Prompton Dam Weather Records (USC00367186)
Record envelope, standing records and threshold days for Prompton Dam (USC00367186), Pennsylvania, United States, with 59 years of record.
Key Facts for Prompton Dam
- Prompton Dam (USC00367186) is a weather station in Pennsylvania, United States at 41.59 latitude and -75.33 longitude, 375 m (1,230 ft) above sea level.
- The station reports from 1968 to 2026, 59 years of record.
- 1,464 records set at Prompton Dam still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- Prompton Dam set a daily record precipitation of 21.3 mm (0.8 in) on 14 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, 41.59 latitude, -75.33 longitude.
- Elevation: 375 m (1,230 ft).
- Period of record: 1968 to 2026, 59 years.
- Eligible elements: tmax, tmin, prcp.
Daily Record Envelope and 2026
3 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 16.7 C (62.1 F) | -29.4 C (-20.9 F) | 8.3 C (46.9 F) | -20.0 C (-4.0 F) |
| Feb | 22.2 C (72.0 F) | -27.8 C (-18.0 F) | 5.0 C (41.0 F) | -20.0 C (-4.0 F) |
| Mar | 31.1 C (88.0 F) | -22.2 C (-8.0 F) | 22.8 C (73.0 F) | -11.1 C (12.0 F) |
| Apr | 37.8 C (100.0 F) | -12.2 C (10.0 F) | 28.3 C (82.9 F) | -5.6 C (21.9 F) |
| May | 39.4 C (102.9 F) | -3.3 C (26.1 F) | 34.4 C (93.9 F) | 1.7 C (35.1 F) |
| Jun | 38.9 C (102.0 F) | -2.2 C (28.0 F) | 32.2 C (90.0 F) | 7.2 C (45.0 F) |
| Jul | 41.7 C (107.1 F) | 4.4 C (39.9 F) | 36.1 C (97.0 F) | 10.6 C (51.1 F) |
| Aug | 41.1 C (106.0 F) | 3.3 C (37.9 F) | 30.6 C (87.1 F) | 11.1 C (52.0 F) |
| Sep | 41.1 C (106.0 F) | -2.2 C (28.0 F) | 21.1 C (70.0 F) | 7.2 C (45.0 F) |
| Oct | 31.1 C (88.0 F) | -7.8 C (18.0 F) | 24.4 C (75.9 F) | 14.4 C (57.9 F) |
| Nov | 28.9 C (84.0 F) | -16.7 C (1.9 F) | n/a | n/a |
| Dec | 20.0 C (68.0 F) | -21.7 C (-7.1 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1968 | 37 |
| 1969 | 36 |
| 1970 | 7 |
| 1971 | 64 |
| 1972 | 60 |
| 1973 | 81 |
| 1974 | 54 |
| 1975 | 47 |
| 1976 | 61 |
| 1977 | 43 |
| 1978 | 40 |
| 1979 | 66 |
| 1980 | 45 |
| 1981 | 44 |
| 1982 | 27 |
| 1983 | 37 |
| 1984 | 37 |
| 1985 | 34 |
| 1986 | 45 |
| 1987 | 7 |
| 1988 | 16 |
| 2011 | 50 |
| 2012 | 41 |
| 2013 | 37 |
| 2014 | 50 |
| 2015 | 52 |
| 2016 | 31 |
| 2017 | 34 |
| 2018 | 36 |
| 2019 | 24 |
| 2020 | 30 |
| 2021 | 32 |
| 2022 | 20 |
| 2023 | 35 |
| 2024 | 41 |
| 2025 | 38 |
| 2026 | 25 |
Wettest Day of Each Month
Oct: 179.1 mm (7.1 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 59.2 mm (2.3 in) | 22 January 1979 |
| Feb | 47.0 mm (1.9 in) | 24 February 1975 |
| Mar | 50.8 mm (2.0 in) | 14 March 1977 |
| Apr | 69.9 mm (2.8 in) | 15 April 2019 |
| May | 104.6 mm (4.1 in) | 5 May 2021 |
| Jun | 106.7 mm (4.2 in) | 28 June 2013 |
| Jul | 89.9 mm (3.5 in) | 2 July 1984 |
| Aug | 88.1 mm (3.5 in) | 5 August 2020 |
| Sep | 93.5 mm (3.7 in) | 27 September 1985 |
| Oct | 179.1 mm (7.1 in) | 1 October 2010 |
| Nov | 80.3 mm (3.2 in) | 9 November 1972 |
| Dec | 139.7 mm (5.5 in) | 27 December 1984 |
Period of Record Coverage
1968 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1968 | 191 | 52% | No |
| 1969 | 184 | 50% | No |
| 1970 | 37 | 10% | No |
| 1971 | 290 | 79% | No |
| 1972 | 293 | 80% | No |
| 1973 | 295 | 81% | No |
| 1974 | 274 | 75% | No |
| 1975 | 279 | 76% | No |
| 1976 | 217 | 59% | No |
| 1977 | 203 | 56% | No |
| 1978 | 252 | 69% | No |
| 1979 | 279 | 76% | No |
| 1980 | 276 | 75% | No |
| 1981 | 245 | 67% | No |
| 1982 | 211 | 58% | No |
| 1983 | 240 | 66% | No |
| 1984 | 214 | 58% | No |
| 1985 | 204 | 56% | No |
| 1986 | 227 | 62% | No |
| 1987 | 71 | 19% | No |
| 1988 | 50 | 14% | No |
| 2011 | 365 | 100% | Yes |
| 2012 | 248 | 68% | No |
| 2013 | 243 | 67% | No |
| 2014 | 248 | 68% | No |
| 2015 | 251 | 69% | No |
| 2016 | 250 | 68% | No |
| 2017 | 250 | 68% | No |
| 2018 | 242 | 66% | No |
| 2019 | 240 | 66% | No |
| 2020 | 247 | 67% | No |
| 2021 | 242 | 66% | No |
| 2022 | 246 | 67% | No |
| 2023 | 242 | 66% | No |
| 2024 | 252 | 69% | No |
| 2025 | 246 | 67% | No |
| 2026 | 169 | 46% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 14 September 2026 | Prompton Dam, US | daily rain (Provisional) | 21.3 mm (0.8 in) | 11.1 mm (0.4 in) | 55 years | 20 of 100 (Routine) |
| 31 August 2026 | Prompton Dam, US | daily low max (Provisional) | 20.6 C (69.1 F) | 0.5 C (0.9 F) | 49 years | 20 of 100 (Routine) |
| 20 August 2026 | Prompton Dam, US | daily low max (Provisional) | 21.1 C (70.0 F) | 1.7 C (3.1 F) | 1 year | 8 of 100 (Routine) |
| 7 August 2026 | Prompton Dam, US | daily high min | 21.7 C (71.1 F) | 1.7 C (3.1 F) | 8 years | 11 of 100 (Routine) |
| 3 August 2026 | Prompton Dam, US | daily high min | 21.7 C (71.1 F) | 1.1 C (2.0 F) | 8 years | 10 of 100 (Routine) |
| 28 July 2026 | Prompton Dam, US | daily low max | 22.2 C (72.0 F) | 1.7 C (3.1 F) | 56 years | 26 of 100 (Routine) |
| 21 July 2026 | Prompton Dam, US | daily low max (Tie) | 24.4 C (75.9 F) | tie | 52 years | 5 of 100 (Routine) |
| 20 July 2026 | Prompton Dam, US | daily low min | 10.6 C (51.1 F) | 0.5 C (0.9 F) | 55 years | 22 of 100 (Routine) |
| 22 June 2026 | Prompton Dam, US | daily low max | 17.2 C (63.0 F) | 3.9 C (7.0 F) | 53 years | 28 of 100 (Routine) |
| 12 June 2026 | Prompton Dam, US | daily high min | 22.8 C (73.0 F) | 2.8 C (5.0 F) | 52 years | 27 of 100 (Routine) |
| 12 June 2026 | Prompton Dam, US | daily rain | 22.1 mm (0.9 in) | 6.9 mm (0.27 in) | 51 years | 20 of 100 (Routine) |
| 1 June 2026 | Prompton Dam, US | daily low max | 20.0 C (68.0 F) | 0.6 C (1.1 F) | 4 years | 7 of 100 (Routine) |
| 22 May 2026 | Prompton Dam, US | daily high min | 17.2 C (63.0 F) | 1.6 C (2.9 F) | 13 years | 12 of 100 (Routine) |
| 20 May 2026 | Prompton Dam, US | monthly high min | 20.6 C (69.1 F) | 1.2 C (2.2 F) | 0 years | 17 of 100 (Routine) |
| 19 May 2026 | Prompton Dam, US | monthly high min | 19.4 C (66.9 F) | 0.5 C (0.9 F) | 10 years | 19 of 100 (Routine) |
| 18 May 2026 | Prompton Dam, US | daily high max | 34.4 C (93.9 F) | 1.1 C (2.0 F) | 52 years | 21 of 100 (Routine) |
| 6 May 2026 | Prompton Dam, US | daily high min (Tie) | 15.6 C (60.1 F) | tie | 40 years | 4 of 100 (Routine) |
| 17 April 2026 | Prompton Dam, US | monthly high min | 16.1 C (61.0 F) | 0.5 C (0.9 F) | 0 years | 16 of 100 (Routine) |
| 16 April 2026 | Prompton Dam, US | monthly high min | 15.6 C (60.1 F) | 0.6 C (1.1 F) | 12 years | 19 of 100 (Routine) |
| 1 April 2026 | Prompton Dam, US | daily high min | 14.4 C (57.9 F) | 6.1 C (11.0 F) | 9 years | 21 of 100 (Routine) |
Extremes by Year
1968 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 41.7 C (107.1 F) | 1973 | 35.6 C (96.1 F) | 37 |
| Coldest night (TNn) | -29.4 C (-20.9 F) | 1976 | -22.8 C (-9.0 F) | 37 |
| Wettest day (Rx1day) | 179.1 mm (7.1 in) | 2010 | 57.2 mm (2.3 in) | 40 |
| Wettest five days (Rx5day) | 216.9 mm (8.5 in) | 2010 | 71.3 mm (2.8 in) | 38 |
| Longest dry spell (CDD) | 26 days | 1968 | 6 days | 40 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1968 | 38.9 C (102.0 F) |
| 1969 | 38.9 C (102.0 F) |
| 1970 | 30.0 C (86.0 F) |
| 1971 | 39.4 C (102.9 F) |
| 1972 | 37.8 C (100.0 F) |
| 1973 | 41.7 C (107.1 F) |
| 1974 | 37.8 C (100.0 F) |
| 1975 | 41.1 C (106.0 F) |
| 1976 | 37.8 C (100.0 F) |
| 1977 | 40.0 C (104.0 F) |
| 1978 | 38.9 C (102.0 F) |
| 1979 | 40.6 C (105.1 F) |
| 1980 | 40.0 C (104.0 F) |
| 1981 | 38.3 C (100.9 F) |
| 1982 | 40.0 C (104.0 F) |
| 1983 | 37.2 C (99.0 F) |
| 1984 | 36.7 C (98.1 F) |
| 1985 | 32.2 C (90.0 F) |
| 1986 | 33.3 C (91.9 F) |
| 1987 | 27.8 C (82.0 F) |
| 1988 | 22.2 C (72.0 F) |
| 2008 | n/a |
| 2009 | n/a |
| 2010 | n/a |
| 2011 | 34.4 C (93.9 F) |
| 2012 | 35.6 C (96.1 F) |
| 2013 | 34.4 C (93.9 F) |
| 2014 | 31.7 C (89.1 F) |
| 2015 | 34.4 C (93.9 F) |
| 2016 | 34.4 C (93.9 F) |
| 2017 | 32.8 C (91.0 F) |
| 2018 | 36.1 C (97.0 F) |
| 2019 | 33.3 C (91.9 F) |
| 2020 | 34.4 C (93.9 F) |
| 2021 | 34.4 C (93.9 F) |
| 2022 | 35.0 C (95.0 F) |
| 2023 | 33.3 C (91.9 F) |
| 2024 | 33.9 C (93.0 F) |
| 2025 | 35.6 C (96.1 F) |
| 2026 | 36.1 C (97.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1968 | -13.3 C (8.1 F) |
| 1969 | -17.8 C (0.0 F) |
| 1970 | -16.7 C (1.9 F) |
| 1971 | -27.8 C (-18.0 F) |
| 1972 | -23.3 C (-9.9 F) |
| 1973 | -22.8 C (-9.0 F) |
| 1974 | -22.2 C (-8.0 F) |
| 1975 | -23.3 C (-9.9 F) |
| 1976 | -29.4 C (-20.9 F) |
| 1977 | -26.1 C (-15.0 F) |
| 1978 | -24.4 C (-11.9 F) |
| 1979 | -24.4 C (-11.9 F) |
| 1980 | -21.1 C (-6.0 F) |
| 1981 | -29.4 C (-20.9 F) |
| 1982 | -22.2 C (-8.0 F) |
| 1983 | -22.8 C (-9.0 F) |
| 1984 | -23.3 C (-9.9 F) |
| 1985 | -25.6 C (-14.1 F) |
| 1986 | -21.1 C (-6.0 F) |
| 1987 | -27.8 C (-18.0 F) |
| 1988 | -27.8 C (-18.0 F) |
| 2008 | n/a |
| 2009 | n/a |
| 2010 | n/a |
| 2011 | -27.2 C (-17.0 F) |
| 2012 | -20.6 C (-5.1 F) |
| 2013 | -21.7 C (-7.1 F) |
| 2014 | -23.9 C (-11.0 F) |
| 2015 | -26.1 C (-15.0 F) |
| 2016 | -17.8 C (0.0 F) |
| 2017 | -16.7 C (1.9 F) |
| 2018 | -22.2 C (-8.0 F) |
| 2019 | -22.8 C (-9.0 F) |
| 2020 | -16.1 C (3.0 F) |
| 2021 | -16.1 C (3.0 F) |
| 2022 | -24.4 C (-11.9 F) |
| 2023 | -22.8 C (-9.0 F) |
| 2024 | -21.7 C (-7.1 F) |
| 2025 | -25.0 C (-13.0 F) |
| 2026 | -20.0 C (-4.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1968 | 82.6 mm (3.3 in) |
| 1969 | 53.1 mm (2.1 in) |
| 1970 | 34.8 mm (1.4 in) |
| 1971 | 63.2 mm (2.5 in) |
| 1972 | 80.3 mm (3.2 in) |
| 1973 | 101.6 mm (4.0 in) |
| 1974 | 55.9 mm (2.2 in) |
| 1975 | 89.4 mm (3.5 in) |
| 1976 | 50.8 mm (2.0 in) |
| 1977 | 50.8 mm (2.0 in) |
| 1978 | 48.3 mm (1.9 in) |
| 1979 | 59.2 mm (2.3 in) |
| 1980 | 49.5 mm (1.9 in) |
| 1981 | 35.6 mm (1.4 in) |
| 1982 | 35.6 mm (1.4 in) |
| 1983 | 66.0 mm (2.6 in) |
| 1984 | 139.7 mm (5.5 in) |
| 1985 | 93.5 mm (3.7 in) |
| 1986 | 43.2 mm (1.7 in) |
| 1987 | 28.7 mm (1.1 in) |
| 1988 | 49.0 mm (1.9 in) |
| 2008 | 49.5 mm (1.9 in) |
| 2009 | 62.7 mm (2.5 in) |
| 2010 | 179.1 mm (7.1 in) |
| 2011 | 81.3 mm (3.2 in) |
| 2012 | 55.9 mm (2.2 in) |
| 2013 | 106.7 mm (4.2 in) |
| 2014 | 61.0 mm (2.4 in) |
| 2015 | 64.8 mm (2.6 in) |
| 2016 | 45.7 mm (1.8 in) |
| 2017 | 47.0 mm (1.9 in) |
| 2018 | 53.3 mm (2.1 in) |
| 2019 | 69.9 mm (2.8 in) |
| 2020 | 88.1 mm (3.5 in) |
| 2021 | 104.6 mm (4.1 in) |
| 2022 | 58.4 mm (2.3 in) |
| 2023 | 46.2 mm (1.8 in) |
| 2024 | 63.5 mm (2.5 in) |
| 2025 | 43.7 mm (1.7 in) |
| 2026 | 40.6 mm (1.6 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1968 | 122.5 mm (4.8 in) |
| 1969 | 142.5 mm (5.6 in) |
| 1970 | 52.5 mm (2.1 in) |
| 1971 | 138.0 mm (5.4 in) |
| 1972 | 117.6 mm (4.6 in) |
| 1973 | 122.7 mm (4.8 in) |
| 1974 | 87.3 mm (3.4 in) |
| 1975 | 118.4 mm (4.7 in) |
| 1976 | 72.4 mm (2.9 in) |
| 1977 | 80.3 mm (3.2 in) |
| 1978 | 54.7 mm (2.2 in) |
| 1979 | 98.9 mm (3.9 in) |
| 1980 | 51.0 mm (2.0 in) |
| 1981 | 58.9 mm (2.3 in) |
| 1982 | 50.8 mm (2.0 in) |
| 1983 | 104.2 mm (4.1 in) |
| 1984 | 66.5 mm (2.6 in) |
| 1985 | 97.1 mm (3.8 in) |
| 1986 | 47.7 mm (1.9 in) |
| 1987 | 36.6 mm (1.4 in) |
| 1988 | 40.2 mm (1.6 in) |
| 2008 | 72.4 mm (2.9 in) |
| 2009 | 112.6 mm (4.4 in) |
| 2010 | 216.9 mm (8.5 in) |
| 2011 | 152.2 mm (6.0 in) |
| 2012 | 47.7 mm (1.9 in) |
| 2013 | 117.1 mm (4.6 in) |
| 2014 | 8.9 mm (0.35 in) |
| 2015 | 19.6 mm (0.8 in) |
| 2016 | n/a |
| 2017 | 38.6 mm (1.5 in) |
| 2018 | 118.1 mm (4.6 in) |
| 2019 | 70.2 mm (2.8 in) |
| 2020 | 64.0 mm (2.5 in) |
| 2021 | 31.0 mm (1.2 in) |
| 2022 | n/a |
| 2023 | 11.7 mm (0.5 in) |
| 2024 | 106.2 mm (4.2 in) |
| 2025 | 8.6 mm (0.34 in) |
| 2026 | 6.0 mm (0.24 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1968 | 26 days |
| 1969 | 21 days |
| 1970 | 8 days |
| 1971 | 16 days |
| 1972 | 16 days |
| 1973 | 15 days |
| 1974 | 15 days |
| 1975 | 19 days |
| 1976 | 16 days |
| 1977 | 17 days |
| 1978 | 12 days |
| 1979 | 14 days |
| 1980 | 11 days |
| 1981 | 14 days |
| 1982 | 10 days |
| 1983 | 5 days |
| 1984 | 5 days |
| 1985 | 5 days |
| 1986 | 5 days |
| 1987 | 5 days |
| 1988 | 4 days |
| 2008 | 6 days |
| 2009 | 9 days |
| 2010 | 12 days |
| 2011 | 10 days |
| 2012 | 5 days |
| 2013 | 5 days |
| 2014 | 4 days |
| 2015 | 5 days |
| 2016 | 4 days |
| 2017 | 9 days |
| 2018 | 5 days |
| 2019 | 5 days |
| 2020 | 4 days |
| 2021 | 4 days |
| 2022 | 4 days |
| 2023 | 4 days |
| 2024 | 5 days |
| 2025 | 4 days |
| 2026 | 5 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.
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 2026-10-12 (12 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-13).