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Built 2026-10-19 (19 October 2026)

Cornwall Ont Hydro Threshold Days by Year (CA006101901)

16 fixed thresholds counted per year at Cornwall Ont Hydro (CA006101901): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Cornwall Ont Hydro Thresholds

  • Cornwall Ont Hydro: days with a maximum temperature at or above 30 C (86 F) in 26 years, most in 1955 with 41.
  • Cornwall Ont Hydro: days with a maximum temperature at or below 0 C (32 F) in 26 years, most in 1978 with 97.
  • Cornwall Ont Hydro: nights with a minimum temperature at or below 0 C (32 F) in 26 years, most in 1978 with 168.
  • Cornwall Ont Hydro: nights with a minimum temperature at or below -10 C (14 F) in 26 years, most in 1978 with 89.
  • 16 fixed thresholds have at least one qualifying day at Cornwall Ont Hydro.
26 years with a qualifying day
Days at or above 30 C (86 F) per year at Cornwall Ont Hydro Days per year at Cornwall Ont Hydro with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 41 in 1955. 02040601955: 411956: 71957: 131958: 61959: 261960: 111961: 71962: 71963: 191964: 151965: 91966: 141967: 41968: 71969: 121970: 131971: 131973: 181974: 41975: 141977: 61978: 181980: 101981: 111982: 81983: 26195519581961196419671970197419781982
Days per year at Cornwall Ont Hydro with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 41 in 1955.
Days at or above 30 C (86 F) per year at Cornwall Ont Hydro
YearDaysDecade average
19554118.6
1956718.6
19571318.6
1958618.6
19592618.6
19601110.5
1961710.5
1962710.5
19631910.5
19641510.5
1965910.5
19661410.5
1967410.5
1968710.5
19691210.5
19701312.3
19711312.3
19731812.3
1974412.3
19751412.3
1977612.3
19781812.3
19801013.8
19811113.8
1982813.8
19832613.8
First to last qualifying date each year at Cornwall Ont Hydro For each year, a bar from the first to the last day at Cornwall Ont Hydro meeting 30 C (86 F). 1955: 6 June 1955 to 19 September 19551956: 12 June 1956 to 9 August 19561957: 15 June 1957 to 9 August 19571958: 14 July 1958 to 31 August 19581959: 9 June 1959 to 10 September 19591960: 28 June 1960 to 9 September 19601961: 15 May 1961 to 11 September 19611962: 17 May 1962 to 31 August 19621963: 4 June 1963 to 3 August 19631964: 9 June 1964 to 31 August 19641965: 7 June 1965 to 22 September 19651966: 24 May 1966 to 9 August 19661967: 3 June 1967 to 8 August 19671968: 1 July 1968 to 22 July 19681969: 12 June 1969 to 31 August 19691970: 10 June 1970 to 16 August 19701971: 19 May 1971 to 19 August 19711973: 11 June 1973 to 5 September 19731974: 10 June 1974 to 22 August 19741975: 20 May 1975 to 26 August 19751977: 21 May 1977 to 29 August 19771978: 27 May 1978 to 16 August 19781980: 24 June 1980 to 24 August 19801981: 16 June 1981 to 19 July 19811982: 7 May 1982 to 22 July 19821983: 12 June 1983 to 20 September 19831955195919631967197119771982JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Cornwall Ont Hydro meeting 30 C (86 F).
First to last qualifying date each year at Cornwall Ont Hydro
YearFirst dateLast date
19551955-06-061955-09-19
19561956-06-121956-08-09
19571957-06-151957-08-09
19581958-07-141958-08-31
19591959-06-091959-09-10
19601960-06-281960-09-09
19611961-05-151961-09-11
19621962-05-171962-08-31
19631963-06-041963-08-03
19641964-06-091964-08-31
19651965-06-071965-09-22
19661966-05-241966-08-09
19671967-06-031967-08-08
19681968-07-011968-07-22
19691969-06-121969-08-31
19701970-06-101970-08-16
19711971-05-191971-08-19
19731973-06-111973-09-05
19741974-06-101974-08-22
19751975-05-201975-08-26
19771977-05-211977-08-29
19781978-05-271978-08-16
19801980-06-241980-08-24
19811981-06-161981-07-19
19821982-05-071982-07-22
19831983-06-121983-09-20

Every Fixed Threshold

Fixed thresholds at Cornwall Ont Hydro
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2641195526
35 C (95 F): Days3519551
90 F (32.2 C): Days171419554
0 C (32 F): Ice days (max2697197870
0 C (32 F): Frost days (min261681978154
-10 C (14 F): Days with min2689197855
-20 C (-4 F): Days with min2629196812
-30 C (-22 F): Days with min14319683
20 C (68 F): Tropical nights (min2622197314
25 C (77 F): Days with min1119591
10 mm (0.39 in): Days with 10 mm or more rain2246197738
25 mm (0.98 in): Days with 25 mm or more rain22919697
50 mm (1.97 in): Days with 50 mm or more rain7219691
10 cm (3.9 in): Days with 10 cm or more snowfall221519773
25 cm (9.8 in): Days with 25 cm or more snowfall9419711
50 cm (19.7 in): Days with 50 cm or more snowfall1119751

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1955.

Download the Data

  • Data for Cornwall Ont Hydro 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). Threshold counts are computed by this site.

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