Hamilton A Weather Records (CA006153194)

Record envelope, standing records and threshold days for Hamilton A (CA006153194), Ontario, Canada, with 53 years of record.

Key Facts for Hamilton A

Hamilton A (CA006153194) is a weather station in Ontario, Canada at 43.17 latitude and -79.93 longitude, 238 m (781 ft) above sea level.
The station reports from 1959 to 2011, 53 years of record.
1,464 records set at Hamilton A still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Ontario, Canada, 43.17 latitude, -79.93 longitude.
Elevation: 238 m (781 ft).
Period of record: 1959 to 2011, 53 years.
Eligible elements: none yet.

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 Hamilton 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 Hamilton A, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	13.3 C (55.9 F)	-27.8 C (-18.0 F)	n/a	n/a
Feb	13.9 C (57.0 F)	-26.1 C (-15.0 F)	n/a	n/a
Mar	23.4 C (74.1 F)	-22.0 C (-7.6 F)	n/a	n/a
Apr	29.4 C (84.9 F)	-12.8 C (9.0 F)	n/a	n/a
May	32.8 C (91.0 F)	-3.9 C (25.0 F)	n/a	n/a
Jun	33.9 C (93.0 F)	1.7 C (35.1 F)	n/a	n/a
Jul	34.4 C (93.9 F)	5.6 C (42.1 F)	n/a	n/a
Aug	35.6 C (96.1 F)	1.1 C (34.0 F)	n/a	n/a
Sep	34.4 C (93.9 F)	-2.2 C (28.0 F)	n/a	n/a
Oct	28.9 C (84.0 F)	-7.8 C (18.0 F)	n/a	n/a
Nov	24.4 C (75.9 F)	-12.8 C (9.0 F)	n/a	n/a
Dec	20.7 C (69.3 F)	-26.8 C (-16.2 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Hamilton A still stand. 1964 holds the most, with 86.

Standing records at Hamilton A by the year they were set
Year set	Standing records
1959	12
1960	46
1961	52
1962	65
1963	74
1964	86
1965	86
1966	77
1967	75
1968	54
1969	47
1970	49
1971	54
1972	45
1973	66
1974	53
1975	60
1976	81
1977	57
1978	49
1979	69
1980	47
1981	52
1982	55
1983	53

Wettest Day of Each Month

Aug: 90.8 mm (3.6 in)

The wettest day on record for each calendar month at Hamilton A. The most was 90.8 mm (3.6 in) on 8 August 1981.

Record daily precipitation for each month at Hamilton A
Month	Record daily precipitation (mm)	Date
Jan	44.6 mm (1.8 in)	31 January 1982
Feb	25.4 mm (1.0 in)	25 February 1965
Mar	35.1 mm (1.4 in)	17 March 1973
Apr	44.7 mm (1.8 in)	25 April 1976
May	39.9 mm (1.6 in)	18 May 1969
Jun	54.4 mm (2.1 in)	25 June 1968
Jul	63.6 mm (2.5 in)	20 July 1981
Aug	90.8 mm (3.6 in)	8 August 1981
Sep	38.8 mm (1.5 in)	14 September 1979
Oct	54.9 mm (2.2 in)	29 October 1973
Nov	53.6 mm (2.1 in)	9 November 1962
Dec	42.9 mm (1.7 in)	12 December 1972

Period of Record Coverage

1959 to 1983

25 years of record at Hamilton A, 1959 to 1983. 5 years have data for under 90 percent of days and are left out of rankings: 1959, 1961, 1963, 1967, 1970.

Days with data per year at Hamilton A
Year	Days with data	Share of year	Complete
1959	55	15%	No
1960	357	98%	Yes
1961	288	79%	No
1962	350	96%	Yes
1963	294	81%	No
1964	353	96%	Yes
1965	357	98%	Yes
1966	349	96%	Yes
1967	321	88%	No
1968	357	98%	Yes
1969	361	99%	Yes
1970	306	84%	No
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	366	100%	Yes
1981	365	100%	Yes
1982	365	100%	Yes
1983	365	100%	Yes

Latest Records

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

Climate Trend

19 complete years, 1960 to 1983

One stripe for each of 19 complete years at Hamilton A, 1960 to 1983. Blue stripes are years cooler than the station's own mean of 7.4 C (45.4 F); red stripes are warmer. The coolest year was 1978, at 6.5 C (43.7 F), and the warmest was 1973, at 8.3 C (47.0 F). The strongest colour marks a difference of 1.0 C (1.8 F).

Annual mean temperature at Hamilton A as warming stripes, 1960 to 1983
Year	Annual mean temperature	Difference from the station mean
1960	7.4 C	-0.07 C
1962	7.2 C	-0.20 C
1964	7.8 C	+0.35 C
1965	7.1 C	-0.28 C
1966	7.4 C	-0.04 C
1969	7.7 C	+0.24 C
1971	7.9 C	+0.52 C
1972	6.8 C	-0.65 C
1973	8.3 C	+0.92 C
1974	7.4 C	-0.01 C
1975	8.2 C	+0.73 C
1976	6.8 C	-0.67 C
1977	7.6 C	+0.13 C
1978	6.5 C	-0.90 C
1979	7.2 C	-0.25 C
1980	7.0 C	-0.46 C
1981	7.6 C	+0.16 C
1982	7.3 C	-0.14 C
1983	8.1 C	+0.70 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

1959 to 1983

Yearly extremes at Hamilton A: 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)	1973	32.2 C (90.0 F)	25
Coldest night (TNn)	-27.8 C (-18.0 F)	1976	-23.3 C (-9.9 F)	25
Wettest day (Rx1day)	90.8 mm (3.6 in)	1981	39.9 mm (1.6 in)	25
Wettest five days (Rx5day)	116.6 mm (4.6 in)	1983	67.3 mm (2.6 in)	25
Longest dry spell (CDD)	31 days	1963	17 days	25

Hottest day (TXx)

The hottest day of the year at Hamilton A, 1959 to 1983. The record is 35.6 C (96.1 F) in 1973, marked on the chart; the median year is 32.2 C (90.0 F).

Hottest day (TXx) at Hamilton A by year
Year	Hottest day (TXx)
1959	18.9 C (66.0 F)
1960	32.2 C (90.0 F)
1961	31.1 C (88.0 F)
1962	32.8 C (91.0 F)
1963	32.8 C (91.0 F)
1964	33.9 C (93.0 F)
1965	33.3 C (91.9 F)
1966	34.4 C (93.9 F)
1967	31.7 C (89.1 F)
1968	32.2 C (90.0 F)
1969	33.3 C (91.9 F)
1970	31.7 C (89.1 F)
1971	32.8 C (91.0 F)
1972	32.2 C (90.0 F)
1973	35.6 C (96.1 F)
1974	32.2 C (90.0 F)
1975	33.3 C (91.9 F)
1976	31.1 C (88.0 F)
1977	33.2 C (91.8 F)
1978	33.6 C (92.5 F)
1979	31.0 C (87.8 F)
1980	31.4 C (88.5 F)
1981	32.2 C (90.0 F)
1982	30.6 C (87.1 F)
1983	34.4 C (93.9 F)

Coldest night (TNn)

The coldest night of the year at Hamilton A, 1959 to 1983. The record is -27.8 C (-18.0 F) in 1976, marked on the chart; the median year is -23.3 C (-9.9 F).

Coldest night (TNn) at Hamilton A by year
Year	Coldest night (TNn)
1959	-20.0 C (-4.0 F)
1960	-20.6 C (-5.1 F)
1961	-23.9 C (-11.0 F)
1962	-25.6 C (-14.1 F)
1963	-25.0 C (-13.0 F)
1964	-22.8 C (-9.0 F)
1965	-26.1 C (-15.0 F)
1966	-24.4 C (-11.9 F)
1967	-23.3 C (-9.9 F)
1968	-22.8 C (-9.0 F)
1969	-20.0 C (-4.0 F)
1970	-20.0 C (-4.0 F)
1971	-22.2 C (-8.0 F)
1972	-21.1 C (-6.0 F)
1973	-23.3 C (-9.9 F)
1974	-21.1 C (-6.0 F)
1975	-20.0 C (-4.0 F)
1976	-27.8 C (-18.0 F)
1977	-24.7 C (-12.5 F)
1978	-22.3 C (-8.1 F)
1979	-25.5 C (-13.9 F)
1980	-26.8 C (-16.2 F)
1981	-26.6 C (-15.9 F)
1982	-24.8 C (-12.6 F)
1983	-19.4 C (-2.9 F)

Wettest day (Rx1day)

The wettest day of the year at Hamilton A, 1959 to 1983. The record is 90.8 mm (3.6 in) in 1981, marked on the chart; the median year is 39.9 mm (1.6 in).

Wettest day (Rx1day) at Hamilton A by year
Year	Wettest day (Rx1day)
1959	19.6 mm (0.8 in)
1960	45.2 mm (1.8 in)
1961	29.7 mm (1.2 in)
1962	53.6 mm (2.1 in)
1963	29.7 mm (1.2 in)
1964	52.1 mm (2.1 in)
1965	39.4 mm (1.6 in)
1966	43.2 mm (1.7 in)
1967	39.9 mm (1.6 in)
1968	54.4 mm (2.1 in)
1969	39.9 mm (1.6 in)
1970	28.2 mm (1.1 in)
1971	29.7 mm (1.2 in)
1972	90.7 mm (3.6 in)
1973	54.9 mm (2.2 in)
1974	33.0 mm (1.3 in)
1975	46.5 mm (1.8 in)
1976	44.7 mm (1.8 in)
1977	35.6 mm (1.4 in)
1978	34.6 mm (1.4 in)
1979	38.8 mm (1.5 in)
1980	32.9 mm (1.3 in)
1981	90.8 mm (3.6 in)
1982	52.4 mm (2.1 in)
1983	49.0 mm (1.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Hamilton A, 1959 to 1983. The record is 116.6 mm (4.6 in) in 1983, marked on the chart; the median year is 67.3 mm (2.6 in).

Wettest five days (Rx5day) at Hamilton A by year
Year	Wettest five days (Rx5day)
1959	38.9 mm (1.5 in)
1960	69.8 mm (2.7 in)
1961	47.7 mm (1.9 in)
1962	71.8 mm (2.8 in)
1963	34.8 mm (1.4 in)
1964	80.5 mm (3.2 in)
1965	67.8 mm (2.7 in)
1966	67.3 mm (2.6 in)
1967	51.8 mm (2.0 in)
1968	60.0 mm (2.4 in)
1969	48.5 mm (1.9 in)
1970	49.7 mm (2.0 in)
1971	35.3 mm (1.4 in)
1972	96.8 mm (3.8 in)
1973	106.9 mm (4.2 in)
1974	62.6 mm (2.5 in)
1975	60.2 mm (2.4 in)
1976	82.6 mm (3.3 in)
1977	67.1 mm (2.6 in)
1978	75.2 mm (3.0 in)
1979	87.4 mm (3.4 in)
1980	56.0 mm (2.2 in)
1981	115.8 mm (4.6 in)
1982	69.5 mm (2.7 in)
1983	116.6 mm (4.6 in)

Longest dry spell (CDD)

The longest dry spell of the year at Hamilton A, 1959 to 1983. The record is 31 days in 1963, marked on the chart; the median year is 17 days.

Longest dry spell (CDD) at Hamilton A by year
Year	Longest dry spell (CDD)
1959	8 days
1960	25 days
1961	28 days
1962	18 days
1963	31 days
1964	18 days
1965	15 days
1966	15 days
1967	21 days
1968	17 days
1969	29 days
1970	13 days
1971	16 days
1972	16 days
1973	15 days
1974	13 days
1975	18 days
1976	17 days
1977	16 days
1978	17 days
1979	16 days
1980	17 days
1981	11 days
1982	16 days
1983	20 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.

Download the Data

Data for Hamilton A standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Hamilton 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-14. Last revised 14 October 2026 (2026-10-14).