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Built 2026-10-19 (19 October 2026)

Lake Delaware Threshold Days by Year (USC00304525)

7 fixed thresholds counted per year at Lake Delaware (USC00304525): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Lake Delaware Thresholds

  • Lake Delaware: days with 10 mm (0.39 in) or more of precipitation in 31 years, most in 1972 with 51.
  • Lake Delaware: days with 25 mm (0.98 in) or more of precipitation in 31 years, most in 1977 with 17.
  • Lake Delaware: days with 10 cm (3.9 in) or more of snowfall in 21 years, most in 1980 with 8.
  • Lake Delaware: days with 50 mm (1.97 in) or more of precipitation in 20 years, most in 1973 with 4.
  • 7 fixed thresholds have at least one qualifying day at Lake Delaware.
31 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Lake Delaware Days per year at Lake Delaware with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 51 in 1972. 02040601949: 351950: 331951: 481952: 351953: 381954: 371955: 381956: 351958: 391959: 301960: 291961: 281962: 321963: 261964: 241965: 231966: 301967: 311968: 391969: 291970: 301971: 331972: 511973: 411974: 411975: 431976: 391977: 401978: 331979: 441980: 2719491953195819621966197019741978
Days per year at Lake Delaware with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 51 in 1972.
Days with 10 mm (0.39 in) or more of precipitation per year at Lake Delaware
YearDaysDecade average
19493535
19503337
19514837
19523537
19533837
19543737
19553837
19563537
19583937
19593037
19602929.1
19612829.1
19623229.1
19632629.1
19642429.1
19652329.1
19663029.1
19673129.1
19683929.1
19692929.1
19703039.5
19713339.5
19725139.5
19734139.5
19744139.5
19754339.5
19763939.5
19774039.5
19783339.5
19794439.5
19802727
First to last qualifying date each year at Lake Delaware For each year, a bar from the first to the last day at Lake Delaware meeting 10 mm (0.39 in). 1949: 1 January 1949 to 13 December 19491950: 6 January 1950 to 5 December 19501951: 8 January 1951 to 31 December 19511952: 18 January 1952 to 22 December 19521953: 9 January 1953 to 14 December 19531954: 27 January 1954 to 30 December 19541955: 7 February 1955 to 14 November 19551956: 5 February 1956 to 29 December 19561958: 15 January 1958 to 6 December 19581959: 22 January 1959 to 29 December 19591960: 3 January 1960 to 30 November 19601961: 2 January 1961 to 25 November 19611962: 7 January 1962 to 6 December 19621963: 13 January 1963 to 9 December 19631964: 14 January 1964 to 12 December 19641965: 24 January 1965 to 17 November 19651966: 3 January 1966 to 25 December 19661967: 28 January 1967 to 29 December 19671968: 13 March 1968 to 29 December 19681969: 25 March 1969 to 27 December 19691970: 3 February 1970 to 12 December 19701971: 14 January 1971 to 31 December 19711972: 3 January 1972 to 22 December 19721973: 1 January 1973 to 27 December 19731974: 11 January 1974 to 17 December 19741975: 9 January 1975 to 27 December 19751976: 12 January 1976 to 8 December 19761977: 21 February 1977 to 22 December 19771978: 9 January 1978 to 25 December 19781979: 2 January 1979 to 25 December 19791980: 12 January 1980 to 25 November 198019491953195819621966197019741978JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Lake Delaware meeting 10 mm (0.39 in).
First to last qualifying date each year at Lake Delaware
YearFirst dateLast date
19491949-01-011949-12-13
19501950-01-061950-12-05
19511951-01-081951-12-31
19521952-01-181952-12-22
19531953-01-091953-12-14
19541954-01-271954-12-30
19551955-02-071955-11-14
19561956-02-051956-12-29
19581958-01-151958-12-06
19591959-01-221959-12-29
19601960-01-031960-11-30
19611961-01-021961-11-25
19621962-01-071962-12-06
19631963-01-131963-12-09
19641964-01-141964-12-12
19651965-01-241965-11-17
19661966-01-031966-12-25
19671967-01-281967-12-29
19681968-03-131968-12-29
19691969-03-251969-12-27
19701970-02-031970-12-12
19711971-01-141971-12-31
19721972-01-031972-12-22
19731973-01-011973-12-27
19741974-01-111974-12-17
19751975-01-091975-12-27
19761976-01-121976-12-08
19771977-02-211977-12-22
19781978-01-091978-12-25
19791979-01-021979-12-25
19801980-01-121980-11-25

Every Fixed Threshold

Fixed thresholds at Lake Delaware
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3151197227
25 mm (0.98 in): Days with 25 mm or more rain311719775
50 mm (1.97 in): Days with 50 mm or more rain20419731
100 mm (3.94 in): Days with 100 mm or more rain2119521
10 cm (3.9 in): Days with 10 cm or more snowfall21819808
25 cm (9.8 in): Days with 25 cm or more snowfall9319711
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 Lake Delaware 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).