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Built 2026-10-17 (17 October 2026)

Waikapu 390 Threshold Days by Year

5 fixed thresholds counted per year at Waikapu 390 (USC00519376): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Waikapu 390 Thresholds

  • Waikapu 390: days with 10 mm (0.39 in) or more of precipitation in 42 years, most in 1918 with 38.
  • Waikapu 390: days with 25 mm (0.98 in) or more of precipitation in 42 years, most in 1950 with 17.
  • Waikapu 390: days with 50 mm (1.97 in) or more of precipitation in 32 years, most in 1961 with 7.
  • Waikapu 390: days with 100 mm (3.94 in) or more of precipitation in 15 years, most in 1918 with 2.
  • 5 fixed thresholds have at least one qualifying day at Waikapu 390.
42 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Waikapu 390 Days per year at Waikapu 390 with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 38 in 1918. 0102030401917: 181918: 381919: 131920: 141921: 191922: 121923: 311926: 101928: 101929: 291930: 231931: 161933: 131934: 131935: 111936: 211950: 341951: 121952: 71953: 91954: 181955: 131956: 201958: 161960: 141961: 231962: 161963: 181964: 131965: 231966: 111967: 261974: 201975: 91976: 101977: 91978: 162012: 72013: 162014: 242016: 212017: 16191719221930193619541961196619772016
Days per year at Waikapu 390 with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 38 in 1918.
Days with 10 mm (0.39 in) or more of precipitation per year at Waikapu 390
YearDaysDecade average
19171823
19183823
19191323
19201417.9
19211917.9
19221217.9
19233117.9
19261017.9
19281017.9
19292917.9
19302316.2
19311616.2
19331316.2
19341316.2
19351116.2
19362116.2
19503416.1
19511216.1
1952716.1
1953916.1
19541816.1
19551316.1
19562016.1
19581616.1
19601418
19612318
19621618
19631818
19641318
19652318
19661118
19672618
19742012.8
1975912.8
19761012.8
1977912.8
19781612.8
2012716.8
20131616.8
20142416.8
20162116.8
20171616.8
First to last qualifying date each year at Waikapu 390 For each year, a bar from the first to the last day at Waikapu 390 meeting 10 mm (0.39 in). 1917: 11 January 1917 to 28 December 19171918: 8 January 1918 to 31 December 19181919: 22 January 1919 to 31 December 19191920: 17 January 1920 to 25 December 19201921: 15 January 1921 to 25 December 19211922: 17 January 1922 to 25 November 19221923: 12 January 1923 to 19 December 19231926: 1 January 1926 to 19 December 19261928: 9 February 1928 to 5 December 19281929: 15 January 1929 to 29 December 19291930: 2 January 1930 to 29 December 19301931: 31 March 1931 to 15 December 19311933: 1 January 1933 to 25 December 19331934: 1 February 1934 to 12 November 19341935: 20 January 1935 to 12 November 19351936: 31 January 1936 to 24 November 19361950: 10 January 1950 to 30 December 19501951: 22 January 1951 to 14 December 19511952: 1 January 1952 to 26 October 19521953: 7 January 1953 to 28 December 19531954: 26 February 1954 to 29 December 19541955: 22 January 1955 to 22 December 19551956: 13 January 1956 to 1 December 19561958: 24 January 1958 to 30 December 19581960: 29 January 1960 to 29 December 19601961: 2 January 1961 to 3 November 19611962: 8 January 1962 to 18 December 19621963: 8 January 1963 to 11 December 19631964: 8 January 1964 to 21 December 19641965: 6 January 1965 to 2 December 19651966: 25 January 1966 to 7 December 19661967: 4 January 1967 to 29 December 19671974: 2 January 1974 to 20 November 19741975: 8 January 1975 to 25 November 19751976: 16 January 1976 to 17 November 19761977: 21 January 1977 to 7 December 19771978: 1 January 1978 to 7 December 19782012: 4 January 2012 to 20 September 20122013: 30 January 2013 to 29 December 20132014: 3 January 2014 to 31 December 20142016: 21 January 2016 to 31 December 20162017: 1 January 2017 to 21 December 20171917192319331952196019661978JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Waikapu 390 meeting 10 mm (0.39 in).
First to last qualifying date each year at Waikapu 390
YearFirst dateLast date
19171917-01-111917-12-28
19181918-01-081918-12-31
19191919-01-221919-12-31
19201920-01-171920-12-25
19211921-01-151921-12-25
19221922-01-171922-11-25
19231923-01-121923-12-19
19261926-01-011926-12-19
19281928-02-091928-12-05
19291929-01-151929-12-29
19301930-01-021930-12-29
19311931-03-311931-12-15
19331933-01-011933-12-25
19341934-02-011934-11-12
19351935-01-201935-11-12
19361936-01-311936-11-24
19501950-01-101950-12-30
19511951-01-221951-12-14
19521952-01-011952-10-26
19531953-01-071953-12-28
19541954-02-261954-12-29
19551955-01-221955-12-22
19561956-01-131956-12-01
19581958-01-241958-12-30
19601960-01-291960-12-29
19611961-01-021961-11-03
19621962-01-081962-12-18
19631963-01-081963-12-11
19641964-01-081964-12-21
19651965-01-061965-12-02
19661966-01-251966-12-07
19671967-01-041967-12-29
19741974-01-021974-11-20
19751975-01-081975-11-25
19761976-01-161976-11-17
19771977-01-211977-12-07
19781978-01-011978-12-07
20122012-01-042012-09-20
20132013-01-302013-12-29
20142014-01-032014-12-31
20162016-01-212016-12-31
20172017-01-012017-12-21

Every Fixed Threshold

Fixed thresholds at Waikapu 390
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain4238191816
25 mm (0.98 in): Days with 25 mm or more rain421719508
50 mm (1.97 in): Days with 50 mm or more rain32719613
100 mm (3.94 in): Days with 100 mm or more rain15219181
200 mm (7.87 in): Days with 200 mm or more rain1120171

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1917.

Download the Data

  • Data for Waikapu 390 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).