Built 2026-10-19 (19 October 2026)

Montreal Jar Bot Weather Records (CA007025257)

Record envelope, standing records and threshold days for Montreal Jar Bot (CA007025257), Quebec, Canada, with 42 years of record.

Key Facts for Montreal Jar Bot

  • Montreal Jar Bot (CA007025257) is a weather station in Quebec, Canada at 45.57 latitude and -73.55 longitude, 46 m (151 ft) above sea level.
  • The station reports from 1948 to 1989, 42 years of record.
  • 1,464 records set at Montreal Jar Bot still stand.
  • Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
  • Montreal Jar Bot set a daily record low minimum temperature of -27.5 C (-17.5 F) on 21 December 1983.

About the Station

  • Location: Quebec, Canada, 45.57 latitude, -73.55 longitude.
  • Elevation: 46 m (151 ft).
  • Period of record: 1948 to 1989, 42 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 Montreal Jar Bot, with 2026 drawn through them The band shows the record high and record low for each calendar day at Montreal Jar Bot. 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 Montreal Jar Bot. 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 Montreal Jar Bot, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan13.3 C (55.9 F)-35.0 C (-31.0 F)n/an/a
Feb18.0 C (64.4 F)-35.0 C (-31.0 F)n/an/a
Mar21.1 C (70.0 F)-28.3 C (-18.9 F)n/an/a
Apr28.9 C (84.0 F)-15.6 C (3.9 F)n/an/a
May33.3 C (91.9 F)-5.0 C (23.0 F)n/an/a
Jun34.0 C (93.2 F)1.1 C (34.0 F)n/an/a
Jul36.1 C (97.0 F)5.5 C (41.9 F)n/an/a
Aug35.6 C (96.1 F)3.9 C (39.0 F)n/an/a
Sep32.2 C (90.0 F)-4.0 C (24.8 F)n/an/a
Oct29.4 C (84.9 F)-6.7 C (19.9 F)n/an/a
Nov22.2 C (72.0 F)-17.8 C (0.0 F)n/an/a
Dec16.1 C (61.0 F)-32.0 C (-25.6 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Montreal Jar Bot by the year they were set 1,464 records at Montreal Jar Bot still stand. 1950 holds the most, with 70. 0204060801948: 241949: 571950: 701951: 531952: 231953: 511954: 371955: 401956: 471957: 521958: 251959: 571960: 181961: 311962: 301963: 401964: 431965: 371966: 411967: 401968: 411969: 231970: 341971: 281972: 321973: 321974: 391975: 341976: 521977: 481978: 351979: 561980: 421981: 651982: 541983: 33194819521956196019641968197219761980
1,464 records at Montreal Jar Bot still stand. 1950 holds the most, with 70.
Standing records at Montreal Jar Bot by the year they were set
Year setStanding records
194824
194957
195070
195153
195223
195351
195437
195540
195647
195752
195825
195957
196018
196131
196230
196340
196443
196537
196641
196740
196841
196923
197034
197128
197232
197332
197439
197534
197652
197748
197835
197956
198042
198165
198254
198333

Wettest Day of Each Month

Jul: 87.1 mm (3.4 in)
Record daily precipitation for each month at Montreal Jar Bot The wettest day on record for each calendar month at Montreal Jar Bot. The most was 87.1 mm (3.4 in) on 5 July 1958. 0255075100 Jan: 49.8 mm (2.0 in), 8 January 1978 Jan Feb: 47.8 mm (1.9 in), 2 February 1983 Feb Mar: 41.9 mm (1.6 in), 17 March 1973 Mar Apr: 52.1 mm (2.1 in), 24 April 1968 Apr May: 40.6 mm (1.6 in), 2 May 1949 May Jun: 63.8 mm (2.5 in), 25 June 1957 Jun Jul: 87.1 mm (3.4 in), 5 July 1958 Jul Aug: 72.1 mm (2.8 in), 18 August 1969 Aug Sep: 74.2 mm (2.9 in), 12 September 1963 Sep Oct: 48.0 mm (1.9 in), 22 October 1970 Oct Nov: 45.7 mm (1.8 in), 3 November 1951 Nov Dec: 46.7 mm (1.8 in), 26 December 1957 Dec
The wettest day on record for each calendar month at Montreal Jar Bot. The most was 87.1 mm (3.4 in) on 5 July 1958.
Record daily precipitation for each month at Montreal Jar Bot
MonthRecord daily precipitation (mm)Date
Jan49.8 mm (2.0 in)8 January 1978
Feb47.8 mm (1.9 in)2 February 1983
Mar41.9 mm (1.6 in)17 March 1973
Apr52.1 mm (2.1 in)24 April 1968
May40.6 mm (1.6 in)2 May 1949
Jun63.8 mm (2.5 in)25 June 1957
Jul87.1 mm (3.4 in)5 July 1958
Aug72.1 mm (2.8 in)18 August 1969
Sep74.2 mm (2.9 in)12 September 1963
Oct48.0 mm (1.9 in)22 October 1970
Nov45.7 mm (1.8 in)3 November 1951
Dec46.7 mm (1.8 in)26 December 1957

Period of Record Coverage

1948 to 1983
Days with data per year at Montreal Jar Bot 36 years of record at Montreal Jar Bot, 1948 to 1983. 3 years have data for under 90 percent of days and are left out of rankings: 1948, 1972, 1980. 1948: 180 of 366 days1949: 349 of 365 days1950: 355 of 365 days1951: 349 of 365 days1952: 356 of 366 days1953: 357 of 365 days1954: 357 of 365 days1955: 362 of 365 days1956: 359 of 366 days1957: 363 of 365 days1958: 348 of 365 days1959: 364 of 365 days1960: 364 of 366 days1961: 363 of 365 days1962: 333 of 365 days1963: 364 of 365 days1964: 349 of 366 days1965: 332 of 365 days1966: 364 of 365 days1967: 361 of 365 days1968: 365 of 366 days1969: 340 of 365 days1970: 365 of 365 days1971: 365 of 365 days1972: 323 of 366 days1973: 365 of 365 days1974: 365 of 365 days1975: 365 of 365 days1976: 364 of 366 days1977: 363 of 365 days1978: 364 of 365 days1979: 364 of 365 days1980: 322 of 366 days1981: 363 of 365 days1982: 365 of 365 days1983: 365 of 365 days1950195519601965197019751980
36 years of record at Montreal Jar Bot, 1948 to 1983. 3 years have data for under 90 percent of days and are left out of rankings: 1948, 1972, 1980.
Days with data per year at Montreal Jar Bot
YearDays with dataShare of yearComplete
194818049%No
194934996%Yes
195035597%Yes
195134996%Yes
195235697%Yes
195335798%Yes
195435798%Yes
195536299%Yes
195635998%Yes
195736399%Yes
195834895%Yes
1959364100%Yes
196036499%Yes
196136399%Yes
196233391%Yes
1963364100%Yes
196434995%Yes
196533291%Yes
1966364100%Yes
196736199%Yes
1968365100%Yes
196934093%Yes
1970365100%Yes
1971365100%Yes
197232388%No
1973365100%Yes
1974365100%Yes
1975365100%Yes
197636499%Yes
197736399%Yes
1978364100%Yes
1979364100%Yes
198032288%No
198136399%Yes
1982365100%Yes
1983365100%Yes

Latest Records

20
Latest records at Montreal Jar Bot
DateStationRecordValueBeat old record byOld record stoodSignificance
21 December 1983Montreal Jar Bot, CAdaily low min-27.5 C (-17.5 F)0.3 C (0.5 F)24 years10 of 100 (Routine)
12 December 1983Montreal Jar Bot, CAdaily rain30.4 mm (1.2 in)5.0 mm (0.20 in)32 years19 of 100 (Routine)
6 December 1983Montreal Jar Bot, CAdaily rain27.8 mm (1.1 in)5.4 mm (0.21 in)30 years20 of 100 (Routine)
24 November 1983Montreal Jar Bot, CAdaily rain17.0 mm (0.7 in)0.6 mm (0.02 in)2 years3 of 100 (Routine)
20 November 1983Montreal Jar Bot, CAdaily rain26.0 mm (1.0 in)0.9 mm (0.04 in)8 years6 of 100 (Routine)
16 November 1983Montreal Jar Bot, CAdaily snowfall6.6 cm (2.6 in)2.0 cm (0.8 in)16 years10 of 100 (Routine)
15 November 1983Montreal Jar Bot, CAdaily snowfall12.0 cm (4.7 in)1.8 cm (0.7 in)14 years9 of 100 (Routine)
13 November 1983Montreal Jar Bot, CAdaily low max-1.5 C (29.3 F)0.4 C (0.7 F)20 years9 of 100 (Routine)
11 November 1983Montreal Jar Bot, CAdaily snowfall2.0 cm (0.8 in)1.0 cm (0.4 in)6 years6 of 100 (Routine)
5 November 1983Montreal Jar Bot, CAdaily rain29.6 mm (1.2 in)8.5 mm (0.33 in)32 years23 of 100 (Routine)
23 October 1983Montreal Jar Bot, CAdaily low min-2.0 C (28.4 F)0.9 C (1.6 F)18 years9 of 100 (Routine)
13 October 1983Montreal Jar Bot, CAdaily high max25.0 C (77.0 F)1.7 C (3.1 F)28 years14 of 100 (Routine)
13 October 1983Montreal Jar Bot, CAdaily high min13.0 C (55.4 F)0.8 C (1.4 F)12 years7 of 100 (Routine)
8 October 1983Montreal Jar Bot, CAdaily rain19.0 mm (0.7 in)2.7 mm (0.11 in)32 years15 of 100 (Routine)
4 October 1983Montreal Jar Bot, CAdaily rain30.4 mm (1.2 in)14.1 mm (0.6 in)28 years30 of 100 (Routine)
21 September 1983Montreal Jar Bot, CAdaily rain33.0 mm (1.3 in)2.8 mm (0.11 in)24 years12 of 100 (Routine)
20 September 1983Montreal Jar Bot, CAdaily high max31.5 C (88.7 F)3.2 C (5.8 F)17 years14 of 100 (Routine)
10 September 1983Montreal Jar Bot, CAdaily high min (Tie)20.0 C (68.0 F)tie21 years2 of 100 (Routine)
6 September 1983Montreal Jar Bot, CAdaily high max32.0 C (89.6 F)0.9 C (1.6 F)34 years14 of 100 (Routine)
6 September 1983Montreal Jar Bot, CAdaily high min22.5 C (72.5 F)3.1 C (5.6 F)13 years13 of 100 (Routine)

Climate Trend

30 complete years, 1949 to 1983
Annual mean temperature at Montreal Jar Bot as warming stripes, 1949 to 1983 One stripe for each of 30 complete years at Montreal Jar Bot, 1949 to 1983. Blue stripes are years cooler than the station's own mean of 6.6 C (44.0 F); red stripes are warmer. The coolest year was 1963, at 5.8 C (42.4 F), and the warmest was 1953, at 8.0 C (46.5 F). The strongest colour marks a difference of 1.4 C (2.5 F). 1949: 7.4 C, +0.8 C from the station mean1950: 5.9 C, -0.8 C from the station mean1951: 6.3 C, -0.3 C from the station mean1952: 7.3 C, +0.6 C from the station mean1953: 8.0 C, +1.4 C from the station mean1954: 6.1 C, -0.5 C from the station mean1955: 6.9 C, +0.2 C from the station mean1956: 6.0 C, -0.6 C from the station mean1957: 7.2 C, +0.5 C from the station mean1958: 5.8 C, -0.8 C from the station mean1959: 6.5 C, -0.1 C from the station mean1960: 6.8 C, +0.1 C from the station mean1961: 6.6 C, 0.0 C from the station mean1963: 5.8 C, -0.9 C from the station mean1964: 7.0 C, +0.3 C from the station mean1966: 6.7 C, 0.0 C from the station mean1967: 6.2 C, -0.5 C from the station mean1968: 6.2 C, -0.5 C from the station mean1970: 6.3 C, -0.4 C from the station mean1971: 6.3 C, -0.3 C from the station mean1973: 7.5 C, +0.9 C from the station mean1974: 6.2 C, -0.4 C from the station mean1975: 7.4 C, +0.7 C from the station mean1976: 5.8 C, -0.9 C from the station mean1977: 6.8 C, +0.2 C from the station mean1978: 6.0 C, -0.6 C from the station mean1979: 7.1 C, +0.5 C from the station mean1981: 7.3 C, +0.7 C from the station mean1982: 6.5 C, -0.1 C from the station mean1983: 7.3 C, +0.7 C from the station mean1949195519601965197019751980
One stripe for each of 30 complete years at Montreal Jar Bot, 1949 to 1983. Blue stripes are years cooler than the station's own mean of 6.6 C (44.0 F); red stripes are warmer. The coolest year was 1963, at 5.8 C (42.4 F), and the warmest was 1953, at 8.0 C (46.5 F). The strongest colour marks a difference of 1.4 C (2.5 F).
Annual mean temperature at Montreal Jar Bot as warming stripes, 1949 to 1983
YearAnnual mean temperatureDifference from the station mean
19497.4 C+0.79 C
19505.9 C-0.79 C
19516.3 C-0.31 C
19527.3 C+0.64 C
19538.0 C+1.39 C
19546.1 C-0.52 C
19556.9 C+0.21 C
19566.0 C-0.61 C
19577.2 C+0.54 C
19585.8 C-0.80 C
19596.5 C-0.11 C
19606.8 C+0.14 C
19616.6 C-0.03 C
19635.8 C-0.85 C
19647.0 C+0.33 C
19666.7 C+0.03 C
19676.2 C-0.47 C
19686.2 C-0.46 C
19706.3 C-0.38 C
19716.3 C-0.32 C
19737.5 C+0.87 C
19746.2 C-0.40 C
19757.4 C+0.72 C
19765.8 C-0.85 C
19776.8 C+0.20 C
19786.0 C-0.61 C
19797.1 C+0.47 C
19817.3 C+0.68 C
19826.5 C-0.14 C
19837.3 C+0.66 C

The fitted trend in annual mean temperature here over 1949 to 1983 is 0.02 C (-0.20 to 0.24) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.04 F (-0.36 to 0.43) per decade. The slope is a straight line fitted to 30 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Montreal Jar Bot
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.02 C (-0.20 to 0.24) per decade0.04 F (-0.36 to 0.43) per decade1949 to 198330Not clearly different from zero
Mean daily maximum0.02 C (-0.22 to 0.25) per decade0.03 F (-0.39 to 0.46) per decade1949 to 198330Not clearly different from zero
Mean daily minimum0.02 C (-0.20 to 0.25) per decade0.04 F (-0.36 to 0.45) per decade1949 to 198330Not clearly different from zero

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

1948 to 1983
Yearly extremes at Montreal Jar Bot: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)36.1 C (97.0 F)195533.3 C (91.9 F)36
Coldest night (TNn)-35.0 C (-31.0 F)1951-28.3 C (-18.9 F)36
Wettest day (Rx1day)87.1 mm (3.4 in)195846.2 mm (1.8 in)36
Wettest five days (Rx5day)118.6 mm (4.7 in)195873.5 mm (2.9 in)36
Longest dry spell (CDD)22 days197716 days36

Hottest day (TXx)

Hottest day (TXx) at Montreal Jar Bot by year The hottest day of the year at Montreal Jar Bot, 1948 to 1983. The record is 36.1 C (97.0 F) in 1955, marked on the chart; the median year is 33.3 C (91.9 F). 30323436381950196019701980Record: 36.1 C (97.0 F) in 1955
The hottest day of the year at Montreal Jar Bot, 1948 to 1983. The record is 36.1 C (97.0 F) in 1955, marked on the chart; the median year is 33.3 C (91.9 F).
Hottest day (TXx) at Montreal Jar Bot by year
YearHottest day (TXx)
194834.4 C (93.9 F)
194935.0 C (95.0 F)
195032.8 C (91.0 F)
195131.7 C (89.1 F)
195233.3 C (91.9 F)
195335.0 C (95.0 F)
195430.6 C (87.1 F)
195536.1 C (97.0 F)
195632.8 C (91.0 F)
195733.9 C (93.0 F)
195831.1 C (88.0 F)
195934.4 C (93.9 F)
196032.2 C (90.0 F)
196131.1 C (88.0 F)
196233.3 C (91.9 F)
196334.4 C (93.9 F)
196434.4 C (93.9 F)
196532.2 C (90.0 F)
196633.9 C (93.0 F)
196731.1 C (88.0 F)
196832.8 C (91.0 F)
196933.3 C (91.9 F)
197032.8 C (91.0 F)
197133.3 C (91.9 F)
197232.2 C (90.0 F)
197332.2 C (90.0 F)
197431.1 C (88.0 F)
197535.6 C (96.1 F)
197631.7 C (89.1 F)
197733.3 C (91.9 F)
197834.4 C (93.9 F)
197933.9 C (93.0 F)
198033.0 C (91.4 F)
198133.5 C (92.3 F)
198236.0 C (96.8 F)
198335.5 C (95.9 F)

Coldest night (TNn)

Coldest night (TNn) at Montreal Jar Bot by year The coldest night of the year at Montreal Jar Bot, 1948 to 1983. The record is -35.0 C (-31.0 F) in 1951, marked on the chart; the median year is -28.3 C (-18.9 F). -35-30-25-201950196019701980Record: -35.0 C (-31.0 F) in 1951
The coldest night of the year at Montreal Jar Bot, 1948 to 1983. The record is -35.0 C (-31.0 F) in 1951, marked on the chart; the median year is -28.3 C (-18.9 F).
Coldest night (TNn) at Montreal Jar Bot by year
YearColdest night (TNn)
1948-22.8 C (-9.0 F)
1949-24.4 C (-11.9 F)
1950-28.3 C (-18.9 F)
1951-35.0 C (-31.0 F)
1952-25.6 C (-14.1 F)
1953-23.3 C (-9.9 F)
1954-30.0 C (-22.0 F)
1955-31.1 C (-24.0 F)
1956-24.4 C (-11.9 F)
1957-35.0 C (-31.0 F)
1958-27.8 C (-18.0 F)
1959-28.9 C (-20.0 F)
1960-28.3 C (-18.9 F)
1961-27.2 C (-17.0 F)
1962-32.8 C (-27.0 F)
1963-28.9 C (-20.0 F)
1964-24.4 C (-11.9 F)
1965-23.3 C (-9.9 F)
1966-28.3 C (-18.9 F)
1967-28.9 C (-20.0 F)
1968-30.0 C (-22.0 F)
1969-24.4 C (-11.9 F)
1970-27.8 C (-18.0 F)
1971-31.1 C (-24.0 F)
1972-30.0 C (-22.0 F)
1973-28.9 C (-20.0 F)
1974-27.2 C (-17.0 F)
1975-27.8 C (-18.0 F)
1976-33.3 C (-27.9 F)
1977-24.4 C (-11.9 F)
1978-28.9 C (-20.0 F)
1979-28.3 C (-18.9 F)
1980-32.0 C (-25.6 F)
1981-35.0 C (-31.0 F)
1982-28.5 C (-19.3 F)
1983-27.5 C (-17.5 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Montreal Jar Bot by year The wettest day of the year at Montreal Jar Bot, 1948 to 1983. The record is 87.1 mm (3.4 in) in 1958, marked on the chart; the median year is 46.2 mm (1.8 in). 204060801001950196019701980Record: 87.1 mm (3.4 in) in 1958
The wettest day of the year at Montreal Jar Bot, 1948 to 1983. The record is 87.1 mm (3.4 in) in 1958, marked on the chart; the median year is 46.2 mm (1.8 in).
Wettest day (Rx1day) at Montreal Jar Bot by year
YearWettest day (Rx1day)
194836.8 mm (1.4 in)
194969.3 mm (2.7 in)
195037.1 mm (1.5 in)
195145.7 mm (1.8 in)
195259.4 mm (2.3 in)
195335.6 mm (1.4 in)
195439.9 mm (1.6 in)
195535.3 mm (1.4 in)
195647.8 mm (1.9 in)
195763.8 mm (2.5 in)
195887.1 mm (3.4 in)
195938.1 mm (1.5 in)
196039.1 mm (1.5 in)
196155.1 mm (2.2 in)
196233.8 mm (1.3 in)
196374.2 mm (2.9 in)
196442.7 mm (1.7 in)
196540.9 mm (1.6 in)
196646.2 mm (1.8 in)
196742.9 mm (1.7 in)
196852.1 mm (2.1 in)
196972.1 mm (2.8 in)
197048.0 mm (1.9 in)
197139.6 mm (1.6 in)
197236.6 mm (1.4 in)
197346.5 mm (1.8 in)
197446.2 mm (1.8 in)
197562.0 mm (2.4 in)
197643.2 mm (1.7 in)
197735.6 mm (1.4 in)
197859.4 mm (2.3 in)
197965.8 mm (2.6 in)
198039.5 mm (1.6 in)
198156.6 mm (2.2 in)
198271.6 mm (2.8 in)
198347.8 mm (1.9 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Montreal Jar Bot by year The wettest five days of the year at Montreal Jar Bot, 1948 to 1983. The record is 118.6 mm (4.7 in) in 1958, marked on the chart; the median year is 73.5 mm (2.9 in). 4060801001201950196019701980Record: 118.6 mm (4.7 in) in 1958
The wettest five days of the year at Montreal Jar Bot, 1948 to 1983. The record is 118.6 mm (4.7 in) in 1958, marked on the chart; the median year is 73.5 mm (2.9 in).
Wettest five days (Rx5day) at Montreal Jar Bot by year
YearWettest five days (Rx5day)
194858.7 mm (2.3 in)
194985.6 mm (3.4 in)
195067.7 mm (2.7 in)
195179.7 mm (3.1 in)
195276.0 mm (3.0 in)
195361.0 mm (2.4 in)
195490.2 mm (3.6 in)
195572.9 mm (2.9 in)
195678.6 mm (3.1 in)
1957102.7 mm (4.0 in)
1958118.6 mm (4.7 in)
195961.8 mm (2.4 in)
196073.7 mm (2.9 in)
196164.7 mm (2.5 in)
196262.8 mm (2.5 in)
196374.5 mm (2.9 in)
196461.8 mm (2.4 in)
196570.6 mm (2.8 in)
196659.0 mm (2.3 in)
196766.6 mm (2.6 in)
196860.5 mm (2.4 in)
196993.4 mm (3.7 in)
197055.1 mm (2.2 in)
197173.2 mm (2.9 in)
197250.8 mm (2.0 in)
197375.7 mm (3.0 in)
197453.7 mm (2.1 in)
197592.7 mm (3.6 in)
197659.6 mm (2.3 in)
197757.4 mm (2.3 in)
197885.3 mm (3.4 in)
197988.2 mm (3.5 in)
198091.5 mm (3.6 in)
198186.7 mm (3.4 in)
198280.4 mm (3.2 in)
198386.0 mm (3.4 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Montreal Jar Bot by year The longest dry spell of the year at Montreal Jar Bot, 1948 to 1983. The record is 22 days in 1977, marked on the chart; the median year is 16 days. 101520251950196019701980Record: 22 days in 1977
The longest dry spell of the year at Montreal Jar Bot, 1948 to 1983. The record is 22 days in 1977, marked on the chart; the median year is 16 days.
Longest dry spell (CDD) at Montreal Jar Bot by year
YearLongest dry spell (CDD)
194815 days
194918 days
195016 days
195114 days
195212 days
195316 days
195414 days
195514 days
195615 days
195717 days
195810 days
195917 days
196014 days
196116 days
196216 days
196319 days
196416 days
196517 days
196612 days
196718 days
196818 days
196913 days
197017 days
197111 days
197210 days
197314 days
197410 days
197512 days
197612 days
197722 days
197816 days
197916 days
198019 days
198110 days
198214 days
198317 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

30 years with a frost

Across 30 years with a frost, the median last spring frost at Montreal Jar Bot falls on 4 May and the median first autumn frost on 10 October, which leaves a median of 164 days between them.

Fitted over all years, the growing season changes by +2.8 days per decade at this station.

Frost dates and growing season at Montreal Jar Bot
MeasureMedian, all yearsEarliest periodRecent period (1949 to 1983)Recent against earliestFitted trend
Last spring frost4 Mayn/a4 Mayn/a-1.2 days per decade
First autumn frost10 Octobern/a10 Octobern/a+1.6 days per decade
Growing days164 daysn/a164 daysn/a+2.8 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

31 years, 1949 to 1983

A day with at least 47.7 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 91.6 mm (3.6 in) of rain is expected about once in 100 years.

Rainfall return levels at Montreal Jar Bot: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years47.7 mm (1.9 in)
5 years59.2 mm (2.3 in)
10 years66.9 mm (2.6 in)
25 years76.8 mm (3.0 in)
50 years84.2 mm (3.3 in)Longer than the 31 years of record
100 years91.6 mm (3.6 in)Longer than the 31 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, 31 years of values from 1949 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: 74.2 mm (2.9 in) in 1963; 72.1 mm (2.8 in) in 1969; 71.6 mm (2.8 in) in 1982.

Download the Data

  • Data for Montreal Jar Bot standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Montreal Jar Bot 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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-17).