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Built 2026-10-19 (19 October 2026)

Riverside Threshold Days by Year (USC00417651)

5 fixed thresholds counted per year at Riverside (USC00417651): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Riverside Thresholds

  • Riverside: days with 10 mm (0.39 in) or more of precipitation in 35 years, most in 1957 with 46.
  • Riverside: days with 25 mm (0.98 in) or more of precipitation in 35 years, most in 1911 with 24.
  • Riverside: days with 50 mm (1.97 in) or more of precipitation in 32 years, most in 1968 with 8.
  • Riverside: days with 100 mm (3.94 in) or more of precipitation in 12 years, most in 1947 with 2.
  • 5 fixed thresholds have at least one qualifying day at Riverside.
35 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Riverside Days per year at Riverside with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 46 in 1957. 02040601904: 341905: 441906: 251907: 351908: 321909: 311910: 241911: 391912: 371913: 381914: 371916: 251947: 341948: 231949: 351950: 311951: 341952: 271953: 291954: 211955: 281956: 251957: 461958: 331959: 301960: 351961: 321962: 321963: 311964: 301965: 341966: 231967: 271968: 401969: 28190419081912194719511955195919631967
Days per year at Riverside with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 46 in 1957.
Days with 10 mm (0.39 in) or more of precipitation per year at Riverside
YearDaysDecade average
19043433.5
19054433.5
19062533.5
19073533.5
19083233.5
19093133.5
19102433.3
19113933.3
19123733.3
19133833.3
19143733.3
19162533.3
19473430.7
19482330.7
19493530.7
19503130.4
19513430.4
19522730.4
19532930.4
19542130.4
19552830.4
19562530.4
19574630.4
19583330.4
19593030.4
19603531.2
19613231.2
19623231.2
19633131.2
19643031.2
19653431.2
19662331.2
19672731.2
19684031.2
19692831.2
First to last qualifying date each year at Riverside For each year, a bar from the first to the last day at Riverside meeting 10 mm (0.39 in). 1904: 25 January 1904 to 26 December 19041905: 12 January 1905 to 30 December 19051906: 2 January 1906 to 30 December 19061907: 2 January 1907 to 22 December 19071908: 6 January 1908 to 30 November 19081909: 5 February 1909 to 25 December 19091910: 6 January 1910 to 23 December 19101911: 9 February 1911 to 30 December 19111912: 11 January 1912 to 30 December 19121913: 11 January 1913 to 28 December 19131914: 13 February 1914 to 29 December 19141916: 2 January 1916 to 26 December 19161947: 1 January 1947 to 15 December 19471948: 1 January 1948 to 29 December 19481949: 16 January 1949 to 27 December 19491950: 1 January 1950 to 3 November 19501951: 2 January 1951 to 25 December 19511952: 27 January 1952 to 31 December 19521953: 23 January 1953 to 28 December 19531954: 10 January 1954 to 28 December 19541955: 15 January 1955 to 2 December 19551956: 18 January 1956 to 23 December 19561957: 18 February 1957 to 28 December 19571958: 6 January 1958 to 23 December 19581959: 2 February 1959 to 16 December 19591960: 1 January 1960 to 31 December 19601961: 7 January 1961 to 17 December 19611962: 4 January 1962 to 29 December 19621963: 5 January 1963 to 21 December 19631964: 16 January 1964 to 10 December 19641965: 3 January 1965 to 19 December 19651966: 5 January 1966 to 27 December 19661967: 13 January 1967 to 31 December 19671968: 3 January 1968 to 22 December 19681969: 2 January 1969 to 30 December 19691904190919141950195519601965JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Riverside meeting 10 mm (0.39 in).
First to last qualifying date each year at Riverside
YearFirst dateLast date
19041904-01-251904-12-26
19051905-01-121905-12-30
19061906-01-021906-12-30
19071907-01-021907-12-22
19081908-01-061908-11-30
19091909-02-051909-12-25
19101910-01-061910-12-23
19111911-02-091911-12-30
19121912-01-111912-12-30
19131913-01-111913-12-28
19141914-02-131914-12-29
19161916-01-021916-12-26
19471947-01-011947-12-15
19481948-01-011948-12-29
19491949-01-161949-12-27
19501950-01-011950-11-03
19511951-01-021951-12-25
19521952-01-271952-12-31
19531953-01-231953-12-28
19541954-01-101954-12-28
19551955-01-151955-12-02
19561956-01-181956-12-23
19571957-02-181957-12-28
19581958-01-061958-12-23
19591959-02-021959-12-16
19601960-01-011960-12-31
19611961-01-071961-12-17
19621962-01-041962-12-29
19631963-01-051963-12-21
19641964-01-161964-12-10
19651965-01-031965-12-19
19661966-01-051966-12-27
19671967-01-131967-12-31
19681968-01-031968-12-22
19691969-01-021969-12-30

Every Fixed Threshold

Fixed thresholds at Riverside
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3546195728
25 mm (0.98 in): Days with 25 mm or more rain3524191115
50 mm (1.97 in): Days with 50 mm or more rain32819684
100 mm (3.94 in): Days with 100 mm or more rain12219471
10 cm (3.9 in): Days with 10 cm or more snowfall1119491

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1904.

Download the Data

  • Data for Riverside 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).