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Built 2026-10-19 (19 October 2026)

Block Island State AP Threshold Days by Year (USW00094793)

14 fixed thresholds counted per year at Block Island State AP (USW00094793): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Block Island State AP Thresholds

  • Block Island State AP: days with a maximum temperature at or below 0 C (32 F) in 46 years, most in 1977 with 41.
  • Block Island State AP: nights with a minimum temperature at or below 0 C (32 F) in 46 years, most in 1970 with 104.
  • Block Island State AP: nights with a minimum temperature at or below -10 C (14 F) in 46 years, most in 1968 with 25.
  • Block Island State AP: nights with a minimum temperature at or above 20 C (68 F) in 45 years, most in 1979 with 32.
  • 14 fixed thresholds have at least one qualifying day at Block Island State AP.
32 years with a qualifying day
Days at or above 30 C (86 F) per year at Block Island State AP Days per year at Block Island State AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 10 in 1952. 0358101949: 61951: 11952: 101953: 61955: 51956: 21957: 31959: 11961: 11962: 11963: 31966: 11968: 21971: 11972: 51973: 11975: 31976: 31977: 41978: 11979: 11980: 11982: 11983: 61984: 21985: 11987: 21990: 61991: 21993: 52025: 42026: 319491955196119681975197919841991
Days per year at Block Island State AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 10 in 1952.
Days at or above 30 C (86 F) per year at Block Island State AP
YearDaysDecade average
194966
195114
1952104
195364
195554
195624
195734
195914
196111.6
196211.6
196331.6
196611.6
196821.6
197112.4
197252.4
197312.4
197532.4
197632.4
197742.4
197812.4
197912.4
198012.2
198212.2
198362.2
198422.2
198512.2
198722.2
199064.3
199124.3
199354.3
202543.5
202633.5
First to last qualifying date each year at Block Island State AP For each year, a bar from the first to the last day at Block Island State AP meeting 30 C (86 F). 1949: 5 July 1949 to 11 August 19491951: 27 July 1951 to 27 July 19511952: 25 June 1952 to 28 July 19521953: 17 July 1953 to 2 September 19531955: 3 July 1955 to 2 August 19551956: 15 June 1956 to 16 June 19561957: 16 June 1957 to 21 July 19571959: 21 August 1959 to 21 August 19591961: 26 July 1961 to 26 July 19611962: 8 August 1962 to 8 August 19621963: 28 June 1963 to 28 July 19631966: 3 July 1966 to 3 July 19661968: 17 July 1968 to 21 August 19681971: 8 July 1971 to 8 July 19711972: 18 July 1972 to 26 August 19721973: 31 August 1973 to 31 August 19731975: 1 August 1975 to 3 August 19751976: 26 June 1976 to 22 August 19761977: 18 July 1977 to 11 August 19771978: 23 July 1978 to 23 July 19781979: 2 August 1979 to 2 August 19791980: 7 August 1980 to 7 August 19801982: 13 July 1982 to 13 July 19821983: 13 June 1983 to 11 September 19831984: 2 August 1984 to 4 August 19841985: 21 July 1985 to 21 July 19851987: 21 July 1987 to 18 August 19871990: 5 July 1990 to 1 September 19901991: 29 June 1991 to 21 July 19911993: 8 July 1993 to 27 August 19932025: 24 June 2025 to 30 July 20252026: 3 July 2026 to 7 August 202619491955196119681975197919841991JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Block Island State AP meeting 30 C (86 F).
First to last qualifying date each year at Block Island State AP
YearFirst dateLast date
19491949-07-051949-08-11
19511951-07-271951-07-27
19521952-06-251952-07-28
19531953-07-171953-09-02
19551955-07-031955-08-02
19561956-06-151956-06-16
19571957-06-161957-07-21
19591959-08-211959-08-21
19611961-07-261961-07-26
19621962-08-081962-08-08
19631963-06-281963-07-28
19661966-07-031966-07-03
19681968-07-171968-08-21
19711971-07-081971-07-08
19721972-07-181972-08-26
19731973-08-311973-08-31
19751975-08-011975-08-03
19761976-06-261976-08-22
19771977-07-181977-08-11
19781978-07-231978-07-23
19791979-08-021979-08-02
19801980-08-071980-08-07
19821982-07-131982-07-13
19831983-06-131983-09-11
19841984-08-021984-08-04
19851985-07-211985-07-21
19871987-07-211987-08-18
19901990-07-051990-09-01
19911991-06-291991-07-21
19931993-07-081993-08-27
20252025-06-242025-07-30
20262026-07-032026-08-07

Every Fixed Threshold

Fixed thresholds at Block Island State AP
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days321019523
90 F (32.2 C): Days8219522
0 C (32 F): Ice days (max4641197722
0 C (32 F): Frost days (min46104197071
-10 C (14 F): Days with min4625196810
-20 C (-4 F): Days with min1219622
20 C (68 F): Tropical nights (min4532197920
10 mm (0.39 in): Days with 10 mm or more rain454319581
25 mm (0.98 in): Days with 25 mm or more rain441819589
50 mm (1.97 in): Days with 50 mm or more rain37819622
100 mm (3.94 in): Days with 100 mm or more rain6219601
10 cm (3.9 in): Days with 10 cm or more snowfall22519671
25 cm (9.8 in): Days with 25 cm or more snowfall3219562
50 cm (19.7 in): Days with 50 cm or more snowfall1119781

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1949.

Download the Data

  • Data for Block Island State AP 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).