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Built 2026-10-19 (19 October 2026)

Philadelphia/Mt Holly WFO Threshold Days by Year (USC00286964)

16 fixed thresholds counted per year at Philadelphia/Mt Holly WFO (USC00286964): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Philadelphia/Mt Holly WFO Thresholds

  • Philadelphia/Mt Holly WFO: days with a maximum temperature at or above 30 C (86 F) in 33 years, most in 2010 with 71.
  • Philadelphia/Mt Holly WFO: days with a maximum temperature at or above 90 F (32.2 C) in 33 years, most in 1999 with 40.
  • Philadelphia/Mt Holly WFO: days with a maximum temperature at or below 0 C (32 F) in 33 years, most in 2015 with 33.
  • Philadelphia/Mt Holly WFO: nights with a minimum temperature at or below 0 C (32 F) in 33 years, most in 1996 with 125.
  • 16 fixed thresholds have at least one qualifying day at Philadelphia/Mt Holly WFO.
33 years with a qualifying day
Days at or above 30 C (86 F) per year at Philadelphia/Mt Holly WFO Days per year at Philadelphia/Mt Holly WFO with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 71 in 2010. 0204060801994: 431995: 531996: 381997: 421998: 611999: 572000: 332001: 472002: 642003: 342004: 402005: 652006: 572007: 612008: 562009: 342010: 712011: 542012: 582013: 442014: 272015: 452016: 582017: 342018: 552019: 602020: 562021: 552022: 622023: 552024: 632025: 522026: 55199419982002200620102014201820222026
Days per year at Philadelphia/Mt Holly WFO with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 71 in 2010.
Days at or above 30 C (86 F) per year at Philadelphia/Mt Holly WFO
YearDaysDecade average
19944349
19955349
19963849
19974249
19986149
19995749
20003349.1
20014749.1
20026449.1
20033449.1
20044049.1
20056549.1
20065749.1
20076149.1
20085649.1
20093449.1
20107150.6
20115450.6
20125850.6
20134450.6
20142750.6
20154550.6
20165850.6
20173450.6
20185550.6
20196050.6
20205656.9
20215556.9
20226256.9
20235556.9
20246356.9
20255256.9
20265556.9
First to last qualifying date each year at Philadelphia/Mt Holly WFO For each year, a bar from the first to the last day at Philadelphia/Mt Holly WFO meeting 30 C (86 F). 1994: 16 April 1994 to 15 August 19941995: 25 May 1995 to 15 September 19951996: 23 April 1996 to 10 September 19961997: 20 May 1997 to 7 October 19971998: 31 March 1998 to 28 September 19981999: 23 May 1999 to 10 September 19992000: 6 May 2000 to 4 September 20002001: 23 April 2001 to 11 September 20012002: 17 April 2002 to 22 September 20022003: 17 April 2003 to 31 August 20032004: 20 April 2004 to 31 August 20042005: 20 April 2005 to 24 September 20052006: 29 May 2006 to 26 August 20062007: 24 April 2007 to 9 October 20072008: 19 April 2008 to 15 September 20082009: 26 April 2009 to 27 August 20092010: 7 April 2010 to 25 September 20102011: 12 April 2011 to 15 September 20112012: 17 April 2012 to 9 September 20122013: 11 April 2013 to 13 September 20132014: 13 May 2014 to 7 September 20142015: 27 May 2015 to 10 September 20152016: 27 May 2016 to 15 September 20162017: 17 April 2017 to 26 September 20172018: 3 May 2018 to 7 September 20182019: 21 May 2019 to 3 October 20192020: 30 May 2020 to 9 September 20202021: 29 April 2021 to 16 September 20212022: 21 May 2022 to 20 September 20222023: 14 April 2023 to 13 September 20232024: 30 April 2024 to 29 August 20242025: 3 May 2025 to 20 September 20252026: 15 April 2026 to 3 October 20261994199920042009201420192024JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Philadelphia/Mt Holly WFO meeting 30 C (86 F).
First to last qualifying date each year at Philadelphia/Mt Holly WFO
YearFirst dateLast date
19941994-04-161994-08-15
19951995-05-251995-09-15
19961996-04-231996-09-10
19971997-05-201997-10-07
19981998-03-311998-09-28
19991999-05-231999-09-10
20002000-05-062000-09-04
20012001-04-232001-09-11
20022002-04-172002-09-22
20032003-04-172003-08-31
20042004-04-202004-08-31
20052005-04-202005-09-24
20062006-05-292006-08-26
20072007-04-242007-10-09
20082008-04-192008-09-15
20092009-04-262009-08-27
20102010-04-072010-09-25
20112011-04-122011-09-15
20122012-04-172012-09-09
20132013-04-112013-09-13
20142014-05-132014-09-07
20152015-05-272015-09-10
20162016-05-272016-09-15
20172017-04-172017-09-26
20182018-05-032018-09-07
20192019-05-212019-10-03
20202020-05-302020-09-09
20212021-04-292021-09-16
20222022-05-212022-09-20
20232023-04-142023-09-13
20242024-04-302024-08-29
20252025-05-032025-09-20
20262026-04-152026-10-03

Every Fixed Threshold

Fixed thresholds at Philadelphia/Mt Holly WFO
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3371201055
35 C (95 F): Days2819200210
90 F (32.2 C): Days3340199926
100 F (37.8 C): Days10419993
0 C (32 F): Ice days (max3333201522
0 C (32 F): Frost days (min33125199671
-10 C (14 F): Days with min3330201522
-20 C (-4 F): Days with min1219942
20 C (68 F): Tropical nights (min3352202143
25 C (77 F): Days with min10319991
10 mm (0.39 in): Days with 10 mm or more rain3357201834
25 mm (0.98 in): Days with 25 mm or more rain3320199613
50 mm (1.97 in): Days with 50 mm or more rain28619992
100 mm (3.94 in): Days with 100 mm or more rain7120041
10 cm (3.9 in): Days with 10 cm or more snowfall25620102
25 cm (9.8 in): Days with 25 cm or more snowfall10219961

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1994.

Download the Data

  • Data for Philadelphia/Mt Holly WFO 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).