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Built 2026-10-19 (19 October 2026)

Port Hope Threshold Days by Year (CA006156670)

17 fixed thresholds counted per year at Port Hope (CA006156670): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Port Hope Thresholds

  • Port Hope: days with 10 mm (0.39 in) or more of precipitation in 41 years, most in 1891 with 38.
  • Port Hope: days with 25 mm (0.98 in) or more of precipitation in 41 years, most in 1885 with 9.
  • Port Hope: days with 10 cm (3.9 in) or more of snowfall in 40 years, most in 1883 with 10.
  • Port Hope: days with a maximum temperature at or below 0 C (32 F) in 32 years, most in 1904 with 88.
  • 17 fixed thresholds have at least one qualifying day at Port Hope.
26 years with a qualifying day
Days at or above 30 C (86 F) per year at Port Hope Days per year at Port Hope with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 49 in 1898. 02040601898: 491899: 161900: 201901: 201902: 11903: 41904: 11905: 31906: 21907: 21908: 61909: 31964: 11966: 51968: 31969: 11970: 21971: 41972: 11973: 41975: 51977: 31978: 21979: 11981: 21983: 5189819011904190719641969197219771981
Days per year at Port Hope with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 49 in 1898.
Days at or above 30 C (86 F) per year at Port Hope
YearDaysDecade average
18984932.5
18991632.5
1900206.2
1901206.2
190216.2
190346.2
190416.2
190536.2
190626.2
190726.2
190866.2
190936.2
196412.5
196652.5
196832.5
196912.5
197022.8
197142.8
197212.8
197342.8
197552.8
197732.8
197822.8
197912.8
198123.5
198353.5
First to last qualifying date each year at Port Hope For each year, a bar from the first to the last day at Port Hope meeting 30 C (86 F). 1898: 2 June 1898 to 15 September 18981899: 6 June 1899 to 30 August 18991900: 24 June 1900 to 6 September 19001901: 24 June 1901 to 4 September 19011902: 8 July 1902 to 8 July 19021903: 8 July 1903 to 23 July 19031904: 18 July 1904 to 18 July 19041905: 17 July 1905 to 19 July 19051906: 5 August 1906 to 7 September 19061907: 18 June 1907 to 12 August 19071908: 6 July 1908 to 10 September 19081909: 1 July 1909 to 10 August 19091964: 28 July 1964 to 28 July 19641966: 24 June 1966 to 2 September 19661968: 22 July 1968 to 20 August 19681969: 17 July 1969 to 17 July 19691970: 1 August 1970 to 12 August 19701971: 29 June 1971 to 20 August 19711972: 21 July 1972 to 21 July 19721973: 28 August 1973 to 4 September 19731975: 23 June 1975 to 2 August 19751977: 28 May 1977 to 21 July 19771978: 29 June 1978 to 20 July 19781979: 15 July 1979 to 15 July 19791981: 9 July 1981 to 13 July 19811983: 14 June 1983 to 16 July 19831898190219061964197019751981JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Port Hope meeting 30 C (86 F).
First to last qualifying date each year at Port Hope
YearFirst dateLast date
18981898-06-021898-09-15
18991899-06-061899-08-30
19001900-06-241900-09-06
19011901-06-241901-09-04
19021902-07-081902-07-08
19031903-07-081903-07-23
19041904-07-181904-07-18
19051905-07-171905-07-19
19061906-08-051906-09-07
19071907-06-181907-08-12
19081908-07-061908-09-10
19091909-07-011909-08-10
19641964-07-281964-07-28
19661966-06-241966-09-02
19681968-07-221968-08-20
19691969-07-171969-07-17
19701970-08-011970-08-12
19711971-06-291971-08-20
19721972-07-211972-07-21
19731973-08-281973-09-04
19751975-06-231975-08-02
19771977-05-281977-07-21
19781978-06-291978-07-20
19791979-07-151979-07-15
19811981-07-091981-07-13
19831983-06-141983-07-16

Every Fixed Threshold

Fixed thresholds at Port Hope
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days264918985
35 C (95 F): Days4918981
90 F (32.2 C): Days103018982
100 F (37.8 C): Days2218981
0 C (32 F): Ice days (max3288190445
0 C (32 F): Frost days (min321751904125
-10 C (14 F): Days with min3294190433
-20 C (-4 F): Days with min323319042
-30 C (-22 F): Days with min4319041
20 C (68 F): Tropical nights (min2815197312
10 mm (0.39 in): Days with 10 mm or more rain4138189131
25 mm (0.98 in): Days with 25 mm or more rain41918853
50 mm (1.97 in): Days with 50 mm or more rain16219802
100 mm (3.94 in): Days with 100 mm or more rain10n/a1
10 cm (3.9 in): Days with 10 cm or more snowfall401018831
25 cm (9.8 in): Days with 25 cm or more snowfall14318871
50 cm (19.7 in): Days with 50 cm or more snowfall1118841

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1898.

Download the Data

  • Data for Port Hope 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).