

1874 to 1983

Yearly extremes at Port Dalhousie: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	35.6 C (96.1 F)	1966	33.3 C (91.9 F)	27
Coldest night (TNn)	-24.5 C (-12.1 F)	1979	-19.4 C (-2.9 F)	27
Wettest day (Rx1day)	97.8 mm (3.9 in)	1962	37.3 mm (1.5 in)	44
Wettest five days (Rx5day)	107.6 mm (4.2 in)	1917	64.1 mm (2.5 in)	44
Longest dry spell (CDD)	31 days	1963	17 days	44

Hottest day (TXx)

The hottest day of the year at Port Dalhousie, 1874 to 1983. The record is 35.6 C (96.1 F) in 1966, marked on the chart; the median year is 33.3 C (91.9 F).

Hottest day (TXx) at Port Dalhousie by year
Year	Hottest day (TXx)
1874	n/a
1875	n/a
1876	n/a
1878	n/a
1879	n/a
1910	n/a
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1957	34.4 C (93.9 F)
1958	32.2 C (90.0 F)
1959	34.4 C (93.9 F)
1960	32.8 C (91.0 F)
1961	32.8 C (91.0 F)
1962	33.3 C (91.9 F)
1963	34.4 C (93.9 F)
1964	33.9 C (93.0 F)
1965	33.3 C (91.9 F)
1966	35.6 C (96.1 F)
1967	31.7 C (89.1 F)
1968	33.9 C (93.0 F)
1969	33.9 C (93.0 F)
1970	32.2 C (90.0 F)
1971	32.8 C (91.0 F)
1972	33.3 C (91.9 F)
1973	35.6 C (96.1 F)
1974	33.9 C (93.0 F)
1975	35.6 C (96.1 F)
1976	31.7 C (89.1 F)
1977	35.5 C (95.9 F)
1978	35.5 C (95.9 F)
1979	32.0 C (89.6 F)
1980	32.5 C (90.5 F)
1981	33.0 C (91.4 F)
1982	33.0 C (91.4 F)
1983	34.0 C (93.2 F)

Coldest night (TNn)

The coldest night of the year at Port Dalhousie, 1874 to 1983. The record is -24.5 C (-12.1 F) in 1979, marked on the chart; the median year is -19.4 C (-2.9 F).

Coldest night (TNn) at Port Dalhousie by year
Year	Coldest night (TNn)
1874	n/a
1875	n/a
1876	n/a
1878	n/a
1879	n/a
1910	n/a
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1957	-12.8 C (9.0 F)
1958	-18.9 C (-2.0 F)
1959	-18.9 C (-2.0 F)
1960	-18.3 C (-0.9 F)
1961	-18.9 C (-2.0 F)
1962	-19.4 C (-2.9 F)
1963	-22.2 C (-8.0 F)
1964	-16.7 C (1.9 F)
1965	-22.8 C (-9.0 F)
1966	-20.0 C (-4.0 F)
1967	-20.6 C (-5.1 F)
1968	-21.1 C (-6.0 F)
1969	-17.8 C (0.0 F)
1970	-20.0 C (-4.0 F)
1971	-19.4 C (-2.9 F)
1972	-19.4 C (-2.9 F)
1973	-16.7 C (1.9 F)
1974	-18.9 C (-2.0 F)
1975	-15.6 C (3.9 F)
1976	-22.2 C (-8.0 F)
1977	-20.0 C (-4.0 F)
1978	-16.5 C (2.3 F)
1979	-24.5 C (-12.1 F)
1980	-23.5 C (-10.3 F)
1981	-21.5 C (-6.7 F)
1982	-24.0 C (-11.2 F)
1983	-16.5 C (2.3 F)

Wettest day (Rx1day)

The wettest day of the year at Port Dalhousie, 1874 to 1983. The record is 97.8 mm (3.9 in) in 1962, marked on the chart; the median year is 37.3 mm (1.5 in).

Wettest day (Rx1day) at Port Dalhousie by year
Year	Wettest day (Rx1day)
1874	23.6 mm (0.9 in)
1875	32.8 mm (1.3 in)
1876	28.4 mm (1.1 in)
1878	36.6 mm (1.4 in)
1879	23.9 mm (0.9 in)
1910	35.3 mm (1.4 in)
1911	30.7 mm (1.2 in)
1912	37.1 mm (1.5 in)
1913	57.2 mm (2.3 in)
1914	33.3 mm (1.3 in)
1915	65.8 mm (2.6 in)
1916	42.2 mm (1.7 in)
1917	79.2 mm (3.1 in)
1918	70.6 mm (2.8 in)
1919	35.6 mm (1.4 in)
1920	46.5 mm (1.8 in)
1921	38.1 mm (1.5 in)
1957	50.8 mm (2.0 in)
1958	30.5 mm (1.2 in)
1959	36.8 mm (1.4 in)
1960	29.2 mm (1.1 in)
1961	41.9 mm (1.6 in)
1962	97.8 mm (3.9 in)
1963	49.8 mm (2.0 in)
1964	55.9 mm (2.2 in)
1965	26.7 mm (1.1 in)
1966	41.4 mm (1.6 in)
1967	37.3 mm (1.5 in)
1968	73.2 mm (2.9 in)
1969	41.9 mm (1.6 in)
1970	82.6 mm (3.3 in)
1971	53.3 mm (2.1 in)
1972	50.8 mm (2.0 in)
1973	38.9 mm (1.5 in)
1974	27.4 mm (1.1 in)
1975	27.4 mm (1.1 in)
1976	58.4 mm (2.3 in)
1977	35.0 mm (1.4 in)
1978	37.0 mm (1.5 in)
1979	33.4 mm (1.3 in)
1980	37.4 mm (1.5 in)
1981	42.2 mm (1.7 in)
1982	36.8 mm (1.4 in)
1983	37.0 mm (1.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Port Dalhousie, 1874 to 1983. The record is 107.6 mm (4.2 in) in 1917, marked on the chart; the median year is 64.1 mm (2.5 in).

Wettest five days (Rx5day) at Port Dalhousie by year
Year	Wettest five days (Rx5day)
1874	26.2 mm (1.0 in)
1875	46.5 mm (1.8 in)
1876	43.9 mm (1.7 in)
1878	49.5 mm (1.9 in)
1879	23.9 mm (0.9 in)
1910	72.4 mm (2.9 in)
1911	47.4 mm (1.9 in)
1912	62.5 mm (2.5 in)
1913	85.4 mm (3.4 in)
1914	56.2 mm (2.2 in)
1915	69.4 mm (2.7 in)
1916	64.0 mm (2.5 in)
1917	107.6 mm (4.2 in)
1918	90.9 mm (3.6 in)
1919	50.8 mm (2.0 in)
1920	47.3 mm (1.9 in)
1921	55.9 mm (2.2 in)
1957	65.0 mm (2.6 in)
1958	48.6 mm (1.9 in)
1959	64.2 mm (2.5 in)
1960	51.6 mm (2.0 in)
1961	68.5 mm (2.7 in)
1962	103.4 mm (4.1 in)
1963	72.7 mm (2.9 in)
1964	70.1 mm (2.8 in)
1965	37.9 mm (1.5 in)
1966	61.9 mm (2.4 in)
1967	70.3 mm (2.8 in)
1968	79.0 mm (3.1 in)
1969	63.5 mm (2.5 in)
1970	88.4 mm (3.5 in)
1971	68.6 mm (2.7 in)
1972	57.5 mm (2.3 in)
1973	76.2 mm (3.0 in)
1974	57.5 mm (2.3 in)
1975	40.9 mm (1.6 in)
1976	88.9 mm (3.5 in)
1977	87.8 mm (3.5 in)
1978	69.4 mm (2.7 in)
1979	67.6 mm (2.7 in)
1980	42.0 mm (1.7 in)
1981	77.4 mm (3.0 in)
1982	67.6 mm (2.7 in)
1983	54.0 mm (2.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Port Dalhousie, 1874 to 1983. The record is 31 days in 1963, marked on the chart; the median year is 17 days.

Longest dry spell (CDD) at Port Dalhousie by year
Year	Longest dry spell (CDD)
1874	15 days
1875	13 days
1876	18 days
1878	14 days
1879	15 days
1910	17 days
1911	14 days
1912	24 days
1913	17 days
1914	18 days
1915	18 days
1916	12 days
1917	22 days
1918	19 days
1919	26 days
1920	15 days
1921	15 days
1957	23 days
1958	18 days
1959	15 days
1960	13 days
1961	19 days
1962	18 days
1963	31 days
1964	11 days
1965	13 days
1966	17 days
1967	14 days
1968	18 days
1969	22 days
1970	14 days
1971	11 days
1972	14 days
1973	15 days
1974	17 days
1975	18 days
1976	20 days
1977	13 days
1978	17 days
1979	10 days
1980	15 days
1981	11 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

25 years with a frost

Across 25 years with a frost, the median last spring frost at Port Dalhousie falls on 29 April and the median first autumn frost on 19 October, which leaves a median of 174 days between them.

Fitted over all years, the growing season changes by +5.5 days per decade at this station.

Frost dates and growing season at Port Dalhousie
Measure	Median, all years	Earliest period	Recent period (1958 to 1983)	Recent against earliest	Fitted trend
Last spring frost	29 April	n/a	29 April	n/a	-4.4 days per decade
First autumn frost	19 October	n/a	19 October	n/a	+1.0 days per decade
Growing days	174 days	n/a	174 days	n/a	+5.5 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

38 years, 1875 to 1983

A day with at least 40.7 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 120.3 mm (4.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Port Dalhousie: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	40.7 mm (1.6 in)
5 years	54.1 mm (2.1 in)
10 years	65.4 mm (2.6 in)
25 years	83.5 mm (3.3 in)
50 years	100.3 mm (3.9 in)	Longer than the 38 years of record
100 years	120.3 mm (4.7 in)	Longer than the 38 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, 38 years of values from 1875 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: 97.8 mm (3.9 in) in 1962; 82.6 mm (3.3 in) in 1970; 79.2 mm (3.1 in) in 1917.

Download the Data

Data for Port Dalhousie standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Port Dalhousie 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).