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

Santa Rosa Threshold Days by Year (BR028806240)

5 fixed thresholds counted per year at Santa Rosa (BR028806240): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Santa Rosa Thresholds

  • Santa Rosa: days with 10 mm (0.39 in) or more of precipitation in 22 years, most in 1940 with 57.
  • Santa Rosa: days with 25 mm (0.98 in) or more of precipitation in 21 years, most in 1974 with 21.
  • Santa Rosa: days with 50 mm (1.97 in) or more of precipitation in 17 years, most in 1974 with 9.
  • Santa Rosa: days with 100 mm (3.94 in) or more of precipitation in 2 years, most in 1974 with 2.
  • 5 fixed thresholds have at least one qualifying day at Santa Rosa.
22 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Santa Rosa Days per year at Santa Rosa with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 57 in 1940. 02040601934: 51935: 321936: 11937: 291938: 111939: 371940: 571941: 191942: 311962: 221963: 341964: 351965: 231966: 71968: 241969: 171970: 111971: 201972: 71973: 231974: 411975: 2619341937194019621965196919721975
Days per year at Santa Rosa with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 57 in 1940.
Days with 10 mm (0.39 in) or more of precipitation per year at Santa Rosa
YearDaysDecade average
1934519.2
19353219.2
1936119.2
19372919.2
19381119.2
19393719.2
19405735.7
19411935.7
19423135.7
19622223.1
19633423.1
19643523.1
19652323.1
1966723.1
19682423.1
19691723.1
19701121.3
19712021.3
1972721.3
19732321.3
19744121.3
19752621.3
First to last qualifying date each year at Santa Rosa For each year, a bar from the first to the last day at Santa Rosa meeting 10 mm (0.39 in). 1934: 16 January 1934 to 20 December 19341935: 7 January 1935 to 13 June 19351936: 10 April 1936 to 10 April 19361937: 26 January 1937 to 30 June 19371938: 28 January 1938 to 30 April 19381939: 30 January 1939 to 17 May 19391940: 6 January 1940 to 22 June 19401941: 9 January 1941 to 7 October 19411942: 3 January 1942 to 5 December 19421962: 26 January 1962 to 16 December 19621963: 14 January 1963 to 30 December 19631964: 5 January 1964 to 7 July 19641965: 9 February 1965 to 18 June 19651966: 10 March 1966 to 15 May 19661968: 19 January 1968 to 28 December 19681969: 23 January 1969 to 20 July 19691970: 19 January 1970 to 8 November 19701971: 21 January 1971 to 6 August 19711972: 18 February 1972 to 12 June 19721973: 2 January 1973 to 13 December 19731974: 11 January 1974 to 13 June 19741975: 8 February 1975 to 20 December 197519341937194019621965196919721975JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Santa Rosa meeting 10 mm (0.39 in).
First to last qualifying date each year at Santa Rosa
YearFirst dateLast date
19341934-01-161934-12-20
19351935-01-071935-06-13
19361936-04-101936-04-10
19371937-01-261937-06-30
19381938-01-281938-04-30
19391939-01-301939-05-17
19401940-01-061940-06-22
19411941-01-091941-10-07
19421942-01-031942-12-05
19621962-01-261962-12-16
19631963-01-141963-12-30
19641964-01-051964-07-07
19651965-02-091965-06-18
19661966-03-101966-05-15
19681968-01-191968-12-28
19691969-01-231969-07-20
19701970-01-191970-11-08
19711971-01-211971-08-06
19721972-02-181972-06-12
19731973-01-021973-12-13
19741974-01-111974-06-13
19751975-02-081975-12-20

Every Fixed Threshold

Fixed thresholds at Santa Rosa
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain2257194026
25 mm (0.98 in): Days with 25 mm or more rain212119747
50 mm (1.97 in): Days with 50 mm or more rain17919741
100 mm (3.94 in): Days with 100 mm or more rain2219742
200 mm (7.87 in): Days with 200 mm or more rain1119651

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1934.

Download the Data

  • Data for Santa Rosa 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).