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Data as of 2025-12-31
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Built 2026-10-15 (15 October 2026)

Dundas Threshold Days by Year

3 fixed thresholds counted per year at Dundas (ASN00012139): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Dundas Thresholds

  • Dundas: days with 10 mm (0.39 in) or more of precipitation in 15 years, most in 1918 with 15.
  • Dundas: days with 25 mm (0.98 in) or more of precipitation in 9 years, most in 1917 with 3.
  • Dundas: days with 50 mm (1.97 in) or more of precipitation in 2 years, most in 1913 with 1.
  • 3 fixed thresholds have at least one qualifying day at Dundas.
15 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Dundas Days per year at Dundas with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 15 in 1918. 0510151912: 21913: 71914: 51915: 131916: 81917: 101918: 151919: 101920: 71921: 111922: 91923: 31924: 31925: 81926: 519121914191619181920192219241926
Days per year at Dundas with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 15 in 1918.
Days with 10 mm (0.39 in) or more of precipitation per year at Dundas
YearDaysDecade average
191228.8
191378.8
191458.8
1915138.8
191688.8
1917108.8
1918158.8
1919108.8
192076.6
1921116.6
192296.6
192336.6
192436.6
192586.6
192656.6
First to last qualifying date each year at Dundas For each year, a bar from the first to the last day at Dundas meeting 10 mm (0.39 in). 1912: 17 May 1912 to 4 July 19121913: 17 March 1913 to 20 December 19131914: 6 January 1914 to 13 November 19141915: 1 January 1915 to 1 August 19151916: 21 January 1916 to 8 November 19161917: 19 March 1917 to 18 November 19171918: 2 January 1918 to 30 November 19181919: 31 March 1919 to 10 December 19191920: 24 February 1920 to 22 October 19201921: 25 January 1921 to 9 December 19211922: 17 April 1922 to 16 December 19221923: 26 April 1923 to 13 December 19231924: 6 April 1924 to 18 October 19241925: 18 February 1925 to 10 December 19251926: 10 March 1926 to 19 November 192619121914191619181920192219241926JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Dundas meeting 10 mm (0.39 in).
First to last qualifying date each year at Dundas
YearFirst dateLast date
19121912-05-171912-07-04
19131913-03-171913-12-20
19141914-01-061914-11-13
19151915-01-011915-08-01
19161916-01-211916-11-08
19171917-03-191917-11-18
19181918-01-021918-11-30
19191919-03-311919-12-10
19201920-02-241920-10-22
19211921-01-251921-12-09
19221922-04-171922-12-16
19231923-04-261923-12-13
19241924-04-061924-10-18
19251925-02-181925-12-10
19261926-03-101926-11-19

Every Fixed Threshold

Fixed thresholds at Dundas
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain151519185
25 mm (0.98 in): Days with 25 mm or more rain9319171
50 mm (1.97 in): Days with 50 mm or more rain2119131

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1912.

Download the Data

  • Data for Dundas 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 2026-10-13 (13 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).