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Built 2026-10-19 (19 October 2026)

Langley Threshold Days by Year (ASN00088094)

4 fixed thresholds counted per year at Langley (ASN00088094): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Langley Thresholds

  • Langley: days with 10 mm (0.39 in) or more of precipitation in 30 years, most in 1916 with 32.
  • Langley: days with 25 mm (0.98 in) or more of precipitation in 29 years, most in 1917 with 11.
  • Langley: days with 50 mm (1.97 in) or more of precipitation in 15 years, most in 1930 with 4.
  • Langley: days with 100 mm (3.94 in) or more of precipitation in 1 years, most in 1916 with 1.
  • 4 fixed thresholds have at least one qualifying day at Langley.
30 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Langley Days per year at Langley with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 32 in 1916. 0102030401906: 211907: 161908: 141909: 291910: 251911: 251912: 241913: 181914: 101915: 251916: 321917: 311918: 241920: 231921: 251922: 111923: 231924: 281925: 201926: 211927: 141928: 211929: 131930: 231931: 261932: 221933: 211934: 211935: 211936: 221906190919121915191819221925192819311934
Days per year at Langley with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 32 in 1916.
Days with 10 mm (0.39 in) or more of precipitation per year at Langley
YearDaysDecade average
19062120
19071620
19081420
19092920
19102523.8
19112523.8
19122423.8
19131823.8
19141023.8
19152523.8
19163223.8
19173123.8
19182423.8
19202319.9
19212519.9
19221119.9
19232319.9
19242819.9
19252019.9
19262119.9
19271419.9
19282119.9
19291319.9
19302322.3
19312622.3
19322222.3
19332122.3
19342122.3
19352122.3
19362222.3
First to last qualifying date each year at Langley For each year, a bar from the first to the last day at Langley meeting 10 mm (0.39 in). 1906: 28 February 1906 to 18 December 19061907: 26 January 1907 to 28 December 19071908: 9 March 1908 to 16 October 19081909: 4 January 1909 to 1 December 19091910: 6 March 1910 to 10 December 19101911: 18 January 1911 to 13 December 19111912: 8 February 1912 to 8 December 19121913: 10 March 1913 to 31 December 19131914: 14 March 1914 to 22 December 19141915: 20 February 1915 to 23 October 19151916: 28 January 1916 to 12 December 19161917: 21 January 1917 to 31 December 19171918: 15 January 1918 to 30 October 19181920: 20 January 1920 to 17 December 19201921: 2 January 1921 to 15 November 19211922: 13 January 1922 to 29 October 19221923: 19 March 1923 to 16 December 19231924: 3 January 1924 to 26 December 19241925: 13 January 1925 to 19 November 19251926: 8 January 1926 to 22 December 19261927: 17 January 1927 to 10 December 19271928: 18 January 1928 to 15 October 19281929: 22 February 1929 to 28 December 19291930: 21 February 1930 to 25 December 19301931: 2 March 1931 to 17 November 19311932: 10 February 1932 to 16 December 19321933: 29 March 1933 to 26 December 19331934: 7 January 1934 to 30 November 19341935: 5 January 1935 to 2 December 19351936: 2 February 1936 to 29 December 193619061910191419181923192719311935JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Langley meeting 10 mm (0.39 in).
First to last qualifying date each year at Langley
YearFirst dateLast date
19061906-02-281906-12-18
19071907-01-261907-12-28
19081908-03-091908-10-16
19091909-01-041909-12-01
19101910-03-061910-12-10
19111911-01-181911-12-13
19121912-02-081912-12-08
19131913-03-101913-12-31
19141914-03-141914-12-22
19151915-02-201915-10-23
19161916-01-281916-12-12
19171917-01-211917-12-31
19181918-01-151918-10-30
19201920-01-201920-12-17
19211921-01-021921-11-15
19221922-01-131922-10-29
19231923-03-191923-12-16
19241924-01-031924-12-26
19251925-01-131925-11-19
19261926-01-081926-12-22
19271927-01-171927-12-10
19281928-01-181928-10-15
19291929-02-221929-12-28
19301930-02-211930-12-25
19311931-03-021931-11-17
19321932-02-101932-12-16
19331933-03-291933-12-26
19341934-01-071934-11-30
19351935-01-051935-12-02
19361936-02-021936-12-29

Every Fixed Threshold

Fixed thresholds at Langley
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3032191622
25 mm (0.98 in): Days with 25 mm or more rain291119175
50 mm (1.97 in): Days with 50 mm or more rain15419301
100 mm (3.94 in): Days with 100 mm or more rain1119161

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1906.

Download the Data

  • Data for Langley 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).