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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

Langley Park Threshold Days by Year (ASN00009674)

4 fixed thresholds counted per year at Langley Park (ASN00009674): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Langley Park Thresholds

  • Langley Park: days with 10 mm (0.39 in) or more of precipitation in 33 years, most in 1968 with 35.
  • Langley Park: days with 25 mm (0.98 in) or more of precipitation in 30 years, most in 1968 with 8.
  • Langley Park: days with 50 mm (1.97 in) or more of precipitation in 8 years, most in 1961 with 1.
  • Langley Park: days with 100 mm (3.94 in) or more of precipitation in 1 years, most in 1969 with 1.
  • 4 fixed thresholds have at least one qualifying day at Langley Park.
33 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Langley Park Days per year at Langley Park with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 35 in 1968. 0102030401960: 221961: 211962: 151963: 211964: 211965: 191966: 161967: 181968: 351969: 161970: 201971: 261972: 231973: 231974: 211975: 251976: 191977: 131978: 161979: 241980: 201981: 201982: 131983: 101984: 241985: 191986: 231987: 201988: 191989: 241990: 191991: 101992: 30196019641968197219761980198419881992
Days per year at Langley Park with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 35 in 1968.
Days with 10 mm (0.39 in) or more of precipitation per year at Langley Park
YearDaysDecade average
19602220.4
19612120.4
19621520.4
19632120.4
19642120.4
19651920.4
19661620.4
19671820.4
19683520.4
19691620.4
19702021
19712621
19722321
19732321
19742121
19752521
19761921
19771321
19781621
19792421
19802019.2
19812019.2
19821319.2
19831019.2
19842419.2
19851919.2
19862319.2
19872019.2
19881919.2
19892419.2
19901919.7
19911019.7
19923019.7
First to last qualifying date each year at Langley Park For each year, a bar from the first to the last day at Langley Park meeting 10 mm (0.39 in). 1960: 8 January 1960 to 10 December 19601961: 27 January 1961 to 16 December 19611962: 10 February 1962 to 22 September 19621963: 1 January 1963 to 17 October 19631964: 30 January 1964 to 21 November 19641965: 15 March 1965 to 5 November 19651966: 2 January 1966 to 11 December 19661967: 16 March 1967 to 4 October 19671968: 28 January 1968 to 13 December 19681969: 20 March 1969 to 4 November 19691970: 17 February 1970 to 4 November 19701971: 23 March 1971 to 24 November 19711972: 6 January 1972 to 9 October 19721973: 5 February 1973 to 1 December 19731974: 3 March 1974 to 18 November 19741975: 1 April 1975 to 11 December 19751976: 7 January 1976 to 14 November 19761977: 16 May 1977 to 1 December 19771978: 15 February 1978 to 2 December 19781979: 14 February 1979 to 14 November 19791980: 25 February 1980 to 31 December 19801981: 13 January 1981 to 7 November 19811982: 5 January 1982 to 29 December 19821983: 27 February 1983 to 24 December 19831984: 1 January 1984 to 28 December 19841985: 10 March 1985 to 6 December 19851986: 22 February 1986 to 30 November 19861987: 22 January 1987 to 2 November 19871988: 14 January 1988 to 30 December 19881989: 4 April 1989 to 13 October 19891990: 13 February 1990 to 30 October 19901991: 24 May 1991 to 14 December 19911992: 15 January 1992 to 21 November 19921960196519701975198019851990JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Langley Park meeting 10 mm (0.39 in).
First to last qualifying date each year at Langley Park
YearFirst dateLast date
19601960-01-081960-12-10
19611961-01-271961-12-16
19621962-02-101962-09-22
19631963-01-011963-10-17
19641964-01-301964-11-21
19651965-03-151965-11-05
19661966-01-021966-12-11
19671967-03-161967-10-04
19681968-01-281968-12-13
19691969-03-201969-11-04
19701970-02-171970-11-04
19711971-03-231971-11-24
19721972-01-061972-10-09
19731973-02-051973-12-01
19741974-03-031974-11-18
19751975-04-011975-12-11
19761976-01-071976-11-14
19771977-05-161977-12-01
19781978-02-151978-12-02
19791979-02-141979-11-14
19801980-02-251980-12-31
19811981-01-131981-11-07
19821982-01-051982-12-29
19831983-02-271983-12-24
19841984-01-011984-12-28
19851985-03-101985-12-06
19861986-02-221986-11-30
19871987-01-221987-11-02
19881988-01-141988-12-30
19891989-04-041989-10-13
19901990-02-131990-10-30
19911991-05-241991-12-14
19921992-01-151992-11-21

Every Fixed Threshold

Fixed thresholds at Langley Park
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3335196830
25 mm (0.98 in): Days with 25 mm or more rain30819684
50 mm (1.97 in): Days with 50 mm or more rain8119611
100 mm (3.94 in): Days with 100 mm or more rain1119691

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1960.

Download the Data

  • Data for Langley Park 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).