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Built 2026-10-19 (19 October 2026)

Tappan Dam Threshold Days by Year (USC00338240)

6 fixed thresholds counted per year at Tappan Dam (USC00338240): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Tappan Dam Thresholds

  • Tappan Dam: days with 10 mm (0.39 in) or more of precipitation in 37 years, most in 1956 with 47.
  • Tappan Dam: days with 25 mm (0.98 in) or more of precipitation in 37 years, most in 1980 with 14.
  • Tappan Dam: days with 10 cm (3.9 in) or more of snowfall in 34 years, most in 1951 with 5.
  • Tappan Dam: days with 50 mm (1.97 in) or more of precipitation in 22 years, most in 1952 with 4.
  • 6 fixed thresholds have at least one qualifying day at Tappan Dam.
37 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Tappan Dam Days per year at Tappan Dam with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 47 in 1956. 02040601950: 321951: 411952: 311953: 211954: 271955: 271956: 471957: 331958: 271959: 411960: 241961: 391962: 251963: 261964: 341965: 281966: 261967: 321968: 271969: 291970: 331971: 261972: 291973: 331974: 391975: 401976: 361977: 361978: 381979: 471980: 391981: 381982: 291983: 411984: 351985: 291986: 351950195419581962196619701974197819821986
Days per year at Tappan Dam with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 47 in 1956.
Days with 10 mm (0.39 in) or more of precipitation per year at Tappan Dam
YearDaysDecade average
19503232.7
19514132.7
19523132.7
19532132.7
19542732.7
19552732.7
19564732.7
19573332.7
19582732.7
19594132.7
19602429
19613929
19622529
19632629
19643429
19652829
19662629
19673229
19682729
19692929
19703335.7
19712635.7
19722935.7
19733335.7
19743935.7
19754035.7
19763635.7
19773635.7
19783835.7
19794735.7
19803935.1
19813835.1
19822935.1
19834135.1
19843535.1
19852935.1
19863535.1
First to last qualifying date each year at Tappan Dam For each year, a bar from the first to the last day at Tappan Dam meeting 10 mm (0.39 in). 1950: 3 January 1950 to 8 December 19501951: 3 January 1951 to 26 December 19511952: 3 January 1952 to 5 December 19521953: 9 January 1953 to 23 November 19531954: 21 January 1954 to 30 December 19541955: 6 January 1955 to 17 November 19551956: 29 January 1956 to 9 December 19561957: 23 January 1957 to 26 December 19571958: 14 January 1958 to 29 November 19581959: 2 January 1959 to 12 December 19591960: 3 January 1960 to 21 December 19601961: 1 January 1961 to 24 December 19611962: 7 January 1962 to 6 December 19621963: 11 January 1963 to 9 December 19631964: 2 January 1964 to 26 December 19641965: 2 January 1965 to 27 November 19651966: 1 January 1966 to 11 December 19661967: 27 January 1967 to 12 December 19671968: 14 January 1968 to 28 December 19681969: 18 January 1969 to 31 December 19691970: 29 January 1970 to 22 December 19701971: 4 January 1971 to 31 December 19711972: 5 January 1972 to 16 December 19721973: 4 January 1973 to 21 December 19731974: 10 January 1974 to 24 December 19741975: 1 January 1975 to 26 December 19751976: 3 January 1976 to 7 December 19761977: 13 March 1977 to 9 December 19771978: 8 January 1978 to 21 December 19781979: 1 January 1979 to 25 December 19791980: 12 January 1980 to 28 November 19801981: 2 February 1981 to 23 December 19811982: 23 January 1982 to 20 December 19821983: 2 February 1983 to 29 December 19831984: 24 January 1984 to 30 December 19841985: 12 March 1985 to 12 December 19851986: 20 January 1986 to 25 December 198619501955196019651970197519801985JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Tappan Dam meeting 10 mm (0.39 in).
First to last qualifying date each year at Tappan Dam
YearFirst dateLast date
19501950-01-031950-12-08
19511951-01-031951-12-26
19521952-01-031952-12-05
19531953-01-091953-11-23
19541954-01-211954-12-30
19551955-01-061955-11-17
19561956-01-291956-12-09
19571957-01-231957-12-26
19581958-01-141958-11-29
19591959-01-021959-12-12
19601960-01-031960-12-21
19611961-01-011961-12-24
19621962-01-071962-12-06
19631963-01-111963-12-09
19641964-01-021964-12-26
19651965-01-021965-11-27
19661966-01-011966-12-11
19671967-01-271967-12-12
19681968-01-141968-12-28
19691969-01-181969-12-31
19701970-01-291970-12-22
19711971-01-041971-12-31
19721972-01-051972-12-16
19731973-01-041973-12-21
19741974-01-101974-12-24
19751975-01-011975-12-26
19761976-01-031976-12-07
19771977-03-131977-12-09
19781978-01-081978-12-21
19791979-01-011979-12-25
19801980-01-121980-11-28
19811981-02-021981-12-23
19821982-01-231982-12-20
19831983-02-021983-12-29
19841984-01-241984-12-30
19851985-03-121985-12-12
19861986-01-201986-12-25

Every Fixed Threshold

Fixed thresholds at Tappan Dam
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3747195635
25 mm (0.98 in): Days with 25 mm or more rain3714198010
50 mm (1.97 in): Days with 50 mm or more rain22419522
100 mm (3.94 in): Days with 100 mm or more rain2119801
10 cm (3.9 in): Days with 10 cm or more snowfall34519512
25 cm (9.8 in): Days with 25 cm or more snowfall3119501

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1950.

Download the Data

  • Data for Tappan 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).