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Built 2026-10-19 (19 October 2026)

Plymouth Threshold Days by Year (USC00126989)

18 fixed thresholds counted per year at Plymouth (USC00126989): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Plymouth Thresholds

  • Plymouth: days with a maximum temperature at or above 30 C (86 F) in 37 years, most in 2012 with 66.
  • Plymouth: days with a maximum temperature at or above 90 F (32.2 C) in 37 years, most in 2012 with 41.
  • Plymouth: days with a maximum temperature at or below 0 C (32 F) in 37 years, most in 2014 with 78.
  • Plymouth: nights with a minimum temperature at or below 0 C (32 F) in 37 years, most in 1997 with 154.
  • 18 fixed thresholds have at least one qualifying day at Plymouth.
37 years with a qualifying day
Days at or above 30 C (86 F) per year at Plymouth Days per year at Plymouth with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 66 in 2012. 0204060801990: 281991: 581992: 131993: 241994: 351995: 541996: 281997: 211998: 401999: 452000: 222001: 312002: 472003: 202004: 152005: 542006: 242007: 492008: 272009: 172010: 502011: 502012: 662013: 322014: 202015: 242016: 502017: 312018: 542019: 392020: 472021: 502022: 292023: 292024: 452025: 502026: 361990199419982002200620102014201820222026
Days per year at Plymouth with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 66 in 2012.
Days at or above 30 C (86 F) per year at Plymouth
YearDaysDecade average
19902834.6
19915834.6
19921334.6
19932434.6
19943534.6
19955434.6
19962834.6
19972134.6
19984034.6
19994534.6
20002230.6
20013130.6
20024730.6
20032030.6
20041530.6
20055430.6
20062430.6
20074930.6
20082730.6
20091730.6
20105041.6
20115041.6
20126641.6
20133241.6
20142041.6
20152441.6
20165041.6
20173141.6
20185441.6
20193941.6
20204740.9
20215040.9
20222940.9
20232940.9
20244540.9
20255040.9
20263640.9
First to last qualifying date each year at Plymouth For each year, a bar from the first to the last day at Plymouth meeting 30 C (86 F). 1990: 25 April 1990 to 7 September 19901991: 11 May 1991 to 16 September 19911992: 1 May 1992 to 26 August 19921993: 10 May 1993 to 31 August 19931994: 27 April 1994 to 17 September 19941995: 7 June 1995 to 7 September 19951996: 19 May 1996 to 23 August 19961997: 20 June 1997 to 6 October 19971998: 15 May 1998 to 27 September 19981999: 30 May 1999 to 28 September 19992000: 7 May 2000 to 20 September 20002001: 16 May 2001 to 8 September 20012002: 16 April 2002 to 15 September 20022003: 19 June 2003 to 29 August 20032004: 19 April 2004 to 28 August 20042005: 6 June 2005 to 23 September 20052006: 29 May 2006 to 5 August 20062007: 15 May 2007 to 9 October 20072008: 3 June 2008 to 3 September 20082009: 22 May 2009 to 17 August 20092010: 24 May 2010 to 10 October 20102011: 11 May 2011 to 13 September 20112012: 22 March 2012 to 5 September 20122013: 15 May 2013 to 12 September 20132014: 8 May 2014 to 6 September 20142015: 8 May 2015 to 9 September 20152016: 25 May 2016 to 23 September 20162017: 17 May 2017 to 27 September 20172018: 2 May 2018 to 9 October 20182019: 19 May 2019 to 2 October 20192020: 25 May 2020 to 4 September 20202021: 21 May 2021 to 28 September 20212022: 11 May 2022 to 22 September 20222023: 31 May 2023 to 4 October 20232024: 20 May 2024 to 22 September 20242025: 16 May 2025 to 4 October 20252026: 18 May 2026 to 16 September 202619901995200020052010201520202025JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Plymouth meeting 30 C (86 F).
First to last qualifying date each year at Plymouth
YearFirst dateLast date
19901990-04-251990-09-07
19911991-05-111991-09-16
19921992-05-011992-08-26
19931993-05-101993-08-31
19941994-04-271994-09-17
19951995-06-071995-09-07
19961996-05-191996-08-23
19971997-06-201997-10-06
19981998-05-151998-09-27
19991999-05-301999-09-28
20002000-05-072000-09-20
20012001-05-162001-09-08
20022002-04-162002-09-15
20032003-06-192003-08-29
20042004-04-192004-08-28
20052005-06-062005-09-23
20062006-05-292006-08-05
20072007-05-152007-10-09
20082008-06-032008-09-03
20092009-05-222009-08-17
20102010-05-242010-10-10
20112011-05-112011-09-13
20122012-03-222012-09-05
20132013-05-152013-09-12
20142014-05-082014-09-06
20152015-05-082015-09-09
20162016-05-252016-09-23
20172017-05-172017-09-27
20182018-05-022018-10-09
20192019-05-192019-10-02
20202020-05-252020-09-04
20212021-05-212021-09-28
20222022-05-112022-09-22
20232023-05-312023-10-04
20242024-05-202024-09-22
20252025-05-162025-10-04
20262026-05-182026-09-16

Every Fixed Threshold

Fixed thresholds at Plymouth
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3766201236
35 C (95 F): Days201420125
40 C (104 F): Days1220122
90 F (32.2 C): Days3741201213
100 F (37.8 C): Days3620126
0 C (32 F): Ice days (max3778201432
0 C (32 F): Frost days (min37154199779
-10 C (14 F): Days with min3767201419
-20 C (-4 F): Days with min281720144
-30 C (-22 F): Days with min1219942
20 C (68 F): Tropical nights (min3736199527
25 C (77 F): Days with min6219951
10 mm (0.39 in): Days with 10 mm or more rain3748199035
25 mm (0.98 in): Days with 25 mm or more rain3715199011
50 mm (1.97 in): Days with 50 mm or more rain32520153
100 mm (3.94 in): Days with 100 mm or more rain5119901
10 cm (3.9 in): Days with 10 cm or more snowfall35820142
25 cm (9.8 in): Days with 25 cm or more snowfall6220081

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1990.

Download the Data

  • Data for Plymouth 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).