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Philadelphia/Mt Holly WFO Weather Records (USC00286964)

Record envelope, standing records and threshold days for Philadelphia/Mt Holly WFO (USC00286964), New Jersey, United States, with 34 years of record.

Key Facts for Philadelphia/Mt Holly WFO

  • Philadelphia/Mt Holly WFO (USC00286964) is a weather station in New Jersey, United States at 40.01 latitude and -74.82 longitude, 18 m (58 ft) above sea level.
  • The station reports from 1993 to 2026, 34 years of record.
  • 1,464 records set at Philadelphia/Mt Holly WFO still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Philadelphia/Mt Holly WFO set a daily record precipitation of 70.9 mm (2.8 in) on 12 October 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

  • Location: New Jersey, United States, 40.01 latitude, -74.82 longitude.
  • Elevation: 18 m (58 ft).
  • Period of record: 1993 to 2026, 34 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

30 days at or beyond a record
Daily record high and record low at Philadelphia/Mt Holly WFO, with 2026 drawn through them The band shows the record high and record low for each calendar day at Philadelphia/Mt Holly WFO. The lines show the 2026 daily maximum and minimum. 30 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -40-2002040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Philadelphia/Mt Holly WFO. The lines show the 2026 daily maximum and minimum. 30 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Philadelphia/Mt Holly WFO, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan22.2 C (72.0 F)-21.1 C (-6.0 F)14.4 C (57.9 F)-18.3 C (-0.9 F)
Feb25.0 C (77.0 F)-19.4 C (-2.9 F)10.0 C (50.0 F)-18.3 C (-0.9 F)
Mar32.2 C (90.0 F)-16.1 C (3.0 F)27.8 C (82.0 F)-5.6 C (21.9 F)
Apr35.6 C (96.1 F)-5.0 C (23.0 F)33.3 C (91.9 F)-3.3 C (26.1 F)
May36.7 C (98.1 F)0.0 C (32.0 F)36.1 C (97.0 F)4.4 C (39.9 F)
Jun37.8 C (100.0 F)6.1 C (43.0 F)35.0 C (95.0 F)7.2 C (45.0 F)
Jul39.4 C (102.9 F)10.0 C (50.0 F)39.4 C (102.9 F)13.3 C (55.9 F)
Aug38.9 C (102.0 F)8.9 C (48.0 F)34.4 C (93.9 F)13.3 C (55.9 F)
Sep36.1 C (97.0 F)2.8 C (37.0 F)32.2 C (90.0 F)10.6 C (51.1 F)
Oct34.4 C (93.9 F)-3.3 C (26.1 F)30.0 C (86.0 F)3.9 C (39.0 F)
Nov28.3 C (82.9 F)-10.0 C (14.0 F)n/an/a
Dec22.8 C (73.0 F)-16.7 C (1.9 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Philadelphia/Mt Holly WFO by the year they were set 1,464 records at Philadelphia/Mt Holly WFO still stand. 2002 holds the most, with 65. 0204060801993: 151994: 521995: 571996: 641997: 521998: 441999: 522000: 602001: 532002: 652003: 362004: 452005: 412006: 412007: 362008: 262009: 402010: 442011: 372012: 422013: 432014: 402015: 602016: 322017: 532018: 582019: 322020: 342021: 332022: 302023: 382024: 432025: 312026: 35199319972001200520092013201720212025
1,464 records at Philadelphia/Mt Holly WFO still stand. 2002 holds the most, with 65.
Standing records at Philadelphia/Mt Holly WFO by the year they were set
Year setStanding records
199315
199452
199557
199664
199752
199844
199952
200060
200153
200265
200336
200445
200541
200641
200736
200826
200940
201044
201137
201242
201343
201440
201560
201632
201753
201858
201932
202034
202133
202230
202338
202443
202531
202635

Wettest Day of Each Month

Jul: 158.8 mm (6.3 in)
Record daily precipitation for each month at Philadelphia/Mt Holly WFO The wettest day on record for each calendar month at Philadelphia/Mt Holly WFO. The most was 158.8 mm (6.3 in) on 23 July 2013. 050100150200 Jan: 59.7 mm (2.4 in), 10 January 2024 Jan Feb: 52.8 mm (2.1 in), 23 February 2003 Feb Mar: 68.6 mm (2.7 in), 24 March 2024 Mar Apr: 123.7 mm (4.9 in), 16 April 2007 Apr May: 108.0 mm (4.3 in), 1 May 2014 May Jun: 126.5 mm (5.0 in), 11 June 2018 Jun Jul: 158.8 mm (6.3 in), 23 July 2013 Jul Aug: 148.1 mm (5.8 in), 28 August 2011 Aug Sep: 99.1 mm (3.9 in), 17 September 1999 Sep Oct: 92.5 mm (3.6 in), 30 October 2017 Oct Nov: 73.9 mm (2.9 in), 25 November 2018 Nov Dec: 71.9 mm (2.8 in), 12 December 2008 Dec
The wettest day on record for each calendar month at Philadelphia/Mt Holly WFO. The most was 158.8 mm (6.3 in) on 23 July 2013.
Record daily precipitation for each month at Philadelphia/Mt Holly WFO
MonthRecord daily precipitation (mm)Date
Jan59.7 mm (2.4 in)10 January 2024
Feb52.8 mm (2.1 in)23 February 2003
Mar68.6 mm (2.7 in)24 March 2024
Apr123.7 mm (4.9 in)16 April 2007
May108.0 mm (4.3 in)1 May 2014
Jun126.5 mm (5.0 in)11 June 2018
Jul158.8 mm (6.3 in)23 July 2013
Aug148.1 mm (5.8 in)28 August 2011
Sep99.1 mm (3.9 in)17 September 1999
Oct92.5 mm (3.6 in)30 October 2017
Nov73.9 mm (2.9 in)25 November 2018
Dec71.9 mm (2.8 in)12 December 2008

Period of Record Coverage

1993 to 2026
Days with data per year at Philadelphia/Mt Holly WFO 34 years of record at Philadelphia/Mt Holly WFO, 1993 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 1993, 2026. 1993: 85 of 365 days1994: 364 of 365 days1995: 362 of 365 days1996: 366 of 366 days1997: 365 of 365 days1998: 365 of 365 days1999: 365 of 365 days2000: 366 of 366 days2001: 365 of 365 days2002: 365 of 365 days2003: 365 of 365 days2004: 366 of 366 days2005: 365 of 365 days2006: 365 of 365 days2007: 365 of 365 days2008: 364 of 366 days2009: 365 of 365 days2010: 364 of 365 days2011: 365 of 365 days2012: 366 of 366 days2013: 364 of 365 days2014: 365 of 365 days2015: 365 of 365 days2016: 366 of 366 days2017: 365 of 365 days2018: 365 of 365 days2019: 365 of 365 days2020: 366 of 366 days2021: 365 of 365 days2022: 365 of 365 days2023: 365 of 365 days2024: 366 of 366 days2025: 365 of 365 days2026: 284 of 365 days1995200020052010201520202025
34 years of record at Philadelphia/Mt Holly WFO, 1993 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 1993, 2026.
Days with data per year at Philadelphia/Mt Holly WFO
YearDays with dataShare of yearComplete
19938523%No
1994364100%Yes
199536299%Yes
1996366100%Yes
1997365100%Yes
1998365100%Yes
1999365100%Yes
2000366100%Yes
2001365100%Yes
2002365100%Yes
2003365100%Yes
2004366100%Yes
2005365100%Yes
2006365100%Yes
2007365100%Yes
200836499%Yes
2009365100%Yes
2010364100%Yes
2011365100%Yes
2012366100%Yes
2013364100%Yes
2014365100%Yes
2015365100%Yes
2016366100%Yes
2017365100%Yes
2018365100%Yes
2019365100%Yes
2020366100%Yes
2021365100%Yes
2022365100%Yes
2023365100%Yes
2024366100%Yes
2025365100%Yes
202628478%No

Latest Records

20
Latest records at Philadelphia/Mt Holly WFO
DateStationRecordValueBeat old record byOld record stoodSignificance
12 October 2026Philadelphia/Mt Holly WFO, USdaily rain (Provisional)70.9 mm (2.8 in)18.3 mm (0.7 in)20 years21 of 100 (Routine)
2 October 2026Philadelphia/Mt Holly WFO, USdaily high max (Tie, Provisional)27.8 C (82.0 F)tie7 years1 of 100 (Routine)
28 September 2026Philadelphia/Mt Holly WFO, USdaily rain (Provisional)37.8 mm (1.5 in)16.2 mm (0.6 in)8 years15 of 100 (Routine)
28 September 2026Philadelphia/Mt Holly WFO, USdaily low max (Provisional)17.8 C (64.0 F)1.1 C (2.0 F)25 years12 of 100 (Routine)
27 September 2026Philadelphia/Mt Holly WFO, USdaily rain (Provisional)59.7 mm (2.4 in)29.0 mm (1.1 in)24 years29 of 100 (Routine)
21 September 2026Philadelphia/Mt Holly WFO, USdaily rain (Provisional)30.7 mm (1.2 in)9.1 mm (0.36 in)32 years18 of 100 (Routine)
18 September 2026Philadelphia/Mt Holly WFO, USdaily high min (Provisional)20.0 C (68.0 F)0.6 C (1.1 F)21 years10 of 100 (Routine)
18 September 2026Philadelphia/Mt Holly WFO, USdaily high max (Tie, Provisional)29.4 C (84.9 F)tie20 years2 of 100 (Routine)
14 September 2026Philadelphia/Mt Holly WFO, USdaily rain (Provisional)19.8 mm (0.8 in)3.0 mm (0.12 in)23 years11 of 100 (Routine)
14 September 2026Philadelphia/Mt Holly WFO, USdaily high min (Provisional)20.6 C (69.1 F)0.6 C (1.1 F)23 years10 of 100 (Routine)
7 August 2026Philadelphia/Mt Holly WFO, USdaily high min (Tie)22.8 C (73.0 F)tie15 years1 of 100 (Routine)
7 August 2026Philadelphia/Mt Holly WFO, USdaily high max (Tie)33.9 C (93.0 F)tie1 year0 of 100 (Routine)
4 August 2026Philadelphia/Mt Holly WFO, USdaily rain48.3 mm (1.9 in)18.8 mm (0.7 in)15 years17 of 100 (Routine)
26 July 2026Philadelphia/Mt Holly WFO, USdaily low min13.3 C (55.9 F)1.7 C (3.1 F)24 years15 of 100 (Routine)
17 July 2026Philadelphia/Mt Holly WFO, USdaily rain20.8 mm (0.8 in)4.0 mm (0.16 in)4 years6 of 100 (Routine)
10 July 2026Philadelphia/Mt Holly WFO, USdaily rain39.4 mm (1.6 in)2.6 mm (0.10 in)11 years7 of 100 (Routine)
8 July 2026Philadelphia/Mt Holly WFO, USdaily low max (Tie)23.9 C (75.0 F)tie31 years3 of 100 (Routine)
5 July 2026Philadelphia/Mt Holly WFO, USdaily high max37.8 C (100.0 F)1.1 C (2.0 F)24 years13 of 100 (Routine)
4 July 2026Philadelphia/Mt Holly WFO, USdaily high max38.9 C (102.0 F)1.7 C (3.1 F)8 years10 of 100 (Routine)
3 July 2026Philadelphia/Mt Holly WFO, USdaily high min25.6 C (78.1 F)2.3 C (4.1 F)24 years17 of 100 (Routine)

Climate Trend

32 complete years, 1994 to 2025
Annual mean temperature at Philadelphia/Mt Holly WFO as warming stripes, 1994 to 2025 One stripe for each of 32 complete years at Philadelphia/Mt Holly WFO, 1994 to 2025. Blue stripes are years cooler than the station's own mean of 12.2 C (54.0 F); red stripes are warmer. The coolest year was 2014, at 11.1 C (51.9 F), and the warmest was 2012, at 13.6 C (56.4 F). The strongest colour marks a difference of 1.4 C (2.5 F). 1994: 11.1 C, -1.1 C from the station mean1995: 11.3 C, -0.9 C from the station mean1996: 11.1 C, -1.2 C from the station mean1997: 11.5 C, -0.8 C from the station mean1998: 13.1 C, +0.9 C from the station mean1999: 12.5 C, +0.3 C from the station mean2000: 11.4 C, -0.8 C from the station mean2001: 12.2 C, -0.1 C from the station mean2002: 12.6 C, +0.3 C from the station mean2003: 11.1 C, -1.1 C from the station mean2004: 11.7 C, -0.5 C from the station mean2005: 12.0 C, -0.2 C from the station mean2006: 12.9 C, +0.6 C from the station mean2007: 12.1 C, -0.1 C from the station mean2008: 12.2 C, 0.0 C from the station mean2009: 11.6 C, -0.6 C from the station mean2010: 12.5 C, +0.2 C from the station mean2011: 12.9 C, +0.7 C from the station mean2012: 13.6 C, +1.3 C from the station mean2013: 12.2 C, 0.0 C from the station mean2014: 11.1 C, -1.2 C from the station mean2015: 11.9 C, -0.3 C from the station mean2016: 12.5 C, +0.2 C from the station mean2017: 12.4 C, +0.1 C from the station mean2018: 12.3 C, 0.0 C from the station mean2019: 12.5 C, +0.2 C from the station mean2020: 13.2 C, +0.9 C from the station mean2021: 13.0 C, +0.7 C from the station mean2022: 12.5 C, +0.3 C from the station mean2023: 13.2 C, +1.0 C from the station mean2024: 13.4 C, +1.1 C from the station mean2025: 12.2 C, 0.0 C from the station mean1994200020052010201520202025
One stripe for each of 32 complete years at Philadelphia/Mt Holly WFO, 1994 to 2025. Blue stripes are years cooler than the station's own mean of 12.2 C (54.0 F); red stripes are warmer. The coolest year was 2014, at 11.1 C (51.9 F), and the warmest was 2012, at 13.6 C (56.4 F). The strongest colour marks a difference of 1.4 C (2.5 F).
Annual mean temperature at Philadelphia/Mt Holly WFO as warming stripes, 1994 to 2025
YearAnnual mean temperatureDifference from the station mean
199411.1 C-1.12 C
199511.3 C-0.93 C
199611.1 C-1.17 C
199711.5 C-0.75 C
199813.1 C+0.87 C
199912.5 C+0.26 C
200011.4 C-0.80 C
200112.2 C-0.06 C
200212.6 C+0.34 C
200311.1 C-1.10 C
200411.7 C-0.53 C
200512.0 C-0.21 C
200612.9 C+0.63 C
200712.1 C-0.10 C
200812.2 C-0.01 C
200911.6 C-0.64 C
201012.5 C+0.24 C
201112.9 C+0.68 C
201213.6 C+1.32 C
201312.2 C-0.01 C
201411.1 C-1.19 C
201511.9 C-0.30 C
201612.5 C+0.25 C
201712.4 C+0.11 C
201812.3 C+0.04 C
201912.5 C+0.24 C
202013.2 C+0.95 C
202113.0 C+0.75 C
202212.5 C+0.26 C
202313.2 C+0.99 C
202413.4 C+1.13 C
202512.2 C-0.04 C

The annual mean temperature here has risen by 0.4 C (0.2 to 0.6) per decade over 1994 to 2025. In Fahrenheit: 0.7 F (0.3 to 1.2) per decade. The slope is a straight line fitted to 32 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Philadelphia/Mt Holly WFO
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.4 C (0.2 to 0.6) per decade0.7 F (0.3 to 1.2) per decade1994 to 202532Rise
Mean daily maximum0.33 C (0.05 to 0.62) per decade0.6 F (0.1 to 1.1) per decade1994 to 202532Rise
Mean daily minimum0.5 C (0.3 to 0.7) per decade0.9 F (0.5 to 1.3) per decade1994 to 202532Rise

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1993 to 2026
Yearly extremes at Philadelphia/Mt Holly WFO: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)39.4 C (102.9 F)201036.7 C (98.1 F)34
Coldest night (TNn)-21.1 C (-6.0 F)1994-15.3 C (4.5 F)34
Wettest day (Rx1day)158.8 mm (6.3 in)201368.9 mm (2.7 in)34
Wettest five days (Rx5day)183.3 mm (7.2 in)2005107.2 mm (4.2 in)34
Longest dry spell (CDD)42 days202417 days34

Hottest day (TXx)

Hottest day (TXx) at Philadelphia/Mt Holly WFO by year The hottest day of the year at Philadelphia/Mt Holly WFO, 1993 to 2026. The record is 39.4 C (102.9 F) in 2010, marked on the chart; the median year is 36.7 C (98.1 F). 2025303540200020102020Record: 39.4 C (102.9 F) in 2010
The hottest day of the year at Philadelphia/Mt Holly WFO, 1993 to 2026. The record is 39.4 C (102.9 F) in 2010, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Philadelphia/Mt Holly WFO by year
YearHottest day (TXx)
199324.4 C (75.9 F)
199436.7 C (98.1 F)
199537.8 C (100.0 F)
199636.7 C (98.1 F)
199737.2 C (99.0 F)
199834.4 C (93.9 F)
199938.3 C (100.9 F)
200035.0 C (95.0 F)
200138.9 C (102.0 F)
200237.8 C (100.0 F)
200335.6 C (96.1 F)
200433.3 C (91.9 F)
200536.1 C (97.0 F)
200637.8 C (100.0 F)
200736.7 C (98.1 F)
200836.7 C (98.1 F)
200935.0 C (95.0 F)
201039.4 C (102.9 F)
201137.8 C (100.0 F)
201238.3 C (100.9 F)
201336.7 C (98.1 F)
201433.9 C (93.0 F)
201533.9 C (93.0 F)
201636.1 C (97.0 F)
201734.4 C (93.9 F)
201837.2 C (99.0 F)
201936.7 C (98.1 F)
202035.0 C (95.0 F)
202136.1 C (97.0 F)
202236.7 C (98.1 F)
202336.1 C (97.0 F)
202436.7 C (98.1 F)
202537.8 C (100.0 F)
202639.4 C (102.9 F)

Coldest night (TNn)

Coldest night (TNn) at Philadelphia/Mt Holly WFO by year The coldest night of the year at Philadelphia/Mt Holly WFO, 1993 to 2026. The record is -21.1 C (-6.0 F) in 1994, marked on the chart; the median year is -15.3 C (4.5 F). -25-20-15-10200020102020Record: -21.1 C (-6.0 F) in 1994
The coldest night of the year at Philadelphia/Mt Holly WFO, 1993 to 2026. The record is -21.1 C (-6.0 F) in 1994, marked on the chart; the median year is -15.3 C (4.5 F).
Coldest night (TNn) at Philadelphia/Mt Holly WFO by year
YearColdest night (TNn)
1993-12.8 C (9.0 F)
1994-21.1 C (-6.0 F)
1995-16.1 C (3.0 F)
1996-19.4 C (-2.9 F)
1997-15.0 C (5.0 F)
1998-13.3 C (8.1 F)
1999-13.3 C (8.1 F)
2000-16.7 C (1.9 F)
2001-12.2 C (10.0 F)
2002-13.9 C (7.0 F)
2003-15.6 C (3.9 F)
2004-16.7 C (1.9 F)
2005-17.8 C (0.0 F)
2006-11.7 C (10.9 F)
2007-13.9 C (7.0 F)
2008-12.2 C (10.0 F)
2009-17.2 C (1.0 F)
2010-12.8 C (9.0 F)
2011-15.6 C (3.9 F)
2012-10.6 C (12.9 F)
2013-15.0 C (5.0 F)
2014-17.8 C (0.0 F)
2015-18.9 C (-2.0 F)
2016-15.0 C (5.0 F)
2017-15.6 C (3.9 F)
2018-17.8 C (0.0 F)
2019-15.6 C (3.9 F)
2020-11.7 C (10.9 F)
2021-11.7 C (10.9 F)
2022-15.6 C (3.9 F)
2023-13.3 C (8.1 F)
2024-15.0 C (5.0 F)
2025-18.3 C (-0.9 F)
2026-18.3 C (-0.9 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Philadelphia/Mt Holly WFO by year The wettest day of the year at Philadelphia/Mt Holly WFO, 1993 to 2026. The record is 158.8 mm (6.3 in) in 2013, marked on the chart; the median year is 68.9 mm (2.7 in). 050100150200200020102020Record: 158.8 mm (6.3 in) in 2013
The wettest day of the year at Philadelphia/Mt Holly WFO, 1993 to 2026. The record is 158.8 mm (6.3 in) in 2013, marked on the chart; the median year is 68.9 mm (2.7 in).
Wettest day (Rx1day) at Philadelphia/Mt Holly WFO by year
YearWettest day (Rx1day)
199350.0 mm (2.0 in)
199453.3 mm (2.1 in)
199542.4 mm (1.7 in)
199665.8 mm (2.6 in)
199758.7 mm (2.3 in)
199857.2 mm (2.3 in)
199999.1 mm (3.9 in)
200064.3 mm (2.5 in)
200144.5 mm (1.8 in)
200246.7 mm (1.8 in)
200352.8 mm (2.1 in)
2004103.1 mm (4.1 in)
200589.7 mm (3.5 in)
200646.2 mm (1.8 in)
2007123.7 mm (4.9 in)
200871.9 mm (2.8 in)
200949.0 mm (1.9 in)
201079.5 mm (3.1 in)
2011148.1 mm (5.8 in)
201251.8 mm (2.0 in)
2013158.8 mm (6.3 in)
2014108.0 mm (4.3 in)
201558.7 mm (2.3 in)
201678.2 mm (3.1 in)
201792.5 mm (3.6 in)
2018126.5 mm (5.0 in)
201969.3 mm (2.7 in)
202079.8 mm (3.1 in)
202166.0 mm (2.6 in)
202260.2 mm (2.4 in)
202370.1 mm (2.8 in)
202468.6 mm (2.7 in)
2025122.9 mm (4.8 in)
202670.9 mm (2.8 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Philadelphia/Mt Holly WFO by year The wettest five days of the year at Philadelphia/Mt Holly WFO, 1993 to 2026. The record is 183.3 mm (7.2 in) in 2005, marked on the chart; the median year is 107.2 mm (4.2 in). 50100150200200020102020Record: 183.3 mm (7.2 in) in 2005
The wettest five days of the year at Philadelphia/Mt Holly WFO, 1993 to 2026. The record is 183.3 mm (7.2 in) in 2005, marked on the chart; the median year is 107.2 mm (4.2 in).
Wettest five days (Rx5day) at Philadelphia/Mt Holly WFO by year
YearWettest five days (Rx5day)
199377.5 mm (3.1 in)
199490.7 mm (3.6 in)
199570.9 mm (2.8 in)
1996116.4 mm (4.6 in)
199788.9 mm (3.5 in)
199899.3 mm (3.9 in)
1999153.2 mm (6.0 in)
200092.9 mm (3.7 in)
200165.5 mm (2.6 in)
200283.8 mm (3.3 in)
2003101.1 mm (4.0 in)
2004116.3 mm (4.6 in)
2005183.3 mm (7.2 in)
200698.3 mm (3.9 in)
2007177.2 mm (7.0 in)
200883.3 mm (3.3 in)
200986.9 mm (3.4 in)
2010113.6 mm (4.5 in)
2011161.6 mm (6.4 in)
201277.5 mm (3.1 in)
2013179.1 mm (7.1 in)
2014132.3 mm (5.2 in)
2015110.5 mm (4.4 in)
201678.8 mm (3.1 in)
201792.5 mm (3.6 in)
2018126.5 mm (5.0 in)
2019123.1 mm (4.8 in)
2020107.5 mm (4.2 in)
202182.5 mm (3.2 in)
2022129.3 mm (5.1 in)
2023127.5 mm (5.0 in)
2024107.2 mm (4.2 in)
2025147.3 mm (5.8 in)
2026107.2 mm (4.2 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Philadelphia/Mt Holly WFO by year The longest dry spell of the year at Philadelphia/Mt Holly WFO, 1993 to 2026. The record is 42 days in 2024, marked on the chart; the median year is 17 days. 01020304050200020102020Record: 42 days in 2024
The longest dry spell of the year at Philadelphia/Mt Holly WFO, 1993 to 2026. The record is 42 days in 2024, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Philadelphia/Mt Holly WFO by year
YearLongest dry spell (CDD)
19939 days
199421 days
199532 days
199610 days
199716 days
199827 days
199921 days
200021 days
200135 days
200216 days
200316 days
200417 days
200517 days
200617 days
200719 days
200816 days
200916 days
201019 days
201116 days
201219 days
201315 days
201410 days
201523 days
201616 days
201717 days
201816 days
201911 days
202013 days
202117 days
202211 days
202322 days
202442 days
202514 days
202620 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Frost Dates and Growing Season

32 years with a frost

Across 32 years with a frost, the median last spring frost at Philadelphia/Mt Holly WFO falls on 16 April and the median first autumn frost on 31 October, which leaves a median of 201 days between them.

Fitted over all years, the growing season changes by +4.9 days per decade at this station.

Frost dates and growing season at Philadelphia/Mt Holly WFO
MeasureMedian, all yearsEarliest periodRecent period (1996 to 2025)Recent against earliestFitted trend
Last spring frost16 Apriln/a16 Apriln/a-1.9 days per decade
First autumn frost31 Octobern/a31 Octobern/a+2.9 days per decade
Growing days201 daysn/a200 daysn/a+4.9 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

32 years, 1994 to 2025

A day with at least 70.4 mm (2.8 in) of rain is expected about once in 2 years. A day with at least 202.7 mm (8.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Philadelphia/Mt Holly WFO: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years70.4 mm (2.8 in)
5 years97.5 mm (3.8 in)
10 years118.4 mm (4.7 in)
25 years148.6 mm (5.9 in)
50 years174.3 mm (6.9 in)Longer than the 32 years of record
100 years202.7 mm (8.0 in)Longer than the 32 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 32 years of values from 1994 to 2025.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 158.8 mm (6.3 in) in 2013; 148.1 mm (5.8 in) in 2011; 126.5 mm (5.0 in) in 2018.

Download the Data

  • Data for Philadelphia/Mt Holly WFO standing records by year: CSV or JSON. Field meanings are on the data page.
  • 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-14).