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Built 2026-10-17 (17 October 2026)

Dunnville Weather Records (CA006132144)

Record envelope, standing records and threshold days for Dunnville (CA006132144), Ontario, Canada, with 64 years of record.

Key Facts for Dunnville

  • Dunnville (CA006132144) is a weather station in Ontario, Canada at 42.92 latitude and -79.70 longitude, 178 m (584 ft) above sea level.
  • The station reports from 1899 to 1962, 64 years of record.
  • 1,460 records set at Dunnville 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, 42.92 latitude, -79.70 longitude.
  • Elevation: 178 m (584 ft).
  • Period of record: 1899 to 1962, 64 years.
  • Eligible elements: none yet.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Dunnville, with 2026 drawn through them The band shows the record high and record low for each calendar day at Dunnville. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -40-2002040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Dunnville. 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 Dunnville, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan9.4 C (48.9 F)-18.9 C (-2.0 F)n/an/a
Feb12.8 C (55.0 F)-20.0 C (-4.0 F)n/an/a
Mar21.1 C (70.0 F)-20.6 C (-5.1 F)n/an/a
Apr23.9 C (75.0 F)-7.8 C (18.0 F)n/an/a
May26.7 C (80.1 F)-1.7 C (28.9 F)n/an/a
Jun30.0 C (86.0 F)4.4 C (39.9 F)n/an/a
Jul33.3 C (91.9 F)7.8 C (46.0 F)n/an/a
Aug31.1 C (88.0 F)8.3 C (46.9 F)n/an/a
Sep31.7 C (89.1 F)2.2 C (36.0 F)n/an/a
Oct26.7 C (80.1 F)-3.3 C (26.1 F)n/an/a
Nov24.4 C (75.9 F)-8.9 C (16.0 F)n/an/a
Dec14.4 C (57.9 F)-21.7 C (-7.1 F)n/an/a

Which Years Hold Standing Records

1,460 standing records
Standing records at Dunnville by the year they were set 1,460 records at Dunnville still stand. 1900 holds the most, with 456. 02004006001899: 541900: 4561901: 3761902: 3871903: 1731956: 14189919001901190219031956
1,460 records at Dunnville still stand. 1900 holds the most, with 456.
Standing records at Dunnville by the year they were set
Year setStanding records
189954
1900456
1901376
1902387
1903173
195614

Wettest Day of Each Month

Oct: 109.2 mm (4.3 in)
Record daily precipitation for each month at Dunnville The wettest day on record for each calendar month at Dunnville. The most was 109.2 mm (4.3 in) on 15 October 1954. 050100150 Jan: 41.7 mm (1.6 in), 22 January 1957 Jan Feb: 68.8 mm (2.7 in), 16 February 1954 Feb Mar: 30.5 mm (1.2 in), 1 March 1900 Mar Apr: 49.8 mm (2.0 in), 21 April 1901 Apr May: 49.3 mm (1.9 in), 19 May 1957 May Jun: 56.1 mm (2.2 in), 13 June 1962 Jun Jul: 36.8 mm (1.4 in), 19 July 1902 Jul Aug: 55.9 mm (2.2 in), 13 August 1955 Aug Sep: 60.7 mm (2.4 in), 30 September 1959 Sep Oct: 109.2 mm (4.3 in), 15 October 1954 Oct Nov: 48.8 mm (1.9 in), 19 November 1900 Nov Dec: 30.2 mm (1.2 in), 14 December 1901 Dec
The wettest day on record for each calendar month at Dunnville. The most was 109.2 mm (4.3 in) on 15 October 1954.
Record daily precipitation for each month at Dunnville
MonthRecord daily precipitation (mm)Date
Jan41.7 mm (1.6 in)22 January 1957
Feb68.8 mm (2.7 in)16 February 1954
Mar30.5 mm (1.2 in)1 March 1900
Apr49.8 mm (2.0 in)21 April 1901
May49.3 mm (1.9 in)19 May 1957
Jun56.1 mm (2.2 in)13 June 1962
Jul36.8 mm (1.4 in)19 July 1902
Aug55.9 mm (2.2 in)13 August 1955
Sep60.7 mm (2.4 in)30 September 1959
Oct109.2 mm (4.3 in)15 October 1954
Nov48.8 mm (1.9 in)19 November 1900
Dec30.2 mm (1.2 in)14 December 1901

Period of Record Coverage

1899 to 1956
Days with data per year at Dunnville 6 years of record at Dunnville, 1899 to 1956. 3 years have data for under 90 percent of days and are left out of rankings: 1899, 1903, 1956. 1899: 52 of 365 days1900: 358 of 365 days1901: 341 of 365 days1902: 359 of 365 days1903: 150 of 365 days1956: 14 of 366 days1900
6 years of record at Dunnville, 1899 to 1956. 3 years have data for under 90 percent of days and are left out of rankings: 1899, 1903, 1956.
Days with data per year at Dunnville
YearDays with dataShare of yearComplete
18995214%No
190035898%Yes
190134193%Yes
190235998%Yes
190315041%No
1956144%No

Latest Records

0

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

Extremes by Year

1899 to 1962
Yearly extremes at Dunnville: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)33.3 C (91.9 F)190130.0 C (86.0 F)6
Coldest night (TNn)-21.7 C (-7.1 F)1899-20.0 C (-4.0 F)6
Wettest day (Rx1day)109.2 mm (4.3 in)195448.8 mm (1.9 in)15
Wettest five days (Rx5day)155.6 mm (6.1 in)195469.5 mm (2.7 in)15
Longest dry spell (CDD)34 days195518 days15

Hottest day (TXx)

Hottest day (TXx) at Dunnville by year The hottest day of the year at Dunnville, 1899 to 1962. The record is 33.3 C (91.9 F) in 1901, marked on the chart; the median year is 30.0 C (86.0 F). 22.52527.53032.5351900192019401960Record: 33.3 C (91.9 F) in 1901
The hottest day of the year at Dunnville, 1899 to 1962. The record is 33.3 C (91.9 F) in 1901, marked on the chart; the median year is 30.0 C (86.0 F).
Hottest day (TXx) at Dunnville by year
YearHottest day (TXx)
189924.4 C (75.9 F)
190031.7 C (89.1 F)
190133.3 C (91.9 F)
190228.3 C (82.9 F)
190326.7 C (80.1 F)
1953n/a
1954n/a
1955n/a
195632.2 C (90.0 F)
1957n/a
1958n/a
1959n/a
1960n/a
1961n/a
1962n/a

Coldest night (TNn)

Coldest night (TNn) at Dunnville by year The coldest night of the year at Dunnville, 1899 to 1962. The record is -21.7 C (-7.1 F) in 1899, marked on the chart; the median year is -20.0 C (-4.0 F). -30-20-100101900192019401960Record: -21.7 C (-7.1 F) in 1899
The coldest night of the year at Dunnville, 1899 to 1962. The record is -21.7 C (-7.1 F) in 1899, marked on the chart; the median year is -20.0 C (-4.0 F).
Coldest night (TNn) at Dunnville by year
YearColdest night (TNn)
1899-21.7 C (-7.1 F)
1900-20.0 C (-4.0 F)
1901-21.7 C (-7.1 F)
1902-19.4 C (-2.9 F)
1903-20.0 C (-4.0 F)
1953n/a
1954n/a
1955n/a
19568.9 C (48.0 F)
1957n/a
1958n/a
1959n/a
1960n/a
1961n/a
1962n/a

Wettest day (Rx1day)

Wettest day (Rx1day) at Dunnville by year The wettest day of the year at Dunnville, 1899 to 1962. The record is 109.2 mm (4.3 in) in 1954, marked on the chart; the median year is 48.8 mm (1.9 in). 02550751001251900192019401960Record: 109.2 mm (4.3 in) in 1954
The wettest day of the year at Dunnville, 1899 to 1962. The record is 109.2 mm (4.3 in) in 1954, marked on the chart; the median year is 48.8 mm (1.9 in).
Wettest day (Rx1day) at Dunnville by year
YearWettest day (Rx1day)
189921.3 mm (0.8 in)
190048.8 mm (1.9 in)
190153.1 mm (2.1 in)
190236.8 mm (1.4 in)
190335.3 mm (1.4 in)
195315.5 mm (0.6 in)
1954109.2 mm (4.3 in)
195555.9 mm (2.2 in)
195643.4 mm (1.7 in)
195749.3 mm (1.9 in)
195834.5 mm (1.4 in)
195960.7 mm (2.4 in)
196030.5 mm (1.2 in)
196154.1 mm (2.1 in)
196256.1 mm (2.2 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Dunnville by year The wettest five days of the year at Dunnville, 1899 to 1962. The record is 155.6 mm (6.1 in) in 1954, marked on the chart; the median year is 69.5 mm (2.7 in). 0501001502001900192019401960Record: 155.6 mm (6.1 in) in 1954
The wettest five days of the year at Dunnville, 1899 to 1962. The record is 155.6 mm (6.1 in) in 1954, marked on the chart; the median year is 69.5 mm (2.7 in).
Wettest five days (Rx5day) at Dunnville by year
YearWettest five days (Rx5day)
189943.1 mm (1.7 in)
190068.6 mm (2.7 in)
190176.8 mm (3.0 in)
190263.5 mm (2.5 in)
190348.8 mm (1.9 in)
195333.3 mm (1.3 in)
1954155.6 mm (6.1 in)
195575.4 mm (3.0 in)
195669.5 mm (2.7 in)
195770.9 mm (2.8 in)
195865.5 mm (2.6 in)
1959102.9 mm (4.1 in)
196070.0 mm (2.8 in)
196194.2 mm (3.7 in)
196266.8 mm (2.6 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Dunnville by year The longest dry spell of the year at Dunnville, 1899 to 1962. The record is 34 days in 1955, marked on the chart; the median year is 18 days. 0102030401900192019401960Record: 34 days in 1955
The longest dry spell of the year at Dunnville, 1899 to 1962. The record is 34 days in 1955, marked on the chart; the median year is 18 days.
Longest dry spell (CDD) at Dunnville by year
YearLongest dry spell (CDD)
189910 days
190017 days
190114 days
190232 days
190316 days
19539 days
195414 days
195534 days
195615 days
195723 days
195825 days
195923 days
196025 days
196118 days
196231 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 Dunnville standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Dunnville 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2025-12-31).