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Philadelphia Shawmont Weather Records (USC00366904)

Record envelope, standing records and threshold days for Philadelphia Shawmont (USC00366904), Pennsylvania, United States, with 62 years of record.

Key Facts for Philadelphia Shawmont

  • Philadelphia Shawmont (USC00366904) is a weather station in Pennsylvania, United States at 40.03 latitude and -75.25 longitude, 21 m (69 ft) above sea level.
  • The station reports from 1896 to 1957, 62 years of record.
  • 1,464 records set at Philadelphia Shawmont still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Philadelphia Shawmont set a daily record high minimum temperature of 23.3 C (73.9 F) on 19 June 1957.

About the Station

  • Location: Pennsylvania, United States, 40.03 latitude, -75.25 longitude.
  • Elevation: 21 m (69 ft).
  • Period of record: 1896 to 1957, 62 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Philadelphia Shawmont, with 2026 drawn through them The band shows the record high and record low for each calendar day at Philadelphia Shawmont. The lines show the 2026 daily maximum and minimum. 0 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 Shawmont. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Philadelphia Shawmont, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan23.3 C (73.9 F)-21.7 C (-7.1 F)n/an/a
Feb24.4 C (75.9 F)-24.4 C (-11.9 F)n/an/a
Mar30.6 C (87.1 F)-14.4 C (6.1 F)n/an/a
Apr32.2 C (90.0 F)-10.0 C (14.0 F)n/an/a
May35.0 C (95.0 F)-1.1 C (30.0 F)n/an/a
Jun37.8 C (100.0 F)5.6 C (42.1 F)n/an/a
Jul40.0 C (104.0 F)7.8 C (46.0 F)n/an/a
Aug38.9 C (102.0 F)2.2 C (36.0 F)n/an/a
Sep38.9 C (102.0 F)0.6 C (33.1 F)n/an/a
Oct34.4 C (93.9 F)-4.4 C (24.1 F)n/an/a
Nov28.9 C (84.0 F)-12.8 C (9.0 F)n/an/a
Dec22.2 C (72.0 F)-20.0 C (-4.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Philadelphia Shawmont by the year they were set 1,464 records at Philadelphia Shawmont still stand. 1917 holds the most, with 69. 0204060801899: 451900: 481901: 261917: 691918: 361919: 241920: 181921: 301922: 221923: 531924: 251925: 421926: 401927: 261928: 281929: 471930: 371931: 311932: 391933: 361934: 501935: 331936: 411937: 251938: 241939: 171940: 471941: 321942: 361943: 261944: 131945: 361946: 431947: 281948: 251949: 291950: 401951: 241952: 201953: 311954: 301955: 331956: 391957: 20189919191924192919341939194419491954
1,464 records at Philadelphia Shawmont still stand. 1917 holds the most, with 69.
Standing records at Philadelphia Shawmont by the year they were set
Year setStanding records
189945
190048
190126
191769
191836
191924
192018
192130
192222
192353
192425
192542
192640
192726
192828
192947
193037
193131
193239
193336
193450
193533
193641
193725
193824
193917
194047
194132
194236
194326
194413
194536
194643
194728
194825
194929
195040
195124
195220
195331
195430
195533
195639
195720

Wettest Day of Each Month

Aug: 149.1 mm (5.9 in)
Record daily precipitation for each month at Philadelphia Shawmont The wettest day on record for each calendar month at Philadelphia Shawmont. The most was 149.1 mm (5.9 in) on 31 August 1911. 050100150 Jan: 62.2 mm (2.4 in), 3 January 1936 Jan Feb: 67.3 mm (2.6 in), 20 February 1924 Feb Mar: 66.0 mm (2.6 in), 11 March 1952 Mar Apr: 63.5 mm (2.5 in), 3 April 1915 Apr May: 133.4 mm (5.3 in), 19 May 1900 May Jun: 91.7 mm (3.6 in), 27 June 1938 Jun Jul: 111.3 mm (4.4 in), 15 July 1931 Jul Aug: 149.1 mm (5.9 in), 31 August 1911 Aug Sep: 94.5 mm (3.7 in), 16 September 1900 Sep Oct: 88.9 mm (3.5 in), 9 October 1903 Oct Nov: 81.3 mm (3.2 in), 25 November 1950 Nov Dec: 63.5 mm (2.5 in), 29 December 1901 Dec
The wettest day on record for each calendar month at Philadelphia Shawmont. The most was 149.1 mm (5.9 in) on 31 August 1911.
Record daily precipitation for each month at Philadelphia Shawmont
MonthRecord daily precipitation (mm)Date
Jan62.2 mm (2.4 in)3 January 1936
Feb67.3 mm (2.6 in)20 February 1924
Mar66.0 mm (2.6 in)11 March 1952
Apr63.5 mm (2.5 in)3 April 1915
May133.4 mm (5.3 in)19 May 1900
Jun91.7 mm (3.6 in)27 June 1938
Jul111.3 mm (4.4 in)15 July 1931
Aug149.1 mm (5.9 in)31 August 1911
Sep94.5 mm (3.7 in)16 September 1900
Oct88.9 mm (3.5 in)9 October 1903
Nov81.3 mm (3.2 in)25 November 1950
Dec63.5 mm (2.5 in)29 December 1901

Period of Record Coverage

1899 to 1957
Days with data per year at Philadelphia Shawmont 44 years of record at Philadelphia Shawmont, 1899 to 1957. 6 years have data for under 90 percent of days and are left out of rankings: 1901, 1918, 1919, 1920, 1949, 1957. 1899: 360 of 365 days1900: 353 of 365 days1901: 272 of 365 days1917: 362 of 365 days1918: 150 of 365 days1919: 243 of 365 days1920: 272 of 366 days1921: 365 of 365 days1922: 330 of 365 days1923: 359 of 365 days1924: 365 of 366 days1925: 365 of 365 days1926: 365 of 365 days1927: 333 of 365 days1928: 365 of 366 days1929: 365 of 365 days1930: 364 of 365 days1931: 365 of 365 days1932: 366 of 366 days1933: 365 of 365 days1934: 365 of 365 days1935: 364 of 365 days1936: 366 of 366 days1937: 365 of 365 days1938: 365 of 365 days1939: 365 of 365 days1940: 366 of 366 days1941: 365 of 365 days1942: 365 of 365 days1943: 365 of 365 days1944: 366 of 366 days1945: 365 of 365 days1946: 365 of 365 days1947: 365 of 365 days1948: 365 of 366 days1949: 302 of 365 days1950: 358 of 365 days1951: 363 of 365 days1952: 365 of 366 days1953: 365 of 365 days1954: 361 of 365 days1955: 365 of 365 days1956: 358 of 366 days1957: 179 of 365 days19001920193019401950
44 years of record at Philadelphia Shawmont, 1899 to 1957. 6 years have data for under 90 percent of days and are left out of rankings: 1901, 1918, 1919, 1920, 1949, 1957.
Days with data per year at Philadelphia Shawmont
YearDays with dataShare of yearComplete
189936099%Yes
190035397%Yes
190127275%No
191736299%Yes
191815041%No
191924367%No
192027274%No
1921365100%Yes
192233090%Yes
192335998%Yes
1924365100%Yes
1925365100%Yes
1926365100%Yes
192733391%Yes
1928365100%Yes
1929365100%Yes
1930364100%Yes
1931365100%Yes
1932366100%Yes
1933365100%Yes
1934365100%Yes
1935364100%Yes
1936366100%Yes
1937365100%Yes
1938365100%Yes
1939365100%Yes
1940366100%Yes
1941365100%Yes
1942365100%Yes
1943365100%Yes
1944366100%Yes
1945365100%Yes
1946365100%Yes
1947365100%Yes
1948365100%Yes
194930283%No
195035898%Yes
195136399%Yes
1952365100%Yes
1953365100%Yes
195436199%Yes
1955365100%Yes
195635898%Yes
195717949%No

Latest Records

20
Latest records at Philadelphia Shawmont
DateStationRecordValueBeat old record byOld record stoodSignificance
19 June 1957Philadelphia Shawmont, USdaily high min23.3 C (73.9 F)1.6 C (2.9 F)40 years21 of 100 (Routine)
18 June 1957Philadelphia Shawmont, USdaily high min22.2 C (72.0 F)0.5 C (0.9 F)32 years15 of 100 (Routine)
18 June 1957Philadelphia Shawmont, USdaily high max36.7 C (98.1 F)1.7 C (3.1 F)18 years14 of 100 (Routine)
17 June 1957Philadelphia Shawmont, USdaily high max35.6 C (96.1 F)0.6 C (1.1 F)18 years11 of 100 (Routine)
16 June 1957Philadelphia Shawmont, USmonthly high max (Tie)37.8 C (100.0 F)tie57 years8 of 100 (Routine)
10 June 1957Philadelphia Shawmont, USdaily low min7.2 C (45.0 F)0.6 C (1.1 F)11 years9 of 100 (Routine)
9 June 1957Philadelphia Shawmont, USdaily low min6.7 C (44.1 F)1.1 C (2.0 F)8 years9 of 100 (Routine)
24 May 1957Philadelphia Shawmont, USdaily high min19.4 C (66.9 F)1.6 C (2.9 F)2 years8 of 100 (Routine)
20 May 1957Philadelphia Shawmont, USdaily low max (Tie)15.0 C (59.0 F)tie7 years1 of 100 (Routine)
14 May 1957Philadelphia Shawmont, USdaily high min17.8 C (64.0 F)0.6 C (1.1 F)24 years13 of 100 (Routine)
4 May 1957Philadelphia Shawmont, USdaily low min (Tie)2.2 C (36.0 F)tie26 years3 of 100 (Routine)
4 May 1957Philadelphia Shawmont, USdaily low max (Tie)12.8 C (55.0 F)tie22 years2 of 100 (Routine)
29 April 1957Philadelphia Shawmont, USdaily high max30.6 C (87.1 F)1.2 C (2.2 F)0 years7 of 100 (Routine)
28 April 1957Philadelphia Shawmont, USdaily high max31.1 C (88.0 F)1.7 C (3.1 F)19 years13 of 100 (Routine)
27 April 1957Philadelphia Shawmont, USdaily high max31.7 C (89.1 F)1.1 C (2.0 F)15 years10 of 100 (Routine)
24 April 1957Philadelphia Shawmont, USdaily high min19.4 C (66.9 F)2.7 C (4.9 F)11 years14 of 100 (Routine)
24 April 1957Philadelphia Shawmont, USdaily high max (Tie)28.3 C (82.9 F)tie32 years3 of 100 (Routine)
22 April 1957Philadelphia Shawmont, USdaily high max28.9 C (84.0 F)1.1 C (2.0 F)4 years7 of 100 (Routine)
2 April 1957Philadelphia Shawmont, USdaily rain25.4 mm (1.0 in)5.1 mm (0.20 in)36 years22 of 100 (Routine)
14 March 1957Philadelphia Shawmont, USdaily high max (Tie)23.3 C (73.9 F)tie11 years2 of 100 (Routine)

Climate Trend

34 complete years, 1899 to 1956
Annual mean temperature at Philadelphia Shawmont as warming stripes, 1899 to 1956 One stripe for each of 34 complete years at Philadelphia Shawmont, 1899 to 1956. Blue stripes are years cooler than the station's own mean of 12.5 C (54.4 F); red stripes are warmer. The coolest year was 1926, at 11.0 C (51.7 F), and the warmest was 1921, at 13.7 C (56.6 F). The strongest colour marks a difference of 1.6 C (2.9 F). 1899: 11.4 C, -1.0 C from the station mean1917: 11.7 C, -0.8 C from the station mean1921: 13.7 C, +1.2 C from the station mean1924: 11.2 C, -1.3 C from the station mean1925: 12.2 C, -0.3 C from the station mean1926: 11.0 C, -1.5 C from the station mean1928: 12.2 C, -0.3 C from the station mean1929: 12.3 C, -0.1 C from the station mean1930: 12.6 C, +0.2 C from the station mean1931: 13.4 C, +1.0 C from the station mean1932: 12.9 C, +0.4 C from the station mean1933: 12.8 C, +0.4 C from the station mean1934: 12.2 C, -0.3 C from the station mean1935: 12.1 C, -0.4 C from the station mean1936: 12.4 C, -0.1 C from the station mean1937: 12.6 C, +0.1 C from the station mean1938: 12.7 C, +0.2 C from the station mean1939: 12.8 C, +0.3 C from the station mean1940: 11.0 C, -1.5 C from the station mean1941: 12.6 C, +0.2 C from the station mean1942: 12.5 C, 0.0 C from the station mean1943: 12.2 C, -0.2 C from the station mean1944: 12.4 C, -0.1 C from the station mean1945: 12.5 C, 0.0 C from the station mean1946: 13.1 C, +0.6 C from the station mean1947: 12.5 C, 0.0 C from the station mean1948: 12.4 C, -0.1 C from the station mean1950: 12.4 C, -0.1 C from the station mean1951: 12.9 C, +0.4 C from the station mean1952: 13.0 C, +0.6 C from the station mean1953: 13.6 C, +1.2 C from the station mean1954: 13.1 C, +0.6 C from the station mean1955: 13.0 C, +0.5 C from the station mean1956: 12.6 C, +0.1 C from the station mean189919051910191519201925193019351940194519501955
One stripe for each of 34 complete years at Philadelphia Shawmont, 1899 to 1956. Blue stripes are years cooler than the station's own mean of 12.5 C (54.4 F); red stripes are warmer. The coolest year was 1926, at 11.0 C (51.7 F), and the warmest was 1921, at 13.7 C (56.6 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Philadelphia Shawmont as warming stripes, 1899 to 1956
YearAnnual mean temperatureDifference from the station mean
189911.4 C-1.02 C
191711.7 C-0.81 C
192113.7 C+1.21 C
192411.2 C-1.30 C
192512.2 C-0.28 C
192611.0 C-1.51 C
192812.2 C-0.28 C
192912.3 C-0.12 C
193012.6 C+0.18 C
193113.4 C+0.96 C
193212.9 C+0.42 C
193312.8 C+0.38 C
193412.2 C-0.30 C
193512.1 C-0.41 C
193612.4 C-0.08 C
193712.6 C+0.09 C
193812.7 C+0.24 C
193912.8 C+0.31 C
194011.0 C-1.46 C
194112.6 C+0.17 C
194212.5 C+0.04 C
194312.2 C-0.22 C
194412.4 C-0.05 C
194512.5 C+0.01 C
194613.1 C+0.62 C
194712.5 C+0.03 C
194812.4 C-0.11 C
195012.4 C-0.11 C
195112.9 C+0.43 C
195213.0 C+0.58 C
195313.6 C+1.16 C
195413.1 C+0.59 C
195513.0 C+0.53 C
195612.6 C+0.13 C

The annual mean temperature here has risen by 0.2 C (0.1 to 0.4) per decade over 1899 to 1956. In Fahrenheit: 0.4 F (0.1 to 0.7) per decade. The slope is a straight line fitted to 34 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Philadelphia Shawmont
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.2 C (0.1 to 0.4) per decade0.4 F (0.1 to 0.7) per decade1899 to 195634Rise
Mean daily maximum0.4 C (0.2 to 0.6) per decade0.7 F (0.3 to 1.1) per decade1899 to 195634Rise
Mean daily minimum0.1 C (-0.1 to 0.2) per decade0.2 F (-0.1 to 0.4) per decade1899 to 195634Not clearly different from zero

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

1896 to 1957
Yearly extremes at Philadelphia Shawmont: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)40.0 C (104.0 F)190136.4 C (97.5 F)44
Coldest night (TNn)-24.4 C (-11.9 F)1934-15.3 C (4.5 F)44
Wettest day (Rx1day)149.1 mm (5.9 in)191162.6 mm (2.5 in)62
Wettest five days (Rx5day)246.9 mm (9.7 in)191194.2 mm (3.7 in)62
Longest dry spell (CDD)37 days192417 days62

Hottest day (TXx)

Hottest day (TXx) at Philadelphia Shawmont by year The hottest day of the year at Philadelphia Shawmont, 1896 to 1957. The record is 40.0 C (104.0 F) in 1901, marked on the chart; the median year is 36.4 C (97.5 F). 3234363840190019201940Record: 40.0 C (104.0 F) in 1901
The hottest day of the year at Philadelphia Shawmont, 1896 to 1957. The record is 40.0 C (104.0 F) in 1901, marked on the chart; the median year is 36.4 C (97.5 F).
Hottest day (TXx) at Philadelphia Shawmont by year
YearHottest day (TXx)
1896n/a
1897n/a
1898n/a
189937.8 C (100.0 F)
190037.8 C (100.0 F)
190140.0 C (104.0 F)
1902n/a
1903n/a
1904n/a
1905n/a
1906n/a
1907n/a
1908n/a
1909n/a
1910n/a
1911n/a
1912n/a
1913n/a
1914n/a
1915n/a
1916n/a
191738.9 C (102.0 F)
191832.2 C (90.0 F)
191937.8 C (100.0 F)
192034.4 C (93.9 F)
192135.6 C (96.1 F)
192233.9 C (93.0 F)
192337.2 C (99.0 F)
192435.6 C (96.1 F)
192536.7 C (98.1 F)
192637.2 C (99.0 F)
192733.9 C (93.0 F)
192835.0 C (95.0 F)
192935.0 C (95.0 F)
193037.8 C (100.0 F)
193137.2 C (99.0 F)
193235.6 C (96.1 F)
193337.2 C (99.0 F)
193437.8 C (100.0 F)
193534.4 C (93.9 F)
193640.0 C (104.0 F)
193736.7 C (98.1 F)
193834.4 C (93.9 F)
193935.0 C (95.0 F)
194037.2 C (99.0 F)
194136.1 C (97.0 F)
194235.6 C (96.1 F)
194335.6 C (96.1 F)
194436.1 C (97.0 F)
194536.1 C (97.0 F)
194636.7 C (98.1 F)
194735.0 C (95.0 F)
194837.2 C (99.0 F)
194935.6 C (96.1 F)
195035.0 C (95.0 F)
195135.0 C (95.0 F)
195237.2 C (99.0 F)
195338.9 C (102.0 F)
195437.8 C (100.0 F)
195537.8 C (100.0 F)
195635.6 C (96.1 F)
195737.8 C (100.0 F)

Coldest night (TNn)

Coldest night (TNn) at Philadelphia Shawmont by year The coldest night of the year at Philadelphia Shawmont, 1896 to 1957. The record is -24.4 C (-11.9 F) in 1934, marked on the chart; the median year is -15.3 C (4.5 F). -25-20-15-10190019201940Record: -24.4 C (-11.9 F) in 1934
The coldest night of the year at Philadelphia Shawmont, 1896 to 1957. The record is -24.4 C (-11.9 F) in 1934, marked on the chart; the median year is -15.3 C (4.5 F).
Coldest night (TNn) at Philadelphia Shawmont by year
YearColdest night (TNn)
1896n/a
1897n/a
1898n/a
1899-22.2 C (-8.0 F)
1900-15.6 C (3.9 F)
1901-13.3 C (8.1 F)
1902n/a
1903n/a
1904n/a
1905n/a
1906n/a
1907n/a
1908n/a
1909n/a
1910n/a
1911n/a
1912n/a
1913n/a
1914n/a
1915n/a
1916n/a
1917-20.0 C (-4.0 F)
1918-20.0 C (-4.0 F)
1919-17.8 C (0.0 F)
1920-17.8 C (0.0 F)
1921-14.4 C (6.1 F)
1922-16.7 C (1.9 F)
1923-12.8 C (9.0 F)
1924-14.4 C (6.1 F)
1925-18.3 C (-0.9 F)
1926-14.4 C (6.1 F)
1927-15.6 C (3.9 F)
1928-17.2 C (1.0 F)
1929-13.3 C (8.1 F)
1930-14.4 C (6.1 F)
1931-10.0 C (14.0 F)
1932-14.4 C (6.1 F)
1933-18.3 C (-0.9 F)
1934-24.4 C (-11.9 F)
1935-21.7 C (-7.1 F)
1936-18.3 C (-0.9 F)
1937-10.6 C (12.9 F)
1938-12.8 C (9.0 F)
1939-13.3 C (8.1 F)
1940-15.0 C (5.0 F)
1941-11.1 C (12.0 F)
1942-19.4 C (-2.9 F)
1943-17.2 C (1.0 F)
1944-13.3 C (8.1 F)
1945-16.7 C (1.9 F)
1946-12.8 C (9.0 F)
1947-14.4 C (6.1 F)
1948-16.7 C (1.9 F)
1949-12.2 C (10.0 F)
1950-15.0 C (5.0 F)
1951-16.7 C (1.9 F)
1952-13.3 C (8.1 F)
1953-10.6 C (12.9 F)
1954-17.8 C (0.0 F)
1955-15.6 C (3.9 F)
1956-10.0 C (14.0 F)
1957-16.7 C (1.9 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Philadelphia Shawmont by year The wettest day of the year at Philadelphia Shawmont, 1896 to 1957. The record is 149.1 mm (5.9 in) in 1911, marked on the chart; the median year is 62.6 mm (2.5 in). 050100150190019201940Record: 149.1 mm (5.9 in) in 1911
The wettest day of the year at Philadelphia Shawmont, 1896 to 1957. The record is 149.1 mm (5.9 in) in 1911, marked on the chart; the median year is 62.6 mm (2.5 in).
Wettest day (Rx1day) at Philadelphia Shawmont by year
YearWettest day (Rx1day)
189650.8 mm (2.0 in)
189777.5 mm (3.1 in)
189872.9 mm (2.9 in)
189945.7 mm (1.8 in)
1900133.4 mm (5.3 in)
190163.5 mm (2.5 in)
190256.4 mm (2.2 in)
190388.9 mm (3.5 in)
1904111.8 mm (4.4 in)
190547.2 mm (1.9 in)
190653.8 mm (2.1 in)
190753.3 mm (2.1 in)
190878.7 mm (3.1 in)
190965.5 mm (2.6 in)
191077.2 mm (3.0 in)
1911149.1 mm (5.9 in)
191281.3 mm (3.2 in)
191348.8 mm (1.9 in)
191450.8 mm (2.0 in)
191583.8 mm (3.3 in)
191662.5 mm (2.5 in)
191753.8 mm (2.1 in)
191853.3 mm (2.1 in)
191985.1 mm (3.4 in)
192049.5 mm (1.9 in)
192153.3 mm (2.1 in)
192262.2 mm (2.4 in)
192357.2 mm (2.3 in)
192468.8 mm (2.7 in)
192557.2 mm (2.3 in)
192641.1 mm (1.6 in)
1927110.0 mm (4.3 in)
192863.5 mm (2.5 in)
192966.0 mm (2.6 in)
193052.3 mm (2.1 in)
1931111.3 mm (4.4 in)
193261.0 mm (2.4 in)
193383.1 mm (3.3 in)
193467.3 mm (2.6 in)
193586.6 mm (3.4 in)
193662.2 mm (2.4 in)
193773.7 mm (2.9 in)
193891.7 mm (3.6 in)
1939108.0 mm (4.3 in)
194064.0 mm (2.5 in)
194148.3 mm (1.9 in)
194254.1 mm (2.1 in)
194359.7 mm (2.4 in)
194461.0 mm (2.4 in)
194552.1 mm (2.1 in)
194678.7 mm (3.1 in)
194762.7 mm (2.5 in)
194850.8 mm (2.0 in)
194940.4 mm (1.6 in)
195088.9 mm (3.5 in)
195155.9 mm (2.2 in)
195266.0 mm (2.6 in)
195350.8 mm (2.0 in)
195458.9 mm (2.3 in)
1955115.6 mm (4.6 in)
195670.4 mm (2.8 in)
195725.4 mm (1.0 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Philadelphia Shawmont by year The wettest five days of the year at Philadelphia Shawmont, 1896 to 1957. The record is 246.9 mm (9.7 in) in 1911, marked on the chart; the median year is 94.2 mm (3.7 in). 050100150200250190019201940Record: 246.9 mm (9.7 in) in 1911
The wettest five days of the year at Philadelphia Shawmont, 1896 to 1957. The record is 246.9 mm (9.7 in) in 1911, marked on the chart; the median year is 94.2 mm (3.7 in).
Wettest five days (Rx5day) at Philadelphia Shawmont by year
YearWettest five days (Rx5day)
189664.1 mm (2.5 in)
1897175.5 mm (6.9 in)
189898.6 mm (3.9 in)
189963.0 mm (2.5 in)
1900143.6 mm (5.7 in)
1901105.4 mm (4.1 in)
190296.2 mm (3.8 in)
1903146.3 mm (5.8 in)
1904124.5 mm (4.9 in)
190579.2 mm (3.1 in)
1906108.7 mm (4.3 in)
190770.8 mm (2.8 in)
190888.8 mm (3.5 in)
190966.8 mm (2.6 in)
1910115.3 mm (4.5 in)
1911246.9 mm (9.7 in)
1912125.3 mm (4.9 in)
191381.2 mm (3.2 in)
191490.9 mm (3.6 in)
1915146.9 mm (5.8 in)
191682.3 mm (3.2 in)
191777.5 mm (3.1 in)
191865.5 mm (2.6 in)
1919244.4 mm (9.6 in)
192071.9 mm (2.8 in)
192170.6 mm (2.8 in)
1922116.6 mm (4.6 in)
192376.2 mm (3.0 in)
192499.5 mm (3.9 in)
192577.0 mm (3.0 in)
192678.5 mm (3.1 in)
1927121.7 mm (4.8 in)
1928100.6 mm (4.0 in)
192992.8 mm (3.7 in)
193060.9 mm (2.4 in)
1931123.5 mm (4.9 in)
193284.4 mm (3.3 in)
1933183.0 mm (7.2 in)
193492.4 mm (3.6 in)
1935154.4 mm (6.1 in)
193677.7 mm (3.1 in)
193780.9 mm (3.2 in)
1938184.1 mm (7.2 in)
1939122.5 mm (4.8 in)
194089.0 mm (3.5 in)
194190.5 mm (3.6 in)
194282.8 mm (3.3 in)
1943108.3 mm (4.3 in)
1944124.7 mm (4.9 in)
1945105.9 mm (4.2 in)
1946176.0 mm (6.9 in)
194785.1 mm (3.4 in)
194892.4 mm (3.6 in)
194976.2 mm (3.0 in)
195095.5 mm (3.8 in)
195189.9 mm (3.5 in)
1952124.2 mm (4.9 in)
195398.6 mm (3.9 in)
195465.1 mm (2.6 in)
1955146.4 mm (5.8 in)
1956115.1 mm (4.5 in)
195748.3 mm (1.9 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Philadelphia Shawmont by year The longest dry spell of the year at Philadelphia Shawmont, 1896 to 1957. The record is 37 days in 1924, marked on the chart; the median year is 17 days. 10203040190019201940Record: 37 days in 1924
The longest dry spell of the year at Philadelphia Shawmont, 1896 to 1957. The record is 37 days in 1924, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Philadelphia Shawmont by year
YearLongest dry spell (CDD)
189611 days
189717 days
189814 days
189910 days
190016 days
190127 days
190217 days
190318 days
190418 days
190514 days
190617 days
190713 days
190815 days
190924 days
191027 days
191117 days
191216 days
191316 days
191424 days
191515 days
191614 days
191722 days
191816 days
191911 days
192012 days
192119 days
192224 days
192324 days
192437 days
192516 days
192618 days
192713 days
192812 days
192913 days
193021 days
193119 days
193214 days
193315 days
193417 days
193514 days
193617 days
193713 days
193816 days
193918 days
194013 days
194133 days
194218 days
194318 days
194413 days
194512 days
194617 days
194732 days
194817 days
194918 days
195012 days
195116 days
195229 days
195319 days
195418 days
195516 days
195613 days
195711 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

34 years with a frost

Across 34 years with a frost, the median last spring frost at Philadelphia Shawmont falls on 17 April and the median first autumn frost on 26 October, which leaves a median of 190 days between them.

Fitted over all years, the growing season changes by +2.0 days per decade at this station.

Frost dates and growing season at Philadelphia Shawmont
MeasureMedian, all yearsEarliest periodRecent period (1925 to 1956)Recent against earliestFitted trend
Last spring frost17 Apriln/a18 Apriln/a+0.7 days per decade
First autumn frost26 Octobern/a27 Octobern/a+2.6 days per decade
Growing days190 daysn/a189 daysn/a+2.0 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

55 years, 1897 to 1956

A day with at least 63.7 mm (2.5 in) of rain is expected about once in 2 years. A day with at least 167.6 mm (6.6 in) of rain is expected about once in 100 years.

Rainfall return levels at Philadelphia Shawmont: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years63.7 mm (2.5 in)
5 years82.2 mm (3.2 in)
10 years97.5 mm (3.8 in)
25 years121.2 mm (4.8 in)
50 years142.5 mm (5.6 in)
100 years167.6 mm (6.6 in)Longer than the 55 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, 55 years of values from 1897 to 1956.

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: 149.1 mm (5.9 in) in 1911; 133.4 mm (5.3 in) in 1900; 115.6 mm (4.6 in) in 1955.

Download the Data

  • Data for Philadelphia Shawmont standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Philadelphia Shawmont 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 (2025-12-31).