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Phila Franklin Inst Weather Records (USC00366886)

Record envelope, standing records and threshold days for Phila Franklin Inst (USC00366886), Pennsylvania, United States, with 34 years of record.

Key Facts for Phila Franklin Inst

  • Phila Franklin Inst (USC00366886) is a weather station in Pennsylvania, United States at 39.96 latitude and -75.17 longitude, 18 m (60 ft) above sea level.
  • The station reports from 1993 to 2026, 34 years of record.
  • 1,464 records set at Phila Franklin Inst still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Phila Franklin Inst set a daily record precipitation of 60.5 mm (2.4 in) on 29 September 2026 (provisional).

Provisional Records

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

About the Station

  • Location: Pennsylvania, United States, 39.96 latitude, -75.17 longitude.
  • Elevation: 18 m (60 ft).
  • Period of record: 1993 to 2026, 34 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

24 days at or beyond a record
Daily record high and record low at Phila Franklin Inst, with 2026 drawn through them The band shows the record high and record low for each calendar day at Phila Franklin Inst. The lines show the 2026 daily maximum and minimum. 24 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 Phila Franklin Inst. The lines show the 2026 daily maximum and minimum. 24 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Phila Franklin Inst, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan22.8 C (73.0 F)-20.6 C (-5.1 F)12.8 C (55.0 F)-12.8 C (9.0 F)
Feb25.6 C (78.1 F)-17.2 C (1.0 F)10.6 C (51.1 F)-14.4 C (6.1 F)
Mar32.2 C (90.0 F)-12.2 C (10.0 F)28.9 C (84.0 F)-4.4 C (24.1 F)
Apr36.7 C (98.1 F)-3.9 C (25.0 F)33.9 C (93.0 F)-0.6 C (30.9 F)
May36.7 C (98.1 F)4.4 C (39.9 F)36.7 C (98.1 F)7.8 C (46.0 F)
Jun39.4 C (102.9 F)10.0 C (50.0 F)36.1 C (97.0 F)11.1 C (52.0 F)
Jul40.0 C (104.0 F)13.9 C (57.0 F)40.0 C (104.0 F)18.3 C (64.9 F)
Aug39.4 C (102.9 F)11.7 C (53.1 F)35.6 C (96.1 F)17.8 C (64.0 F)
Sep37.2 C (99.0 F)6.7 C (44.1 F)22.8 C (73.0 F)15.0 C (59.0 F)
Oct35.0 C (95.0 F)-0.6 C (30.9 F)n/an/a
Nov28.3 C (82.9 F)-6.7 C (19.9 F)n/an/a
Dec22.8 C (73.0 F)-14.4 C (6.1 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Phila Franklin Inst by the year they were set 1,464 records at Phila Franklin Inst still stand. 1996 holds the most, with 72. 0204060801993: 301994: 481995: 501996: 721997: 371998: 451999: 382000: 722001: 392002: 602003: 342004: 352005: 612006: 462007: 472008: 512009: 472010: 562011: 342012: 332013: 382014: 502015: 662016: 392017: 452018: 562019: 292020: 192021: 342022: 362023: 332024: 282025: 322026: 24199319972001200520092013201720212025
1,464 records at Phila Franklin Inst still stand. 1996 holds the most, with 72.
Standing records at Phila Franklin Inst by the year they were set
Year setStanding records
199330
199448
199550
199672
199737
199845
199938
200072
200139
200260
200334
200435
200561
200646
200747
200851
200947
201056
201134
201233
201338
201450
201566
201639
201745
201856
201929
202019
202134
202236
202333
202428
202532
202624

Wettest Day of Each Month

Sep: 190.5 mm (7.5 in)
Record daily precipitation for each month at Phila Franklin Inst The wettest day on record for each calendar month at Phila Franklin Inst. The most was 190.5 mm (7.5 in) on 28 September 2004. 050100150200 Jan: 62.7 mm (2.5 in), 23 January 1998 Jan Feb: 57.9 mm (2.3 in), 17 February 2003 Feb Mar: 67.8 mm (2.7 in), 23 March 2024 Mar Apr: 81.3 mm (3.2 in), 16 April 2018 Apr May: 71.9 mm (2.8 in), 24 May 1999 May Jun: 106.7 mm (4.2 in), 26 June 2006 Jun Jul: 129.5 mm (5.1 in), 12 July 2004 Jul Aug: 145.5 mm (5.7 in), 27 August 2011 Aug Sep: 190.5 mm (7.5 in), 28 September 2004 Sep Oct: 129.5 mm (5.1 in), 8 October 2005 Oct Nov: 72.4 mm (2.9 in), 28 November 1993 Nov Dec: 83.6 mm (3.3 in), 14 December 1996 Dec
The wettest day on record for each calendar month at Phila Franklin Inst. The most was 190.5 mm (7.5 in) on 28 September 2004.
Record daily precipitation for each month at Phila Franklin Inst
MonthRecord daily precipitation (mm)Date
Jan62.7 mm (2.5 in)23 January 1998
Feb57.9 mm (2.3 in)17 February 2003
Mar67.8 mm (2.7 in)23 March 2024
Apr81.3 mm (3.2 in)16 April 2018
May71.9 mm (2.8 in)24 May 1999
Jun106.7 mm (4.2 in)26 June 2006
Jul129.5 mm (5.1 in)12 July 2004
Aug145.5 mm (5.7 in)27 August 2011
Sep190.5 mm (7.5 in)28 September 2004
Oct129.5 mm (5.1 in)8 October 2005
Nov72.4 mm (2.9 in)28 November 1993
Dec83.6 mm (3.3 in)14 December 1996

Period of Record Coverage

1993 to 2026
Days with data per year at Phila Franklin Inst 34 years of record at Phila Franklin Inst, 1993 to 2026. 3 years have data for under 90 percent of days and are left out of rankings: 1993, 2020, 2026. 1993: 152 of 365 days1994: 365 of 365 days1995: 358 of 365 days1996: 364 of 366 days1997: 360 of 365 days1998: 362 of 365 days1999: 364 of 365 days2000: 366 of 366 days2001: 335 of 365 days2002: 355 of 365 days2003: 357 of 365 days2004: 365 of 366 days2005: 363 of 365 days2006: 365 of 365 days2007: 364 of 365 days2008: 361 of 366 days2009: 365 of 365 days2010: 364 of 365 days2011: 362 of 365 days2012: 366 of 366 days2013: 364 of 365 days2014: 363 of 365 days2015: 365 of 365 days2016: 359 of 366 days2017: 333 of 365 days2018: 340 of 365 days2019: 351 of 365 days2020: 251 of 366 days2021: 363 of 365 days2022: 363 of 365 days2023: 365 of 365 days2024: 336 of 366 days2025: 362 of 365 days2026: 236 of 365 days1995200020052010201520202025
34 years of record at Phila Franklin Inst, 1993 to 2026. 3 years have data for under 90 percent of days and are left out of rankings: 1993, 2020, 2026.
Days with data per year at Phila Franklin Inst
YearDays with dataShare of yearComplete
199315242%No
1994365100%Yes
199535898%Yes
199636499%Yes
199736099%Yes
199836299%Yes
1999364100%Yes
2000366100%Yes
200133592%Yes
200235597%Yes
200335798%Yes
2004365100%Yes
200536399%Yes
2006365100%Yes
2007364100%Yes
200836199%Yes
2009365100%Yes
2010364100%Yes
201136299%Yes
2012366100%Yes
2013364100%Yes
201436399%Yes
2015365100%Yes
201635998%Yes
201733391%Yes
201834093%Yes
201935196%Yes
202025169%No
202136399%Yes
202236399%Yes
2023365100%Yes
202433692%Yes
202536299%Yes
202623665%No

Latest Records

20
Latest records at Phila Franklin Inst
DateStationRecordValueBeat old record byOld record stoodSignificance
29 September 2026Phila Franklin Inst, USdaily rain (Provisional)60.5 mm (2.4 in)38.7 mm (1.5 in)27 years28 of 100 (Routine)
7 August 2026Phila Franklin Inst, USdaily high min (Tie)25.6 C (78.1 F)tie24 years2 of 100 (Routine)
17 July 2026Phila Franklin Inst, USdaily high min (Tie)27.2 C (81.0 F)tie20 years2 of 100 (Routine)
4 July 2026Phila Franklin Inst, USdaily high min30.0 C (86.0 F)2.2 C (4.0 F)24 years18 of 100 (Routine)
4 July 2026Phila Franklin Inst, USdaily high max39.4 C (102.9 F)1.1 C (2.0 F)27 years14 of 100 (Routine)
3 July 2026Phila Franklin Inst, USall-time high max (Tie)40.0 C (104.0 F)tie26 years7 of 100 (Routine)
2 July 2026Phila Franklin Inst, USdaily high max (Tie)37.2 C (99.0 F)tie24 years2 of 100 (Routine)
13 June 2026Phila Franklin Inst, USdaily high max36.1 C (97.0 F)0.5 C (0.9 F)24 years11 of 100 (Routine)
12 June 2026Phila Franklin Inst, USdaily high max36.1 C (97.0 F)1.1 C (2.0 F)13 years9 of 100 (Routine)
24 May 2026Phila Franklin Inst, USdaily low max13.9 C (57.0 F)2.8 C (5.0 F)23 years14 of 100 (Routine)
24 May 2026Phila Franklin Inst, USdaily low min (Tie)10.6 C (51.1 F)tie20 years2 of 100 (Routine)
21 May 2026Phila Franklin Inst, USdaily high max35.6 C (96.1 F)2.8 C (5.0 F)29 years16 of 100 (Routine)
21 May 2026Phila Franklin Inst, USdaily high min (Tie)21.7 C (71.1 F)tie29 years2 of 100 (Routine)
20 May 2026Phila Franklin Inst, USdaily high min22.8 C (73.0 F)0.6 C (1.1 F)7 years6 of 100 (Routine)
20 May 2026Phila Franklin Inst, USmonthly high max (Tie)36.7 C (98.1 F)tie19 years4 of 100 (Routine)
19 May 2026Phila Franklin Inst, USdaily high max35.6 C (96.1 F)1.2 C (2.2 F)8 years7 of 100 (Routine)
21 April 2026Phila Franklin Inst, USdaily low max (Tie)12.8 C (55.0 F)tie25 years2 of 100 (Routine)
15 April 2026Phila Franklin Inst, USdaily high max31.1 C (88.0 F)1.1 C (2.0 F)3 years4 of 100 (Routine)
9 April 2026Phila Franklin Inst, USdaily low min (Tie)-0.6 C (30.9 F)tie25 years2 of 100 (Routine)
5 April 2026Phila Franklin Inst, USdaily high max28.9 C (84.0 F)2.2 C (4.0 F)3 years6 of 100 (Routine)

Climate Trend

28 complete years, 1994 to 2025
Annual mean temperature at Phila Franklin Inst as warming stripes, 1994 to 2025 One stripe for each of 28 complete years at Phila Franklin Inst, 1994 to 2025. Blue stripes are years cooler than the station's own mean of 14.4 C (57.9 F); red stripes are warmer. The coolest year was 1996, at 12.9 C (55.2 F), and the warmest was 1998, at 15.6 C (60.1 F). The strongest colour marks a difference of 1.5 C (2.7 F). 1994: 13.7 C, -0.7 C from the station mean1995: 13.8 C, -0.6 C from the station mean1996: 12.9 C, -1.5 C from the station mean1997: 13.7 C, -0.7 C from the station mean1998: 15.6 C, +1.2 C from the station mean1999: 14.7 C, +0.3 C from the station mean2000: 13.5 C, -0.8 C from the station mean2002: 15.4 C, +1.0 C from the station mean2003: 14.0 C, -0.4 C from the station mean2004: 14.3 C, -0.1 C from the station mean2005: 15.1 C, +0.7 C from the station mean2006: 15.4 C, +1.0 C from the station mean2007: 13.5 C, -0.8 C from the station mean2008: 14.1 C, -0.3 C from the station mean2009: 13.5 C, -0.9 C from the station mean2010: 14.7 C, +0.3 C from the station mean2011: 14.7 C, +0.3 C from the station mean2012: 15.1 C, +0.7 C from the station mean2013: 13.9 C, -0.5 C from the station mean2014: 13.2 C, -1.2 C from the station mean2015: 14.2 C, -0.2 C from the station mean2016: 14.8 C, +0.4 C from the station mean2018: 14.5 C, +0.1 C from the station mean2019: 14.7 C, +0.3 C from the station mean2021: 15.2 C, +0.8 C from the station mean2022: 14.8 C, +0.4 C from the station mean2023: 15.3 C, +0.9 C from the station mean2025: 14.4 C, 0.0 C from the station mean1994200020052010201520202025
One stripe for each of 28 complete years at Phila Franklin Inst, 1994 to 2025. Blue stripes are years cooler than the station's own mean of 14.4 C (57.9 F); red stripes are warmer. The coolest year was 1996, at 12.9 C (55.2 F), and the warmest was 1998, at 15.6 C (60.1 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Phila Franklin Inst as warming stripes, 1994 to 2025
YearAnnual mean temperatureDifference from the station mean
199413.7 C-0.69 C
199513.8 C-0.62 C
199612.9 C-1.49 C
199713.7 C-0.67 C
199815.6 C+1.25 C
199914.7 C+0.32 C
200013.5 C-0.84 C
200215.4 C+1.00 C
200314.0 C-0.36 C
200414.3 C-0.12 C
200515.1 C+0.68 C
200615.4 C+0.99 C
200713.5 C-0.84 C
200814.1 C-0.26 C
200913.5 C-0.90 C
201014.7 C+0.34 C
201114.7 C+0.34 C
201215.1 C+0.72 C
201313.9 C-0.50 C
201413.2 C-1.17 C
201514.2 C-0.18 C
201614.8 C+0.45 C
201814.5 C+0.12 C
201914.7 C+0.32 C
202115.2 C+0.79 C
202214.8 C+0.40 C
202315.3 C+0.94 C
202514.4 C+0.01 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

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 Phila Franklin Inst: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)40.0 C (104.0 F)199937.8 C (100.0 F)34
Coldest night (TNn)-20.6 C (-5.1 F)1994-12.5 C (9.5 F)34
Wettest day (Rx1day)190.5 mm (7.5 in)200465.9 mm (2.6 in)34
Wettest five days (Rx5day)227.4 mm (9.0 in)200690.7 mm (3.6 in)34
Longest dry spell (CDD)42 days202417 days34

Hottest day (TXx)

Hottest day (TXx) at Phila Franklin Inst by year The hottest day of the year at Phila Franklin Inst, 1993 to 2026. The record is 40.0 C (104.0 F) in 1999, marked on the chart; the median year is 37.8 C (100.0 F). 34363840200020102020Record: 40.0 C (104.0 F) in 1999
The hottest day of the year at Phila Franklin Inst, 1993 to 2026. The record is 40.0 C (104.0 F) in 1999, marked on the chart; the median year is 37.8 C (100.0 F).
Hottest day (TXx) at Phila Franklin Inst by year
YearHottest day (TXx)
199335.6 C (96.1 F)
199438.3 C (100.9 F)
199539.4 C (102.9 F)
199636.1 C (97.0 F)
199737.8 C (100.0 F)
199835.6 C (96.1 F)
199940.0 C (104.0 F)
200036.1 C (97.0 F)
200139.4 C (102.9 F)
200238.9 C (102.0 F)
200337.8 C (100.0 F)
200435.6 C (96.1 F)
200540.0 C (104.0 F)
200640.0 C (104.0 F)
200735.6 C (96.1 F)
200837.2 C (99.0 F)
200935.0 C (95.0 F)
201039.4 C (102.9 F)
201140.0 C (104.0 F)
201238.3 C (100.9 F)
201337.2 C (99.0 F)
201435.6 C (96.1 F)
201536.1 C (97.0 F)
201637.2 C (99.0 F)
201736.7 C (98.1 F)
201838.3 C (100.9 F)
201937.8 C (100.0 F)
202037.2 C (99.0 F)
202137.8 C (100.0 F)
202237.2 C (99.0 F)
202337.2 C (99.0 F)
202438.3 C (100.9 F)
202539.4 C (102.9 F)
202640.0 C (104.0 F)

Coldest night (TNn)

Coldest night (TNn) at Phila Franklin Inst by year The coldest night of the year at Phila Franklin Inst, 1993 to 2026. The record is -20.6 C (-5.1 F) in 1994, marked on the chart; the median year is -12.5 C (9.5 F). -25-20-15-10-5200020102020Record: -20.6 C (-5.1 F) in 1994
The coldest night of the year at Phila Franklin Inst, 1993 to 2026. The record is -20.6 C (-5.1 F) in 1994, marked on the chart; the median year is -12.5 C (9.5 F).
Coldest night (TNn) at Phila Franklin Inst by year
YearColdest night (TNn)
1993-9.4 C (15.1 F)
1994-20.6 C (-5.1 F)
1995-15.0 C (5.0 F)
1996-15.6 C (3.9 F)
1997-16.1 C (3.0 F)
1998-7.8 C (18.0 F)
1999-12.2 C (10.0 F)
2000-13.9 C (7.0 F)
2001-6.7 C (19.9 F)
2002-6.7 C (19.9 F)
2003-11.7 C (10.9 F)
2004-13.3 C (8.1 F)
2005-13.9 C (7.0 F)
2006-8.9 C (16.0 F)
2007-13.3 C (8.1 F)
2008-12.2 C (10.0 F)
2009-14.4 C (6.1 F)
2010-9.4 C (15.1 F)
2011-12.8 C (9.0 F)
2012-10.6 C (12.9 F)
2013-10.6 C (12.9 F)
2014-16.1 C (3.0 F)
2015-17.2 C (1.0 F)
2016-13.9 C (7.0 F)
2017-10.6 C (12.9 F)
2018-13.9 C (7.0 F)
2019-15.0 C (5.0 F)
2020-9.4 C (15.1 F)
2021-7.2 C (19.0 F)
2022-14.4 C (6.1 F)
2023-10.0 C (14.0 F)
2024-11.1 C (12.0 F)
2025-12.2 C (10.0 F)
2026-14.4 C (6.1 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Phila Franklin Inst by year The wettest day of the year at Phila Franklin Inst, 1993 to 2026. The record is 190.5 mm (7.5 in) in 2004, marked on the chart; the median year is 65.9 mm (2.6 in). 050100150200200020102020Record: 190.5 mm (7.5 in) in 2004
The wettest day of the year at Phila Franklin Inst, 1993 to 2026. The record is 190.5 mm (7.5 in) in 2004, marked on the chart; the median year is 65.9 mm (2.6 in).
Wettest day (Rx1day) at Phila Franklin Inst by year
YearWettest day (Rx1day)
199372.4 mm (2.9 in)
199495.0 mm (3.7 in)
199544.5 mm (1.8 in)
199683.6 mm (3.3 in)
199751.6 mm (2.0 in)
199862.7 mm (2.5 in)
1999141.7 mm (5.6 in)
200065.8 mm (2.6 in)
200163.8 mm (2.5 in)
200266.0 mm (2.6 in)
200357.9 mm (2.3 in)
2004190.5 mm (7.5 in)
2005129.5 mm (5.1 in)
2006106.7 mm (4.2 in)
200778.7 mm (3.1 in)
200850.8 mm (2.0 in)
200953.6 mm (2.1 in)
2010111.8 mm (4.4 in)
2011145.5 mm (5.7 in)
201255.9 mm (2.2 in)
201382.8 mm (3.3 in)
201462.7 mm (2.5 in)
201571.1 mm (2.8 in)
201661.0 mm (2.4 in)
201747.0 mm (1.9 in)
201881.3 mm (3.2 in)
201951.3 mm (2.0 in)
2020100.3 mm (3.9 in)
202166.3 mm (2.6 in)
202254.1 mm (2.1 in)
202351.6 mm (2.0 in)
202467.8 mm (2.7 in)
202540.4 mm (1.6 in)
202660.5 mm (2.4 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Phila Franklin Inst by year The wettest five days of the year at Phila Franklin Inst, 1993 to 2026. The record is 227.4 mm (9.0 in) in 2006, marked on the chart; the median year is 90.7 mm (3.6 in). 050100150200250200020102020Record: 227.4 mm (9.0 in) in 2006
The wettest five days of the year at Phila Franklin Inst, 1993 to 2026. The record is 227.4 mm (9.0 in) in 2006, marked on the chart; the median year is 90.7 mm (3.6 in).
Wettest five days (Rx5day) at Phila Franklin Inst by year
YearWettest five days (Rx5day)
199372.7 mm (2.9 in)
1994147.8 mm (5.8 in)
199552.7 mm (2.1 in)
1996110.6 mm (4.4 in)
199776.2 mm (3.0 in)
199894.7 mm (3.7 in)
1999205.9 mm (8.1 in)
200069.0 mm (2.7 in)
200167.7 mm (2.7 in)
200279.0 mm (3.1 in)
200392.0 mm (3.6 in)
2004153.4 mm (6.0 in)
2005193.0 mm (7.6 in)
2006227.4 mm (9.0 in)
2007165.4 mm (6.5 in)
200879.8 mm (3.1 in)
200989.4 mm (3.5 in)
2010159.8 mm (6.3 in)
2011188.8 mm (7.4 in)
201275.0 mm (3.0 in)
2013152.8 mm (6.0 in)
201495.4 mm (3.8 in)
2015103.4 mm (4.1 in)
201693.0 mm (3.7 in)
201784.1 mm (3.3 in)
2018177.8 mm (7.0 in)
201982.0 mm (3.2 in)
202044.4 mm (1.7 in)
202176.5 mm (3.0 in)
202255.4 mm (2.2 in)
202351.6 mm (2.0 in)
202499.6 mm (3.9 in)
202566.3 mm (2.6 in)
202629.5 mm (1.2 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Phila Franklin Inst by year The longest dry spell of the year at Phila Franklin Inst, 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 Phila Franklin Inst, 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 Phila Franklin Inst by year
YearLongest dry spell (CDD)
19939 days
199420 days
199524 days
19969 days
199716 days
199816 days
199921 days
200021 days
200117 days
200230 days
200313 days
200417 days
200515 days
200618 days
200720 days
200815 days
200918 days
201018 days
201117 days
201213 days
201315 days
201412 days
201522 days
201617 days
201713 days
201812 days
201911 days
202014 days
20219 days
202212 days
202320 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

28 years with a frost

Across 28 years with a frost, the median last spring frost at Phila Franklin Inst falls on 30 March and the median first autumn frost on 22 November, which leaves a median of 234 days between them.

Fitted over all years, the growing season changes by -1.8 days per decade at this station.

Frost dates and growing season at Phila Franklin Inst
MeasureMedian, all yearsEarliest periodRecent period (1994 to 2025)Recent against earliestFitted trend
Last spring frost30 Marchn/a30 Marchn/a+2.2 days per decade
First autumn frost22 Novembern/a22 Novembern/a+0.4 days per decade
Growing days234 daysn/a234 daysn/a-1.8 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.

Download the Data

  • Data for Phila Franklin Inst standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Phila Franklin Inst 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). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-17).