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

Porterville Threshold Days by Year (USC00227141)

14 fixed thresholds counted per year at Porterville (USC00227141): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Porterville Thresholds

  • Porterville: days with 10 mm (0.39 in) or more of precipitation in 9 years, most in 1913 with 47.
  • Porterville: days with 25 mm (0.98 in) or more of precipitation in 9 years, most in 1906 with 18.
  • Porterville: days with 50 mm (1.97 in) or more of precipitation in 9 years, most in 1915 with 5.
  • Porterville: nights with a minimum temperature at or below 0 C (32 F) in 8 years, most in 1914 with 63.
  • 14 fixed thresholds have at least one qualifying day at Porterville.
7 years with a qualifying day
Days at or above 30 C (86 F) per year at Porterville Days per year at Porterville with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 142 in 1915. 0501001501906: 1261908: 1281910: 1371911: 1411913: 1201914: 1291915: 1421906190819101911191319141915
Days per year at Porterville with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 142 in 1915.
Days at or above 30 C (86 F) per year at Porterville
YearDaysDecade average
1906126127
1908128127
1910137133.8
1911141133.8
1913120133.8
1914129133.8
1915142133.8
First to last qualifying date each year at Porterville For each year, a bar from the first to the last day at Porterville meeting 30 C (86 F). 1906: 10 April 1906 to 29 September 19061908: 17 March 1908 to 20 October 19081910: 24 March 1910 to 20 October 19101911: 11 March 1911 to 19 October 19111913: 18 April 1913 to 10 October 19131914: 30 March 1914 to 12 October 19141915: 17 April 1915 to 1 November 19151906190819101911191319141915JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Porterville meeting 30 C (86 F).
First to last qualifying date each year at Porterville
YearFirst dateLast date
19061906-04-101906-09-29
19081908-03-171908-10-20
19101910-03-241910-10-20
19111911-03-111911-10-19
19131913-04-181913-10-10
19141914-03-301914-10-12
19151915-04-171915-11-01

Every Fixed Threshold

Fixed thresholds at Porterville
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days71421915142
35 C (95 F): Days759191143
40 C (104 F): Days3419141
90 F (32.2 C): Days7102191199
100 F (37.8 C): Days61619119
0 C (32 F): Ice days (max3219141
0 C (32 F): Frost days (min863191458
-10 C (14 F): Days with min3219142
20 C (68 F): Tropical nights (min890191168
25 C (77 F): Days with min3419144
10 mm (0.39 in): Days with 10 mm or more rain947191345
25 mm (0.98 in): Days with 25 mm or more rain918190613
50 mm (1.97 in): Days with 50 mm or more rain9519155
100 mm (3.94 in): Days with 100 mm or more rain3119061

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1906.

Download the Data

  • Data for Porterville 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).