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Built 2026-10-16 (16 October 2026)

Trenton-Mercer AP Threshold Days by Year

16 fixed thresholds counted per year at Trenton-Mercer AP (USW00014792): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Trenton-Mercer AP Thresholds

  • Trenton-Mercer AP: days with a maximum temperature at or above 30 C (86 F) in 27 years, most in 2010 with 77.
  • Trenton-Mercer AP: days with a maximum temperature at or above 90 F (32.2 C) in 27 years, most in 2010 with 52.
  • Trenton-Mercer AP: days with a maximum temperature at or below 0 C (32 F) in 27 years, most in 2003 with 33.
  • Trenton-Mercer AP: nights with a minimum temperature at or below 0 C (32 F) in 27 years, most in 2003 with 116.
  • 16 fixed thresholds have at least one qualifying day at Trenton-Mercer AP.
27 years with a qualifying day
Days at or above 30 C (86 F) per year at Trenton-Mercer AP Days per year at Trenton-Mercer AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 77 in 2010. 0204060801999: 512000: 272001: 362002: 572003: 302004: 342005: 562006: 472007: 532008: 472009: 292010: 772011: 632012: 492013: 402014: 302015: 592016: 702017: 462018: 622019: 492020: 532021: 462022: 562023: 382024: 472025: 47199920022005200820112014201720202023
Days per year at Trenton-Mercer AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 77 in 2010.
Days at or above 30 C (86 F) per year at Trenton-Mercer AP
YearDaysDecade average
19995151
20002741.6
20013641.6
20025741.6
20033041.6
20043441.6
20055641.6
20064741.6
20075341.6
20084741.6
20092941.6
20107754.5
20116354.5
20124954.5
20134054.5
20143054.5
20155954.5
20167054.5
20174654.5
20186254.5
20194954.5
20205347.8
20214647.8
20225647.8
20233847.8
20244747.8
20254747.8
First to last qualifying date each year at Trenton-Mercer AP For each year, a bar from the first to the last day at Trenton-Mercer AP meeting 30 C (86 F). 1999: 29 May 1999 to 29 August 19992000: 5 May 2000 to 1 September 20002001: 23 April 2001 to 10 September 20012002: 16 April 2002 to 10 September 20022003: 23 June 2003 to 30 August 20032004: 19 April 2004 to 29 August 20042005: 5 June 2005 to 23 September 20052006: 29 May 2006 to 23 August 20062007: 25 May 2007 to 8 October 20072008: 7 June 2008 to 14 September 20082009: 25 April 2009 to 26 August 20092010: 6 April 2010 to 25 September 20102011: 11 April 2011 to 9 October 20112012: 16 April 2012 to 8 September 20122013: 10 April 2013 to 4 October 20132014: 3 June 2014 to 6 September 20142015: 25 May 2015 to 17 September 20152016: 25 May 2016 to 19 October 20162017: 16 April 2017 to 27 September 20172018: 2 May 2018 to 16 September 20182019: 20 May 2019 to 2 October 20192020: 4 June 2020 to 4 September 20202021: 19 May 2021 to 15 September 20212022: 21 May 2022 to 5 September 20222023: 1 June 2023 to 8 September 20232024: 29 April 2024 to 28 August 20242025: 5 June 2025 to 6 September 20251999200320072011201520192023JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Trenton-Mercer AP meeting 30 C (86 F).
First to last qualifying date each year at Trenton-Mercer AP
YearFirst dateLast date
19991999-05-291999-08-29
20002000-05-052000-09-01
20012001-04-232001-09-10
20022002-04-162002-09-10
20032003-06-232003-08-30
20042004-04-192004-08-29
20052005-06-052005-09-23
20062006-05-292006-08-23
20072007-05-252007-10-08
20082008-06-072008-09-14
20092009-04-252009-08-26
20102010-04-062010-09-25
20112011-04-112011-10-09
20122012-04-162012-09-08
20132013-04-102013-10-04
20142014-06-032014-09-06
20152015-05-252015-09-17
20162016-05-252016-10-19
20172017-04-162017-09-27
20182018-05-022018-09-16
20192019-05-202019-10-02
20202020-06-042020-09-04
20212021-05-192021-09-15
20222022-05-212022-09-05
20232023-06-012023-09-08
20242024-04-292024-08-28
20252025-06-052025-09-06

Every Fixed Threshold

Fixed thresholds at Trenton-Mercer AP
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2777201047
35 C (95 F): Days201820026
40 C (104 F): Days2220112
90 F (32.2 C): Days2752201019
100 F (37.8 C): Days5320102
0 C (32 F): Ice days (max2733200327
0 C (32 F): Frost days (min271162003106
-10 C (14 F): Days with min262320157
20 C (68 F): Tropical nights (min2759201835
25 C (77 F): Days with min15520102
10 mm (0.39 in): Days with 10 mm or more rain2757201834
25 mm (0.98 in): Days with 25 mm or more rain271820186
50 mm (1.97 in): Days with 50 mm or more rain24520111
100 mm (3.94 in): Days with 100 mm or more rain8119991
10 cm (3.9 in): Days with 10 cm or more snowfall22520031
25 cm (9.8 in): Days with 25 cm or more snowfall5120001

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1999.

Download the Data

  • Data for Trenton-Mercer AP 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 2026-10-14 (14 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).