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Built 2026-10-17 (17 October 2026)

Alliston Nelson Weather Records (CA006110218)

Record envelope, standing records and threshold days for Alliston Nelson (CA006110218), Ontario, Canada, with 34 years of record.

Key Facts for Alliston Nelson

  • Alliston Nelson (CA006110218) is a weather station in Ontario, Canada at 44.15 latitude and -79.87 longitude, 221 m (725 ft) above sea level.
  • The station reports from 1973 to 2006, 34 years of record.
  • 1,464 records set at Alliston Nelson 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, 44.15 latitude, -79.87 longitude.
  • Elevation: 221 m (725 ft).
  • Period of record: 1973 to 2006, 34 years.
  • Eligible elements: none yet.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Alliston Nelson, with 2026 drawn through them The band shows the record high and record low for each calendar day at Alliston Nelson. 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 Alliston Nelson. 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 Alliston Nelson, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan10.0 C (50.0 F)-32.5 C (-26.5 F)n/an/a
Feb11.0 C (51.8 F)-34.0 C (-29.2 F)n/an/a
Mar20.0 C (68.0 F)-28.0 C (-18.4 F)n/an/a
Apr25.5 C (77.9 F)-12.0 C (10.4 F)n/an/a
May32.5 C (90.5 F)-2.5 C (27.5 F)n/an/a
Jun33.0 C (91.4 F)1.0 C (33.8 F)n/an/a
Jul35.0 C (95.0 F)4.5 C (40.1 F)n/an/a
Aug33.5 C (92.3 F)2.5 C (36.5 F)n/an/a
Sep33.0 C (91.4 F)-1.5 C (29.3 F)n/an/a
Oct28.0 C (82.4 F)-6.0 C (21.2 F)n/an/a
Nov22.0 C (71.6 F)-13.5 C (7.7 F)n/an/a
Dec20.0 C (68.0 F)-32.0 C (-25.6 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Alliston Nelson by the year they were set 1,464 records at Alliston Nelson still stand. 1979 holds the most, with 240. 01002003001977: 1481978: 2241979: 2401980: 2211981: 2061982: 2031983: 2221977197819791980198119821983
1,464 records at Alliston Nelson still stand. 1979 holds the most, with 240.
Standing records at Alliston Nelson by the year they were set
Year setStanding records
1977148
1978224
1979240
1980221
1981206
1982203
1983222

Wettest Day of Each Month

Jul: 94.7 mm (3.7 in)
Record daily precipitation for each month at Alliston Nelson The wettest day on record for each calendar month at Alliston Nelson. The most was 94.7 mm (3.7 in) on 2 July 1974. 0255075100 Jan: 20.0 mm (0.8 in), 25 January 1978 Jan Feb: 24.6 mm (1.0 in), 24 February 1975 Feb Mar: 35.1 mm (1.4 in), 4 March 1974 Mar Apr: 30.8 mm (1.2 in), 14 April 1980 Apr May: 31.0 mm (1.2 in), 31 May 1977 May Jun: 38.9 mm (1.5 in), 13 June 1976 Jun Jul: 94.7 mm (3.7 in), 2 July 1974 Jul Aug: 63.0 mm (2.5 in), 16 August 1977 Aug Sep: 74.6 mm (2.9 in), 14 September 1982 Sep Oct: 24.0 mm (0.9 in), 1 October 1977 Oct Nov: 29.8 mm (1.2 in), 1 November 1982 Nov Dec: 32.2 mm (1.3 in), 24 December 1979 Dec
The wettest day on record for each calendar month at Alliston Nelson. The most was 94.7 mm (3.7 in) on 2 July 1974.
Record daily precipitation for each month at Alliston Nelson
MonthRecord daily precipitation (mm)Date
Jan20.0 mm (0.8 in)25 January 1978
Feb24.6 mm (1.0 in)24 February 1975
Mar35.1 mm (1.4 in)4 March 1974
Apr30.8 mm (1.2 in)14 April 1980
May31.0 mm (1.2 in)31 May 1977
Jun38.9 mm (1.5 in)13 June 1976
Jul94.7 mm (3.7 in)2 July 1974
Aug63.0 mm (2.5 in)16 August 1977
Sep74.6 mm (2.9 in)14 September 1982
Oct24.0 mm (0.9 in)1 October 1977
Nov29.8 mm (1.2 in)1 November 1982
Dec32.2 mm (1.3 in)24 December 1979

Period of Record Coverage

1977 to 1983
Days with data per year at Alliston Nelson 7 years of record at Alliston Nelson, 1977 to 1983. 1 years have data for under 90 percent of days and are left out of rankings: 1977. 1977: 245 of 365 days1978: 365 of 365 days1979: 365 of 365 days1980: 365 of 366 days1981: 365 of 365 days1982: 365 of 365 days1983: 365 of 365 days1980
7 years of record at Alliston Nelson, 1977 to 1983. 1 years have data for under 90 percent of days and are left out of rankings: 1977.
Days with data per year at Alliston Nelson
YearDays with dataShare of yearComplete
197724567%No
1978365100%Yes
1979365100%Yes
1980365100%Yes
1981365100%Yes
1982365100%Yes
1983365100%Yes

Latest Records

0

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

Extremes by Year

1973 to 1983
Yearly extremes at Alliston Nelson: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)35.0 C (95.0 F)198332.5 C (90.5 F)7
Coldest night (TNn)-34.0 C (-29.2 F)1979-30.0 C (-22.0 F)7
Wettest day (Rx1day)94.7 mm (3.7 in)197460.4 mm (2.4 in)11
Wettest five days (Rx5day)114.0 mm (4.5 in)197465.9 mm (2.6 in)11
Longest dry spell (CDD)27 days197813 days11

Hottest day (TXx)

Hottest day (TXx) at Alliston Nelson by year The hottest day of the year at Alliston Nelson, 1973 to 1983. The record is 35.0 C (95.0 F) in 1983, marked on the chart; the median year is 32.5 C (90.5 F). 313233343519751980Record: 35.0 C (95.0 F) in 1983
The hottest day of the year at Alliston Nelson, 1973 to 1983. The record is 35.0 C (95.0 F) in 1983, marked on the chart; the median year is 32.5 C (90.5 F).
Hottest day (TXx) at Alliston Nelson by year
YearHottest day (TXx)
1973n/a
1974n/a
1975n/a
1976n/a
197734.0 C (93.2 F)
197834.0 C (93.2 F)
197932.0 C (89.6 F)
198032.0 C (89.6 F)
198132.5 C (90.5 F)
198231.5 C (88.7 F)
198335.0 C (95.0 F)

Coldest night (TNn)

Coldest night (TNn) at Alliston Nelson by year The coldest night of the year at Alliston Nelson, 1973 to 1983. The record is -34.0 C (-29.2 F) in 1979, marked on the chart; the median year is -30.0 C (-22.0 F). -35-30-25-2019751980Record: -34.0 C (-29.2 F) in 1979
The coldest night of the year at Alliston Nelson, 1973 to 1983. The record is -34.0 C (-29.2 F) in 1979, marked on the chart; the median year is -30.0 C (-22.0 F).
Coldest night (TNn) at Alliston Nelson by year
YearColdest night (TNn)
1973n/a
1974n/a
1975n/a
1976n/a
1977-28.0 C (-18.4 F)
1978-27.5 C (-17.5 F)
1979-34.0 C (-29.2 F)
1980-32.0 C (-25.6 F)
1981-32.5 C (-26.5 F)
1982-30.0 C (-22.0 F)
1983-23.5 C (-10.3 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Alliston Nelson by year The wettest day of the year at Alliston Nelson, 1973 to 1983. The record is 94.7 mm (3.7 in) in 1974, marked on the chart; the median year is 60.4 mm (2.4 in). 2040608010019751980Record: 94.7 mm (3.7 in) in 1974
The wettest day of the year at Alliston Nelson, 1973 to 1983. The record is 94.7 mm (3.7 in) in 1974, marked on the chart; the median year is 60.4 mm (2.4 in).
Wettest day (Rx1day) at Alliston Nelson by year
YearWettest day (Rx1day)
197331.2 mm (1.2 in)
197494.7 mm (3.7 in)
197537.6 mm (1.5 in)
197668.6 mm (2.7 in)
197763.0 mm (2.5 in)
197834.6 mm (1.4 in)
197932.2 mm (1.3 in)
198078.0 mm (3.1 in)
198160.4 mm (2.4 in)
198274.6 mm (2.9 in)
198337.4 mm (1.5 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Alliston Nelson by year The wettest five days of the year at Alliston Nelson, 1973 to 1983. The record is 114.0 mm (4.5 in) in 1974, marked on the chart; the median year is 65.9 mm (2.6 in). 40608010012019751980Record: 114.0 mm (4.5 in) in 1974
The wettest five days of the year at Alliston Nelson, 1973 to 1983. The record is 114.0 mm (4.5 in) in 1974, marked on the chart; the median year is 65.9 mm (2.6 in).
Wettest five days (Rx5day) at Alliston Nelson by year
YearWettest five days (Rx5day)
197365.9 mm (2.6 in)
1974114.0 mm (4.5 in)
197558.4 mm (2.3 in)
197692.9 mm (3.7 in)
1977101.6 mm (4.0 in)
197865.6 mm (2.6 in)
197958.4 mm (2.3 in)
1980108.6 mm (4.3 in)
198162.4 mm (2.5 in)
198290.8 mm (3.6 in)
198360.2 mm (2.4 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Alliston Nelson by year The longest dry spell of the year at Alliston Nelson, 1973 to 1983. The record is 27 days in 1978, marked on the chart; the median year is 13 days. 101520253019751980Record: 27 days in 1978
The longest dry spell of the year at Alliston Nelson, 1973 to 1983. The record is 27 days in 1978, marked on the chart; the median year is 13 days.
Longest dry spell (CDD) at Alliston Nelson by year
YearLongest dry spell (CDD)
197320 days
197413 days
197513 days
197612 days
197713 days
197827 days
197916 days
198012 days
198111 days
198211 days
198312 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 Alliston Nelson standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Alliston Nelson 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 . Last revised (2026-10-16).