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Data as of 2025-12-31
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Built 2026-10-18 (18 October 2026)

Siwan Threshold Days by Year

5 fixed thresholds counted per year at Siwan (IN004140200): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Siwan Thresholds

  • Siwan: days with 10 mm (0.39 in) or more of precipitation in 60 years, most in 1922 with 46.
  • Siwan: days with 25 mm (0.98 in) or more of precipitation in 60 years, most in 1916 with 31.
  • Siwan: days with 50 mm (1.97 in) or more of precipitation in 60 years, most in 1915 with 17.
  • Siwan: days with 100 mm (3.94 in) or more of precipitation in 36 years, most in 1915 with 5.
  • 5 fixed thresholds have at least one qualifying day at Siwan.
60 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Siwan Days per year at Siwan with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 46 in 1922. 02040601901: 251902: 251903: 231904: 301905: 291906: 321907: 221908: 191909: 351910: 371911: 331912: 311913: 381914: 311915: 401916: 411917: 361918: 291919: 251920: 231921: 411922: 461923: 291924: 331925: 271926: 241927: 281928: 261929: 351930: 251931: 231932: 151933: 291934: 321935: 261936: 351937: 361938: 411939: 321940: 241941: 251942: 301943: 241944: 301946: 321949: 261950: 281951: 231952: 271954: 281955: 341956: 381957: 261958: 221959: 241960: 301964: 331965: 291966: 281968: 281901190719131919192519311937194319521959
Days per year at Siwan with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 46 in 1922.
Days with 10 mm (0.39 in) or more of precipitation per year at Siwan
YearDaysDecade average
19012526.7
19022526.7
19032326.7
19043026.7
19052926.7
19063226.7
19072226.7
19081926.7
19093526.7
19103734.1
19113334.1
19123134.1
19133834.1
19143134.1
19154034.1
19164134.1
19173634.1
19182934.1
19192534.1
19202331.2
19214131.2
19224631.2
19232931.2
19243331.2
19252731.2
19262431.2
19272831.2
19282631.2
19293531.2
19302529.4
19312329.4
19321529.4
19332929.4
19343229.4
19352629.4
19363529.4
19373629.4
19384129.4
19393229.4
19402427.3
19412527.3
19423027.3
19432427.3
19443027.3
19463227.3
19492627.3
19502827.8
19512327.8
19522727.8
19542827.8
19553427.8
19563827.8
19572627.8
19582227.8
19592427.8
19603029.6
19643329.6
19652929.6
19662829.6
19682829.6
First to last qualifying date each year at Siwan For each year, a bar from the first to the last day at Siwan meeting 10 mm (0.39 in). 1901: 1 January 1901 to 25 September 19011902: 11 May 1902 to 27 September 19021903: 28 May 1903 to 9 October 19031904: 7 May 1904 to 18 December 19041905: 17 February 1905 to 1 October 19051906: 22 February 1906 to 1 October 19061907: 6 February 1907 to 4 September 19071908: 18 June 1908 to 1 October 19081909: 28 April 1909 to 27 December 19091910: 28 May 1910 to 7 October 19101911: 27 January 1911 to 20 November 19111912: 11 January 1912 to 24 November 19121913: 16 February 1913 to 13 December 19131914: 18 February 1914 to 25 September 19141915: 21 February 1915 to 18 October 19151916: 18 February 1916 to 22 October 19161917: 5 May 1917 to 2 October 19171918: 4 May 1918 to 13 September 19181919: 30 January 1919 to 10 October 19191920: 3 February 1920 to 17 October 19201921: 22 January 1921 to 13 October 19211922: 1 June 1922 to 23 December 19221923: 16 February 1923 to 4 October 19231924: 29 June 1924 to 8 November 19241925: 24 April 1925 to 24 September 19251926: 9 January 1926 to 28 September 19261927: 13 January 1927 to 16 November 19271928: 4 February 1928 to 6 October 19281929: 10 May 1929 to 21 December 19291930: 2 February 1930 to 30 December 19301931: 8 February 1931 to 17 October 19311932: 24 June 1932 to 4 November 19321933: 14 April 1933 to 21 October 19331934: 13 January 1934 to 17 October 19341935: 3 January 1935 to 21 September 19351936: 23 January 1936 to 24 October 19361937: 12 February 1937 to 7 October 19371938: 26 January 1938 to 14 October 19381939: 23 February 1939 to 8 October 19391940: 10 February 1940 to 21 December 19401941: 13 May 1941 to 19 September 19411942: 17 January 1942 to 29 September 19421943: 23 April 1943 to 27 September 19431944: 14 January 1944 to 6 October 19441946: 19 February 1946 to 29 October 19461949: 28 January 1949 to 31 October 19491950: 27 January 1950 to 6 September 19501951: 21 January 1951 to 8 October 19511952: 20 February 1952 to 24 September 19521954: 20 February 1954 to 29 September 19541955: 4 February 1955 to 26 September 19551956: 29 January 1956 to 29 December 19561957: 9 January 1957 to 31 August 19571958: 28 January 1958 to 10 October 19581959: 28 January 1959 to 26 October 19591960: 6 March 1960 to 2 October 19601964: 16 April 1964 to 21 October 19641965: 19 March 1965 to 21 October 19651966: 3 January 1966 to 15 November 19661968: 6 January 1968 to 4 October 196819011909191719251933194119521964JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Siwan meeting 10 mm (0.39 in).
First to last qualifying date each year at Siwan
YearFirst dateLast date
19011901-01-011901-09-25
19021902-05-111902-09-27
19031903-05-281903-10-09
19041904-05-071904-12-18
19051905-02-171905-10-01
19061906-02-221906-10-01
19071907-02-061907-09-04
19081908-06-181908-10-01
19091909-04-281909-12-27
19101910-05-281910-10-07
19111911-01-271911-11-20
19121912-01-111912-11-24
19131913-02-161913-12-13
19141914-02-181914-09-25
19151915-02-211915-10-18
19161916-02-181916-10-22
19171917-05-051917-10-02
19181918-05-041918-09-13
19191919-01-301919-10-10
19201920-02-031920-10-17
19211921-01-221921-10-13
19221922-06-011922-12-23
19231923-02-161923-10-04
19241924-06-291924-11-08
19251925-04-241925-09-24
19261926-01-091926-09-28
19271927-01-131927-11-16
19281928-02-041928-10-06
19291929-05-101929-12-21
19301930-02-021930-12-30
19311931-02-081931-10-17
19321932-06-241932-11-04
19331933-04-141933-10-21
19341934-01-131934-10-17
19351935-01-031935-09-21
19361936-01-231936-10-24
19371937-02-121937-10-07
19381938-01-261938-10-14
19391939-02-231939-10-08
19401940-02-101940-12-21
19411941-05-131941-09-19
19421942-01-171942-09-29
19431943-04-231943-09-27
19441944-01-141944-10-06
19461946-02-191946-10-29
19491949-01-281949-10-31
19501950-01-271950-09-06
19511951-01-211951-10-08
19521952-02-201952-09-24
19541954-02-201954-09-29
19551955-02-041955-09-26
19561956-01-291956-12-29
19571957-01-091957-08-31
19581958-01-281958-10-10
19591959-01-281959-10-26
19601960-03-061960-10-02
19641964-04-161964-10-21
19651965-03-191965-10-21
19661966-01-031966-11-15
19681968-01-061968-10-04

Every Fixed Threshold

Fixed thresholds at Siwan
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain6046192228
25 mm (0.98 in): Days with 25 mm or more rain6031191610
50 mm (1.97 in): Days with 50 mm or more rain601719152
100 mm (3.94 in): Days with 100 mm or more rain36519151
200 mm (7.87 in): Days with 200 mm or more rain3119341

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1901.

Download the Data

  • Data for Siwan 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).