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Built 2026-10-18 (18 October 2026)

Shannon Threshold Days by Year

10 fixed thresholds counted per year at Shannon (ASN00009968): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Shannon Thresholds

  • Shannon: days with a maximum temperature at or above 30 C (86 F) in 25 years, most in 2011 with 38.
  • Shannon: days with a maximum temperature at or above 90 F (32.2 C) in 25 years, most in 2010 with 21.
  • Shannon: days with 10 mm (0.39 in) or more of precipitation in 25 years, most in 2008 with 52.
  • Shannon: days with 25 mm (0.98 in) or more of precipitation in 25 years, most in 2005 with 12.
  • 10 fixed thresholds have at least one qualifying day at Shannon.
25 years with a qualifying day
Days at or above 30 C (86 F) per year at Shannon Days per year at Shannon with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 38 in 2011. 0102030401997: 272000: 272001: 222002: 322003: 342004: 332005: 272006: 342007: 312008: 172009: 222010: 322011: 382015: 292016: 252017: 242018: 142019: 292020: 352021: 282022: 332023: 272024: 322025: 292026: 14199720022005200820112017202020232026
Days per year at Shannon with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 38 in 2011.
Days at or above 30 C (86 F) per year at Shannon
YearDaysDecade average
19972727
20002727.9
20012227.9
20023227.9
20033427.9
20043327.9
20052727.9
20063427.9
20073127.9
20081727.9
20092227.9
20103227.3
20113827.3
20152927.3
20162527.3
20172427.3
20181427.3
20192927.3
20203528.3
20212828.3
20223328.3
20232728.3
20243228.3
20252928.3
20261428.3
First to last qualifying date each year at Shannon For each year, a bar from the first to the last day at Shannon meeting 30 C (86 F). 1997: 2 January 1997 to 29 December 19972000: 1 January 2000 to 28 December 20002001: 5 January 2001 to 13 November 20012002: 16 January 2002 to 27 December 20022003: 3 January 2003 to 27 December 20032004: 9 January 2004 to 28 December 20042005: 1 January 2005 to 15 November 20052006: 6 January 2006 to 31 December 20062007: 13 January 2007 to 26 December 20072008: 3 January 2008 to 5 March 20082009: 2 January 2009 to 28 December 20092010: 3 January 2010 to 27 December 20102011: 2 January 2011 to 29 December 20112015: 4 January 2015 to 28 December 20152016: 2 January 2016 to 21 December 20162017: 2 January 2017 to 25 December 20172018: 2 January 2018 to 22 December 20182019: 1 January 2019 to 26 December 20192020: 5 January 2020 to 31 December 20202021: 6 January 2021 to 29 December 20212022: 5 January 2022 to 29 December 20222023: 4 January 2023 to 25 December 20232024: 7 January 2024 to 31 December 20242025: 1 January 2025 to 25 December 20252026: 4 January 2026 to 18 March 20261997200320072011201820222026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Shannon meeting 30 C (86 F).
First to last qualifying date each year at Shannon
YearFirst dateLast date
19971997-01-021997-12-29
20002000-01-012000-12-28
20012001-01-052001-11-13
20022002-01-162002-12-27
20032003-01-032003-12-27
20042004-01-092004-12-28
20052005-01-012005-11-15
20062006-01-062006-12-31
20072007-01-132007-12-26
20082008-01-032008-03-05
20092009-01-022009-12-28
20102010-01-032010-12-27
20112011-01-022011-12-29
20152015-01-042015-12-28
20162016-01-022016-12-21
20172017-01-022017-12-25
20182018-01-022018-12-22
20192019-01-012019-12-26
20202020-01-052020-12-31
20212021-01-062021-12-29
20222022-01-052022-12-29
20232023-01-042023-12-25
20242024-01-072024-12-31
20252025-01-012025-12-25
20262026-01-042026-03-18

Every Fixed Threshold

Fixed thresholds at Shannon
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2538201114
35 C (95 F): Days241320044
40 C (104 F): Days7320071
90 F (32.2 C): Days252120108
100 F (37.8 C): Days20620031
0 C (32 F): Frost days (min7420062
20 C (68 F): Tropical nights (min12420001
10 mm (0.39 in): Days with 10 mm or more rain2552200824
25 mm (0.98 in): Days with 25 mm or more rain251220054
50 mm (1.97 in): Days with 50 mm or more rain6320053

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1997.

Download the Data

  • Data for Shannon 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 (2026-10-17).