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

Poretta Threshold Days by Year (FRM00007790)

7 fixed thresholds counted per year at Poretta (FRM00007790): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Poretta Thresholds

  • Poretta: days with 10 mm (0.39 in) or more of precipitation in 36 years, most in 1976 with 33.
  • Poretta: days with 25 mm (0.98 in) or more of precipitation in 36 years, most in 1979 with 15.
  • Poretta: days with 50 mm (1.97 in) or more of precipitation in 33 years, most in 1980 with 4.
  • Poretta: days with 100 mm (3.94 in) or more of precipitation in 14 years, most in 1980 with 2.
  • 7 fixed thresholds have at least one qualifying day at Poretta.
5 years with a qualifying day
Days at or above 30 C (86 F) per year at Poretta Days per year at Poretta with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 21 in 2001. 01020301974: 121976: 41977: 72000: 172001: 2119741976197720002001
Days per year at Poretta with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 21 in 2001.
Days at or above 30 C (86 F) per year at Poretta
YearDaysDecade average
1974127.7
197647.7
197777.7
20001719
20012119
First to last qualifying date each year at Poretta For each year, a bar from the first to the last day at Poretta meeting 30 C (86 F). 1974: 29 June 1974 to 20 August 19741976: 1 July 1976 to 17 July 19761977: 15 March 1977 to 19 August 19772000: 5 July 2000 to 2 September 20002001: 2 July 2001 to 1 September 200119741976197720002001JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Poretta meeting 30 C (86 F).
First to last qualifying date each year at Poretta
YearFirst dateLast date
19741974-06-291974-08-20
19761976-07-011976-07-17
19771977-03-151977-08-19
20002000-07-052000-09-02
20012001-07-022001-09-01

Every Fixed Threshold

Fixed thresholds at Poretta
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days521200121
90 F (32.2 C): Days2320013
10 mm (0.39 in): Days with 10 mm or more rain3633197635
25 mm (0.98 in): Days with 25 mm or more rain3615197910
50 mm (1.97 in): Days with 50 mm or more rain33419803
100 mm (3.94 in): Days with 100 mm or more rain14219801
200 mm (7.87 in): Days with 200 mm or more rain3119771

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1974.

Download the Data

  • Data for Poretta 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).