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Built 2026-10-16 (16 October 2026)

Toronto Wwtp Threshold Days by Year

5 fixed thresholds counted per year at Toronto Wwtp (ASN00061322): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Toronto Wwtp Thresholds

  • Toronto Wwtp: days with 10 mm (0.39 in) or more of precipitation in 26 years, most in 1989 with 52.
  • Toronto Wwtp: days with 25 mm (0.98 in) or more of precipitation in 26 years, most in 1990 with 20.
  • Toronto Wwtp: days with 50 mm (1.97 in) or more of precipitation in 25 years, most in 1974 with 11.
  • Toronto Wwtp: days with 100 mm (3.94 in) or more of precipitation in 11 years, most in 1990 with 3.
  • 5 fixed thresholds have at least one qualifying day at Toronto Wwtp.
26 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Toronto Wwtp Days per year at Toronto Wwtp with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 52 in 1989. 02040601973: 331974: 371975: 381977: 291978: 471979: 291980: 191981: 331982: 291983: 321984: 371985: 401986: 291987: 321988: 471989: 521990: 461991: 271992: 231993: 161994: 182000: 182001: 252003: 212004: 252008: 37197319771980198319861989199220002004
Days per year at Toronto Wwtp with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 52 in 1989.
Days with 10 mm (0.39 in) or more of precipitation per year at Toronto Wwtp
YearDaysDecade average
19733335.5
19743735.5
19753835.5
19772935.5
19784735.5
19792935.5
19801935
19813335
19822935
19833235
19843735
19854035
19862935
19873235
19884735
19895235
19904626
19912726
19922326
19931626
19941826
20001825.2
20012525.2
20032125.2
20042525.2
20083725.2
First to last qualifying date each year at Toronto Wwtp For each year, a bar from the first to the last day at Toronto Wwtp meeting 10 mm (0.39 in). 1973: 28 January 1973 to 27 December 19731974: 7 January 1974 to 29 December 19741975: 4 January 1975 to 24 December 19751977: 5 January 1977 to 26 December 19771978: 4 January 1978 to 29 December 19781979: 18 January 1979 to 25 November 19791980: 2 January 1980 to 31 December 19801981: 22 January 1981 to 27 December 19811982: 14 January 1982 to 4 December 19821983: 3 January 1983 to 27 December 19831984: 1 January 1984 to 30 December 19841985: 19 February 1985 to 8 December 19851986: 16 January 1986 to 19 December 19861987: 1 January 1987 to 30 December 19871988: 5 January 1988 to 27 December 19881989: 2 January 1989 to 12 December 19891990: 6 January 1990 to 11 December 19901991: 6 January 1991 to 29 December 19911992: 5 February 1992 to 22 December 19921993: 22 February 1993 to 8 December 19931994: 22 January 1994 to 1 December 19942000: 2 January 2000 to 7 December 20002001: 1 February 2001 to 21 November 20012003: 21 February 2003 to 12 December 20032004: 8 January 2004 to 2 December 20042008: 17 January 2008 to 30 December 20081973197819821986199019942004JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Toronto Wwtp meeting 10 mm (0.39 in).
First to last qualifying date each year at Toronto Wwtp
YearFirst dateLast date
19731973-01-281973-12-27
19741974-01-071974-12-29
19751975-01-041975-12-24
19771977-01-051977-12-26
19781978-01-041978-12-29
19791979-01-181979-11-25
19801980-01-021980-12-31
19811981-01-221981-12-27
19821982-01-141982-12-04
19831983-01-031983-12-27
19841984-01-011984-12-30
19851985-02-191985-12-08
19861986-01-161986-12-19
19871987-01-011987-12-30
19881988-01-051988-12-27
19891989-01-021989-12-12
19901990-01-061990-12-11
19911991-01-061991-12-29
19921992-02-051992-12-22
19931993-02-221993-12-08
19941994-01-221994-12-01
20002000-01-022000-12-07
20012001-02-012001-11-21
20032003-02-212003-12-12
20042004-01-082004-12-02
20082008-01-172008-12-30

Every Fixed Threshold

Fixed thresholds at Toronto Wwtp
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain2652198937
25 mm (0.98 in): Days with 25 mm or more rain2620199013
50 mm (1.97 in): Days with 50 mm or more rain251119743
100 mm (3.94 in): Days with 100 mm or more rain11319901
200 mm (7.87 in): Days with 200 mm or more rain2119811

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1973.

Download the Data

  • Data for Toronto Wwtp 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). Threshold counts are computed by this site.

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