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Built 2026-10-15 (15 October 2026)

Thornbury Slama Weather Records (CA00611HBEC)

Record envelope, standing records and threshold days for Thornbury Slama (CA00611HBEC), Ontario, Canada, with 38 years of record.

Key Facts for Thornbury Slama

  • Thornbury Slama (CA00611HBEC) is a weather station in Ontario, Canada at 44.57 latitude and -80.48 longitude, 213 m (699 ft) above sea level.
  • The station reports from 1968 to 2005, 38 years of record.
  • 1,464 records set at Thornbury Slama 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, 44.57 latitude, -80.48 longitude.
  • Elevation: 213 m (699 ft).
  • Period of record: 1968 to 2005, 38 years.
  • Eligible elements: none yet.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Thornbury Slama, with 2026 drawn through them The band shows the record high and record low for each calendar day at Thornbury Slama. 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 Thornbury Slama. 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 Thornbury Slama, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan14.4 C (57.9 F)-30.6 C (-23.1 F)n/an/a
Feb12.0 C (53.6 F)-31.5 C (-24.7 F)n/an/a
Mar22.8 C (73.0 F)-28.0 C (-18.4 F)n/an/a
Apr28.3 C (82.9 F)-13.3 C (8.1 F)n/an/a
May32.8 C (91.0 F)-3.3 C (26.1 F)n/an/a
Jun32.5 C (90.5 F)0.6 C (33.1 F)n/an/a
Jul35.0 C (95.0 F)5.0 C (41.0 F)n/an/a
Aug32.2 C (90.0 F)3.9 C (39.0 F)n/an/a
Sep33.5 C (92.3 F)-0.5 C (31.1 F)n/an/a
Oct28.9 C (84.0 F)-5.0 C (23.0 F)n/an/a
Nov22.5 C (72.5 F)-12.8 C (9.0 F)n/an/a
Dec20.0 C (68.0 F)-26.0 C (-14.8 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Thornbury Slama by the year they were set 1,464 records at Thornbury Slama still stand. 1979 holds the most, with 118. 0501001501968: 571969: 871970: 991971: 991972: 981973: 1061974: 831975: 901976: 1171977: 1011978: 721979: 1181980: 741981: 911982: 801983: 9219681970197219741976197819801982
1,464 records at Thornbury Slama still stand. 1979 holds the most, with 118.
Standing records at Thornbury Slama by the year they were set
Year setStanding records
196857
196987
197099
197199
197298
1973106
197483
197590
1976117
1977101
197872
1979118
198074
198191
198280
198392

Wettest Day of Each Month

Aug: 89.4 mm (3.5 in)
Record daily precipitation for each month at Thornbury Slama The wettest day on record for each calendar month at Thornbury Slama. The most was 89.4 mm (3.5 in) on 19 August 1968. 0255075100 Jan: 32.0 mm (1.3 in), 13 January 1979 Jan Feb: 20.2 mm (0.8 in), 3 February 1982 Feb Mar: 32.8 mm (1.3 in), 4 March 1976 Mar Apr: 48.2 mm (1.9 in), 13 April 1979 Apr May: 38.6 mm (1.5 in), 10 May 1981 May Jun: 56.2 mm (2.2 in), 19 June 1980 Jun Jul: 67.4 mm (2.7 in), 20 July 1980 Jul Aug: 89.4 mm (3.5 in), 19 August 1968 Aug Sep: 36.2 mm (1.4 in), 20 September 1983 Sep Oct: 27.2 mm (1.1 in), 22 October 1972 Oct Nov: 30.6 mm (1.2 in), 15 November 1983 Nov Dec: 30.2 mm (1.2 in), 24 December 1979 Dec
The wettest day on record for each calendar month at Thornbury Slama. The most was 89.4 mm (3.5 in) on 19 August 1968.
Record daily precipitation for each month at Thornbury Slama
MonthRecord daily precipitation (mm)Date
Jan32.0 mm (1.3 in)13 January 1979
Feb20.2 mm (0.8 in)3 February 1982
Mar32.8 mm (1.3 in)4 March 1976
Apr48.2 mm (1.9 in)13 April 1979
May38.6 mm (1.5 in)10 May 1981
Jun56.2 mm (2.2 in)19 June 1980
Jul67.4 mm (2.7 in)20 July 1980
Aug89.4 mm (3.5 in)19 August 1968
Sep36.2 mm (1.4 in)20 September 1983
Oct27.2 mm (1.1 in)22 October 1972
Nov30.6 mm (1.2 in)15 November 1983
Dec30.2 mm (1.2 in)24 December 1979

Period of Record Coverage

1968 to 1983
Days with data per year at Thornbury Slama 16 years of record at Thornbury Slama, 1968 to 1983. 1 years have data for under 90 percent of days and are left out of rankings: 1968. 1968: 235 of 366 days1969: 356 of 365 days1970: 365 of 365 days1971: 364 of 365 days1972: 365 of 366 days1973: 365 of 365 days1974: 365 of 365 days1975: 365 of 365 days1976: 366 of 366 days1977: 364 of 365 days1978: 365 of 365 days1979: 365 of 365 days1980: 366 of 366 days1981: 365 of 365 days1982: 359 of 365 days1983: 364 of 365 days197019751980
16 years of record at Thornbury Slama, 1968 to 1983. 1 years have data for under 90 percent of days and are left out of rankings: 1968.
Days with data per year at Thornbury Slama
YearDays with dataShare of yearComplete
196823564%No
196935698%Yes
1970365100%Yes
1971364100%Yes
1972365100%Yes
1973365100%Yes
1974365100%Yes
1975365100%Yes
1976366100%Yes
1977364100%Yes
1978365100%Yes
1979365100%Yes
1980366100%Yes
1981365100%Yes
198235998%Yes
1983364100%Yes

Latest Records

0

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

Climate Trend

15 complete years, 1969 to 1983
Annual mean temperature at Thornbury Slama as warming stripes, 1969 to 1983 One stripe for each of 15 complete years at Thornbury Slama, 1969 to 1983. Blue stripes are years cooler than the station's own mean of 6.5 C (43.7 F); red stripes are warmer. The coolest year was 1972, at 5.4 C (41.8 F), and the warmest was 1973, at 7.8 C (46.0 F). The strongest colour marks a difference of 1.3 C (2.3 F). 1969: 6.3 C, -0.2 C from the station mean1970: 6.5 C, -0.1 C from the station mean1971: 6.8 C, +0.3 C from the station mean1972: 5.4 C, -1.1 C from the station mean1973: 7.8 C, +1.2 C from the station mean1974: 6.5 C, 0.0 C from the station mean1975: 7.4 C, +0.8 C from the station mean1976: 6.1 C, -0.4 C from the station mean1977: 6.6 C, +0.1 C from the station mean1978: 5.8 C, -0.7 C from the station mean1979: 6.3 C, -0.2 C from the station mean1980: 6.0 C, -0.5 C from the station mean1981: 6.7 C, +0.2 C from the station mean1982: 6.3 C, -0.2 C from the station mean1983: 7.1 C, +0.6 C from the station mean19691970197219741976197819801982
One stripe for each of 15 complete years at Thornbury Slama, 1969 to 1983. Blue stripes are years cooler than the station's own mean of 6.5 C (43.7 F); red stripes are warmer. The coolest year was 1972, at 5.4 C (41.8 F), and the warmest was 1973, at 7.8 C (46.0 F). The strongest colour marks a difference of 1.3 C (2.3 F).
Annual mean temperature at Thornbury Slama as warming stripes, 1969 to 1983
YearAnnual mean temperatureDifference from the station mean
19696.3 C-0.21 C
19706.5 C-0.06 C
19716.8 C+0.32 C
19725.4 C-1.08 C
19737.8 C+1.24 C
19746.5 C+0.02 C
19757.4 C+0.84 C
19766.1 C-0.39 C
19776.6 C+0.06 C
19785.8 C-0.69 C
19796.3 C-0.21 C
19806.0 C-0.49 C
19816.7 C+0.20 C
19826.3 C-0.19 C
19837.1 C+0.62 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

1968 to 1983
Yearly extremes at Thornbury Slama: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)35.0 C (95.0 F)197732.2 C (90.0 F)16
Coldest night (TNn)-31.5 C (-24.7 F)1979-25.2 C (-13.5 F)16
Wettest day (Rx1day)89.4 mm (3.5 in)196839.8 mm (1.6 in)16
Wettest five days (Rx5day)160.8 mm (6.3 in)196870.9 mm (2.8 in)16
Longest dry spell (CDD)28 days197014 days16

Hottest day (TXx)

Hottest day (TXx) at Thornbury Slama by year The hottest day of the year at Thornbury Slama, 1968 to 1983. The record is 35.0 C (95.0 F) in 1977, marked on the chart; the median year is 32.2 C (90.0 F). 30323436197019751980Record: 35.0 C (95.0 F) in 1977
The hottest day of the year at Thornbury Slama, 1968 to 1983. The record is 35.0 C (95.0 F) in 1977, marked on the chart; the median year is 32.2 C (90.0 F).
Hottest day (TXx) at Thornbury Slama by year
YearHottest day (TXx)
196833.3 C (91.9 F)
196931.7 C (89.1 F)
197031.7 C (89.1 F)
197132.2 C (90.0 F)
197231.7 C (89.1 F)
197333.3 C (91.9 F)
197432.2 C (90.0 F)
197532.2 C (90.0 F)
197632.2 C (90.0 F)
197735.0 C (95.0 F)
197833.0 C (91.4 F)
197933.0 C (91.4 F)
198030.0 C (86.0 F)
198131.5 C (88.7 F)
198231.5 C (88.7 F)
198333.5 C (92.3 F)

Coldest night (TNn)

Coldest night (TNn) at Thornbury Slama by year The coldest night of the year at Thornbury Slama, 1968 to 1983. The record is -31.5 C (-24.7 F) in 1979, marked on the chart; the median year is -25.2 C (-13.5 F). -35-30-25-20-15197019751980Record: -31.5 C (-24.7 F) in 1979
The coldest night of the year at Thornbury Slama, 1968 to 1983. The record is -31.5 C (-24.7 F) in 1979, marked on the chart; the median year is -25.2 C (-13.5 F).
Coldest night (TNn) at Thornbury Slama by year
YearColdest night (TNn)
1968-17.2 C (1.0 F)
1969-21.7 C (-7.1 F)
1970-24.4 C (-11.9 F)
1971-22.8 C (-9.0 F)
1972-24.4 C (-11.9 F)
1973-26.1 C (-15.0 F)
1974-23.3 C (-9.9 F)
1975-22.8 C (-9.0 F)
1976-27.8 C (-18.0 F)
1977-30.6 C (-23.1 F)
1978-29.5 C (-21.1 F)
1979-31.5 C (-24.7 F)
1980-28.0 C (-18.4 F)
1981-28.0 C (-18.4 F)
1982-28.0 C (-18.4 F)
1983-24.0 C (-11.2 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Thornbury Slama by year The wettest day of the year at Thornbury Slama, 1968 to 1983. The record is 89.4 mm (3.5 in) in 1968, marked on the chart; the median year is 39.8 mm (1.6 in). 20406080100197019751980Record: 89.4 mm (3.5 in) in 1968
The wettest day of the year at Thornbury Slama, 1968 to 1983. The record is 89.4 mm (3.5 in) in 1968, marked on the chart; the median year is 39.8 mm (1.6 in).
Wettest day (Rx1day) at Thornbury Slama by year
YearWettest day (Rx1day)
196889.4 mm (3.5 in)
196972.1 mm (2.8 in)
197026.7 mm (1.1 in)
197146.5 mm (1.8 in)
197228.4 mm (1.1 in)
197338.9 mm (1.5 in)
197463.8 mm (2.5 in)
197537.3 mm (1.5 in)
197638.4 mm (1.5 in)
197732.0 mm (1.3 in)
197836.2 mm (1.4 in)
197948.2 mm (1.9 in)
198067.4 mm (2.7 in)
198140.6 mm (1.6 in)
198251.6 mm (2.0 in)
198336.2 mm (1.4 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Thornbury Slama by year The wettest five days of the year at Thornbury Slama, 1968 to 1983. The record is 160.8 mm (6.3 in) in 1968, marked on the chart; the median year is 70.9 mm (2.8 in). 50100150200197019751980Record: 160.8 mm (6.3 in) in 1968
The wettest five days of the year at Thornbury Slama, 1968 to 1983. The record is 160.8 mm (6.3 in) in 1968, marked on the chart; the median year is 70.9 mm (2.8 in).
Wettest five days (Rx5day) at Thornbury Slama by year
YearWettest five days (Rx5day)
1968160.8 mm (6.3 in)
196982.0 mm (3.2 in)
197062.6 mm (2.5 in)
197151.5 mm (2.0 in)
197263.0 mm (2.5 in)
1973100.1 mm (3.9 in)
197486.9 mm (3.4 in)
197566.8 mm (2.6 in)
197668.2 mm (2.7 in)
197751.0 mm (2.0 in)
197863.0 mm (2.5 in)
197976.4 mm (3.0 in)
198098.8 mm (3.9 in)
198172.2 mm (2.8 in)
198288.8 mm (3.5 in)
198369.6 mm (2.7 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Thornbury Slama by year The longest dry spell of the year at Thornbury Slama, 1968 to 1983. The record is 28 days in 1970, marked on the chart; the median year is 14 days. 1015202530197019751980Record: 28 days in 1970
The longest dry spell of the year at Thornbury Slama, 1968 to 1983. The record is 28 days in 1970, marked on the chart; the median year is 14 days.
Longest dry spell (CDD) at Thornbury Slama by year
YearLongest dry spell (CDD)
196813 days
196915 days
197028 days
197121 days
197213 days
197314 days
197412 days
197518 days
197614 days
197713 days
197825 days
197913 days
198010 days
198112 days
198213 days
198316 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 Thornbury Slama standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Thornbury Slama 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 . Last revised (2026-10-14).