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Built 2026-10-18 (18 October 2026)

Blue Hills Threshold Days by Year

5 fixed thresholds counted per year at Blue Hills (ASN00039148): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Blue Hills Thresholds

  • Blue Hills: days with 10 mm (0.39 in) or more of precipitation in 33 years, most in 1983 with 35.
  • Blue Hills: days with 25 mm (0.98 in) or more of precipitation in 33 years, most in 1971 with 18.
  • Blue Hills: days with 50 mm (1.97 in) or more of precipitation in 25 years, most in 1983 with 6.
  • Blue Hills: days with 100 mm (3.94 in) or more of precipitation in 5 years, most in 1977 with 3.
  • 5 fixed thresholds have at least one qualifying day at Blue Hills.
33 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Blue Hills Days per year at Blue Hills with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 35 in 1983. 0102030401959: 191960: 191962: 291963: 181964: 151966: 301967: 261968: 221969: 201970: 181971: 331972: 251974: 251975: 251976: 271977: 211978: 211979: 221980: 181981: 191982: 141983: 351984: 201985: 231986: 191987: 201988: 211989: 331991: 201992: 181993: 221994: 151997: 11195919641969197419781982198619911997
Days per year at Blue Hills with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 35 in 1983.
Days with 10 mm (0.39 in) or more of precipitation per year at Blue Hills
YearDaysDecade average
19591919
19601922.4
19622922.4
19631822.4
19641522.4
19663022.4
19672622.4
19682222.4
19692022.4
19701824.1
19713324.1
19722524.1
19742524.1
19752524.1
19762724.1
19772124.1
19782124.1
19792224.1
19801822.2
19811922.2
19821422.2
19833522.2
19842022.2
19852322.2
19861922.2
19872022.2
19882122.2
19893322.2
19912017.2
19921817.2
19932217.2
19941517.2
19971117.2
First to last qualifying date each year at Blue Hills For each year, a bar from the first to the last day at Blue Hills meeting 10 mm (0.39 in). 1959: 2 January 1959 to 26 December 19591960: 6 January 1960 to 27 December 19601962: 3 January 1962 to 30 December 19621963: 1 January 1963 to 15 August 19631964: 2 January 1964 to 27 August 19641966: 27 January 1966 to 31 December 19661967: 1 January 1967 to 26 December 19671968: 1 January 1968 to 27 December 19681969: 6 February 1969 to 29 December 19691970: 7 January 1970 to 30 December 19701971: 12 January 1971 to 30 December 19711972: 18 January 1972 to 31 December 19721974: 1 January 1974 to 27 December 19741975: 4 January 1975 to 25 December 19751976: 7 January 1976 to 23 December 19761977: 2 January 1977 to 19 December 19771978: 6 January 1978 to 30 December 19781979: 20 January 1979 to 25 December 19791980: 6 January 1980 to 26 December 19801981: 1 January 1981 to 30 November 19811982: 6 January 1982 to 11 December 19821983: 1 January 1983 to 18 December 19831984: 2 January 1984 to 18 December 19841985: 24 January 1985 to 27 December 19851986: 10 January 1986 to 23 December 19861987: 4 January 1987 to 1 December 19871988: 7 February 1988 to 19 December 19881989: 1 February 1989 to 20 November 19891991: 3 January 1991 to 21 December 19911992: 1 January 1992 to 26 December 19921993: 6 January 1993 to 24 November 19931994: 8 January 1994 to 26 December 19941997: 16 May 1997 to 25 December 19971959196619711977198219871993JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Blue Hills meeting 10 mm (0.39 in).
First to last qualifying date each year at Blue Hills
YearFirst dateLast date
19591959-01-021959-12-26
19601960-01-061960-12-27
19621962-01-031962-12-30
19631963-01-011963-08-15
19641964-01-021964-08-27
19661966-01-271966-12-31
19671967-01-011967-12-26
19681968-01-011968-12-27
19691969-02-061969-12-29
19701970-01-071970-12-30
19711971-01-121971-12-30
19721972-01-181972-12-31
19741974-01-011974-12-27
19751975-01-041975-12-25
19761976-01-071976-12-23
19771977-01-021977-12-19
19781978-01-061978-12-30
19791979-01-201979-12-25
19801980-01-061980-12-26
19811981-01-011981-11-30
19821982-01-061982-12-11
19831983-01-011983-12-18
19841984-01-021984-12-18
19851985-01-241985-12-27
19861986-01-101986-12-23
19871987-01-041987-12-01
19881988-02-071988-12-19
19891989-02-011989-11-20
19911991-01-031991-12-21
19921992-01-011992-12-26
19931993-01-061993-11-24
19941994-01-081994-12-26
19971997-05-161997-12-25

Every Fixed Threshold

Fixed thresholds at Blue Hills
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3335198311
25 mm (0.98 in): Days with 25 mm or more rain331819714
50 mm (1.97 in): Days with 50 mm or more rain25619831
100 mm (3.94 in): Days with 100 mm or more rain5319771
200 mm (7.87 in): Days with 200 mm or more rain1119881

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1959.

Download the Data

  • Data for Blue Hills 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).