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Built 2026-10-19 (19 October 2026)

Ione Threshold Days by Year (USC00294306)

6 fixed thresholds counted per year at Ione (USC00294306): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ione Thresholds

  • Ione: days with 10 mm (0.39 in) or more of precipitation in 48 years, most in 1941 with 30.
  • Ione: days with 25 mm (0.98 in) or more of precipitation in 45 years, most in 1919 with 13.
  • Ione: days with 10 cm (3.9 in) or more of snowfall in 26 years, most in 1918 with 5.
  • Ione: days with 50 mm (1.97 in) or more of precipitation in 24 years, most in 1919 with 5.
  • 6 fixed thresholds have at least one qualifying day at Ione.
48 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Ione Days per year at Ione with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 30 in 1941. 01020301911: 141912: 151913: 121914: 131916: 51917: 101918: 171919: 271920: 151921: 161922: 101923: 281924: 111925: 161926: 171927: 151928: 161929: 111930: 101931: 151932: 161933: 71934: 61935: 101936: 121937: 121938: 131939: 151940: 91941: 301942: 161943: 71944: 131945: 81946: 131947: 91948: 111949: 141950: 81951: 91952: 71953: 51954: 91955: 91956: 31957: 131958: 181959: 121911191719221927193219371942194719521957
Days per year at Ione with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 30 in 1941.
Days with 10 mm (0.39 in) or more of precipitation per year at Ione
YearDaysDecade average
19111414.1
19121514.1
19131214.1
19141314.1
1916514.1
19171014.1
19181714.1
19192714.1
19201515.5
19211615.5
19221015.5
19232815.5
19241115.5
19251615.5
19261715.5
19271515.5
19281615.5
19291115.5
19301011.6
19311511.6
19321611.6
1933711.6
1934611.6
19351011.6
19361211.6
19371211.6
19381311.6
19391511.6
1940913
19413013
19421613
1943713
19441313
1945813
19461313
1947913
19481113
19491413
195089.3
195199.3
195279.3
195359.3
195499.3
195599.3
195639.3
1957139.3
1958189.3
1959129.3
First to last qualifying date each year at Ione For each year, a bar from the first to the last day at Ione meeting 10 mm (0.39 in). 1911: 18 February 1911 to 5 October 19111912: 19 February 1912 to 11 September 19121913: 20 April 1913 to 21 December 19131914: 29 April 1914 to 18 December 19141916: 4 June 1916 to 20 August 19161917: 6 May 1917 to 15 November 19171918: 21 March 1918 to 31 December 19181919: 21 March 1919 to 8 November 19191920: 7 May 1920 to 30 October 19201921: 22 January 1921 to 30 August 19211922: 2 April 1922 to 23 November 19221923: 3 March 1923 to 21 December 19231924: 21 March 1924 to 9 December 19241925: 22 April 1925 to 15 October 19251926: 29 March 1926 to 8 December 19261927: 11 March 1927 to 28 October 19271928: 5 April 1928 to 12 December 19281929: 27 March 1929 to 9 November 19291930: 10 May 1930 to 11 October 19301931: 25 March 1931 to 20 October 19311932: 11 March 1932 to 15 December 19321933: 6 June 1933 to 27 August 19331934: 21 May 1934 to 17 October 19341935: 6 January 1935 to 26 November 19351936: 8 May 1936 to 27 August 19361937: 19 April 1937 to 13 December 19371938: 20 February 1938 to 19 December 19381939: 7 January 1939 to 24 December 19391940: 7 May 1940 to 24 November 19401941: 22 March 1941 to 29 October 19411942: 28 February 1942 to 17 October 19421943: 22 May 1943 to 10 December 19431944: 7 January 1944 to 28 September 19441945: 20 January 1945 to 30 September 19451946: 28 May 1946 to 6 November 19461947: 9 May 1947 to 3 December 19471948: 1 March 1948 to 31 October 19481949: 12 February 1949 to 8 September 19491950: 13 July 1950 to 24 September 19501951: 23 February 1951 to 10 August 19511952: 10 May 1952 to 29 August 19521953: 28 May 1953 to 3 December 19531954: 11 May 1954 to 27 September 19541955: 9 April 1955 to 25 September 19551956: 24 May 1956 to 17 July 19561957: 5 March 1957 to 25 October 19571958: 5 March 1958 to 17 November 19581959: 8 May 1959 to 26 December 195919111918192419301936194219481954JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Ione meeting 10 mm (0.39 in).
First to last qualifying date each year at Ione
YearFirst dateLast date
19111911-02-181911-10-05
19121912-02-191912-09-11
19131913-04-201913-12-21
19141914-04-291914-12-18
19161916-06-041916-08-20
19171917-05-061917-11-15
19181918-03-211918-12-31
19191919-03-211919-11-08
19201920-05-071920-10-30
19211921-01-221921-08-30
19221922-04-021922-11-23
19231923-03-031923-12-21
19241924-03-211924-12-09
19251925-04-221925-10-15
19261926-03-291926-12-08
19271927-03-111927-10-28
19281928-04-051928-12-12
19291929-03-271929-11-09
19301930-05-101930-10-11
19311931-03-251931-10-20
19321932-03-111932-12-15
19331933-06-061933-08-27
19341934-05-211934-10-17
19351935-01-061935-11-26
19361936-05-081936-08-27
19371937-04-191937-12-13
19381938-02-201938-12-19
19391939-01-071939-12-24
19401940-05-071940-11-24
19411941-03-221941-10-29
19421942-02-281942-10-17
19431943-05-221943-12-10
19441944-01-071944-09-28
19451945-01-201945-09-30
19461946-05-281946-11-06
19471947-05-091947-12-03
19481948-03-011948-10-31
19491949-02-121949-09-08
19501950-07-131950-09-24
19511951-02-231951-08-10
19521952-05-101952-08-29
19531953-05-281953-12-03
19541954-05-111954-09-27
19551955-04-091955-09-25
19561956-05-241956-07-17
19571957-03-051957-10-25
19581958-03-051958-11-17
19591959-05-081959-12-26

Every Fixed Threshold

Fixed thresholds at Ione
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain4830194112
25 mm (0.98 in): Days with 25 mm or more rain451319194
50 mm (1.97 in): Days with 50 mm or more rain24519191
100 mm (3.94 in): Days with 100 mm or more rain5119211
10 cm (3.9 in): Days with 10 cm or more snowfall26519183
25 cm (9.8 in): Days with 25 cm or more snowfall3119381

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1911.

Download the Data

  • Data for Ione 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).