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Data as of 2026-10-15
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Built 2026-10-17 (17 October 2026)

Grand Valley Weather Records (CA006142990)

Record envelope, standing records and threshold days for Grand Valley (CA006142990), Ontario, Canada, with 30 years of record.

Key Facts for Grand Valley

  • Grand Valley (CA006142990) is a weather station in Ontario, Canada at 43.88 latitude and -80.35 longitude, 470 m (1,542 ft) above sea level.
  • The station reports from 1910 to 1939, 30 years of record.
  • 1,464 records set at Grand Valley 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, 43.88 latitude, -80.35 longitude.
  • Elevation: 470 m (1,542 ft).
  • Period of record: 1910 to 1939, 30 years.
  • Eligible elements: none yet.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Grand Valley, with 2026 drawn through them The band shows the record high and record low for each calendar day at Grand Valley. 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 Grand Valley. 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 Grand Valley, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan6.7 C (44.1 F)-30.6 C (-23.1 F)n/an/a
Feb6.7 C (44.1 F)-31.7 C (-25.1 F)n/an/a
Mar20.6 C (69.1 F)-27.8 C (-18.0 F)n/an/a
Apr26.1 C (79.0 F)-10.6 C (12.9 F)n/an/a
May31.7 C (89.1 F)-3.3 C (26.1 F)n/an/a
Jun32.8 C (91.0 F)1.1 C (34.0 F)n/an/a
Jul37.8 C (100.0 F)2.2 C (36.0 F)n/an/a
Aug33.3 C (91.9 F)0.0 C (32.0 F)n/an/a
Sep34.4 C (93.9 F)-4.4 C (24.1 F)n/an/a
Oct27.8 C (82.0 F)-8.3 C (17.1 F)n/an/a
Nov20.0 C (68.0 F)-23.9 C (-11.0 F)n/an/a
Dec10.0 C (50.0 F)-30.0 C (-22.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Grand Valley by the year they were set 1,464 records at Grand Valley still stand. 1936 holds the most, with 335. 01002003004001934: 1961935: 2671936: 3351937: 2581938: 2521939: 156193419351936193719381939
1,464 records at Grand Valley still stand. 1936 holds the most, with 335.
Standing records at Grand Valley by the year they were set
Year setStanding records
1934196
1935267
1936335
1937258
1938252
1939156

Wettest Day of Each Month

Jun: 87.9 mm (3.5 in)
Record daily precipitation for each month at Grand Valley The wettest day on record for each calendar month at Grand Valley. The most was 87.9 mm (3.5 in) on 28 June 1939. 0255075100 Jan: 27.9 mm (1.1 in), 8 January 1937 Jan Feb: 18.5 mm (0.7 in), 20 February 1937 Feb Mar: 29.5 mm (1.2 in), 24 March 1913 Mar Apr: 35.3 mm (1.4 in), 20 April 1910 Apr May: 42.7 mm (1.7 in), 28 May 1935 May Jun: 87.9 mm (3.5 in), 28 June 1939 Jun Jul: 33.0 mm (1.3 in), 12 July 1939 Jul Aug: 45.7 mm (1.8 in), 8 August 1939 Aug Sep: 42.2 mm (1.7 in), 1 September 1912 Sep Oct: 30.5 mm (1.2 in), 19 October 1917 Oct Nov: 60.2 mm (2.4 in), 4 November 1935 Nov Dec: 29.7 mm (1.2 in), 26 December 1936 Dec
The wettest day on record for each calendar month at Grand Valley. The most was 87.9 mm (3.5 in) on 28 June 1939.
Record daily precipitation for each month at Grand Valley
MonthRecord daily precipitation (mm)Date
Jan27.9 mm (1.1 in)8 January 1937
Feb18.5 mm (0.7 in)20 February 1937
Mar29.5 mm (1.2 in)24 March 1913
Apr35.3 mm (1.4 in)20 April 1910
May42.7 mm (1.7 in)28 May 1935
Jun87.9 mm (3.5 in)28 June 1939
Jul33.0 mm (1.3 in)12 July 1939
Aug45.7 mm (1.8 in)8 August 1939
Sep42.2 mm (1.7 in)1 September 1912
Oct30.5 mm (1.2 in)19 October 1917
Nov60.2 mm (2.4 in)4 November 1935
Dec29.7 mm (1.2 in)26 December 1936

Period of Record Coverage

1934 to 1939
Days with data per year at Grand Valley 6 years of record at Grand Valley, 1934 to 1939. 2 years have data for under 90 percent of days and are left out of rankings: 1934, 1939. 1934: 240 of 365 days1935: 359 of 365 days1936: 363 of 366 days1937: 349 of 365 days1938: 346 of 365 days1939: 270 of 365 days1935
6 years of record at Grand Valley, 1934 to 1939. 2 years have data for under 90 percent of days and are left out of rankings: 1934, 1939.
Days with data per year at Grand Valley
YearDays with dataShare of yearComplete
193424066%No
193535998%Yes
193636399%Yes
193734996%Yes
193834695%Yes
193927074%No

Latest Records

0

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

Extremes by Year

1910 to 1939
Yearly extremes at Grand Valley: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)37.8 C (100.0 F)193633.3 C (91.9 F)6
Coldest night (TNn)-31.7 C (-25.1 F)1936-29.1 C (-20.5 F)6
Wettest day (Rx1day)87.9 mm (3.5 in)193937.6 mm (1.5 in)14
Wettest five days (Rx5day)118.4 mm (4.7 in)193956.4 mm (2.2 in)14
Longest dry spell (CDD)28 days193517 days14

Hottest day (TXx)

Hottest day (TXx) at Grand Valley by year The hottest day of the year at Grand Valley, 1910 to 1939. The record is 37.8 C (100.0 F) in 1936, marked on the chart; the median year is 33.3 C (91.9 F). 3032343638191019151920192519301935Record: 37.8 C (100.0 F) in 1936
The hottest day of the year at Grand Valley, 1910 to 1939. The record is 37.8 C (100.0 F) in 1936, marked on the chart; the median year is 33.3 C (91.9 F).
Hottest day (TXx) at Grand Valley by year
YearHottest day (TXx)
1910n/a
1911n/a
1912n/a
1913n/a
1914n/a
1915n/a
1916n/a
1917n/a
193433.3 C (91.9 F)
193531.7 C (89.1 F)
193637.8 C (100.0 F)
193733.3 C (91.9 F)
193832.2 C (90.0 F)
193934.4 C (93.9 F)

Coldest night (TNn)

Coldest night (TNn) at Grand Valley by year The coldest night of the year at Grand Valley, 1910 to 1939. The record is -31.7 C (-25.1 F) in 1936, marked on the chart; the median year is -29.1 C (-20.5 F). -32-30-28-26-24191019151920192519301935Record: -31.7 C (-25.1 F) in 1936
The coldest night of the year at Grand Valley, 1910 to 1939. The record is -31.7 C (-25.1 F) in 1936, marked on the chart; the median year is -29.1 C (-20.5 F).
Coldest night (TNn) at Grand Valley by year
YearColdest night (TNn)
1910n/a
1911n/a
1912n/a
1913n/a
1914n/a
1915n/a
1916n/a
1917n/a
1934-25.0 C (-13.0 F)
1935-31.1 C (-24.0 F)
1936-31.7 C (-25.1 F)
1937-28.3 C (-18.9 F)
1938-25.6 C (-14.1 F)
1939-30.0 C (-22.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Grand Valley by year The wettest day of the year at Grand Valley, 1910 to 1939. The record is 87.9 mm (3.5 in) in 1939, marked on the chart; the median year is 37.6 mm (1.5 in). 20406080100191019151920192519301935Record: 87.9 mm (3.5 in) in 1939
The wettest day of the year at Grand Valley, 1910 to 1939. The record is 87.9 mm (3.5 in) in 1939, marked on the chart; the median year is 37.6 mm (1.5 in).
Wettest day (Rx1day) at Grand Valley by year
YearWettest day (Rx1day)
191035.3 mm (1.4 in)
191127.7 mm (1.1 in)
191242.2 mm (1.7 in)
191332.5 mm (1.3 in)
191427.7 mm (1.1 in)
191544.5 mm (1.8 in)
191629.2 mm (1.1 in)
191731.8 mm (1.3 in)
193438.1 mm (1.5 in)
193560.2 mm (2.4 in)
193643.9 mm (1.7 in)
193744.7 mm (1.8 in)
193837.1 mm (1.5 in)
193987.9 mm (3.5 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Grand Valley by year The wettest five days of the year at Grand Valley, 1910 to 1939. The record is 118.4 mm (4.7 in) in 1939, marked on the chart; the median year is 56.4 mm (2.2 in). 406080100120191019151920192519301935Record: 118.4 mm (4.7 in) in 1939
The wettest five days of the year at Grand Valley, 1910 to 1939. The record is 118.4 mm (4.7 in) in 1939, marked on the chart; the median year is 56.4 mm (2.2 in).
Wettest five days (Rx5day) at Grand Valley by year
YearWettest five days (Rx5day)
191048.2 mm (1.9 in)
191153.6 mm (2.1 in)
191271.2 mm (2.8 in)
191357.9 mm (2.3 in)
191449.0 mm (1.9 in)
191563.8 mm (2.5 in)
191648.8 mm (1.9 in)
191754.9 mm (2.2 in)
193444.2 mm (1.7 in)
1935111.0 mm (4.4 in)
193681.2 mm (3.2 in)
193747.7 mm (1.9 in)
193876.2 mm (3.0 in)
1939118.4 mm (4.7 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Grand Valley by year The longest dry spell of the year at Grand Valley, 1910 to 1939. The record is 28 days in 1935, marked on the chart; the median year is 17 days. 1015202530191019151920192519301935Record: 28 days in 1935
The longest dry spell of the year at Grand Valley, 1910 to 1939. The record is 28 days in 1935, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Grand Valley by year
YearLongest dry spell (CDD)
191017 days
191115 days
191217 days
191326 days
191417 days
191512 days
191621 days
191725 days
193417 days
193528 days
193625 days
193715 days
193813 days
193914 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 Grand Valley standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Grand Valley 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).