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Built 2026-10-18 (18 October 2026)

Chelsea Threshold Days by Year

17 fixed thresholds counted per year at Chelsea (USC00201502): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Chelsea Thresholds

  • Chelsea: days with 10 mm (0.39 in) or more of precipitation in 39 years, most in 2011 with 40.
  • Chelsea: days with 25 mm (0.98 in) or more of precipitation in 39 years, most in 1990 with 12.
  • Chelsea: days with 10 cm (3.9 in) or more of snowfall in 31 years, most in 2008 with 6.
  • Chelsea: nights with a minimum temperature at or below 0 C (32 F) in 24 years, most in 2018 with 159.
  • 17 fixed thresholds have at least one qualifying day at Chelsea.
22 years with a qualifying day
Days at or above 30 C (86 F) per year at Chelsea Days per year at Chelsea with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 46 in 2012. 02040602005: 412006: 142007: 362008: 212009: 72010: 332011: 392012: 462013: 192014: 92015: 222016: 362017: 282018: 422019: 242020: 392021: 372022: 312023: 272024: 302025: 392026: 3220052008201120142017202020232026
Days per year at Chelsea with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 46 in 2012.
Days at or above 30 C (86 F) per year at Chelsea
YearDaysDecade average
20054123.8
20061423.8
20073623.8
20082123.8
2009723.8
20103329.8
20113929.8
20124629.8
20131929.8
2014929.8
20152229.8
20163629.8
20172829.8
20184229.8
20192429.8
20203933.6
20213733.6
20223133.6
20232733.6
20243033.6
20253933.6
20263233.6
First to last qualifying date each year at Chelsea For each year, a bar from the first to the last day at Chelsea meeting 30 C (86 F). 2005: 5 June 2005 to 14 September 20052006: 28 May 2006 to 2 August 20062007: 23 May 2007 to 9 October 20072008: 6 June 2008 to 4 September 20082009: 24 June 2009 to 17 August 20092010: 27 May 2010 to 24 September 20102011: 31 May 2011 to 4 September 20112012: 23 March 2012 to 7 September 20122013: 20 May 2013 to 12 September 20132014: 2 June 2014 to 6 September 20142015: 11 June 2015 to 9 September 20152016: 29 May 2016 to 8 September 20162017: 17 May 2017 to 27 September 20172018: 26 May 2018 to 10 October 20182019: 27 June 2019 to 2 October 20192020: 25 May 2020 to 28 August 20202021: 21 May 2021 to 15 September 20212022: 13 May 2022 to 4 September 20222023: 30 May 2023 to 4 October 20232024: 20 May 2024 to 23 September 20242025: 4 June 2025 to 5 October 20252026: 18 May 2026 to 2 September 202620052008201120142017202020232026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Chelsea meeting 30 C (86 F).
First to last qualifying date each year at Chelsea
YearFirst dateLast date
20052005-06-052005-09-14
20062006-05-282006-08-02
20072007-05-232007-10-09
20082008-06-062008-09-04
20092009-06-242009-08-17
20102010-05-272010-09-24
20112011-05-312011-09-04
20122012-03-232012-09-07
20132013-05-202013-09-12
20142014-06-022014-09-06
20152015-06-112015-09-09
20162016-05-292016-09-08
20172017-05-172017-09-27
20182018-05-262018-10-10
20192019-06-272019-10-02
20202020-05-252020-08-28
20212021-05-212021-09-15
20222022-05-132022-09-04
20232023-05-302023-10-04
20242024-05-202024-09-23
20252025-06-042025-10-05
20262026-05-182026-09-02

Every Fixed Threshold

Fixed thresholds at Chelsea
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2246201232
35 C (95 F): Days61020122
90 F (32.2 C): Days2228201211
100 F (37.8 C): Days1220122
0 C (32 F): Ice days (max2273201435
0 C (32 F): Frost days (min24159201877
-10 C (14 F): Days with min2458201432
-20 C (-4 F): Days with min201820145
-30 C (-22 F): Days with min1120151
20 C (68 F): Tropical nights (min2421201116
25 C (77 F): Days with min4120061
10 mm (0.39 in): Days with 10 mm or more rain3940201125
25 mm (0.98 in): Days with 25 mm or more rain391219905
50 mm (1.97 in): Days with 50 mm or more rain21420111
100 mm (3.94 in): Days with 100 mm or more rain1120111
10 cm (3.9 in): Days with 10 cm or more snowfall31620082
25 cm (9.8 in): Days with 25 cm or more snowfall3119991

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 2005.

Download the Data

  • Data for Chelsea 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).