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Built 2026-10-19 (19 October 2026)

Wales Threshold Days by Year (USC00308910)

16 fixed thresholds counted per year at Wales (USC00308910): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Wales Thresholds

  • Wales: days with 10 mm (0.39 in) or more of precipitation in 41 years, most in 2017 with 54.
  • Wales: days with 25 mm (0.98 in) or more of precipitation in 41 years, most in 2017 with 13.
  • Wales: days with a maximum temperature at or below 0 C (32 F) in 40 years, most in 2010 with 72.
  • Wales: nights with a minimum temperature at or below 0 C (32 F) in 40 years, most in 1997 with 173.
  • 16 fixed thresholds have at least one qualifying day at Wales.
37 years with a qualifying day
Days at or above 30 C (86 F) per year at Wales Days per year at Wales with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 24 in 2025. 01020301986: 21987: 61988: 161990: 51991: 121993: 91994: 71995: 141996: 21997: 21998: 21999: 132000: 12001: 152002: 152003: 22005: 152006: 82007: 142008: 42010: 102011: 122012: 132013: 82014: 72015: 132016: 232017: 52018: 212019: 82020: 202021: 202022: 142023: 92024: 152025: 242026: 131986199119962000200520102014201820222026
Days per year at Wales with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 24 in 2025.
Days at or above 30 C (86 F) per year at Wales
YearDaysDecade average
198628
198768
1988168
199057.3
1991127.3
199397.3
199477.3
1995147.3
199627.3
199727.3
199827.3
1999137.3
200019.3
2001159.3
2002159.3
200329.3
2005159.3
200689.3
2007149.3
200849.3
20101012
20111212
20121312
2013812
2014712
20151312
20162312
2017512
20182112
2019812
20202016.4
20212016.4
20221416.4
2023916.4
20241516.4
20252416.4
20261316.4
First to last qualifying date each year at Wales For each year, a bar from the first to the last day at Wales meeting 30 C (86 F). 1986: 8 July 1986 to 26 July 19861987: 31 May 1987 to 18 August 19871988: 15 June 1988 to 30 July 19881990: 29 April 1990 to 31 July 19901991: 16 June 1991 to 17 September 19911993: 26 June 1993 to 1 September 19931994: 16 June 1994 to 22 July 19941995: 20 June 1995 to 1 September 19951996: 20 May 1996 to 8 August 19961997: 15 July 1997 to 16 July 19971998: 17 May 1998 to 26 June 19981999: 11 June 1999 to 1 August 19992000: 15 June 2000 to 15 June 20002001: 15 June 2001 to 10 September 20012002: 3 July 2002 to 10 September 20022003: 26 June 2003 to 27 June 20032005: 9 June 2005 to 11 August 20052006: 30 May 2006 to 3 August 20062007: 9 June 2007 to 26 September 20072008: 7 June 2008 to 9 July 20082010: 6 July 2010 to 25 September 20102011: 1 June 2011 to 4 September 20112012: 29 May 2012 to 1 September 20122013: 15 July 2013 to 12 September 20132014: 14 May 2014 to 7 September 20142015: 10 May 2015 to 9 September 20152016: 29 May 2016 to 11 September 20162017: 18 June 2017 to 27 September 20172018: 31 May 2018 to 22 September 20182019: 25 June 2019 to 21 August 20192020: 23 May 2020 to 25 August 20202021: 21 May 2021 to 30 August 20212022: 2 June 2022 to 30 August 20222023: 2 June 2023 to 7 September 20232024: 21 May 2024 to 31 August 20242025: 5 June 2025 to 17 August 20252026: 19 May 2026 to 16 August 202619861993199820032010201520202025JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Wales meeting 30 C (86 F).
First to last qualifying date each year at Wales
YearFirst dateLast date
19861986-07-081986-07-26
19871987-05-311987-08-18
19881988-06-151988-07-30
19901990-04-291990-07-31
19911991-06-161991-09-17
19931993-06-261993-09-01
19941994-06-161994-07-22
19951995-06-201995-09-01
19961996-05-201996-08-08
19971997-07-151997-07-16
19981998-05-171998-06-26
19991999-06-111999-08-01
20002000-06-152000-06-15
20012001-06-152001-09-10
20022002-07-032002-09-10
20032003-06-262003-06-27
20052005-06-092005-08-11
20062006-05-302006-08-03
20072007-06-092007-09-26
20082008-06-072008-07-09
20102010-07-062010-09-25
20112011-06-012011-09-04
20122012-05-292012-09-01
20132013-07-152013-09-12
20142014-05-142014-09-07
20152015-05-102015-09-09
20162016-05-292016-09-11
20172017-06-182017-09-27
20182018-05-312018-09-22
20192019-06-252019-08-21
20202020-05-232020-08-25
20212021-05-212021-08-30
20222022-06-022022-08-30
20232023-06-022023-09-07
20242024-05-212024-08-31
20252025-06-052025-08-17
20262026-05-192026-08-16

Every Fixed Threshold

Fixed thresholds at Wales
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3724202513
35 C (95 F): Days3119881
90 F (32.2 C): Days20719884
0 C (32 F): Ice days (max4072201042
0 C (32 F): Frost days (min40173199795
-10 C (14 F): Days with min4062201535
-20 C (-4 F): Days with min371620148
20 C (68 F): Tropical nights (min381720218
25 C (77 F): Days with min2119991
10 mm (0.39 in): Days with 10 mm or more rain4154201735
25 mm (0.98 in): Days with 25 mm or more rain411320176
50 mm (1.97 in): Days with 50 mm or more rain16220051
100 mm (3.94 in): Days with 100 mm or more rain1120051
10 cm (3.9 in): Days with 10 cm or more snowfall391720248
25 cm (9.8 in): Days with 25 cm or more snowfall24520243
50 cm (19.7 in): Days with 50 cm or more snowfall3120141

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1986.

Download the Data

  • Data for Wales 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).