Essa Ont Hydro Weather Records (CA006112340)

Record envelope, standing records and threshold days for Essa Ont Hydro (CA006112340), Ontario, Canada, with 44 years of record.

Key Facts for Essa Ont Hydro

Essa Ont Hydro (CA006112340) is a weather station in Ontario, Canada at 44.35 latitude and -79.82 longitude, 216 m (709 ft) above sea level.
The station reports from 1958 to 2001, 44 years of record.
1,464 records set at Essa Ont Hydro 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, 44.35 latitude, -79.82 longitude.
Elevation: 216 m (709 ft).
Period of record: 1958 to 2001, 44 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 Essa 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 Essa Ont Hydro, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	11.7 C (53.1 F)	-36.1 C (-33.0 F)	n/a	n/a
Feb	10.6 C (51.1 F)	-37.5 C (-35.5 F)	n/a	n/a
Mar	23.9 C (75.0 F)	-32.8 C (-27.0 F)	n/a	n/a
Apr	30.0 C (86.0 F)	-21.7 C (-7.1 F)	n/a	n/a
May	35.0 C (95.0 F)	-6.7 C (19.9 F)	n/a	n/a
Jun	35.0 C (95.0 F)	-2.0 C (28.4 F)	n/a	n/a
Jul	35.5 C (95.9 F)	2.8 C (37.0 F)	n/a	n/a
Aug	33.9 C (93.0 F)	0.0 C (32.0 F)	n/a	n/a
Sep	33.9 C (93.0 F)	-3.3 C (26.1 F)	n/a	n/a
Oct	30.6 C (87.1 F)	-11.1 C (12.0 F)	n/a	n/a
Nov	23.9 C (75.0 F)	-19.4 C (-2.9 F)	n/a	n/a
Dec	19.0 C (66.2 F)	-36.0 C (-32.8 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Essa Ont Hydro still stand. 1965 holds the most, with 76.

Standing records at Essa Ont Hydro by the year they were set
Year set	Standing records
1958	24
1959	64
1960	55
1961	59
1962	56
1963	72
1964	66
1965	76
1966	66
1967	72
1968	59
1969	51
1970	49
1971	47
1972	23
1973	63
1974	49
1975	58
1976	70
1977	65
1978	48
1979	69
1980	44
1981	62
1982	44
1983	53

Wettest Day of Each Month

Jul: 91.2 mm (3.6 in)

The wettest day on record for each calendar month at Essa Ont Hydro. The most was 91.2 mm (3.6 in) on 20 July 1980.

Record daily precipitation for each month at Essa Ont Hydro
Month	Record daily precipitation (mm)	Date
Jan	30.0 mm (1.2 in)	6 January 1981
Feb	40.6 mm (1.6 in)	19 February 1960
Mar	33.8 mm (1.3 in)	4 March 1974
Apr	30.0 mm (1.2 in)	17 April 1969
May	41.7 mm (1.6 in)	19 May 1959
Jun	45.2 mm (1.8 in)	21 June 1967
Jul	91.2 mm (3.6 in)	20 July 1980
Aug	72.9 mm (2.9 in)	28 August 1961
Sep	55.9 mm (2.2 in)	17 September 1976
Oct	29.5 mm (1.2 in)	22 October 1972
Nov	35.3 mm (1.4 in)	28 November 1968
Dec	38.5 mm (1.5 in)	27 December 1978

Period of Record Coverage

1958 to 1983

26 years of record at Essa Ont Hydro, 1958 to 1983. 2 years have data for under 90 percent of days and are left out of rankings: 1958, 1972.

Days with data per year at Essa Ont Hydro
Year	Days with data	Share of year	Complete
1958	183	50%	No
1959	365	100%	Yes
1960	334	91%	Yes
1961	363	99%	Yes
1962	365	100%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	361	99%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	244	67%	No
1973	334	92%	Yes
1974	365	100%	Yes
1975	335	92%	Yes
1976	341	93%	Yes
1977	365	100%	Yes
1978	337	92%	Yes
1979	365	100%	Yes
1980	365	100%	Yes
1981	365	100%	Yes
1982	362	99%	Yes
1983	365	100%	Yes

Latest Records

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

Climate Trend

19 complete years, 1959 to 1983

One stripe for each of 19 complete years at Essa Ont Hydro, 1959 to 1983. Blue stripes are years cooler than the station's own mean of 6.2 C (43.1 F); red stripes are warmer. The coolest year was 1963, at 5.5 C (42.0 F), and the warmest was 1983, at 7.0 C (44.6 F). The strongest colour marks a difference of 0.9 C (1.6 F).

Annual mean temperature at Essa Ont Hydro as warming stripes, 1959 to 1983
Year	Annual mean temperature	Difference from the station mean
1959	6.4 C	+0.24 C
1961	6.4 C	+0.22 C
1962	6.0 C	-0.18 C
1963	5.5 C	-0.61 C
1964	6.7 C	+0.58 C
1965	5.7 C	-0.44 C
1966	6.2 C	+0.01 C
1967	5.7 C	-0.50 C
1968	6.1 C	-0.03 C
1969	6.2 C	+0.02 C
1970	6.0 C	-0.17 C
1971	6.4 C	+0.25 C
1974	5.8 C	-0.33 C
1977	6.3 C	+0.14 C
1979	6.3 C	+0.17 C
1980	5.6 C	-0.52 C
1981	6.5 C	+0.31 C
1982	6.2 C	+0.02 C
1983	7.0 C	+0.83 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

1958 to 1983

Yearly extremes at Essa Ont Hydro: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	35.5 C (95.9 F)	1977	33.9 C (93.0 F)	26
Coldest night (TNn)	-37.5 C (-35.5 F)	1979	-33.1 C (-27.7 F)	26
Wettest day (Rx1day)	91.2 mm (3.6 in)	1980	38.6 mm (1.5 in)	26
Wettest five days (Rx5day)	134.1 mm (5.3 in)	1968	63.3 mm (2.5 in)	26
Longest dry spell (CDD)	28 days	1966	17 days	26

Hottest day (TXx)

The hottest day of the year at Essa Ont Hydro, 1958 to 1983. The record is 35.5 C (95.9 F) in 1977, marked on the chart; the median year is 33.9 C (93.0 F).

Hottest day (TXx) at Essa Ont Hydro by year
Year	Hottest day (TXx)
1958	32.2 C (90.0 F)
1959	33.9 C (93.0 F)
1960	33.9 C (93.0 F)
1961	32.2 C (90.0 F)
1962	33.9 C (93.0 F)
1963	35.0 C (95.0 F)
1964	34.4 C (93.9 F)
1965	33.9 C (93.0 F)
1966	34.4 C (93.9 F)
1967	31.1 C (88.0 F)
1968	34.4 C (93.9 F)
1969	35.0 C (95.0 F)
1970	32.2 C (90.0 F)
1971	33.9 C (93.0 F)
1972	29.4 C (84.9 F)
1973	33.9 C (93.0 F)
1974	33.3 C (91.9 F)
1975	35.0 C (95.0 F)
1976	32.8 C (91.0 F)
1977	35.5 C (95.9 F)
1978	35.0 C (95.0 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	35.0 C (95.0 F)

Coldest night (TNn)

The coldest night of the year at Essa Ont Hydro, 1958 to 1983. The record is -37.5 C (-35.5 F) in 1979, marked on the chart; the median year is -33.1 C (-27.7 F).

Coldest night (TNn) at Essa Ont Hydro by year
Year	Coldest night (TNn)
1958	-33.3 C (-27.9 F)
1959	-35.6 C (-32.1 F)
1960	-27.2 C (-17.0 F)
1961	-32.8 C (-27.0 F)
1962	-35.0 C (-31.0 F)
1963	-32.2 C (-26.0 F)
1964	-30.6 C (-23.1 F)
1965	-31.7 C (-25.1 F)
1966	-33.3 C (-27.9 F)
1967	-33.3 C (-27.9 F)
1968	-33.3 C (-27.9 F)
1969	-31.1 C (-24.0 F)
1970	-30.6 C (-23.1 F)
1971	-31.1 C (-24.0 F)
1972	-33.3 C (-27.9 F)
1973	-33.3 C (-27.9 F)
1974	-27.8 C (-18.0 F)
1975	-30.6 C (-23.1 F)
1976	-36.1 C (-33.0 F)
1977	-36.1 C (-33.0 F)
1978	-28.0 C (-18.4 F)
1979	-37.5 C (-35.5 F)
1980	-36.0 C (-32.8 F)
1981	-36.0 C (-32.8 F)
1982	-33.0 C (-27.4 F)
1983	-27.0 C (-16.6 F)

Wettest day (Rx1day)

The wettest day of the year at Essa Ont Hydro, 1958 to 1983. The record is 91.2 mm (3.6 in) in 1980, marked on the chart; the median year is 38.6 mm (1.5 in).

Wettest day (Rx1day) at Essa Ont Hydro by year
Year	Wettest day (Rx1day)
1958	41.7 mm (1.6 in)
1959	41.7 mm (1.6 in)
1960	40.6 mm (1.6 in)
1961	72.9 mm (2.9 in)
1962	34.5 mm (1.4 in)
1963	38.1 mm (1.5 in)
1964	34.0 mm (1.3 in)
1965	35.6 mm (1.4 in)
1966	37.6 mm (1.5 in)
1967	49.8 mm (2.0 in)
1968	61.7 mm (2.4 in)
1969	30.0 mm (1.2 in)
1970	40.6 mm (1.6 in)
1971	22.1 mm (0.9 in)
1972	29.5 mm (1.2 in)
1973	36.3 mm (1.4 in)
1974	55.9 mm (2.2 in)
1975	31.8 mm (1.3 in)
1976	55.9 mm (2.2 in)
1977	52.2 mm (2.1 in)
1978	38.5 mm (1.5 in)
1979	28.0 mm (1.1 in)
1980	91.2 mm (3.6 in)
1981	44.2 mm (1.7 in)
1982	38.6 mm (1.5 in)
1983	25.0 mm (1.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Essa Ont Hydro, 1958 to 1983. The record is 134.1 mm (5.3 in) in 1968, marked on the chart; the median year is 63.3 mm (2.5 in).

Wettest five days (Rx5day) at Essa Ont Hydro by year
Year	Wettest five days (Rx5day)
1958	48.3 mm (1.9 in)
1959	66.6 mm (2.6 in)
1960	98.8 mm (3.9 in)
1961	111.7 mm (4.4 in)
1962	56.1 mm (2.2 in)
1963	49.5 mm (1.9 in)
1964	48.2 mm (1.9 in)
1965	67.3 mm (2.6 in)
1966	83.1 mm (3.3 in)
1967	74.2 mm (2.9 in)
1968	134.1 mm (5.3 in)
1969	45.8 mm (1.8 in)
1970	62.7 mm (2.5 in)
1971	44.5 mm (1.8 in)
1972	45.0 mm (1.8 in)
1973	58.7 mm (2.3 in)
1974	63.0 mm (2.5 in)
1975	55.4 mm (2.2 in)
1976	83.9 mm (3.3 in)
1977	63.8 mm (2.5 in)
1978	63.6 mm (2.5 in)
1979	58.6 mm (2.3 in)
1980	102.8 mm (4.0 in)
1981	76.4 mm (3.0 in)
1982	57.8 mm (2.3 in)
1983	64.1 mm (2.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Essa Ont Hydro, 1958 to 1983. The record is 28 days in 1966, marked on the chart; the median year is 17 days.

Longest dry spell (CDD) at Essa Ont Hydro by year
Year	Longest dry spell (CDD)
1958	18 days
1959	14 days
1960	13 days
1961	19 days
1962	22 days
1963	21 days
1964	13 days
1965	15 days
1966	28 days
1967	20 days
1968	18 days
1969	24 days
1970	11 days
1971	14 days
1972	12 days
1973	18 days
1974	23 days
1975	12 days
1976	17 days
1977	16 days
1978	28 days
1979	18 days
1980	16 days
1981	12 days
1982	12 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.

Download the Data

Data for Essa Ont Hydro standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Essa 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-16. Last revised 16 October 2026 (2026-10-16).