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Built 2026-10-19 (19 October 2026)

Rhyll Threshold Days by Year (ASN00086373)

12 fixed thresholds counted per year at Rhyll (ASN00086373): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rhyll Thresholds

  • Rhyll: days with a maximum temperature at or above 30 C (86 F) in 36 years, most in 2025 with 21.
  • Rhyll: days with a maximum temperature at or above 90 F (32.2 C) in 36 years, most in 2025 with 15.
  • Rhyll: nights with a minimum temperature at or above 20 C (68 F) in 35 years, most in 2018 with 11.
  • Rhyll: days with 10 mm (0.39 in) or more of precipitation in 31 years, most in 2010 with 29.
  • 12 fixed thresholds have at least one qualifying day at Rhyll.
36 years with a qualifying day
Days at or above 30 C (86 F) per year at Rhyll Days per year at Rhyll with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 21 in 2025. 01020301991: 101992: 51993: 91994: 91995: 111996: 31997: 141998: 121999: 122000: 172001: 162002: 142003: 172004: 112005: 132006: 152007: 202008: 182009: 182010: 152011: 52012: 142013: 202014: 182015: 182016: 162017: 142018: 162019: 192020: 72021: 92022: 102023: 122024: 142025: 212026: 9199119951999200320072011201520192023
Days per year at Rhyll with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 21 in 2025.
Days at or above 30 C (86 F) per year at Rhyll
YearDaysDecade average
1991109.4
199259.4
199399.4
199499.4
1995119.4
199639.4
1997149.4
1998129.4
1999129.4
20001715.9
20011615.9
20021415.9
20031715.9
20041115.9
20051315.9
20061515.9
20072015.9
20081815.9
20091815.9
20101515.5
2011515.5
20121415.5
20132015.5
20141815.5
20151815.5
20161615.5
20171415.5
20181615.5
20191915.5
2020711.7
2021911.7
20221011.7
20231211.7
20241411.7
20252111.7
2026911.7
First to last qualifying date each year at Rhyll For each year, a bar from the first to the last day at Rhyll meeting 30 C (86 F). 1991: 2 January 1991 to 26 December 19911992: 19 January 1992 to 10 March 19921993: 14 January 1993 to 11 December 19931994: 24 January 1994 to 28 December 19941995: 4 January 1995 to 7 March 19951996: 14 January 1996 to 21 December 19961997: 4 January 1997 to 26 November 19971998: 9 January 1998 to 25 December 19981999: 2 January 1999 to 15 December 19992000: 14 January 2000 to 21 December 20002001: 1 January 2001 to 29 December 20012002: 6 January 2002 to 30 December 20022003: 7 January 2003 to 30 December 20032004: 20 January 2004 to 31 December 20042005: 11 January 2005 to 31 December 20052006: 19 January 2006 to 14 December 20062007: 4 January 2007 to 31 December 20072008: 1 January 2008 to 24 March 20082009: 13 January 2009 to 31 December 20092010: 8 January 2010 to 31 December 20102011: 8 January 2011 to 31 December 20112012: 2 January 2012 to 23 December 20122013: 4 January 2013 to 28 December 20132014: 10 January 2014 to 8 November 20142015: 2 January 2015 to 31 December 20152016: 11 January 2016 to 28 December 20162017: 6 January 2017 to 27 December 20172018: 6 January 2018 to 28 December 20182019: 4 January 2019 to 30 December 20192020: 15 January 2020 to 15 December 20202021: 11 January 2021 to 31 December 20212022: 1 January 2022 to 27 December 20222023: 1 January 2023 to 8 December 20232024: 6 January 2024 to 20 December 20242025: 4 January 2025 to 18 December 20252026: 7 January 2026 to 28 February 202619911996200120062011201620212026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Rhyll meeting 30 C (86 F).
First to last qualifying date each year at Rhyll
YearFirst dateLast date
19911991-01-021991-12-26
19921992-01-191992-03-10
19931993-01-141993-12-11
19941994-01-241994-12-28
19951995-01-041995-03-07
19961996-01-141996-12-21
19971997-01-041997-11-26
19981998-01-091998-12-25
19991999-01-021999-12-15
20002000-01-142000-12-21
20012001-01-012001-12-29
20022002-01-062002-12-30
20032003-01-072003-12-30
20042004-01-202004-12-31
20052005-01-112005-12-31
20062006-01-192006-12-14
20072007-01-042007-12-31
20082008-01-012008-03-24
20092009-01-132009-12-31
20102010-01-082010-12-31
20112011-01-082011-12-31
20122012-01-022012-12-23
20132013-01-042013-12-28
20142014-01-102014-11-08
20152015-01-022015-12-31
20162016-01-112016-12-28
20172017-01-062017-12-27
20182018-01-062018-12-28
20192019-01-042019-12-30
20202020-01-152020-12-15
20212021-01-112021-12-31
20222022-01-012022-12-27
20232023-01-012023-12-08
20242024-01-062024-12-20
20252025-01-042025-12-18
20262026-01-072026-02-28

Every Fixed Threshold

Fixed thresholds at Rhyll
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days362120259
35 C (95 F): Days26720253
40 C (104 F): Days2120091
90 F (32.2 C): Days361520254
100 F (37.8 C): Days7320091
0 C (32 F): Frost days (min2219912
20 C (68 F): Tropical nights (min351120183
25 C (77 F): Days with min1120181
10 mm (0.39 in): Days with 10 mm or more rain3129201014
25 mm (0.98 in): Days with 25 mm or more rain29820221
50 mm (1.97 in): Days with 50 mm or more rain6220121
100 mm (3.94 in): Days with 100 mm or more rain1120051

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1991.

Download the Data

  • Data for Rhyll 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).