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Data as of 2025-12-31
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Built 2026-10-18 (18 October 2026)

Glastonbury Threshold Days by Year

4 fixed thresholds counted per year at Glastonbury (ASN00040379): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Glastonbury Thresholds

  • Glastonbury: days with 10 mm (0.39 in) or more of precipitation in 17 years, most in 1974 with 42.
  • Glastonbury: days with 25 mm (0.98 in) or more of precipitation in 17 years, most in 1971 with 19.
  • Glastonbury: days with 50 mm (1.97 in) or more of precipitation in 17 years, most in 1974 with 7.
  • Glastonbury: days with 100 mm (3.94 in) or more of precipitation in 7 years, most in 1954 with 2.
  • 4 fixed thresholds have at least one qualifying day at Glastonbury.
17 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Glastonbury Days per year at Glastonbury with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 42 in 1974. 02040601954: 401959: 351960: 201961: 381962: 341963: 331964: 361966: 301967: 401968: 291969: 221970: 271971: 321972: 311973: 401974: 421975: 32195419601962196419671969197119731975
Days per year at Glastonbury with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 42 in 1974.
Days with 10 mm (0.39 in) or more of precipitation per year at Glastonbury
YearDaysDecade average
19544037.5
19593537.5
19602031.3
19613831.3
19623431.3
19633331.3
19643631.3
19663031.3
19674031.3
19682931.3
19692231.3
19702734
19713234
19723134
19734034
19744234
19753234
First to last qualifying date each year at Glastonbury For each year, a bar from the first to the last day at Glastonbury meeting 10 mm (0.39 in). 1954: 4 January 1954 to 19 December 19541959: 3 January 1959 to 22 December 19591960: 6 January 1960 to 15 December 19601961: 4 January 1961 to 29 December 19611962: 6 January 1962 to 31 December 19621963: 1 January 1963 to 14 December 19631964: 1 January 1964 to 30 December 19641966: 2 January 1966 to 31 December 19661967: 1 January 1967 to 9 December 19671968: 3 January 1968 to 5 December 19681969: 2 January 1969 to 31 December 19691970: 14 January 1970 to 26 December 19701971: 21 January 1971 to 28 December 19711972: 16 January 1972 to 29 December 19721973: 6 January 1973 to 21 December 19731974: 3 January 1974 to 29 December 19741975: 6 January 1975 to 24 December 1975195419611964196819711974JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Glastonbury meeting 10 mm (0.39 in).
First to last qualifying date each year at Glastonbury
YearFirst dateLast date
19541954-01-041954-12-19
19591959-01-031959-12-22
19601960-01-061960-12-15
19611961-01-041961-12-29
19621962-01-061962-12-31
19631963-01-011963-12-14
19641964-01-011964-12-30
19661966-01-021966-12-31
19671967-01-011967-12-09
19681968-01-031968-12-05
19691969-01-021969-12-31
19701970-01-141970-12-26
19711971-01-211971-12-28
19721972-01-161972-12-29
19731973-01-061973-12-21
19741974-01-031974-12-29
19751975-01-061975-12-24

Every Fixed Threshold

Fixed thresholds at Glastonbury
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain1742197432
25 mm (0.98 in): Days with 25 mm or more rain1719197112
50 mm (1.97 in): Days with 50 mm or more rain17719743
100 mm (3.94 in): Days with 100 mm or more rain7219541

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1954.

Download the Data

  • Data for Glastonbury 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 (2025-12-31).