Richmond Hill Weather Records (CA006157012)

Record envelope, standing records and threshold days for Richmond Hill (CA006157012), Ontario, Canada, with 56 years of record.

Key Facts for Richmond Hill

Richmond Hill (CA006157012) is a weather station in Ontario, Canada at 43.88 latitude and -79.45 longitude, 240 m (787 ft) above sea level.
The station reports from 1959 to 2014, 56 years of record.
1,464 records set at Richmond Hill 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, 43.88 latitude, -79.45 longitude.
Elevation: 240 m (787 ft).
Period of record: 1959 to 2014, 56 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 Richmond Hill. 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 Richmond Hill, 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)	-32.5 C (-26.5 F)	n/a	n/a
Feb	12.8 C (55.0 F)	-29.0 C (-20.2 F)	n/a	n/a
Mar	23.3 C (73.9 F)	-24.0 C (-11.2 F)	n/a	n/a
Apr	28.9 C (84.0 F)	-15.0 C (5.0 F)	n/a	n/a
May	32.2 C (90.0 F)	-5.6 C (21.9 F)	n/a	n/a
Jun	34.4 C (93.9 F)	0.6 C (33.1 F)	n/a	n/a
Jul	36.1 C (97.0 F)	4.4 C (39.9 F)	n/a	n/a
Aug	36.1 C (97.0 F)	3.0 C (37.4 F)	n/a	n/a
Sep	34.4 C (93.9 F)	-3.3 C (26.1 F)	n/a	n/a
Oct	29.4 C (84.9 F)	-7.8 C (18.0 F)	n/a	n/a
Nov	23.3 C (73.9 F)	-13.9 C (7.0 F)	n/a	n/a
Dec	20.0 C (68.0 F)	-30.0 C (-22.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Richmond Hill still stand. 1965 holds the most, with 83.

Standing records at Richmond Hill by the year they were set
Year set	Standing records
1959	52
1960	45
1961	49
1962	59
1963	80
1964	77
1965	83
1966	73
1967	79
1968	59
1969	38
1970	46
1971	36
1972	52
1973	73
1974	48
1975	59
1976	75
1977	63
1978	43
1979	71
1980	41
1981	55
1982	49
1983	59

Wettest Day of Each Month

Jul: 87.9 mm (3.5 in)

The wettest day on record for each calendar month at Richmond Hill. The most was 87.9 mm (3.5 in) on 26 July 1971.

Record daily precipitation for each month at Richmond Hill
Month	Record daily precipitation (mm)	Date
Jan	46.2 mm (1.8 in)	14 January 1968
Feb	36.3 mm (1.4 in)	10 February 1981
Mar	34.8 mm (1.4 in)	4 March 1974
Apr	30.6 mm (1.2 in)	14 April 1980
May	47.0 mm (1.9 in)	24 May 1977
Jun	42.7 mm (1.7 in)	10 June 1967
Jul	87.9 mm (3.5 in)	26 July 1971
Aug	51.8 mm (2.0 in)	23 August 1972
Sep	44.5 mm (1.8 in)	5 September 1968
Oct	34.0 mm (1.3 in)	17 October 1967
Nov	46.2 mm (1.8 in)	9 November 1962
Dec	32.5 mm (1.3 in)	12 December 1972

Period of Record Coverage

1959 to 1983

25 years of record at Richmond Hill, 1959 to 1983. 1 years have data for under 90 percent of days and are left out of rankings: 1959.

Days with data per year at Richmond Hill
Year	Days with data	Share of year	Complete
1959	214	59%	No
1960	366	100%	Yes
1961	365	100%	Yes
1962	365	100%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	362	99%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	335	92%	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	364	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

23 complete years, 1960 to 1983

One stripe for each of 23 complete years at Richmond Hill, 1960 to 1983. Blue stripes are years cooler than the station's own mean of 7.0 C (44.6 F); red stripes are warmer. The coolest year was 1972, at 6.3 C (43.4 F), and the warmest was 1973, at 8.1 C (46.6 F). The strongest colour marks a difference of 1.1 C (2.0 F).

Annual mean temperature at Richmond Hill as warming stripes, 1960 to 1983
Year	Annual mean temperature	Difference from the station mean
1960	6.9 C	-0.11 C
1961	7.4 C	+0.36 C
1962	6.9 C	-0.12 C
1963	6.5 C	-0.48 C
1964	7.3 C	+0.24 C
1965	6.7 C	-0.37 C
1966	7.1 C	+0.06 C
1967	6.7 C	-0.37 C
1968	6.9 C	-0.09 C
1969	7.2 C	+0.16 C
1970	7.0 C	-0.04 C
1972	6.3 C	-0.70 C
1973	8.1 C	+1.09 C
1974	7.0 C	+0.01 C
1975	8.0 C	+0.96 C
1976	6.5 C	-0.57 C
1977	7.2 C	+0.20 C
1978	6.4 C	-0.60 C
1979	6.9 C	-0.16 C
1980	6.6 C	-0.47 C
1981	7.2 C	+0.21 C
1982	7.0 C	-0.04 C
1983	7.8 C	+0.74 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 Richmond Hill: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	36.1 C (97.0 F)	1975	33.3 C (91.9 F)	25
Coldest night (TNn)	-32.5 C (-26.5 F)	1981	-25.0 C (-13.0 F)	25
Wettest day (Rx1day)	87.9 mm (3.5 in)	1971	34.3 mm (1.4 in)	25
Wettest five days (Rx5day)	97.8 mm (3.9 in)	1971	59.9 mm (2.4 in)	25
Longest dry spell (CDD)	31 days	1963	16 days	25

Hottest day (TXx)

The hottest day of the year at Richmond Hill, 1959 to 1983. The record is 36.1 C (97.0 F) in 1975, marked on the chart; the median year is 33.3 C (91.9 F).

Hottest day (TXx) at Richmond Hill by year
Year	Hottest day (TXx)
1959	33.9 C (93.0 F)
1960	32.2 C (90.0 F)
1961	32.8 C (91.0 F)
1962	32.2 C (90.0 F)
1963	34.4 C (93.9 F)
1964	34.4 C (93.9 F)
1965	33.9 C (93.0 F)
1966	35.0 C (95.0 F)
1967	31.7 C (89.1 F)
1968	33.9 C (93.0 F)
1969	33.3 C (91.9 F)
1970	31.7 C (89.1 F)
1971	32.8 C (91.0 F)
1972	33.3 C (91.9 F)
1973	34.4 C (93.9 F)
1974	33.3 C (91.9 F)
1975	36.1 C (97.0 F)
1976	31.7 C (89.1 F)
1977	34.5 C (94.1 F)
1978	35.0 C (95.0 F)
1979	31.0 C (87.8 F)
1980	31.5 C (88.7 F)
1981	32.5 C (90.5 F)
1982	31.5 C (88.7 F)
1983	34.0 C (93.2 F)

Coldest night (TNn)

The coldest night of the year at Richmond Hill, 1959 to 1983. The record is -32.5 C (-26.5 F) in 1981, marked on the chart; the median year is -25.0 C (-13.0 F).

Coldest night (TNn) at Richmond Hill by year
Year	Coldest night (TNn)
1959	-16.7 C (1.9 F)
1960	-22.8 C (-9.0 F)
1961	-25.0 C (-13.0 F)
1962	-25.0 C (-13.0 F)
1963	-24.4 C (-11.9 F)
1964	-23.3 C (-9.9 F)
1965	-25.0 C (-13.0 F)
1966	-23.3 C (-9.9 F)
1967	-27.8 C (-18.0 F)
1968	-26.7 C (-16.1 F)
1969	-21.7 C (-7.1 F)
1970	-26.7 C (-16.1 F)
1971	-26.1 C (-15.0 F)
1972	-23.9 C (-11.0 F)
1973	-23.3 C (-9.9 F)
1974	-21.7 C (-7.1 F)
1975	-23.3 C (-9.9 F)
1976	-31.1 C (-24.0 F)
1977	-27.8 C (-18.0 F)
1978	-22.0 C (-7.6 F)
1979	-29.0 C (-20.2 F)
1980	-30.0 C (-22.0 F)
1981	-32.5 C (-26.5 F)
1982	-29.0 C (-20.2 F)
1983	-23.0 C (-9.4 F)

Wettest day (Rx1day)

The wettest day of the year at Richmond Hill, 1959 to 1983. The record is 87.9 mm (3.5 in) in 1971, marked on the chart; the median year is 34.3 mm (1.4 in).

Wettest day (Rx1day) at Richmond Hill by year
Year	Wettest day (Rx1day)
1959	30.5 mm (1.2 in)
1960	40.1 mm (1.6 in)
1961	25.4 mm (1.0 in)
1962	46.2 mm (1.8 in)
1963	33.0 mm (1.3 in)
1964	51.8 mm (2.0 in)
1965	30.7 mm (1.2 in)
1966	30.0 mm (1.2 in)
1967	49.0 mm (1.9 in)
1968	46.2 mm (1.8 in)
1969	36.1 mm (1.4 in)
1970	24.9 mm (1.0 in)
1971	87.9 mm (3.5 in)
1972	51.8 mm (2.0 in)
1973	25.7 mm (1.0 in)
1974	34.8 mm (1.4 in)
1975	33.8 mm (1.3 in)
1976	34.3 mm (1.4 in)
1977	47.0 mm (1.9 in)
1978	32.2 mm (1.3 in)
1979	33.2 mm (1.3 in)
1980	63.2 mm (2.5 in)
1981	41.0 mm (1.6 in)
1982	34.2 mm (1.3 in)
1983	31.4 mm (1.2 in)

Wettest five days (Rx5day)

The wettest five days of the year at Richmond Hill, 1959 to 1983. The record is 97.8 mm (3.9 in) in 1971, marked on the chart; the median year is 59.9 mm (2.4 in).

Wettest five days (Rx5day) at Richmond Hill by year
Year	Wettest five days (Rx5day)
1959	55.5 mm (2.2 in)
1960	92.9 mm (3.7 in)
1961	37.8 mm (1.5 in)
1962	72.1 mm (2.8 in)
1963	48.0 mm (1.9 in)
1964	83.4 mm (3.3 in)
1965	57.6 mm (2.3 in)
1966	65.7 mm (2.6 in)
1967	65.6 mm (2.6 in)
1968	65.3 mm (2.6 in)
1969	47.0 mm (1.9 in)
1970	45.2 mm (1.8 in)
1971	97.8 mm (3.9 in)
1972	58.6 mm (2.3 in)
1973	59.9 mm (2.4 in)
1974	55.4 mm (2.2 in)
1975	46.0 mm (1.8 in)
1976	73.7 mm (2.9 in)
1977	57.6 mm (2.3 in)
1978	54.0 mm (2.1 in)
1979	62.6 mm (2.5 in)
1980	77.0 mm (3.0 in)
1981	59.0 mm (2.3 in)
1982	65.2 mm (2.6 in)
1983	60.8 mm (2.4 in)

Longest dry spell (CDD)

The longest dry spell of the year at Richmond Hill, 1959 to 1983. The record is 31 days in 1963, marked on the chart; the median year is 16 days.

Longest dry spell (CDD) at Richmond Hill by year
Year	Longest dry spell (CDD)
1959	13 days
1960	13 days
1961	17 days
1962	23 days
1963	31 days
1964	14 days
1965	17 days
1966	19 days
1967	20 days
1968	12 days
1969	24 days
1970	16 days
1971	15 days
1972	14 days
1973	15 days
1974	16 days
1975	13 days
1976	17 days
1977	22 days
1978	17 days
1979	16 days
1980	17 days
1981	12 days
1982	16 days
1983	16 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 Richmond Hill falls on 7 May and the median first autumn frost on 6 October, which leaves a median of 156 days between them.

Frost dates and growing season at Richmond Hill
Measure	Median, all years	Earliest period	Recent period (1960 to 1983)	Recent against earliest	Fitted trend
Last spring frost	7 May	n/a	7 May	n/a	n/a
First autumn frost	6 October	n/a	6 October	n/a	n/a
Growing days	156 days	n/a	156 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 Richmond Hill standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Richmond Hill 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-13. Last revised 13 October 2026 (2026-10-13).