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

Ione Threshold Days by Year (USC00044283)

11 fixed thresholds counted per year at Ione (USC00044283): 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 22 years, most in 1909 with 32.
  • Ione: days with 25 mm (0.98 in) or more of precipitation in 21 years, most in 1911 with 12.
  • Ione: days with 50 mm (1.97 in) or more of precipitation in 4 years, most in 1963 with 3.
  • Ione: days with a maximum temperature at or above 30 C (86 F) in 3 years, most in 1917 with 102.
  • 11 fixed thresholds have at least one qualifying day at Ione.
3 years with a qualifying day
Days at or above 30 C (86 F) per year at Ione Days per year at Ione with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 102 in 1917. 0501001501915: 681916: 631917: 102191519161917
Days per year at Ione with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 102 in 1917.
Days at or above 30 C (86 F) per year at Ione
YearDaysDecade average
19156877.7
19166377.7
191710277.7
First to last qualifying date each year at Ione For each year, a bar from the first to the last day at Ione meeting 30 C (86 F). 1915: 2 June 1915 to 6 October 19151916: 2 May 1916 to 29 September 19161917: 31 May 1917 to 11 October 1917191519161917JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Ione meeting 30 C (86 F).
First to last qualifying date each year at Ione
YearFirst dateLast date
19151915-06-021915-10-06
19161916-05-021916-09-29
19171917-05-311917-10-11

Every Fixed Threshold

Fixed thresholds at Ione
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days31021917102
35 C (95 F): Days331191731
40 C (104 F): Days2619176
90 F (32.2 C): Days371191771
100 F (37.8 C): Days317191717
0 C (32 F): Frost days (min346191746
20 C (68 F): Tropical nights (min335191735
25 C (77 F): Days with min2219152
10 mm (0.39 in): Days with 10 mm or more rain223219094
25 mm (0.98 in): Days with 25 mm or more rain211219112
50 mm (1.97 in): Days with 50 mm or more rain4319631

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1915.

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).