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Built 2026-10-19 (19 October 2026)

Herrs Island Dam Threshold Days by Year (USC00363831)

3 fixed thresholds counted per year at Herrs Island Dam (USC00363831): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Herrs Island Dam Thresholds

  • Herrs Island Dam: days with 10 mm (0.39 in) or more of precipitation in 37 years, most in 1919 with 41.
  • Herrs Island Dam: days with 25 mm (0.98 in) or more of precipitation in 37 years, most in 1933 with 9.
  • Herrs Island Dam: days with 50 mm (1.97 in) or more of precipitation in 15 years, most in 1901 with 2.
  • 3 fixed thresholds have at least one qualifying day at Herrs Island Dam.
37 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Herrs Island Dam Days per year at Herrs Island Dam with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 41 in 1919. 02040601899: 301900: 251901: 301902: 291903: 341904: 351905: 301906: 221907: 311908: 311909: 301910: 301911: 341912: 301913: 341914: 231915: 341916: 251917: 341918: 261919: 411920: 251921: 291922: 291923: 371924: 341925: 261926: 311928: 311929: 341930: 201931: 271932: 211933: 311934: 331936: 291937: 331899190319071911191519191923192819321937
Days per year at Herrs Island Dam with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 41 in 1919.
Days with 10 mm (0.39 in) or more of precipitation per year at Herrs Island Dam
YearDaysDecade average
18993030
19002529.7
19013029.7
19022929.7
19033429.7
19043529.7
19053029.7
19062229.7
19073129.7
19083129.7
19093029.7
19103031.1
19113431.1
19123031.1
19133431.1
19142331.1
19153431.1
19162531.1
19173431.1
19182631.1
19194131.1
19202530.7
19212930.7
19222930.7
19233730.7
19243430.7
19252630.7
19263130.7
19283130.7
19293430.7
19302027.7
19312727.7
19322127.7
19333127.7
19343327.7
19362927.7
19373327.7
First to last qualifying date each year at Herrs Island Dam For each year, a bar from the first to the last day at Herrs Island Dam meeting 10 mm (0.39 in). 1899: 14 January 1899 to 15 December 18991900: 12 January 1900 to 5 December 19001901: 11 March 1901 to 20 December 19011902: 5 March 1902 to 16 December 19021903: 3 January 1903 to 20 December 19031904: 21 January 1904 to 27 December 19041905: 7 January 1905 to 29 December 19051906: 4 January 1906 to 6 December 19061907: 12 January 1907 to 23 December 19071908: 27 January 1908 to 7 December 19081909: 12 January 1909 to 14 December 19091910: 6 January 1910 to 30 December 19101911: 28 January 1911 to 31 December 19111912: 22 February 1912 to 6 December 19121913: 4 January 1913 to 26 December 19131914: 3 January 1914 to 21 December 19141915: 7 January 1915 to 30 December 19151916: 2 January 1916 to 27 December 19161917: 3 January 1917 to 30 October 19171918: 15 January 1918 to 25 December 19181919: 2 January 1919 to 14 December 19191920: 8 January 1920 to 2 December 19201921: 8 January 1921 to 24 December 19211922: 5 January 1922 to 17 December 19221923: 8 January 1923 to 31 December 19231924: 1 January 1924 to 17 December 19241925: 2 January 1925 to 6 December 19251926: 9 January 1926 to 26 December 19261928: 25 January 1928 to 15 December 19281929: 6 January 1929 to 13 December 19291930: 13 January 1930 to 6 December 19301931: 6 January 1931 to 25 December 19311932: 1 January 1932 to 31 December 19321933: 19 January 1933 to 26 December 19331934: 7 January 1934 to 26 December 19341936: 3 January 1936 to 20 December 19361937: 7 January 1937 to 18 December 193718991904190919141919192419301936JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Herrs Island Dam meeting 10 mm (0.39 in).
First to last qualifying date each year at Herrs Island Dam
YearFirst dateLast date
18991899-01-141899-12-15
19001900-01-121900-12-05
19011901-03-111901-12-20
19021902-03-051902-12-16
19031903-01-031903-12-20
19041904-01-211904-12-27
19051905-01-071905-12-29
19061906-01-041906-12-06
19071907-01-121907-12-23
19081908-01-271908-12-07
19091909-01-121909-12-14
19101910-01-061910-12-30
19111911-01-281911-12-31
19121912-02-221912-12-06
19131913-01-041913-12-26
19141914-01-031914-12-21
19151915-01-071915-12-30
19161916-01-021916-12-27
19171917-01-031917-10-30
19181918-01-151918-12-25
19191919-01-021919-12-14
19201920-01-081920-12-02
19211921-01-081921-12-24
19221922-01-051922-12-17
19231923-01-081923-12-31
19241924-01-011924-12-17
19251925-01-021925-12-06
19261926-01-091926-12-26
19281928-01-251928-12-15
19291929-01-061929-12-13
19301930-01-131930-12-06
19311931-01-061931-12-25
19321932-01-011932-12-31
19331933-01-191933-12-26
19341934-01-071934-12-26
19361936-01-031936-12-20
19371937-01-071937-12-18

Every Fixed Threshold

Fixed thresholds at Herrs Island Dam
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3741191933
25 mm (0.98 in): Days with 25 mm or more rain37919336
50 mm (1.97 in): Days with 50 mm or more rain15219011

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1899.

Download the Data

  • Data for Herrs Island Dam 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).