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Built 2026-10-17 (17 October 2026)

Philadelphia Threshold Days by Year

4 fixed thresholds counted per year at Philadelphia (SF001200100): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Philadelphia Thresholds

  • Philadelphia: days with 10 mm (0.39 in) or more of precipitation in 64 years, most in 1988 with 23.
  • Philadelphia: days with 25 mm (0.98 in) or more of precipitation in 60 years, most in 1950 with 10.
  • Philadelphia: days with 50 mm (1.97 in) or more of precipitation in 9 years, most in 1950 with 3.
  • Philadelphia: days with 100 mm (3.94 in) or more of precipitation in 1 years, most in 1970 with 1.
  • 4 fixed thresholds have at least one qualifying day at Philadelphia.
64 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Philadelphia Days per year at Philadelphia with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 23 in 1988. 01020301924: 81927: 51929: 121933: 101934: 121935: 81936: 71938: 111939: 221940: 101941: 151942: 121944: 111945: 71946: 51947: 101948: 111949: 41950: 201951: 121952: 151953: 161955: 141956: 161957: 51958: 121959: 111960: 141961: 161962: 81963: 151964: 71965: 121966: 31967: 131968: 61969: 71970: 111971: 91972: 81973: 91974: 221975: 121976: 201977: 131978: 31979: 101980: 61981: 211982: 121983: 111984: 91985: 181986: 141987: 151988: 231989: 181990: 61991: 171992: 61993: 111994: 141995: 151996: 141924193819461953196119681975198219891996
Days per year at Philadelphia with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 23 in 1988.
Days with 10 mm (0.39 in) or more of precipitation per year at Philadelphia
YearDaysDecade average
192488.3
192758.3
1929128.3
19331011.7
19341211.7
1935811.7
1936711.7
19381111.7
19392211.7
1940109.4
1941159.4
1942129.4
1944119.4
194579.4
194659.4
1947109.4
1948119.4
194949.4
19502013.4
19511213.4
19521513.4
19531613.4
19551413.4
19561613.4
1957513.4
19581213.4
19591113.4
19601410.1
19611610.1
1962810.1
19631510.1
1964710.1
19651210.1
1966310.1
19671310.1
1968610.1
1969710.1
19701111.7
1971911.7
1972811.7
1973911.7
19742211.7
19751211.7
19762011.7
19771311.7
1978311.7
19791011.7
1980614.7
19812114.7
19821214.7
19831114.7
1984914.7
19851814.7
19861414.7
19871514.7
19882314.7
19891814.7
1990611.9
19911711.9
1992611.9
19931111.9
19941411.9
19951511.9
19961411.9
First to last qualifying date each year at Philadelphia For each year, a bar from the first to the last day at Philadelphia meeting 10 mm (0.39 in). 1924: 20 February 1924 to 24 December 19241927: 9 March 1927 to 7 November 19271929: 4 March 1929 to 18 December 19291933: 22 February 1933 to 29 December 19331934: 3 January 1934 to 17 November 19341935: 5 February 1935 to 3 November 19351936: 26 February 1936 to 27 November 19361938: 20 January 1938 to 17 December 19381939: 11 January 1939 to 26 November 19391940: 19 January 1940 to 10 November 19401941: 20 January 1941 to 29 October 19411942: 25 January 1942 to 4 December 19421944: 14 January 1944 to 20 October 19441945: 27 February 1945 to 31 December 19451946: 1 May 1946 to 18 December 19461947: 8 January 1947 to 24 December 19471948: 22 January 1948 to 10 October 19481949: 11 April 1949 to 10 December 19491950: 8 February 1950 to 29 December 19501951: 1 January 1951 to 30 September 19511952: 6 February 1952 to 15 December 19521953: 2 February 1953 to 19 December 19531955: 3 January 1955 to 17 December 19551956: 17 January 1956 to 20 December 19561957: 30 January 1957 to 9 December 19571958: 12 January 1958 to 27 December 19581959: 24 January 1959 to 3 December 19591960: 16 January 1960 to 29 December 19601961: 14 January 1961 to 26 November 19611962: 8 January 1962 to 19 November 19621963: 3 January 1963 to 8 December 19631964: 11 February 1964 to 19 October 19641965: 2 February 1965 to 16 November 19651966: 19 January 1966 to 18 December 19661967: 13 January 1967 to 26 May 19671968: 11 March 1968 to 1 December 19681969: 24 February 1969 to 18 October 19691970: 23 January 1970 to 19 December 19701971: 10 February 1971 to 12 October 19711972: 5 January 1972 to 13 October 19721973: 17 February 1973 to 3 December 19731974: 16 January 1974 to 28 November 19741975: 19 February 1975 to 22 December 19751976: 3 January 1976 to 5 November 19761977: 10 January 1977 to 31 December 19771978: 17 February 1978 to 9 December 19781979: 8 January 1979 to 18 October 19791980: 20 January 1980 to 3 November 19801981: 25 January 1981 to 6 December 19811982: 21 February 1982 to 16 November 19821983: 1 February 1983 to 29 December 19831984: 7 April 1984 to 28 November 19841985: 16 January 1985 to 19 December 19851986: 18 January 1986 to 29 November 19861987: 9 February 1987 to 29 November 19871988: 16 February 1988 to 29 December 19881989: 4 January 1989 to 13 December 19891990: 8 February 1990 to 5 December 19901991: 22 January 1991 to 31 December 19911992: 18 February 1992 to 5 November 19921993: 1 January 1993 to 29 December 19931994: 9 January 1994 to 7 March 19941995: 13 January 1995 to 26 December 19951996: 22 January 1996 to 29 December 199619241939194819571965197319811989JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Philadelphia meeting 10 mm (0.39 in).
First to last qualifying date each year at Philadelphia
YearFirst dateLast date
19241924-02-201924-12-24
19271927-03-091927-11-07
19291929-03-041929-12-18
19331933-02-221933-12-29
19341934-01-031934-11-17
19351935-02-051935-11-03
19361936-02-261936-11-27
19381938-01-201938-12-17
19391939-01-111939-11-26
19401940-01-191940-11-10
19411941-01-201941-10-29
19421942-01-251942-12-04
19441944-01-141944-10-20
19451945-02-271945-12-31
19461946-05-011946-12-18
19471947-01-081947-12-24
19481948-01-221948-10-10
19491949-04-111949-12-10
19501950-02-081950-12-29
19511951-01-011951-09-30
19521952-02-061952-12-15
19531953-02-021953-12-19
19551955-01-031955-12-17
19561956-01-171956-12-20
19571957-01-301957-12-09
19581958-01-121958-12-27
19591959-01-241959-12-03
19601960-01-161960-12-29
19611961-01-141961-11-26
19621962-01-081962-11-19
19631963-01-031963-12-08
19641964-02-111964-10-19
19651965-02-021965-11-16
19661966-01-191966-12-18
19671967-01-131967-05-26
19681968-03-111968-12-01
19691969-02-241969-10-18
19701970-01-231970-12-19
19711971-02-101971-10-12
19721972-01-051972-10-13
19731973-02-171973-12-03
19741974-01-161974-11-28
19751975-02-191975-12-22
19761976-01-031976-11-05
19771977-01-101977-12-31
19781978-02-171978-12-09
19791979-01-081979-10-18
19801980-01-201980-11-03
19811981-01-251981-12-06
19821982-02-211982-11-16
19831983-02-011983-12-29
19841984-04-071984-11-28
19851985-01-161985-12-19
19861986-01-181986-11-29
19871987-02-091987-11-29
19881988-02-161988-12-29
19891989-01-041989-12-13
19901990-02-081990-12-05
19911991-01-221991-12-31
19921992-02-181992-11-05
19931993-01-011993-12-29
19941994-01-091994-03-07
19951995-01-131995-12-26
19961996-01-221996-12-29

Every Fixed Threshold

Fixed thresholds at Philadelphia
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain6423198814
25 mm (0.98 in): Days with 25 mm or more rain601019503
50 mm (1.97 in): Days with 50 mm or more rain9319501
100 mm (3.94 in): Days with 100 mm or more rain1119701

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1924.

Download the Data

  • Data for Philadelphia 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 2026-10-15 (15 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).