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Built 2026-10-19 (19 October 2026)

William Head Threshold Days by Year (CA001018935)

8 fixed thresholds counted per year at William Head (CA001018935): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for William Head Thresholds

  • William Head: nights with a minimum temperature at or below 0 C (32 F) in 23 years, most in 1982 with 54.
  • William Head: days with 10 mm (0.39 in) or more of precipitation in 19 years, most in 1967 with 34.
  • William Head: days with 25 mm (0.98 in) or more of precipitation in 18 years, most in 1967 with 9.
  • William Head: days with a maximum temperature at or below 0 C (32 F) in 11 years, most in 1969 with 10.
  • 8 fixed thresholds have at least one qualifying day at William Head.
23 years with a qualifying day
Nights at or below 0 C (32 F) per year at William Head Days per year at William Head with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 54 in 1982. 02040601960: 131961: 91963: 311964: 301965: 321966: 251967: 211968: 211969: 231970: 121971: 411972: 461973: 151974: 211975: 371976: 181977: 241978: 261979: 211980: 301981: 141982: 541983: 2619601964196719701973197619791982
Days per year at William Head with nights with a minimum temperature at or below 0 C (32 F), with the decade average as a line. The most was 54 in 1982.
Nights at or below 0 C (32 F) per year at William Head
YearDaysDecade average
19601322.8
1961922.8
19633122.8
19643022.8
19653222.8
19662522.8
19672122.8
19682122.8
19692322.8
19701226.1
19714126.1
19724626.1
19731526.1
19742126.1
19753726.1
19761826.1
19772426.1
19782626.1
19792126.1
19803031
19811431
19825431
19832631
First to last qualifying date each year at William Head For each year, a bar from the first to the last day at William Head meeting 0 C (32 F). 1960: 1 January 1960 to 4 March 19601961: 12 February 1961 to 17 December 19611963: 10 January 1963 to 13 December 19631964: 6 January 1964 to 31 December 19641965: 1 January 1965 to 31 December 19651966: 1 January 1966 to 27 December 19661967: 5 January 1967 to 21 December 19671968: 2 January 1968 to 31 December 19681969: 1 January 1969 to 12 March 19691970: 15 January 1970 to 23 December 19701971: 1 January 1971 to 31 December 19711972: 1 January 1972 to 13 December 19721973: 3 January 1973 to 5 November 19731974: 2 January 1974 to 23 December 19741975: 7 January 1975 to 31 December 19751976: 1 January 1976 to 27 November 19761977: 4 January 1977 to 10 December 19771978: 1 January 1978 to 31 December 19781979: 1 January 1979 to 22 December 19791980: 5 January 1980 to 9 December 19801981: 4 February 1981 to 31 December 19811982: 1 January 1982 to 31 December 19821983: 14 January 1983 to 30 December 198319601964196719701973197619791982JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at William Head meeting 0 C (32 F).
First to last qualifying date each year at William Head
YearFirst dateLast date
19601960-01-011960-03-04
19611961-02-121961-12-17
19631963-01-101963-12-13
19641964-01-061964-12-31
19651965-01-011965-12-31
19661966-01-011966-12-27
19671967-01-051967-12-21
19681968-01-021968-12-31
19691969-01-011969-03-12
19701970-01-151970-12-23
19711971-01-011971-12-31
19721972-01-011972-12-13
19731973-01-031973-11-05
19741974-01-021974-12-23
19751975-01-071975-12-31
19761976-01-011976-11-27
19771977-01-041977-12-10
19781978-01-011978-12-31
19791979-01-011979-12-22
19801980-01-051980-12-09
19811981-02-041981-12-31
19821982-01-011982-12-31
19831983-01-141983-12-30

Every Fixed Threshold

Fixed thresholds at William Head
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days1119601
0 C (32 F): Ice days (max111019694
0 C (32 F): Frost days (min2354198226
-10 C (14 F): Days with min2419684
10 mm (0.39 in): Days with 10 mm or more rain1934196730
25 mm (0.98 in): Days with 25 mm or more rain18919672
50 mm (1.97 in): Days with 50 mm or more rain10319601
10 cm (3.9 in): Days with 10 cm or more snowfall7219681

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1960.

Download the Data

  • Data for William Head 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).