Built 2026-10-17 (17 October 2026)

Preston Weather Records (CA006146711)

Record envelope, standing records and threshold days for Preston (CA006146711), Ontario, Canada, with 44 years of record.

Key Facts for Preston

  • Preston (CA006146711) is a weather station in Ontario, Canada at 43.40 latitude and -80.42 longitude, 291 m (955 ft) above sea level.
  • The station reports from 1953 to 1996, 44 years of record.
  • 1,464 records set at Preston still stand.
  • Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
  • Preston set a daily record snowfall of 10.0 cm (3.9 in) on 28 December 1983.

About the Station

  • Location: Ontario, Canada, 43.40 latitude, -80.42 longitude.
  • Elevation: 291 m (955 ft).
  • Period of record: 1953 to 1996, 44 years.
  • Eligible elements: tmax, tmin, prcp, snow.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Preston, with 2026 drawn through them The band shows the record high and record low for each calendar day at Preston. 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 Preston. 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 Preston, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan12.8 C (55.0 F)-31.7 C (-25.1 F)n/an/a
Feb12.8 C (55.0 F)-31.5 C (-24.7 F)n/an/a
Mar21.7 C (71.1 F)-26.0 C (-14.8 F)n/an/a
Apr28.3 C (82.9 F)-16.1 C (3.0 F)n/an/a
May31.7 C (89.1 F)-5.0 C (23.0 F)n/an/a
Jun33.9 C (93.0 F)-0.6 C (30.9 F)n/an/a
Jul38.3 C (100.9 F)3.3 C (37.9 F)n/an/a
Aug38.3 C (100.9 F)0.0 C (32.0 F)n/an/a
Sep36.1 C (97.0 F)-3.3 C (26.1 F)n/an/a
Oct29.4 C (84.9 F)-8.9 C (16.0 F)n/an/a
Nov23.3 C (73.9 F)-18.3 C (-0.9 F)n/an/a
Dec19.0 C (66.2 F)-28.9 C (-20.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Preston by the year they were set 1,464 records at Preston still stand. 1955 holds the most, with 70. 0204060801953: 311954: 501955: 701956: 531957: 571958: 411959: 601960: 441961: 401962: 381963: 611964: 571965: 651966: 531967: 651968: 441969: 341970: 321971: 381972: 441973: 521974: 401975: 441976: 451977: 501978: 471979: 561980: 291981: 461982: 371983: 4119531957196119651969197319771981
1,464 records at Preston still stand. 1955 holds the most, with 70.
Standing records at Preston by the year they were set
Year setStanding records
195331
195450
195570
195653
195757
195841
195960
196044
196140
196238
196361
196457
196565
196653
196765
196844
196934
197032
197138
197244
197352
197440
197544
197645
197750
197847
197956
198029
198146
198237
198341

Wettest Day of Each Month

Aug: 108.0 mm (4.3 in)
Record daily precipitation for each month at Preston The wettest day on record for each calendar month at Preston. The most was 108.0 mm (4.3 in) on 5 August 1968. 050100150 Jan: 34.3 mm (1.4 in), 14 January 1968 Jan Feb: 37.1 mm (1.5 in), 1 February 1968 Feb Mar: 39.9 mm (1.6 in), 6 March 1956 Mar Apr: 42.7 mm (1.7 in), 22 April 1977 Apr May: 49.8 mm (2.0 in), 16 May 1974 May Jun: 86.9 mm (3.4 in), 23 June 1960 Jun Jul: 64.3 mm (2.5 in), 26 July 1971 Jul Aug: 108.0 mm (4.3 in), 5 August 1968 Aug Sep: 81.3 mm (3.2 in), 17 September 1976 Sep Oct: 74.7 mm (2.9 in), 15 October 1954 Oct Nov: 48.3 mm (1.9 in), 9 November 1966 Nov Dec: 34.0 mm (1.3 in), 21 December 1967 Dec
The wettest day on record for each calendar month at Preston. The most was 108.0 mm (4.3 in) on 5 August 1968.
Record daily precipitation for each month at Preston
MonthRecord daily precipitation (mm)Date
Jan34.3 mm (1.4 in)14 January 1968
Feb37.1 mm (1.5 in)1 February 1968
Mar39.9 mm (1.6 in)6 March 1956
Apr42.7 mm (1.7 in)22 April 1977
May49.8 mm (2.0 in)16 May 1974
Jun86.9 mm (3.4 in)23 June 1960
Jul64.3 mm (2.5 in)26 July 1971
Aug108.0 mm (4.3 in)5 August 1968
Sep81.3 mm (3.2 in)17 September 1976
Oct74.7 mm (2.9 in)15 October 1954
Nov48.3 mm (1.9 in)9 November 1966
Dec34.0 mm (1.3 in)21 December 1967

Period of Record Coverage

1953 to 1983
Days with data per year at Preston 31 years of record at Preston, 1953 to 1983. 1 years have data for under 90 percent of days and are left out of rankings: 1953. 1953: 183 of 365 days1954: 365 of 365 days1955: 365 of 365 days1956: 366 of 366 days1957: 365 of 365 days1958: 365 of 365 days1959: 365 of 365 days1960: 366 of 366 days1961: 365 of 365 days1962: 365 of 365 days1963: 365 of 365 days1964: 366 of 366 days1965: 365 of 365 days1966: 365 of 365 days1967: 365 of 365 days1968: 366 of 366 days1969: 365 of 365 days1970: 365 of 365 days1971: 365 of 365 days1972: 366 of 366 days1973: 365 of 365 days1974: 365 of 365 days1975: 365 of 365 days1976: 366 of 366 days1977: 365 of 365 days1978: 365 of 365 days1979: 365 of 365 days1980: 366 of 366 days1981: 365 of 365 days1982: 337 of 365 days1983: 364 of 365 days195519601965197019751980
31 years of record at Preston, 1953 to 1983. 1 years have data for under 90 percent of days and are left out of rankings: 1953.
Days with data per year at Preston
YearDays with dataShare of yearComplete
195318350%No
1954365100%Yes
1955365100%Yes
1956366100%Yes
1957365100%Yes
1958365100%Yes
1959365100%Yes
1960366100%Yes
1961365100%Yes
1962365100%Yes
1963365100%Yes
1964366100%Yes
1965365100%Yes
1966365100%Yes
1967365100%Yes
1968366100%Yes
1969365100%Yes
1970365100%Yes
1971365100%Yes
1972366100%Yes
1973365100%Yes
1974365100%Yes
1975365100%Yes
1976366100%Yes
1977365100%Yes
1978365100%Yes
1979365100%Yes
1980366100%Yes
1981365100%Yes
198233792%Yes
1983364100%Yes

Latest Records

20
Latest records at Preston
DateStationRecordValueBeat old record byOld record stoodSignificance
28 December 1983Preston, CAdaily snowfall10.0 cm (3.9 in)3.6 cm (1.4 in)16 years19 of 100 (Routine)
28 December 1983Preston, CAdaily rain10.0 mm (0.4 in)3.6 mm (0.14 in)24 years16 of 100 (Routine)
26 December 1983Preston, CAdaily low min-21.0 C (-5.8 F)1.0 C (1.8 F)14 years8 of 100 (Routine)
26 December 1983Preston, CAdaily low max-11.0 C (12.2 F)0.5 C (0.9 F)5 years4 of 100 (Routine)
24 December 1983Preston, CAdaily low max-13.5 C (7.7 F)2.4 C (4.3 F)13 years11 of 100 (Routine)
21 December 1983Preston, CAdaily snowfall8.0 cm (3.1 in)1.6 cm (0.6 in)20 years14 of 100 (Routine)
19 December 1983Preston, CAdaily low max-12.0 C (10.4 F)2.6 C (4.7 F)20 years13 of 100 (Routine)
6 December 1983Preston, CAdaily snowfall7.0 cm (2.8 in)0.6 cm (0.2 in)24 years11 of 100 (Routine)
14 November 1983Preston, CAdaily low min-8.0 C (17.6 F)0.5 C (0.9 F)5 years5 of 100 (Routine)
13 November 1983Preston, CAdaily low min-9.5 C (14.9 F)1.5 C (2.7 F)5 years7 of 100 (Routine)
13 November 1983Preston, CAdaily low max-2.0 C (28.4 F)1.0 C (1.8 F)5 years5 of 100 (Routine)
12 November 1983Preston, CAdaily low max (Tie)-1.0 C (30.2 F)tie5 years1 of 100 (Routine)
10 November 1983Preston, CAdaily rain16.0 mm (0.6 in)0.2 mm (0.01 in)5 years4 of 100 (Routine)
9 November 1983Preston, CAdaily high max17.0 C (62.6 F)1.4 C (2.5 F)16 years10 of 100 (Routine)
4 October 1983Preston, CAdaily high min17.0 C (62.6 F)2.0 C (3.6 F)12 years10 of 100 (Routine)
19 September 1983Preston, CAdaily high min18.5 C (65.3 F)2.4 C (4.3 F)17 years12 of 100 (Routine)
16 September 1983Preston, CAdaily rain34.6 mm (1.4 in)18.9 mm (0.7 in)20 years28 of 100 (Routine)
10 September 1983Preston, CAdaily high max33.5 C (92.3 F)3.5 C (6.3 F)28 years18 of 100 (Routine)
10 September 1983Preston, CAdaily high min21.5 C (70.7 F)0.4 C (0.7 F)20 years9 of 100 (Routine)
6 September 1983Preston, CAmonthly high min22.0 C (71.6 F)0.9 C (1.6 F)21 years20 of 100 (Routine)

Climate Trend

29 complete years, 1954 to 1983
Annual mean temperature at Preston as warming stripes, 1954 to 1983 One stripe for each of 29 complete years at Preston, 1954 to 1983. Blue stripes are years cooler than the station's own mean of 6.9 C (44.3 F); red stripes are warmer. The coolest year was 1978, at 5.5 C (41.8 F), and the warmest was 1973, at 7.9 C (46.3 F). The strongest colour marks a difference of 1.4 C (2.5 F). 1954: 7.2 C, +0.4 C from the station mean1955: 7.9 C, +1.0 C from the station mean1956: 6.6 C, -0.2 C from the station mean1957: 7.2 C, +0.4 C from the station mean1958: 6.4 C, -0.5 C from the station mean1959: 7.1 C, +0.2 C from the station mean1960: 6.4 C, -0.4 C from the station mean1961: 7.2 C, +0.4 C from the station mean1962: 6.6 C, -0.3 C from the station mean1963: 6.5 C, -0.4 C from the station mean1964: 7.3 C, +0.4 C from the station mean1965: 6.6 C, -0.2 C from the station mean1966: 7.0 C, +0.1 C from the station mean1967: 6.4 C, -0.5 C from the station mean1968: 6.9 C, +0.1 C from the station mean1969: 7.0 C, +0.2 C from the station mean1970: 6.9 C, 0.0 C from the station mean1971: 7.2 C, +0.3 C from the station mean1972: 6.1 C, -0.7 C from the station mean1973: 7.9 C, +1.1 C from the station mean1974: 6.9 C, 0.0 C from the station mean1975: 7.7 C, +0.8 C from the station mean1976: 6.3 C, -0.6 C from the station mean1977: 6.7 C, -0.2 C from the station mean1978: 5.5 C, -1.4 C from the station mean1979: 6.5 C, -0.4 C from the station mean1980: 6.4 C, -0.5 C from the station mean1981: 6.9 C, +0.1 C from the station mean1983: 7.7 C, +0.8 C from the station mean195419601965197019751980
One stripe for each of 29 complete years at Preston, 1954 to 1983. Blue stripes are years cooler than the station's own mean of 6.9 C (44.3 F); red stripes are warmer. The coolest year was 1978, at 5.5 C (41.8 F), and the warmest was 1973, at 7.9 C (46.3 F). The strongest colour marks a difference of 1.4 C (2.5 F).
Annual mean temperature at Preston as warming stripes, 1954 to 1983
YearAnnual mean temperatureDifference from the station mean
19547.2 C+0.38 C
19557.9 C+1.00 C
19566.6 C-0.24 C
19577.2 C+0.37 C
19586.4 C-0.46 C
19597.1 C+0.24 C
19606.4 C-0.42 C
19617.2 C+0.36 C
19626.6 C-0.26 C
19636.5 C-0.41 C
19647.3 C+0.42 C
19656.6 C-0.23 C
19667.0 C+0.10 C
19676.4 C-0.46 C
19686.9 C+0.05 C
19697.0 C+0.15 C
19706.9 C-0.01 C
19717.2 C+0.31 C
19726.1 C-0.75 C
19737.9 C+1.08 C
19746.9 C+0.00 C
19757.7 C+0.80 C
19766.3 C-0.57 C
19776.7 C-0.21 C
19785.5 C-1.39 C
19796.5 C-0.38 C
19806.4 C-0.48 C
19816.9 C+0.08 C
19837.7 C+0.80 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

1953 to 1983
Yearly extremes at Preston: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)38.3 C (100.9 F)195532.8 C (91.0 F)31
Coldest night (TNn)-31.7 C (-25.1 F)1976-26.1 C (-15.0 F)31
Wettest day (Rx1day)108.0 mm (4.3 in)196848.3 mm (1.9 in)31
Wettest five days (Rx5day)147.3 mm (5.8 in)195472.4 mm (2.9 in)31
Longest dry spell (CDD)29 days196917 days31

Hottest day (TXx)

Hottest day (TXx) at Preston by year The hottest day of the year at Preston, 1953 to 1983. The record is 38.3 C (100.9 F) in 1955, marked on the chart; the median year is 32.8 C (91.0 F). 3032.53537.540195519601965197019751980Record: 38.3 C (100.9 F) in 1955
The hottest day of the year at Preston, 1953 to 1983. The record is 38.3 C (100.9 F) in 1955, marked on the chart; the median year is 32.8 C (91.0 F).
Hottest day (TXx) at Preston by year
YearHottest day (TXx)
195336.1 C (97.0 F)
195432.8 C (91.0 F)
195538.3 C (100.9 F)
195631.7 C (89.1 F)
195732.8 C (91.0 F)
195833.3 C (91.9 F)
195934.4 C (93.9 F)
196032.2 C (90.0 F)
196131.7 C (89.1 F)
196232.2 C (90.0 F)
196332.8 C (91.0 F)
196433.3 C (91.9 F)
196532.8 C (91.0 F)
196635.6 C (96.1 F)
196731.1 C (88.0 F)
196833.3 C (91.9 F)
196932.2 C (90.0 F)
197030.6 C (87.1 F)
197133.9 C (93.0 F)
197231.7 C (89.1 F)
197334.4 C (93.9 F)
197432.8 C (91.0 F)
197535.0 C (95.0 F)
197631.1 C (88.0 F)
197733.0 C (91.4 F)
197834.0 C (93.2 F)
197931.0 C (87.8 F)
198032.0 C (89.6 F)
198133.0 C (91.4 F)
198230.0 C (86.0 F)
198335.0 C (95.0 F)

Coldest night (TNn)

Coldest night (TNn) at Preston by year The coldest night of the year at Preston, 1953 to 1983. The record is -31.7 C (-25.1 F) in 1976, marked on the chart; the median year is -26.1 C (-15.0 F). -35-30-25-20195519601965197019751980Record: -31.7 C (-25.1 F) in 1976
The coldest night of the year at Preston, 1953 to 1983. The record is -31.7 C (-25.1 F) in 1976, marked on the chart; the median year is -26.1 C (-15.0 F).
Coldest night (TNn) at Preston by year
YearColdest night (TNn)
1953-20.0 C (-4.0 F)
1954-25.6 C (-14.1 F)
1955-26.1 C (-15.0 F)
1956-22.8 C (-9.0 F)
1957-26.1 C (-15.0 F)
1958-28.9 C (-20.0 F)
1959-28.9 C (-20.0 F)
1960-27.2 C (-17.0 F)
1961-27.2 C (-17.0 F)
1962-25.6 C (-14.1 F)
1963-25.6 C (-14.1 F)
1964-24.4 C (-11.9 F)
1965-23.9 C (-11.0 F)
1966-25.6 C (-14.1 F)
1967-26.7 C (-16.1 F)
1968-27.2 C (-17.0 F)
1969-21.7 C (-7.1 F)
1970-28.9 C (-20.0 F)
1971-22.8 C (-9.0 F)
1972-23.3 C (-9.9 F)
1973-23.3 C (-9.9 F)
1974-23.3 C (-9.9 F)
1975-23.3 C (-9.9 F)
1976-31.7 C (-25.1 F)
1977-31.1 C (-24.0 F)
1978-31.0 C (-23.8 F)
1979-31.5 C (-24.7 F)
1980-28.0 C (-18.4 F)
1981-30.0 C (-22.0 F)
1982-26.5 C (-15.7 F)
1983-21.0 C (-5.8 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Preston by year The wettest day of the year at Preston, 1953 to 1983. The record is 108.0 mm (4.3 in) in 1968, marked on the chart; the median year is 48.3 mm (1.9 in). 20406080100120195519601965197019751980Record: 108.0 mm (4.3 in) in 1968
The wettest day of the year at Preston, 1953 to 1983. The record is 108.0 mm (4.3 in) in 1968, marked on the chart; the median year is 48.3 mm (1.9 in).
Wettest day (Rx1day) at Preston by year
YearWettest day (Rx1day)
195349.5 mm (1.9 in)
195474.7 mm (2.9 in)
195541.7 mm (1.6 in)
195658.4 mm (2.3 in)
195742.9 mm (1.7 in)
195849.0 mm (1.9 in)
195936.6 mm (1.4 in)
196086.9 mm (3.4 in)
196134.5 mm (1.4 in)
196254.6 mm (2.1 in)
196343.7 mm (1.7 in)
196466.0 mm (2.6 in)
196543.4 mm (1.7 in)
196648.3 mm (1.9 in)
196759.4 mm (2.3 in)
1968108.0 mm (4.3 in)
196940.1 mm (1.6 in)
197028.4 mm (1.1 in)
197164.3 mm (2.5 in)
197241.9 mm (1.6 in)
197335.6 mm (1.4 in)
197449.8 mm (2.0 in)
197579.5 mm (3.1 in)
197681.3 mm (3.2 in)
197742.7 mm (1.7 in)
197854.4 mm (2.1 in)
197948.0 mm (1.9 in)
198038.2 mm (1.5 in)
198141.0 mm (1.6 in)
198259.0 mm (2.3 in)
198334.6 mm (1.4 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Preston by year The wettest five days of the year at Preston, 1953 to 1983. The record is 147.3 mm (5.8 in) in 1954, marked on the chart; the median year is 72.4 mm (2.9 in). 050100150195519601965197019751980Record: 147.3 mm (5.8 in) in 1954
The wettest five days of the year at Preston, 1953 to 1983. The record is 147.3 mm (5.8 in) in 1954, marked on the chart; the median year is 72.4 mm (2.9 in).
Wettest five days (Rx5day) at Preston by year
YearWettest five days (Rx5day)
195360.5 mm (2.4 in)
1954147.3 mm (5.8 in)
195564.4 mm (2.5 in)
1956120.2 mm (4.7 in)
195791.6 mm (3.6 in)
195865.2 mm (2.6 in)
195965.8 mm (2.6 in)
196087.2 mm (3.4 in)
196138.3 mm (1.5 in)
196296.0 mm (3.8 in)
196372.4 mm (2.9 in)
196492.3 mm (3.6 in)
196563.7 mm (2.5 in)
196680.0 mm (3.1 in)
1967130.5 mm (5.1 in)
1968119.6 mm (4.7 in)
196951.8 mm (2.0 in)
197063.8 mm (2.5 in)
197174.3 mm (2.9 in)
197273.7 mm (2.9 in)
197366.5 mm (2.6 in)
197466.8 mm (2.6 in)
1975115.6 mm (4.6 in)
197686.4 mm (3.4 in)
197769.5 mm (2.7 in)
1978101.4 mm (4.0 in)
197973.2 mm (2.9 in)
198052.8 mm (2.1 in)
198166.8 mm (2.6 in)
198266.2 mm (2.6 in)
198363.5 mm (2.5 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Preston by year The longest dry spell of the year at Preston, 1953 to 1983. The record is 29 days in 1969, marked on the chart; the median year is 17 days. 1015202530195519601965197019751980Record: 29 days in 1969
The longest dry spell of the year at Preston, 1953 to 1983. The record is 29 days in 1969, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Preston by year
YearLongest dry spell (CDD)
195316 days
195414 days
195518 days
195619 days
195722 days
195815 days
195922 days
196014 days
196118 days
196219 days
196327 days
196411 days
196515 days
196619 days
196723 days
196811 days
196929 days
197015 days
197117 days
197213 days
197327 days
197414 days
197520 days
197614 days
197719 days
197818 days
197916 days
198011 days
198112 days
198216 days
198323 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

29 years with a frost

Across 29 years with a frost, the median last spring frost at Preston falls on 18 May and the median first autumn frost on 26 September, which leaves a median of 126 days between them.

Fitted over all years, the growing season changes by +9.2 days per decade at this station.

Frost dates and growing season at Preston
MeasureMedian, all yearsEarliest periodRecent period (1954 to 1983)Recent against earliestFitted trend
Last spring frost18 Mayn/a18 Mayn/a-4.3 days per decade
First autumn frost26 Septembern/a26 Septembern/a+5.0 days per decade
Growing days126 daysn/a126 daysn/a+9.2 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

30 years, 1954 to 1983

A day with at least 48.2 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 126.3 mm (5.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Preston: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years48.2 mm (1.9 in)
5 years63.9 mm (2.5 in)
10 years76.1 mm (3.0 in)
25 years94.0 mm (3.7 in)
50 years109.2 mm (4.3 in)Longer than the 30 years of record
100 years126.3 mm (5.0 in)Longer than the 30 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, 30 years of values from 1954 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: 108.0 mm (4.3 in) in 1968; 86.9 mm (3.4 in) in 1960; 81.3 mm (3.2 in) in 1976.

Download the Data

  • Data for Preston standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Preston 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 (2026-10-15).