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

Isabella Threshold Days by Year (USC00404517)

11 fixed thresholds counted per year at Isabella (USC00404517): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Isabella Thresholds

  • Isabella: days with 10 mm (0.39 in) or more of precipitation in 5 years, most in 1950 with 48.
  • Isabella: days with 25 mm (0.98 in) or more of precipitation in 5 years, most in 1905 with 14.
  • Isabella: nights with a minimum temperature at or below 0 C (32 F) in 4 years, most in 1904 with 102.
  • Isabella: nights with a minimum temperature at or below -10 C (14 F) in 4 years, most in 1905 with 11.
  • 11 fixed thresholds have at least one qualifying day at Isabella.
3 years with a qualifying day
Days at or above 30 C (86 F) per year at Isabella Days per year at Isabella with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 81 in 1905. 02550751001903: 601904: 541905: 81190319041905
Days per year at Isabella with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 81 in 1905.
Days at or above 30 C (86 F) per year at Isabella
YearDaysDecade average
19036065
19045465
19058165
First to last qualifying date each year at Isabella For each year, a bar from the first to the last day at Isabella meeting 30 C (86 F). 1903: 21 May 1903 to 15 September 19031904: 23 May 1904 to 30 September 19041905: 5 May 1905 to 28 September 1905190319041905JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Isabella meeting 30 C (86 F).
First to last qualifying date each year at Isabella
YearFirst dateLast date
19031903-05-211903-09-15
19041904-05-231904-09-30
19051905-05-051905-09-28

Every Fixed Threshold

Fixed thresholds at Isabella
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days381190581
90 F (32.2 C): Days329190529
0 C (32 F): Ice days (max3619056
0 C (32 F): Frost days (min4102190474
-10 C (14 F): Days with min411190511
-20 C (-4 F): Days with min1219052
20 C (68 F): Tropical nights (min441190541
10 mm (0.39 in): Days with 10 mm or more rain548195048
25 mm (0.98 in): Days with 25 mm or more rain514190513
50 mm (1.97 in): Days with 50 mm or more rain4519054
100 mm (3.94 in): Days with 100 mm or more rain1119491

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1903.

Download the Data

  • Data for Isabella 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).