Phila Intl AP Weather Records (USW00013739)
Record envelope, standing records and threshold days for Phila Intl AP (USW00013739), Pennsylvania, United States, with 87 years of record.
Key Facts for Phila Intl AP
- Phila Intl AP (USW00013739) is a weather station in Pennsylvania, United States at 39.87 latitude and -75.23 longitude, 2 m (7 ft) above sea level.
- The station reports from 1940 to 2026, 87 years of record.
- 1,464 records set at Phila Intl AP still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Phila Intl AP set a daily record high minimum temperature of 25.6 C (78.1 F) on 6 August 2026.
About the Station
- Location: Pennsylvania, United States, 39.87 latitude, -75.23 longitude.
- Elevation: 2 m (7 ft).
- Period of record: 1940 to 2026, 87 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
12 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 23.3 C (73.9 F) | -21.7 C (-7.1 F) | 13.9 C (57.0 F) | -12.2 C (10.0 F) |
| Feb | 25.0 C (77.0 F) | -20.0 C (-4.0 F) | 15.6 C (60.1 F) | -13.3 C (8.1 F) |
| Mar | 30.6 C (87.1 F) | -13.9 C (7.0 F) | 28.3 C (82.9 F) | -3.3 C (26.1 F) |
| Apr | 35.0 C (95.0 F) | -7.2 C (19.0 F) | 32.8 C (91.0 F) | -0.6 C (30.9 F) |
| May | 36.7 C (98.1 F) | -2.2 C (28.0 F) | 36.7 C (98.1 F) | 8.3 C (46.9 F) |
| Jun | 38.3 C (100.9 F) | 6.7 C (44.1 F) | 36.7 C (98.1 F) | 11.7 C (53.1 F) |
| Jul | 40.0 C (104.0 F) | 10.6 C (51.1 F) | 39.4 C (102.9 F) | 18.3 C (64.9 F) |
| Aug | 38.3 C (100.9 F) | 6.7 C (44.1 F) | 34.4 C (93.9 F) | 17.8 C (64.0 F) |
| Sep | 37.8 C (100.0 F) | 1.7 C (35.1 F) | 33.9 C (93.0 F) | 12.2 C (54.0 F) |
| Oct | 35.6 C (96.1 F) | -3.9 C (25.0 F) | 30.6 C (87.1 F) | 8.9 C (48.0 F) |
| Nov | 28.9 C (84.0 F) | -9.4 C (15.1 F) | n/a | n/a |
| Dec | 22.8 C (73.0 F) | -17.2 C (1.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1940 | 28 |
| 1941 | 15 |
| 1942 | 22 |
| 1943 | 23 |
| 1944 | 11 |
| 1945 | 21 |
| 1946 | 22 |
| 1947 | 27 |
| 1948 | 12 |
| 1949 | 16 |
| 1950 | 23 |
| 1951 | 19 |
| 1952 | 11 |
| 1953 | 15 |
| 1954 | 22 |
| 1955 | 17 |
| 1956 | 20 |
| 1957 | 15 |
| 1958 | 9 |
| 1959 | 24 |
| 1960 | 27 |
| 1961 | 24 |
| 1962 | 27 |
| 1963 | 39 |
| 1964 | 31 |
| 1965 | 25 |
| 1966 | 24 |
| 1967 | 19 |
| 1968 | 10 |
| 1969 | 4 |
| 1970 | 21 |
| 1971 | 11 |
| 1972 | 15 |
| 1973 | 12 |
| 1974 | 18 |
| 1975 | 13 |
| 1976 | 29 |
| 1977 | 18 |
| 1978 | 12 |
| 1979 | 28 |
| 1980 | 9 |
| 1981 | 7 |
| 1982 | 18 |
| 1983 | 19 |
| 1984 | 17 |
| 1985 | 9 |
| 1986 | 9 |
| 1987 | 9 |
| 1988 | 22 |
| 1989 | 22 |
| 1990 | 24 |
| 1991 | 29 |
| 1992 | 10 |
| 1993 | 15 |
| 1994 | 12 |
| 1995 | 18 |
| 1996 | 11 |
| 1997 | 9 |
| 1998 | 15 |
| 1999 | 11 |
| 2000 | 19 |
| 2001 | 13 |
| 2002 | 32 |
| 2003 | 6 |
| 2004 | 3 |
| 2005 | 10 |
| 2006 | 10 |
| 2007 | 10 |
| 2008 | 10 |
| 2009 | 10 |
| 2010 | 20 |
| 2011 | 14 |
| 2012 | 13 |
| 2013 | 13 |
| 2014 | 15 |
| 2015 | 31 |
| 2016 | 19 |
| 2017 | 21 |
| 2018 | 25 |
| 2019 | 11 |
| 2020 | 5 |
| 2021 | 12 |
| 2022 | 17 |
| 2023 | 13 |
| 2024 | 10 |
| 2025 | 10 |
| 2026 | 18 |
All-Time Record Progression
17 new records| Date | Kind | Detail |
|---|---|---|
| 1970-01-09 | Record low maximum temperature | Record low maximum temperature -12.8 C (9.0 F) |
| 1971-08-27 | Record daily precipitation | Record daily precipitation 121.2 mm (4.8 in) |
| 1977-01-17 | Record low maximum temperature | Record low maximum temperature -13.3 C (8.1 F) |
| 1978-02-07 | Record snow depth | Record snow depth 35.6 cm (14.0 in) |
| 1979-02-19 | Record daily snowfall | Record daily snowfall 35.3 cm (13.9 in) |
| 1979-02-20 | Record snow depth | Record snow depth 50.8 cm (20.0 in) |
| 1982-01-17 | Record low minimum temperature | Record low minimum temperature -21.7 C (-7.1 F) |
| 1983-02-11 | Record daily snowfall | Record daily snowfall 53.6 cm (21.1 in) |
| 1983-02-12 | Record snow depth | Record snow depth 55.9 cm (22.0 in) |
| 1993-07-10 | Record high minimum temperature | Record high minimum temperature 27.2 C (81.0 F) |
| 1994-01-19 | Record low maximum temperature | Record low maximum temperature -14.4 C (6.1 F) |
| 1996-01-07 | Record daily snowfall | Record daily snowfall 70.1 cm (27.6 in) |
| 1996-01-08 | Record snow depth | Record snow depth 71.1 cm (28.0 in) |
| 1999-09-16 | Record daily precipitation | Record daily precipitation 168.4 mm (6.6 in) |
| 2001-08-08 | Record high minimum temperature | Record high minimum temperature 27.8 C (82.0 F) |
| 2010-07-24 | Record high minimum temperature | Record high minimum temperature 28.3 C (82.9 F) |
| 2013-07-28 | Record daily precipitation | Record daily precipitation 203.7 mm (8.0 in) |
Wettest Day of Each Month
Jul: 203.7 mm (8.0 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 58.9 mm (2.3 in) | 23 January 1998 |
| Feb | 49.5 mm (1.9 in) | 13 February 1966 |
| Mar | 78.5 mm (3.1 in) | 23 March 2024 |
| Apr | 112.3 mm (4.4 in) | 30 April 2014 |
| May | 63.2 mm (2.5 in) | 2 May 1989 |
| Jun | 117.3 mm (4.6 in) | 29 June 1973 |
| Jul | 203.7 mm (8.0 in) | 28 July 2013 |
| Aug | 122.9 mm (4.8 in) | 14 August 2011 |
| Sep | 168.4 mm (6.6 in) | 16 September 1999 |
| Oct | 140.5 mm (5.5 in) | 8 October 2005 |
| Nov | 101.3 mm (4.0 in) | 7 November 1977 |
| Dec | 73.7 mm (2.9 in) | 13 December 1941 |
Period of Record Coverage
1940 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1940 | 184 | 50% | No |
| 1941 | 365 | 100% | Yes |
| 1942 | 365 | 100% | Yes |
| 1943 | 365 | 100% | Yes |
| 1944 | 366 | 100% | Yes |
| 1945 | 204 | 56% | No |
| 1946 | 365 | 100% | Yes |
| 1947 | 365 | 100% | Yes |
| 1948 | 366 | 100% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 365 | 100% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 365 | 100% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 365 | 100% | Yes |
| 1983 | 365 | 100% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 365 | 100% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 365 | 100% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 366 | 100% | Yes |
| 1993 | 365 | 100% | Yes |
| 1994 | 365 | 100% | Yes |
| 1995 | 365 | 100% | Yes |
| 1996 | 366 | 100% | Yes |
| 1997 | 365 | 100% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 365 | 100% | Yes |
| 2000 | 366 | 100% | Yes |
| 2001 | 365 | 100% | Yes |
| 2002 | 365 | 100% | Yes |
| 2003 | 365 | 100% | Yes |
| 2004 | 366 | 100% | Yes |
| 2005 | 365 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 365 | 100% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 366 | 100% | Yes |
| 2013 | 365 | 100% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 366 | 100% | Yes |
| 2017 | 365 | 100% | Yes |
| 2018 | 365 | 100% | Yes |
| 2019 | 365 | 100% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 365 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 282 | 77% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 6 August 2026 | Phila Intl AP, US | daily high min | 25.6 C (78.1 F) | 1.2 C (2.2 F) | 71 years | 32 of 100 (Routine) |
| 5 August 2026 | Phila Intl AP, US | daily rain | 39.4 mm (1.6 in) | 9.9 mm (0.39 in) | 48 years | 28 of 100 (Routine) |
| 9 July 2026 | Phila Intl AP, US | daily rain | 68.6 mm (2.7 in) | 23.1 mm (0.9 in) | 73 years | 43 of 100 (Notable) |
| 3 July 2026 | Phila Intl AP, US | daily high min | 27.8 C (82.0 F) | 2.8 C (5.0 F) | 24 years | 24 of 100 (Routine) |
| 2 July 2026 | Phila Intl AP, US | daily high max | 39.4 C (102.9 F) | 1.6 C (2.9 F) | 60 years | 30 of 100 (Routine) |
| 2 July 2026 | Phila Intl AP, US | daily high min | 26.7 C (80.1 F) | 2.8 C (5.0 F) | 12 years | 20 of 100 (Routine) |
| 12 June 2026 | Phila Intl AP, US | daily high max | 36.7 C (98.1 F) | 1.7 C (3.1 F) | 79 years | 35 of 100 (Notable) |
| 11 June 2026 | Phila Intl AP, US | daily high max | 36.1 C (97.0 F) | 1.1 C (2.0 F) | 40 years | 22 of 100 (Routine) |
| 11 June 2026 | Phila Intl AP, US | daily high min (Tie) | 22.8 C (73.0 F) | tie | 52 years | 5 of 100 (Routine) |
| 20 May 2026 | Phila Intl AP, US | daily high max | 35.0 C (95.0 F) | 0.6 C (1.1 F) | 64 years | 28 of 100 (Routine) |
| 19 May 2026 | Phila Intl AP, US | monthly high max | 36.7 C (98.1 F) | 0.6 C (1.1 F) | 34 years | 29 of 100 (Routine) |
| 18 May 2026 | Phila Intl AP, US | daily high max | 35.6 C (96.1 F) | 1.2 C (2.2 F) | 64 years | 29 of 100 (Routine) |
| 17 April 2026 | Phila Intl AP, US | monthly high min (Tie) | 19.4 C (66.9 F) | tie | 14 years | 5 of 100 (Routine) |
| 16 April 2026 | Phila Intl AP, US | daily high min | 18.3 C (64.9 F) | 1.6 C (2.9 F) | 24 years | 18 of 100 (Routine) |
| 16 April 2026 | Phila Intl AP, US | daily high max | 32.8 C (91.0 F) | 0.6 C (1.1 F) | 24 years | 16 of 100 (Routine) |
| 15 April 2026 | Phila Intl AP, US | daily high max | 32.8 C (91.0 F) | 1.7 C (3.1 F) | 84 years | 35 of 100 (Notable) |
| 4 April 2026 | Phila Intl AP, US | daily high max | 28.9 C (84.0 F) | 2.8 C (5.0 F) | 76 years | 34 of 100 (Routine) |
| 1 April 2026 | Phila Intl AP, US | daily high max | 28.9 C (84.0 F) | 1.7 C (3.1 F) | 48 years | 24 of 100 (Routine) |
| 31 March 2026 | Phila Intl AP, US | monthly high min | 16.7 C (62.1 F) | 0.6 C (1.1 F) | 28 years | 27 of 100 (Routine) |
| 11 March 2026 | Phila Intl AP, US | daily high max | 28.3 C (82.9 F) | 5.0 C (9.0 F) | 4 years | 17 of 100 (Routine) |
Climate Trend
84 complete years, 1941 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1941 | 12.7 C | -0.38 C |
| 1942 | 12.4 C | -0.67 C |
| 1943 | 12.0 C | -1.00 C |
| 1944 | 12.3 C | -0.72 C |
| 1946 | 13.0 C | +0.00 C |
| 1947 | 12.3 C | -0.78 C |
| 1948 | 12.3 C | -0.78 C |
| 1949 | 13.9 C | +0.85 C |
| 1950 | 12.4 C | -0.68 C |
| 1951 | 13.0 C | -0.02 C |
| 1952 | 13.3 C | +0.26 C |
| 1953 | 13.8 C | +0.74 C |
| 1954 | 13.2 C | +0.13 C |
| 1955 | 13.0 C | -0.02 C |
| 1956 | 12.3 C | -0.73 C |
| 1957 | 12.9 C | -0.19 C |
| 1958 | 11.5 C | -1.58 C |
| 1959 | 13.1 C | +0.03 C |
| 1960 | 11.6 C | -1.49 C |
| 1961 | 11.5 C | -1.53 C |
| 1962 | 11.2 C | -1.89 C |
| 1963 | 11.1 C | -1.99 C |
| 1964 | 12.3 C | -0.79 C |
| 1965 | 11.7 C | -1.38 C |
| 1966 | 11.6 C | -1.40 C |
| 1967 | 11.9 C | -1.19 C |
| 1968 | 12.3 C | -0.77 C |
| 1969 | 12.1 C | -0.96 C |
| 1970 | 12.5 C | -0.57 C |
| 1971 | 13.1 C | +0.04 C |
| 1972 | 12.2 C | -0.80 C |
| 1973 | 13.5 C | +0.49 C |
| 1974 | 13.0 C | -0.09 C |
| 1975 | 13.4 C | +0.32 C |
| 1976 | 12.3 C | -0.71 C |
| 1977 | 12.4 C | -0.67 C |
| 1978 | 11.9 C | -1.13 C |
| 1979 | 12.5 C | -0.57 C |
| 1980 | 12.5 C | -0.57 C |
| 1981 | 12.0 C | -1.00 C |
| 1982 | 12.3 C | -0.73 C |
| 1983 | 12.6 C | -0.44 C |
| 1984 | 12.1 C | -0.97 C |
| 1985 | 12.7 C | -0.35 C |
| 1986 | 12.9 C | -0.10 C |
| 1987 | 13.0 C | -0.03 C |
| 1988 | 12.5 C | -0.53 C |
| 1989 | 12.5 C | -0.59 C |
| 1990 | 14.2 C | +1.11 C |
| 1991 | 14.5 C | +1.42 C |
| 1992 | 12.9 C | -0.15 C |
| 1993 | 13.7 C | +0.66 C |
| 1994 | 13.7 C | +0.64 C |
| 1995 | 13.6 C | +0.55 C |
| 1996 | 12.0 C | -1.00 C |
| 1997 | 12.6 C | -0.41 C |
| 1998 | 14.5 C | +1.44 C |
| 1999 | 13.7 C | +0.70 C |
| 2000 | 12.6 C | -0.47 C |
| 2001 | 13.9 C | +0.89 C |
| 2002 | 14.2 C | +1.13 C |
| 2003 | 12.7 C | -0.35 C |
| 2004 | 13.0 C | -0.02 C |
| 2005 | 13.3 C | +0.28 C |
| 2006 | 14.2 C | +1.11 C |
| 2007 | 13.5 C | +0.41 C |
| 2008 | 13.5 C | +0.50 C |
| 2009 | 13.1 C | +0.07 C |
| 2010 | 14.2 C | +1.16 C |
| 2011 | 14.3 C | +1.23 C |
| 2012 | 14.9 C | +1.86 C |
| 2013 | 13.5 C | +0.43 C |
| 2014 | 12.9 C | -0.14 C |
| 2015 | 14.3 C | +1.21 C |
| 2016 | 14.7 C | +1.61 C |
| 2017 | 14.4 C | +1.39 C |
| 2018 | 13.7 C | +0.62 C |
| 2019 | 14.0 C | +0.99 C |
| 2020 | 14.5 C | +1.43 C |
| 2021 | 14.5 C | +1.49 C |
| 2022 | 14.5 C | +1.47 C |
| 2023 | 14.7 C | +1.70 C |
| 2024 | 14.9 C | +1.89 C |
| 2025 | 14.0 C | +0.96 C |
The annual mean temperature here has risen by 0.3 C (0.2 to 0.3) per decade over 1941 to 2025. In Fahrenheit: 0.5 F (0.3 to 0.6) per decade. The slope is a straight line fitted to 84 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.3 C (0.2 to 0.3) per decade | 0.5 F (0.3 to 0.6) per decade | 1941 to 2025 | 84 | Rise |
| Mean daily maximum | 0.2 C (0.1 to 0.3) per decade | 0.3 F (0.2 to 0.5) per decade | 1941 to 2025 | 84 | Rise |
| Mean daily minimum | 0.3 C (0.3 to 0.4) per decade | 0.6 F (0.5 to 0.7) per decade | 1941 to 2025 | 84 | Rise |
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
1940 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 40.0 C (104.0 F) | 1966 | 36.1 C (97.0 F) | 87 |
| Coldest night (TNn) | -21.7 C (-7.1 F) | 1982 | -13.9 C (7.0 F) | 87 |
| Wettest day (Rx1day) | 203.7 mm (8.0 in) | 2013 | 68.6 mm (2.7 in) | 87 |
| Wettest five days (Rx5day) | 243.6 mm (9.6 in) | 2013 | 95.5 mm (3.8 in) | 87 |
| Longest dry spell (CDD) | 42 days | 2024 | 19 days | 87 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1940 | 37.8 C (100.0 F) |
| 1941 | 37.8 C (100.0 F) |
| 1942 | 37.2 C (99.0 F) |
| 1943 | 36.1 C (97.0 F) |
| 1944 | 36.1 C (97.0 F) |
| 1945 | 36.1 C (97.0 F) |
| 1946 | 35.6 C (96.1 F) |
| 1947 | 35.0 C (95.0 F) |
| 1948 | 37.8 C (100.0 F) |
| 1949 | 37.2 C (99.0 F) |
| 1950 | 33.9 C (93.0 F) |
| 1951 | 35.0 C (95.0 F) |
| 1952 | 37.8 C (100.0 F) |
| 1953 | 38.3 C (100.9 F) |
| 1954 | 38.9 C (102.0 F) |
| 1955 | 37.8 C (100.0 F) |
| 1956 | 35.0 C (95.0 F) |
| 1957 | 38.3 C (100.9 F) |
| 1958 | 33.9 C (93.0 F) |
| 1959 | 36.1 C (97.0 F) |
| 1960 | 33.3 C (91.9 F) |
| 1961 | 33.9 C (93.0 F) |
| 1962 | 35.6 C (96.1 F) |
| 1963 | 36.1 C (97.0 F) |
| 1964 | 37.8 C (100.0 F) |
| 1965 | 34.4 C (93.9 F) |
| 1966 | 40.0 C (104.0 F) |
| 1967 | 33.9 C (93.0 F) |
| 1968 | 36.1 C (97.0 F) |
| 1969 | 34.4 C (93.9 F) |
| 1970 | 35.0 C (95.0 F) |
| 1971 | 35.6 C (96.1 F) |
| 1972 | 35.6 C (96.1 F) |
| 1973 | 37.2 C (99.0 F) |
| 1974 | 35.0 C (95.0 F) |
| 1975 | 37.2 C (99.0 F) |
| 1976 | 34.4 C (93.9 F) |
| 1977 | 37.8 C (100.0 F) |
| 1978 | 37.2 C (99.0 F) |
| 1979 | 34.4 C (93.9 F) |
| 1980 | 37.2 C (99.0 F) |
| 1981 | 35.0 C (95.0 F) |
| 1982 | 34.4 C (93.9 F) |
| 1983 | 37.2 C (99.0 F) |
| 1984 | 34.4 C (93.9 F) |
| 1985 | 33.9 C (93.0 F) |
| 1986 | 36.7 C (98.1 F) |
| 1987 | 36.1 C (97.0 F) |
| 1988 | 38.9 C (102.0 F) |
| 1989 | 34.4 C (93.9 F) |
| 1990 | 36.1 C (97.0 F) |
| 1991 | 37.8 C (100.0 F) |
| 1992 | 36.1 C (97.0 F) |
| 1993 | 38.3 C (100.9 F) |
| 1994 | 37.8 C (100.0 F) |
| 1995 | 39.4 C (102.9 F) |
| 1996 | 34.4 C (93.9 F) |
| 1997 | 36.7 C (98.1 F) |
| 1998 | 35.0 C (95.0 F) |
| 1999 | 37.8 C (100.0 F) |
| 2000 | 34.4 C (93.9 F) |
| 2001 | 38.3 C (100.9 F) |
| 2002 | 37.2 C (99.0 F) |
| 2003 | 36.1 C (97.0 F) |
| 2004 | 33.9 C (93.0 F) |
| 2005 | 36.7 C (98.1 F) |
| 2006 | 36.7 C (98.1 F) |
| 2007 | 36.1 C (97.0 F) |
| 2008 | 36.7 C (98.1 F) |
| 2009 | 35.0 C (95.0 F) |
| 2010 | 39.4 C (102.9 F) |
| 2011 | 39.4 C (102.9 F) |
| 2012 | 38.3 C (100.9 F) |
| 2013 | 36.7 C (98.1 F) |
| 2014 | 35.6 C (96.1 F) |
| 2015 | 35.6 C (96.1 F) |
| 2016 | 36.7 C (98.1 F) |
| 2017 | 35.6 C (96.1 F) |
| 2018 | 36.7 C (98.1 F) |
| 2019 | 36.7 C (98.1 F) |
| 2020 | 36.1 C (97.0 F) |
| 2021 | 36.1 C (97.0 F) |
| 2022 | 37.2 C (99.0 F) |
| 2023 | 36.1 C (97.0 F) |
| 2024 | 36.7 C (98.1 F) |
| 2025 | 38.3 C (100.9 F) |
| 2026 | 39.4 C (102.9 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1940 | -11.1 C (12.0 F) |
| 1941 | -11.1 C (12.0 F) |
| 1942 | -17.2 C (1.0 F) |
| 1943 | -16.1 C (3.0 F) |
| 1944 | -12.2 C (10.0 F) |
| 1945 | -16.7 C (1.9 F) |
| 1946 | -12.2 C (10.0 F) |
| 1947 | -15.0 C (5.0 F) |
| 1948 | -16.1 C (3.0 F) |
| 1949 | -10.0 C (14.0 F) |
| 1950 | -12.8 C (9.0 F) |
| 1951 | -13.3 C (8.1 F) |
| 1952 | -12.2 C (10.0 F) |
| 1953 | -10.0 C (14.0 F) |
| 1954 | -15.0 C (5.0 F) |
| 1955 | -15.0 C (5.0 F) |
| 1956 | -8.3 C (17.1 F) |
| 1957 | -15.0 C (5.0 F) |
| 1958 | -15.0 C (5.0 F) |
| 1959 | -12.8 C (9.0 F) |
| 1960 | -13.9 C (7.0 F) |
| 1961 | -20.0 C (-4.0 F) |
| 1962 | -16.1 C (3.0 F) |
| 1963 | -20.6 C (-5.1 F) |
| 1964 | -16.7 C (1.9 F) |
| 1965 | -15.0 C (5.0 F) |
| 1966 | -15.6 C (3.9 F) |
| 1967 | -15.6 C (3.9 F) |
| 1968 | -14.4 C (6.1 F) |
| 1969 | -11.7 C (10.9 F) |
| 1970 | -17.2 C (1.0 F) |
| 1971 | -14.4 C (6.1 F) |
| 1972 | -14.4 C (6.1 F) |
| 1973 | -13.3 C (8.1 F) |
| 1974 | -13.3 C (8.1 F) |
| 1975 | -10.6 C (12.9 F) |
| 1976 | -14.4 C (6.1 F) |
| 1977 | -20.0 C (-4.0 F) |
| 1978 | -13.3 C (8.1 F) |
| 1979 | -18.9 C (-2.0 F) |
| 1980 | -17.2 C (1.0 F) |
| 1981 | -17.8 C (0.0 F) |
| 1982 | -21.7 C (-7.1 F) |
| 1983 | -17.2 C (1.0 F) |
| 1984 | -21.7 C (-7.1 F) |
| 1985 | -21.1 C (-6.0 F) |
| 1986 | -12.8 C (9.0 F) |
| 1987 | -15.6 C (3.9 F) |
| 1988 | -16.1 C (3.0 F) |
| 1989 | -14.4 C (6.1 F) |
| 1990 | -12.2 C (10.0 F) |
| 1991 | -10.6 C (12.9 F) |
| 1992 | -11.7 C (10.9 F) |
| 1993 | -12.8 C (9.0 F) |
| 1994 | -20.6 C (-5.1 F) |
| 1995 | -15.0 C (5.0 F) |
| 1996 | -16.1 C (3.0 F) |
| 1997 | -14.4 C (6.1 F) |
| 1998 | -8.9 C (16.0 F) |
| 1999 | -11.1 C (12.0 F) |
| 2000 | -13.9 C (7.0 F) |
| 2001 | -9.4 C (15.1 F) |
| 2002 | -8.9 C (16.0 F) |
| 2003 | -13.3 C (8.1 F) |
| 2004 | -15.6 C (3.9 F) |
| 2005 | -16.1 C (3.0 F) |
| 2006 | -9.4 C (15.1 F) |
| 2007 | -12.2 C (10.0 F) |
| 2008 | -11.7 C (10.9 F) |
| 2009 | -14.4 C (6.1 F) |
| 2010 | -10.6 C (12.9 F) |
| 2011 | -13.3 C (8.1 F) |
| 2012 | -10.0 C (14.0 F) |
| 2013 | -11.1 C (12.0 F) |
| 2014 | -15.5 C (4.1 F) |
| 2015 | -16.6 C (2.1 F) |
| 2016 | -13.2 C (8.2 F) |
| 2017 | -12.7 C (9.1 F) |
| 2018 | -15.5 C (4.1 F) |
| 2019 | -14.9 C (5.2 F) |
| 2020 | -9.9 C (14.2 F) |
| 2021 | -7.1 C (19.2 F) |
| 2022 | -13.8 C (7.2 F) |
| 2023 | -9.3 C (15.3 F) |
| 2024 | -11.6 C (11.1 F) |
| 2025 | -12.1 C (10.2 F) |
| 2026 | -13.3 C (8.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1940 | 40.6 mm (1.6 in) |
| 1941 | 75.4 mm (3.0 in) |
| 1942 | 62.0 mm (2.4 in) |
| 1943 | 43.4 mm (1.7 in) |
| 1944 | 71.1 mm (2.8 in) |
| 1945 | 28.2 mm (1.1 in) |
| 1946 | 75.7 mm (3.0 in) |
| 1947 | 83.6 mm (3.3 in) |
| 1948 | 58.4 mm (2.3 in) |
| 1949 | 38.1 mm (1.5 in) |
| 1950 | 87.9 mm (3.5 in) |
| 1951 | 45.0 mm (1.8 in) |
| 1952 | 58.4 mm (2.3 in) |
| 1953 | 51.8 mm (2.0 in) |
| 1954 | 42.4 mm (1.7 in) |
| 1955 | 83.6 mm (3.3 in) |
| 1956 | 50.8 mm (2.0 in) |
| 1957 | 45.2 mm (1.8 in) |
| 1958 | 51.8 mm (2.0 in) |
| 1959 | 75.2 mm (3.0 in) |
| 1960 | 116.8 mm (4.6 in) |
| 1961 | 47.8 mm (1.9 in) |
| 1962 | 66.3 mm (2.6 in) |
| 1963 | 61.5 mm (2.4 in) |
| 1964 | 57.9 mm (2.3 in) |
| 1965 | 51.3 mm (2.0 in) |
| 1966 | 119.1 mm (4.7 in) |
| 1967 | 62.7 mm (2.5 in) |
| 1968 | 77.5 mm (3.1 in) |
| 1969 | 85.6 mm (3.4 in) |
| 1970 | 68.8 mm (2.7 in) |
| 1971 | 121.2 mm (4.8 in) |
| 1972 | 78.0 mm (3.1 in) |
| 1973 | 117.3 mm (4.6 in) |
| 1974 | 43.2 mm (1.7 in) |
| 1975 | 69.9 mm (2.8 in) |
| 1976 | 45.0 mm (1.8 in) |
| 1977 | 101.3 mm (4.0 in) |
| 1978 | 93.0 mm (3.7 in) |
| 1979 | 48.0 mm (1.9 in) |
| 1980 | 97.0 mm (3.8 in) |
| 1981 | 111.8 mm (4.4 in) |
| 1982 | 57.9 mm (2.3 in) |
| 1983 | 62.0 mm (2.4 in) |
| 1984 | 56.9 mm (2.2 in) |
| 1985 | 70.9 mm (2.8 in) |
| 1986 | 61.7 mm (2.4 in) |
| 1987 | 43.9 mm (1.7 in) |
| 1988 | 87.6 mm (3.4 in) |
| 1989 | 111.3 mm (4.4 in) |
| 1990 | 57.2 mm (2.3 in) |
| 1991 | 71.1 mm (2.8 in) |
| 1992 | 57.2 mm (2.3 in) |
| 1993 | 58.9 mm (2.3 in) |
| 1994 | 87.6 mm (3.4 in) |
| 1995 | 40.1 mm (1.6 in) |
| 1996 | 51.3 mm (2.0 in) |
| 1997 | 38.9 mm (1.5 in) |
| 1998 | 58.9 mm (2.3 in) |
| 1999 | 168.4 mm (6.6 in) |
| 2000 | 69.1 mm (2.7 in) |
| 2001 | 61.2 mm (2.4 in) |
| 2002 | 51.8 mm (2.0 in) |
| 2003 | 47.8 mm (1.9 in) |
| 2004 | 118.9 mm (4.7 in) |
| 2005 | 140.5 mm (5.5 in) |
| 2006 | 63.0 mm (2.5 in) |
| 2007 | 106.4 mm (4.2 in) |
| 2008 | 69.1 mm (2.7 in) |
| 2009 | 69.3 mm (2.7 in) |
| 2010 | 76.2 mm (3.0 in) |
| 2011 | 122.9 mm (4.8 in) |
| 2012 | 79.2 mm (3.1 in) |
| 2013 | 203.7 mm (8.0 in) |
| 2014 | 112.3 mm (4.4 in) |
| 2015 | 120.9 mm (4.8 in) |
| 2016 | 49.8 mm (2.0 in) |
| 2017 | 65.5 mm (2.6 in) |
| 2018 | 115.3 mm (4.5 in) |
| 2019 | 72.9 mm (2.9 in) |
| 2020 | 105.7 mm (4.2 in) |
| 2021 | 80.5 mm (3.2 in) |
| 2022 | 50.5 mm (2.0 in) |
| 2023 | 55.6 mm (2.2 in) |
| 2024 | 78.5 mm (3.1 in) |
| 2025 | 39.1 mm (1.5 in) |
| 2026 | 68.6 mm (2.7 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1940 | 83.4 mm (3.3 in) |
| 1941 | 97.8 mm (3.9 in) |
| 1942 | 149.9 mm (5.9 in) |
| 1943 | 91.0 mm (3.6 in) |
| 1944 | 138.9 mm (5.5 in) |
| 1945 | 53.9 mm (2.1 in) |
| 1946 | 148.1 mm (5.8 in) |
| 1947 | 111.8 mm (4.4 in) |
| 1948 | 87.2 mm (3.4 in) |
| 1949 | 79.5 mm (3.1 in) |
| 1950 | 92.5 mm (3.6 in) |
| 1951 | 74.9 mm (2.9 in) |
| 1952 | 95.5 mm (3.8 in) |
| 1953 | 97.1 mm (3.8 in) |
| 1954 | 62.1 mm (2.4 in) |
| 1955 | 143.3 mm (5.6 in) |
| 1956 | 103.6 mm (4.1 in) |
| 1957 | 85.3 mm (3.4 in) |
| 1958 | 78.6 mm (3.1 in) |
| 1959 | 86.1 mm (3.4 in) |
| 1960 | 186.2 mm (7.3 in) |
| 1961 | 93.2 mm (3.7 in) |
| 1962 | 98.0 mm (3.9 in) |
| 1963 | 90.0 mm (3.5 in) |
| 1964 | 82.6 mm (3.3 in) |
| 1965 | 58.4 mm (2.3 in) |
| 1966 | 119.4 mm (4.7 in) |
| 1967 | 90.2 mm (3.6 in) |
| 1968 | 127.3 mm (5.0 in) |
| 1969 | 119.8 mm (4.7 in) |
| 1970 | 91.2 mm (3.6 in) |
| 1971 | 166.9 mm (6.6 in) |
| 1972 | 99.9 mm (3.9 in) |
| 1973 | 137.6 mm (5.4 in) |
| 1974 | 74.0 mm (2.9 in) |
| 1975 | 152.7 mm (6.0 in) |
| 1976 | 55.8 mm (2.2 in) |
| 1977 | 112.6 mm (4.4 in) |
| 1978 | 101.4 mm (4.0 in) |
| 1979 | 101.6 mm (4.0 in) |
| 1980 | 100.3 mm (3.9 in) |
| 1981 | 112.3 mm (4.4 in) |
| 1982 | 89.9 mm (3.5 in) |
| 1983 | 76.3 mm (3.0 in) |
| 1984 | 116.5 mm (4.6 in) |
| 1985 | 118.4 mm (4.7 in) |
| 1986 | 86.1 mm (3.4 in) |
| 1987 | 67.1 mm (2.6 in) |
| 1988 | 117.0 mm (4.6 in) |
| 1989 | 115.6 mm (4.6 in) |
| 1990 | 70.2 mm (2.8 in) |
| 1991 | 73.6 mm (2.9 in) |
| 1992 | 86.1 mm (3.4 in) |
| 1993 | 83.5 mm (3.3 in) |
| 1994 | 161.0 mm (6.3 in) |
| 1995 | 46.5 mm (1.8 in) |
| 1996 | 90.5 mm (3.6 in) |
| 1997 | 61.1 mm (2.4 in) |
| 1998 | 81.9 mm (3.2 in) |
| 1999 | 177.3 mm (7.0 in) |
| 2000 | 81.3 mm (3.2 in) |
| 2001 | 85.8 mm (3.4 in) |
| 2002 | 71.6 mm (2.8 in) |
| 2003 | 75.9 mm (3.0 in) |
| 2004 | 122.7 mm (4.8 in) |
| 2005 | 166.5 mm (6.6 in) |
| 2006 | 113.0 mm (4.4 in) |
| 2007 | 157.4 mm (6.2 in) |
| 2008 | 89.5 mm (3.5 in) |
| 2009 | 92.9 mm (3.7 in) |
| 2010 | 146.3 mm (5.8 in) |
| 2011 | 196.1 mm (7.7 in) |
| 2012 | 94.0 mm (3.7 in) |
| 2013 | 243.6 mm (9.6 in) |
| 2014 | 125.5 mm (4.9 in) |
| 2015 | 121.7 mm (4.8 in) |
| 2016 | 61.0 mm (2.4 in) |
| 2017 | 72.0 mm (2.8 in) |
| 2018 | 184.1 mm (7.2 in) |
| 2019 | 121.7 mm (4.8 in) |
| 2020 | 143.1 mm (5.6 in) |
| 2021 | 140.7 mm (5.5 in) |
| 2022 | 97.7 mm (3.8 in) |
| 2023 | 91.0 mm (3.6 in) |
| 2024 | 86.9 mm (3.4 in) |
| 2025 | 79.0 mm (3.1 in) |
| 2026 | 119.4 mm (4.7 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1940 | 11 days |
| 1941 | 29 days |
| 1942 | 26 days |
| 1943 | 19 days |
| 1944 | 18 days |
| 1945 | 9 days |
| 1946 | 22 days |
| 1947 | 32 days |
| 1948 | 13 days |
| 1949 | 19 days |
| 1950 | 15 days |
| 1951 | 17 days |
| 1952 | 29 days |
| 1953 | 18 days |
| 1954 | 20 days |
| 1955 | 28 days |
| 1956 | 17 days |
| 1957 | 24 days |
| 1958 | 24 days |
| 1959 | 24 days |
| 1960 | 16 days |
| 1961 | 15 days |
| 1962 | 17 days |
| 1963 | 28 days |
| 1964 | 37 days |
| 1965 | 26 days |
| 1966 | 18 days |
| 1967 | 19 days |
| 1968 | 26 days |
| 1969 | 17 days |
| 1970 | 19 days |
| 1971 | 20 days |
| 1972 | 25 days |
| 1973 | 26 days |
| 1974 | 18 days |
| 1975 | 17 days |
| 1976 | 28 days |
| 1977 | 26 days |
| 1978 | 18 days |
| 1979 | 12 days |
| 1980 | 24 days |
| 1981 | 15 days |
| 1982 | 15 days |
| 1983 | 20 days |
| 1984 | 13 days |
| 1985 | 19 days |
| 1986 | 23 days |
| 1987 | 26 days |
| 1988 | 29 days |
| 1989 | 23 days |
| 1990 | 15 days |
| 1991 | 24 days |
| 1992 | 13 days |
| 1993 | 12 days |
| 1994 | 18 days |
| 1995 | 23 days |
| 1996 | 8 days |
| 1997 | 20 days |
| 1998 | 19 days |
| 1999 | 22 days |
| 2000 | 21 days |
| 2001 | 33 days |
| 2002 | 26 days |
| 2003 | 13 days |
| 2004 | 17 days |
| 2005 | 27 days |
| 2006 | 27 days |
| 2007 | 19 days |
| 2008 | 21 days |
| 2009 | 16 days |
| 2010 | 20 days |
| 2011 | 19 days |
| 2012 | 13 days |
| 2013 | 14 days |
| 2014 | 10 days |
| 2015 | 24 days |
| 2016 | 19 days |
| 2017 | 19 days |
| 2018 | 12 days |
| 2019 | 14 days |
| 2020 | 15 days |
| 2021 | 17 days |
| 2022 | 14 days |
| 2023 | 22 days |
| 2024 | 42 days |
| 2025 | 20 days |
| 2026 | 20 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
84 years with a frostAcross 84 years with a frost, the median last spring frost at Phila Intl AP falls on 4 April and the median first autumn frost on 7 November, which leaves a median of 218 days between them.
In 1996 to 2025 the median growing season was 226 days. That is 17 days more than in 1941 to 1971.
Fitted over all years, the growing season changes by +3.5 days per decade at this station.
| Measure | Median, all years | Earliest period (1941 to 1971) | Recent period (1996 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 4 April | 5 April | 29 March | 7 days earlier | -1.1 days per decade |
| First autumn frost | 7 November | 1 November | 12 November | 11 days later | +2.5 days per decade |
| Growing days | 218 days | 209 days | 226 days | 17 days more | +3.5 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
84 years, 1941 to 2025A day with at least 67.9 mm (2.7 in) of rain is expected about once in 2 years. A day with at least 189.5 mm (7.5 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 67.9 mm (2.7 in) | |
| 5 years | 93.6 mm (3.7 in) | |
| 10 years | 113.0 mm (4.4 in) | |
| 25 years | 140.8 mm (5.5 in) | |
| 50 years | 164.0 mm (6.5 in) | |
| 100 years | 189.5 mm (7.5 in) | Longer than the 84 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, 84 years of values from 1941 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: 203.7 mm (8.0 in) in 2013; 168.4 mm (6.6 in) in 1999; 140.5 mm (5.5 in) in 2005.
Station Changes
3 suspected3 changes were suspected in the annual mean temperature of Phila Intl AP, at 1956, 1991 and 1996. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1956 ran 0.3 C (0.6 F) lower than in the years before (possible change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1991 ran 0.7 C (1.2 F) higher than in the years before (likely change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1996 ran 0.4 C (0.7 F) lower than in the years before (possible change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1956 | -0.3 | -0.6 | possible | 5 |
| 1991 | +0.7 | +1.2 | likely | 5 |
| 1996 | -0.4 | -0.7 | possible | 5 |
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Climate Twins
2011 to 2025 against 1961 to 1990Over 2011 to 2025, Phila Intl AP had a mean temperature of 14.3 C (57.7 F) and 1,168.2 mm (46.0 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Baltimore Customs House (United States, 136 km away), Royal Oak 2 SSW (United States, 153 km away) and Vienna (United States, 162 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Baltimore Customs House | United States | 136 km (85 mi) | 14.5 C (58.1 F) | 1,085.7 mm (42.7 in) | 0.67 |
| Royal Oak 2 SSW | United States | 153 km (95 mi) | 13.8 C (56.8 F) | 1,119.9 mm (44.1 in) | 0.78 |
| Vienna | United States | 162 km (101 mi) | 13.9 C (57.0 F) | 1,095.2 mm (43.1 in) | 0.81 |
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
Download the Data
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 (2026-10-12).