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Built 2026-10-19 (19 October 2026)

Portsmouth US Grant Br Threshold Days by Year (USC00336786)

7 fixed thresholds counted per year at Portsmouth US Grant Br (USC00336786): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Portsmouth US Grant Br Thresholds

  • Portsmouth US Grant Br: days with 10 mm (0.39 in) or more of precipitation in 33 years, most in 1950 with 51.
  • Portsmouth US Grant Br: days with 25 mm (0.98 in) or more of precipitation in 33 years, most in 1950 with 15.
  • Portsmouth US Grant Br: days with 50 mm (1.97 in) or more of precipitation in 26 years, most in 1955 with 4.
  • Portsmouth US Grant Br: days with 10 cm (3.9 in) or more of snowfall in 6 years, most in 1960 with 4.
  • 7 fixed thresholds have at least one qualifying day at Portsmouth US Grant Br.
33 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Portsmouth US Grant Br Days per year at Portsmouth US Grant Br with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 51 in 1950. 02040601949: 351950: 511951: 411952: 361953: 261954: 301955: 371957: 321958: 341959: 431960: 271961: 401962: 361963: 291964: 271965: 371966: 341967: 301968: 331969: 271970: 321971: 341972: 431973: 421974: 341975: 451976: 311977: 331979: 351980: 291981: 221982: 261987: 12194919531958196219661970197419791987
Days per year at Portsmouth US Grant Br with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 51 in 1950.
Days with 10 mm (0.39 in) or more of precipitation per year at Portsmouth US Grant Br
YearDaysDecade average
19493535
19505136.7
19514136.7
19523636.7
19532636.7
19543036.7
19553736.7
19573236.7
19583436.7
19594336.7
19602732
19614032
19623632
19632932
19642732
19653732
19663432
19673032
19683332
19692732
19703236.6
19713436.6
19724336.6
19734236.6
19743436.6
19754536.6
19763136.6
19773336.6
19793536.6
19802922.3
19812222.3
19822622.3
19871222.3
First to last qualifying date each year at Portsmouth US Grant Br For each year, a bar from the first to the last day at Portsmouth US Grant Br meeting 10 mm (0.39 in). 1949: 5 January 1949 to 18 December 19491950: 3 January 1950 to 8 December 19501951: 3 January 1951 to 21 December 19511952: 2 January 1952 to 10 December 19521953: 8 January 1953 to 14 December 19531954: 15 January 1954 to 30 December 19541955: 5 January 1955 to 2 December 19551957: 10 January 1957 to 26 December 19571958: 14 January 1958 to 5 December 19581959: 2 January 1959 to 18 December 19591960: 13 January 1960 to 21 December 19601961: 1 January 1961 to 17 December 19611962: 6 January 1962 to 29 December 19621963: 11 January 1963 to 29 November 19631964: 1 January 1964 to 12 December 19641965: 9 January 1965 to 27 November 19651966: 1 January 1966 to 28 December 19661967: 14 January 1967 to 22 December 19671968: 1 January 1968 to 28 December 19681969: 18 January 1969 to 31 December 19691970: 2 February 1970 to 22 December 19701971: 4 January 1971 to 7 December 19711972: 2 January 1972 to 20 December 19721973: 4 January 1973 to 21 December 19731974: 4 January 1974 to 9 December 19741975: 1 January 1975 to 26 December 19751976: 1 January 1976 to 7 December 19761977: 5 January 1977 to 9 December 19771979: 6 January 1979 to 24 December 19791980: 25 January 1980 to 9 December 19801981: 2 February 1981 to 23 December 19811982: 4 January 1982 to 27 December 19821987: 2 January 1987 to 10 November 19871949195419601965197019751981JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Portsmouth US Grant Br meeting 10 mm (0.39 in).
First to last qualifying date each year at Portsmouth US Grant Br
YearFirst dateLast date
19491949-01-051949-12-18
19501950-01-031950-12-08
19511951-01-031951-12-21
19521952-01-021952-12-10
19531953-01-081953-12-14
19541954-01-151954-12-30
19551955-01-051955-12-02
19571957-01-101957-12-26
19581958-01-141958-12-05
19591959-01-021959-12-18
19601960-01-131960-12-21
19611961-01-011961-12-17
19621962-01-061962-12-29
19631963-01-111963-11-29
19641964-01-011964-12-12
19651965-01-091965-11-27
19661966-01-011966-12-28
19671967-01-141967-12-22
19681968-01-011968-12-28
19691969-01-181969-12-31
19701970-02-021970-12-22
19711971-01-041971-12-07
19721972-01-021972-12-20
19731973-01-041973-12-21
19741974-01-041974-12-09
19751975-01-011975-12-26
19761976-01-011976-12-07
19771977-01-051977-12-09
19791979-01-061979-12-24
19801980-01-251980-12-09
19811981-02-021981-12-23
19821982-01-041982-12-27
19871987-01-021987-11-10

Every Fixed Threshold

Fixed thresholds at Portsmouth US Grant Br
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3351195012
25 mm (0.98 in): Days with 25 mm or more rain331519503
50 mm (1.97 in): Days with 50 mm or more rain26419552
100 mm (3.94 in): Days with 100 mm or more rain1119501
10 cm (3.9 in): Days with 10 cm or more snowfall6419604
25 cm (9.8 in): Days with 25 cm or more snowfall2119501
50 cm (19.7 in): Days with 50 cm or more snowfall1119501

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 Portsmouth US Grant Br 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).