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

Palermo Threshold Days by Year (USC00306375)

15 fixed thresholds counted per year at Palermo (USC00306375): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Palermo Thresholds

  • Palermo: days with 10 mm (0.39 in) or more of precipitation in 21 years, most in 1925 with 40.
  • Palermo: days with 25 mm (0.98 in) or more of precipitation in 21 years, most in 1904 with 13.
  • Palermo: days with 50 mm (1.97 in) or more of precipitation in 11 years, most in 1904 with 5.
  • Palermo: days with a maximum temperature at or above 30 C (86 F) in 7 years, most in 1898 with 28.
  • 15 fixed thresholds have at least one qualifying day at Palermo.
7 years with a qualifying day
Days at or above 30 C (86 F) per year at Palermo Days per year at Palermo with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 28 in 1898. 01020301893: 141895: 271896: 251897: 151898: 281899: 281900: 211893189518961897189818991900
Days per year at Palermo with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 28 in 1898.
Days at or above 30 C (86 F) per year at Palermo
YearDaysDecade average
18931422.8
18952722.8
18962522.8
18971522.8
18982822.8
18992822.8
19002121
First to last qualifying date each year at Palermo For each year, a bar from the first to the last day at Palermo meeting 30 C (86 F). 1893: 3 June 1893 to 16 August 18931895: 5 May 1895 to 23 September 18951896: 7 June 1896 to 27 August 18961897: 23 June 1897 to 16 September 18971898: 7 June 1898 to 4 September 18981899: 30 April 1899 to 17 September 18991900: 17 May 1900 to 1 September 19001893189518961897189818991900JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Palermo meeting 30 C (86 F).
First to last qualifying date each year at Palermo
YearFirst dateLast date
18931893-06-031893-08-16
18951895-05-051895-09-23
18961896-06-071896-08-27
18971897-06-231897-09-16
18981898-06-071898-09-04
18991899-04-301899-09-17
19001900-05-171900-09-01

Every Fixed Threshold

Fixed thresholds at Palermo
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days728189821
35 C (95 F): Days5418982
90 F (32.2 C): Days717189811
0 C (32 F): Ice days (max777189666
0 C (32 F): Frost days (min71551895150
-10 C (14 F): Days with min767189359
-20 C (-4 F): Days with min71018963
-30 C (-22 F): Days with min2218961
20 C (68 F): Tropical nights (min613189811
10 mm (0.39 in): Days with 10 mm or more rain2140192540
25 mm (0.98 in): Days with 25 mm or more rain211319046
50 mm (1.97 in): Days with 50 mm or more rain11519041
10 cm (3.9 in): Days with 10 cm or more snowfall111192511
25 cm (9.8 in): Days with 25 cm or more snowfall1419254
50 cm (19.7 in): Days with 50 cm or more snowfall1119251

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1893.

Download the Data

  • Data for Palermo 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).