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Built 2026-10-15 (15 October 2026)

Riverside Threshold Days by Year

4 fixed thresholds counted per year at Riverside (ASN00008113): 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 93 years, most in 1963 with 22.
  • Riverside: days with 25 mm (0.98 in) or more of precipitation in 73 years, most in 1984 with 7.
  • Riverside: days with 50 mm (1.97 in) or more of precipitation in 20 years, most in 1965 with 3.
  • Riverside: days with 100 mm (3.94 in) or more of precipitation in 2 years, most in 1965 with 1.
  • 4 fixed thresholds have at least one qualifying day at Riverside.
93 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 22 in 1963. 01020301930: 51931: 101932: 141933: 91934: 111935: 71936: 51937: 51938: 51939: 121940: 41941: 81942: 51943: 91944: 71945: 101946: 131947: 91948: 81949: 91950: 61951: 111952: 51953: 101954: 41955: 101956: 61957: 91958: 141959: 71960: 71961: 101962: 81963: 221964: 61965: 51966: 51967: 111968: 121969: 81970: 91971: 101972: 71973: 41974: 151975: 141976: 31977: 31978: 101979: 71980: 101981: 71982: 71983: 91984: 151985: 51986: 91987: 81988: 81989: 101990: 91991: 81992: 111993: 71994: 81995: 121996: 141997: 111998: 131999: 52000: 92001: 112002: 42003: 72004: 52005: 102006: 52011: 152012: 62013: 42014: 72015: 112016: 52017: 92018: 62019: 72020: 62021: 112022: 102023: 32024: 182025: 62026: 61930194019501960197019801990200020142024
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 22 in 1963.
Days with 10 mm (0.39 in) or more of precipitation per year at Riverside
YearDaysDecade average
193058.3
1931108.3
1932148.3
193398.3
1934118.3
193578.3
193658.3
193758.3
193858.3
1939128.3
194048.2
194188.2
194258.2
194398.2
194478.2
1945108.2
1946138.2
194798.2
194888.2
194998.2
195068.2
1951118.2
195258.2
1953108.2
195448.2
1955108.2
195668.2
195798.2
1958148.2
195978.2
196079.4
1961109.4
196289.4
1963229.4
196469.4
196559.4
196659.4
1967119.4
1968129.4
196989.4
197098.2
1971108.2
197278.2
197348.2
1974158.2
1975148.2
197638.2
197738.2
1978108.2
197978.2
1980108.8
198178.8
198278.8
198398.8
1984158.8
198558.8
198698.8
198788.8
198888.8
1989108.8
199099.8
199189.8
1992119.8
199379.8
199489.8
1995129.8
1996149.8
1997119.8
1998139.8
199959.8
200097.3
2001117.3
200247.3
200377.3
200457.3
2005107.3
200657.3
2011157.8
201267.8
201347.8
201477.8
2015117.8
201657.8
201797.8
201867.8
201977.8
202068.6
2021118.6
2022108.6
202338.6
2024188.6
202568.6
202668.6
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). 1930: 8 May 1930 to 26 June 19301931: 3 May 1931 to 28 December 19311932: 29 January 1932 to 19 December 19321933: 7 March 1933 to 30 August 19331934: 14 January 1934 to 12 August 19341935: 6 January 1935 to 5 August 19351936: 19 April 1936 to 21 November 19361937: 18 May 1937 to 27 August 19371938: 15 March 1938 to 26 July 19381939: 13 February 1939 to 10 November 19391940: 13 May 1940 to 27 July 19401941: 5 April 1941 to 18 September 19411942: 17 May 1942 to 7 July 19421943: 31 January 1943 to 30 July 19431944: 24 May 1944 to 27 August 19441945: 4 February 1945 to 15 August 19451946: 12 February 1946 to 17 October 19461947: 6 February 1947 to 25 October 19471948: 16 March 1948 to 28 August 19481949: 17 February 1949 to 10 December 19491950: 16 May 1950 to 30 August 19501951: 21 February 1951 to 1 October 19511952: 1 May 1952 to 28 July 19521953: 23 March 1953 to 23 June 19531954: 20 June 1954 to 20 August 19541955: 12 January 1955 to 18 August 19551956: 4 March 1956 to 29 July 19561957: 18 March 1957 to 23 August 19571958: 24 January 1958 to 21 September 19581959: 2 June 1959 to 12 December 19591960: 4 February 1960 to 10 September 19601961: 14 April 1961 to 29 August 19611962: 24 May 1962 to 10 July 19621963: 14 January 1963 to 20 August 19631964: 11 June 1964 to 25 September 19641965: 6 June 1965 to 20 July 19651966: 4 April 1966 to 14 July 19661967: 22 January 1967 to 19 December 19671968: 27 January 1968 to 10 September 19681969: 15 May 1969 to 4 November 19691970: 17 February 1970 to 1 December 19701971: 31 January 1971 to 15 August 19711972: 31 May 1972 to 11 September 19721973: 5 June 1973 to 24 July 19731974: 2 January 1974 to 20 October 19741975: 20 February 1975 to 9 December 19751976: 27 February 1976 to 15 August 19761977: 27 April 1977 to 10 August 19771978: 16 January 1978 to 2 November 19781979: 15 February 1979 to 17 August 19791980: 6 May 1980 to 26 August 19801981: 25 May 1981 to 1 August 19811982: 21 January 1982 to 15 September 19821983: 3 May 1983 to 16 November 19831984: 27 January 1984 to 8 October 19841985: 5 June 1985 to 22 September 19851986: 30 January 1986 to 30 July 19861987: 30 March 1987 to 26 August 19871988: 11 March 1988 to 18 December 19881989: 1 May 1989 to 18 August 19891990: 28 January 1990 to 3 August 19901991: 21 April 1991 to 2 July 19911992: 17 March 1992 to 19 September 19921993: 8 February 1993 to 13 November 19931994: 1 March 1994 to 11 August 19941995: 23 March 1995 to 14 December 19951996: 20 April 1996 to 6 November 19961997: 24 February 1997 to 12 November 19971998: 7 March 1998 to 1 August 19981999: 19 May 1999 to 21 September 19992000: 2 January 2000 to 16 August 20002001: 27 February 2001 to 20 October 20012002: 4 February 2002 to 2 September 20022003: 16 May 2003 to 22 August 20032004: 8 May 2004 to 24 September 20042005: 1 April 2005 to 17 August 20052006: 7 February 2006 to 20 December 20062011: 6 February 2011 to 27 October 20112012: 7 June 2012 to 27 December 20122013: 13 January 2013 to 25 August 20132014: 27 April 2014 to 22 September 20142015: 2 February 2015 to 31 July 20152016: 25 May 2016 to 17 July 20162017: 29 January 2017 to 10 December 20172018: 15 January 2018 to 21 December 20182019: 6 June 2019 to 29 August 20192020: 25 May 2020 to 2 November 20202021: 20 January 2021 to 18 October 20212022: 15 February 2022 to 2 September 20222023: 2 March 2023 to 30 March 20232024: 25 February 2024 to 25 November 20242025: 3 July 2025 to 5 September 20252026: 10 February 2026 to 18 July 202619301942195419661978199020022018JanFebMarAprMayJunJulAugSepOctNovDec
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
19301930-05-081930-06-26
19311931-05-031931-12-28
19321932-01-291932-12-19
19331933-03-071933-08-30
19341934-01-141934-08-12
19351935-01-061935-08-05
19361936-04-191936-11-21
19371937-05-181937-08-27
19381938-03-151938-07-26
19391939-02-131939-11-10
19401940-05-131940-07-27
19411941-04-051941-09-18
19421942-05-171942-07-07
19431943-01-311943-07-30
19441944-05-241944-08-27
19451945-02-041945-08-15
19461946-02-121946-10-17
19471947-02-061947-10-25
19481948-03-161948-08-28
19491949-02-171949-12-10
19501950-05-161950-08-30
19511951-02-211951-10-01
19521952-05-011952-07-28
19531953-03-231953-06-23
19541954-06-201954-08-20
19551955-01-121955-08-18
19561956-03-041956-07-29
19571957-03-181957-08-23
19581958-01-241958-09-21
19591959-06-021959-12-12
19601960-02-041960-09-10
19611961-04-141961-08-29
19621962-05-241962-07-10
19631963-01-141963-08-20
19641964-06-111964-09-25
19651965-06-061965-07-20
19661966-04-041966-07-14
19671967-01-221967-12-19
19681968-01-271968-09-10
19691969-05-151969-11-04
19701970-02-171970-12-01
19711971-01-311971-08-15
19721972-05-311972-09-11
19731973-06-051973-07-24
19741974-01-021974-10-20
19751975-02-201975-12-09
19761976-02-271976-08-15
19771977-04-271977-08-10
19781978-01-161978-11-02
19791979-02-151979-08-17
19801980-05-061980-08-26
19811981-05-251981-08-01
19821982-01-211982-09-15
19831983-05-031983-11-16
19841984-01-271984-10-08
19851985-06-051985-09-22
19861986-01-301986-07-30
19871987-03-301987-08-26
19881988-03-111988-12-18
19891989-05-011989-08-18
19901990-01-281990-08-03
19911991-04-211991-07-02
19921992-03-171992-09-19
19931993-02-081993-11-13
19941994-03-011994-08-11
19951995-03-231995-12-14
19961996-04-201996-11-06
19971997-02-241997-11-12
19981998-03-071998-08-01
19991999-05-191999-09-21
20002000-01-022000-08-16
20012001-02-272001-10-20
20022002-02-042002-09-02
20032003-05-162003-08-22
20042004-05-082004-09-24
20052005-04-012005-08-17
20062006-02-072006-12-20
20112011-02-062011-10-27
20122012-06-072012-12-27
20132013-01-132013-08-25
20142014-04-272014-09-22
20152015-02-022015-07-31
20162016-05-252016-07-17
20172017-01-292017-12-10
20182018-01-152018-12-21
20192019-06-062019-08-29
20202020-05-252020-11-02
20212021-01-202021-10-18
20222022-02-152022-09-02
20232023-03-022023-03-30
20242024-02-252024-11-25
20252025-07-032025-09-05
20262026-02-102026-07-18

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 rain932219636
25 mm (0.98 in): Days with 25 mm or more rain73719842
50 mm (1.97 in): Days with 50 mm or more rain20319652
100 mm (3.94 in): Days with 100 mm or more rain2119651

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1930.

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 2026-10-14 (14 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2026-10-12).