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Built 2026-10-19 (19 October 2026)

Alliston Nelson Threshold Days by Year (CA006110218)

14 fixed thresholds counted per year at Alliston Nelson (CA006110218): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Alliston Nelson Thresholds

  • Alliston Nelson: days with 10 mm (0.39 in) or more of precipitation in 10 years, most in 1982 with 33.
  • Alliston Nelson: days with 25 mm (0.98 in) or more of precipitation in 10 years, most in 1980 with 6.
  • Alliston Nelson: days with 10 cm (3.9 in) or more of snowfall in 9 years, most in 1976 with 6.
  • Alliston Nelson: days with a maximum temperature at or above 30 C (86 F) in 6 years, most in 1983 with 34.
  • 14 fixed thresholds have at least one qualifying day at Alliston Nelson.
6 years with a qualifying day
Days at or above 30 C (86 F) per year at Alliston Nelson Days per year at Alliston Nelson with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 34 in 1983. 0102030401978: 231979: 161980: 141981: 61982: 81983: 34197819791980198119821983
Days per year at Alliston Nelson with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 34 in 1983.
Days at or above 30 C (86 F) per year at Alliston Nelson
YearDaysDecade average
19782319.5
19791619.5
19801415.5
1981615.5
1982815.5
19833415.5
First to last qualifying date each year at Alliston Nelson For each year, a bar from the first to the last day at Alliston Nelson meeting 30 C (86 F). 1978: 26 May 1978 to 19 August 19781979: 9 May 1979 to 1 September 19791980: 22 May 1980 to 27 August 19801981: 15 June 1981 to 13 July 19811982: 6 July 1982 to 13 September 19821983: 12 June 1983 to 10 September 1983197819791980198119821983JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Alliston Nelson meeting 30 C (86 F).
First to last qualifying date each year at Alliston Nelson
YearFirst dateLast date
19781978-05-261978-08-19
19791979-05-091979-09-01
19801980-05-221980-08-27
19811981-06-151981-07-13
19821982-07-061982-09-13
19831983-06-121983-09-10

Every Fixed Threshold

Fixed thresholds at Alliston Nelson
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days634198334
35 C (95 F): Days1119831
90 F (32.2 C): Days3519835
0 C (32 F): Ice days (max689197858
0 C (32 F): Frost days (min61691978156
-10 C (14 F): Days with min674197841
-20 C (-4 F): Days with min61619798
-30 C (-22 F): Days with min4219811
20 C (68 F): Tropical nights (min610198310
10 mm (0.39 in): Days with 10 mm or more rain1033198224
25 mm (0.98 in): Days with 25 mm or more rain10619802
50 mm (1.97 in): Days with 50 mm or more rain6219762
10 cm (3.9 in): Days with 10 cm or more snowfall9619764
25 cm (9.8 in): Days with 25 cm or more snowfall2119752

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1978.

Download the Data

  • Data for Alliston Nelson 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).