Slippery Rock 1 SSW Weather Records (USC00368184)
Record envelope, standing records and threshold days for Slippery Rock 1 SSW (USC00368184), Pennsylvania, United States, with 78 years of record.
Key Facts for Slippery Rock 1 SSW
- Slippery Rock 1 SSW (USC00368184) is a weather station in Pennsylvania, United States at 41.06 latitude and -80.06 longitude, 384 m (1,260 ft) above sea level.
- The station reports from 1949 to 2026, 78 years of record.
- 1,464 records set at Slippery Rock 1 SSW still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Slippery Rock 1 SSW tied a daily record high minimum temperature of 16.7 C (62.1 F) on 2 October 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, 41.06 latitude, -80.06 longitude.
- Elevation: 384 m (1,260 ft).
- Period of record: 1949 to 2026, 78 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
8 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 22.2 C (72.0 F) | -33.3 C (-27.9 F) | 17.2 C (63.0 F) | -31.1 C (-24.0 F) |
| Feb | 23.3 C (73.9 F) | -29.4 C (-20.9 F) | 15.6 C (60.1 F) | -27.8 C (-18.0 F) |
| Mar | 30.6 C (87.1 F) | -23.3 C (-9.9 F) | 25.0 C (77.0 F) | -12.2 C (10.0 F) |
| Apr | 31.7 C (89.1 F) | -12.8 C (9.0 F) | 27.2 C (81.0 F) | -6.1 C (21.0 F) |
| May | 35.6 C (96.1 F) | -5.6 C (21.9 F) | 30.6 C (87.1 F) | -2.8 C (27.0 F) |
| Jun | 37.2 C (99.0 F) | -1.1 C (30.0 F) | 31.7 C (89.1 F) | 3.3 C (37.9 F) |
| Jul | 38.9 C (102.0 F) | 2.8 C (37.0 F) | 34.4 C (93.9 F) | 8.9 C (48.0 F) |
| Aug | 37.2 C (99.0 F) | -2.2 C (28.0 F) | 28.9 C (84.0 F) | 10.0 C (50.0 F) |
| Sep | 37.2 C (99.0 F) | -2.8 C (27.0 F) | 32.8 C (91.0 F) | 5.0 C (41.0 F) |
| Oct | 32.8 C (91.0 F) | -11.1 C (12.0 F) | 27.2 C (81.0 F) | 0.6 C (33.1 F) |
| Nov | 27.2 C (81.0 F) | -18.3 C (-0.9 F) | n/a | n/a |
| Dec | 23.3 C (73.9 F) | -28.9 C (-20.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1949 | 17 |
| 1950 | 27 |
| 1951 | 16 |
| 1952 | 29 |
| 1953 | 22 |
| 1954 | 24 |
| 1955 | 25 |
| 1956 | 12 |
| 1957 | 15 |
| 1958 | 20 |
| 1959 | 28 |
| 1960 | 18 |
| 1961 | 20 |
| 1962 | 23 |
| 1963 | 30 |
| 1964 | 26 |
| 1965 | 20 |
| 1966 | 23 |
| 1967 | 22 |
| 1968 | 15 |
| 1969 | 13 |
| 1970 | 15 |
| 1971 | 21 |
| 1972 | 22 |
| 1973 | 11 |
| 1974 | 28 |
| 1975 | 26 |
| 1976 | 33 |
| 1977 | 34 |
| 1978 | 18 |
| 1979 | 47 |
| 1980 | 14 |
| 1981 | 18 |
| 1982 | 29 |
| 1983 | 16 |
| 1984 | 26 |
| 1985 | 20 |
| 1986 | 20 |
| 1987 | 16 |
| 1988 | 28 |
| 1989 | 21 |
| 1990 | 23 |
| 1991 | 18 |
| 1992 | 18 |
| 1993 | 22 |
| 1994 | 22 |
| 1995 | 13 |
| 1996 | 15 |
| 1997 | 12 |
| 1998 | 18 |
| 1999 | 12 |
| 2000 | 12 |
| 2001 | 15 |
| 2002 | 24 |
| 2003 | 4 |
| 2004 | 6 |
| 2005 | 10 |
| 2006 | 15 |
| 2007 | 19 |
| 2008 | 9 |
| 2009 | 8 |
| 2010 | 22 |
| 2011 | 14 |
| 2012 | 28 |
| 2013 | 8 |
| 2014 | 10 |
| 2015 | 31 |
| 2016 | 22 |
| 2017 | 17 |
| 2018 | 23 |
| 2019 | 10 |
| 2020 | 6 |
| 2021 | 6 |
| 2022 | 11 |
| 2023 | 11 |
| 2024 | 10 |
| 2025 | 16 |
| 2026 | 16 |
All-Time Record Progression
10 new records| Date | Kind | Detail |
|---|---|---|
| 1979-02-11 | Record low minimum temperature | Record low minimum temperature -29.4 C (-20.9 F) |
| 1983-12-24 | Record low maximum temperature | Record low maximum temperature -20.0 C (-4.0 F) |
| 1984-01-20 | Record low minimum temperature | Record low minimum temperature -30.0 C (-22.0 F) |
| 1985-01-20 | Record low maximum temperature | Record low maximum temperature -23.3 C (-9.9 F) |
| 1988-07-07 | Record high maximum temperature | Record high maximum temperature 37.8 C (100.0 F) |
| 1988-07-16 | Record high maximum temperature | Record high maximum temperature 38.9 C (102.0 F) |
| 1994-01-18 | Record low minimum temperature | Record low minimum temperature -33.3 C (-27.9 F) |
| 2004-09-08 | Record daily precipitation | Record daily precipitation 119.6 mm (4.7 in) |
| 2026-07-12 | Record high minimum temperature | Record high minimum temperature 23.9 C (75.0 F) |
| 2026-07-16 | Record high minimum temperature | Record high minimum temperature 24.4 C (75.9 F) |
Wettest Day of Each Month
Sep: 119.6 mm (4.7 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 41.9 mm (1.6 in) | 24 January 2010 |
| Feb | 38.6 mm (1.5 in) | 25 February 2022 |
| Mar | 64.8 mm (2.6 in) | 28 March 1985 |
| Apr | 51.1 mm (2.0 in) | 25 April 1993 |
| May | 51.3 mm (2.0 in) | 22 May 2025 |
| Jun | 70.9 mm (2.8 in) | 15 June 2015 |
| Jul | 100.1 mm (3.9 in) | 6 July 2026 |
| Aug | 87.6 mm (3.4 in) | 15 August 1980 |
| Sep | 119.6 mm (4.7 in) | 8 September 2004 |
| Oct | 97.8 mm (3.9 in) | 16 October 1954 |
| Nov | 78.0 mm (3.1 in) | 30 November 2010 |
| Dec | 57.7 mm (2.3 in) | 2 December 1991 |
Period of Record Coverage
1949 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1949 | 245 | 67% | No |
| 1950 | 334 | 92% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 364 | 100% | Yes |
| 1954 | 364 | 100% | Yes |
| 1955 | 364 | 100% | Yes |
| 1956 | 365 | 100% | Yes |
| 1957 | 365 | 100% | Yes |
| 1958 | 364 | 100% | Yes |
| 1959 | 364 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 362 | 99% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 362 | 99% | Yes |
| 1964 | 363 | 99% | Yes |
| 1965 | 363 | 99% | Yes |
| 1966 | 364 | 100% | Yes |
| 1967 | 348 | 95% | Yes |
| 1968 | 351 | 96% | Yes |
| 1969 | 363 | 99% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 359 | 98% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 364 | 100% | Yes |
| 1979 | 364 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 364 | 100% | Yes |
| 1982 | 358 | 98% | Yes |
| 1983 | 358 | 98% | Yes |
| 1984 | 334 | 91% | Yes |
| 1985 | 364 | 100% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 364 | 100% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 365 | 100% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 363 | 99% | Yes |
| 1992 | 364 | 99% | Yes |
| 1993 | 364 | 100% | Yes |
| 1994 | 363 | 99% | Yes |
| 1995 | 362 | 99% | Yes |
| 1996 | 365 | 100% | Yes |
| 1997 | 361 | 99% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 364 | 100% | Yes |
| 2000 | 366 | 100% | Yes |
| 2001 | 365 | 100% | Yes |
| 2002 | 363 | 99% | Yes |
| 2003 | 365 | 100% | Yes |
| 2004 | 364 | 99% | Yes |
| 2005 | 365 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 362 | 99% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 336 | 92% | Yes |
| 2012 | 356 | 97% | Yes |
| 2013 | 363 | 99% | Yes |
| 2014 | 334 | 92% | Yes |
| 2015 | 300 | 82% | No |
| 2016 | 364 | 99% | Yes |
| 2017 | 362 | 99% | Yes |
| 2018 | 362 | 99% | Yes |
| 2019 | 364 | 100% | Yes |
| 2020 | 320 | 87% | No |
| 2021 | 346 | 95% | Yes |
| 2022 | 317 | 87% | No |
| 2023 | 361 | 99% | Yes |
| 2024 | 311 | 85% | No |
| 2025 | 351 | 96% | Yes |
| 2026 | 278 | 76% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 2 October 2026 | Slippery Rock 1 SSW, US | daily high min (Tie, Provisional) | 16.7 C (62.1 F) | tie | 7 years | 2 of 100 (Routine) |
| 18 September 2026 | Slippery Rock 1 SSW, US | daily high min (Provisional) | 20.0 C (68.0 F) | 2.2 C (4.0 F) | 60 years | 29 of 100 (Routine) |
| 13 September 2026 | Slippery Rock 1 SSW, US | daily rain (Provisional) | 47.2 mm (1.9 in) | 15.2 mm (0.6 in) | 63 years | 37 of 100 (Notable) |
| 13 September 2026 | Slippery Rock 1 SSW, US | daily high min (Provisional) | 20.0 C (68.0 F) | 0.6 C (1.1 F) | 64 years | 27 of 100 (Routine) |
| 4 September 2026 | Slippery Rock 1 SSW, US | daily rain (Provisional) | 55.9 mm (2.2 in) | 35.1 mm (1.4 in) | 35 years | 45 of 100 (Notable) |
| 23 July 2026 | Slippery Rock 1 SSW, US | daily low max | 20.0 C (68.0 F) | 2.2 C (4.0 F) | 7 years | 15 of 100 (Routine) |
| 16 July 2026 | Slippery Rock 1 SSW, US | all-time high min | 24.4 C (75.9 F) | 0.5 C (0.9 F) | 0 years | 28 of 100 (Routine) |
| 12 July 2026 | Slippery Rock 1 SSW, US | all-time high min | 23.9 C (75.0 F) | 1.1 C (2.0 F) | 74 years | 51 of 100 (Notable) |
| 11 July 2026 | Slippery Rock 1 SSW, US | daily high min (Tie) | 20.6 C (69.1 F) | tie | 59 years | 6 of 100 (Routine) |
| 6 July 2026 | Slippery Rock 1 SSW, US | monthly rain | 100.1 mm (3.9 in) | 11.2 mm (0.4 in) | 52 years | 41 of 100 (Notable) |
| 4 July 2026 | Slippery Rock 1 SSW, US | daily high max (Tie) | 34.4 C (93.9 F) | tie | 76 years | 7 of 100 (Routine) |
| 3 July 2026 | Slippery Rock 1 SSW, US | daily high min (Tie) | 20.0 C (68.0 F) | tie | 61 years | 6 of 100 (Routine) |
| 2 July 2026 | Slippery Rock 1 SSW, US | daily high min (Tie) | 21.1 C (70.0 F) | tie | 69 years | 6 of 100 (Routine) |
| 8 June 2026 | Slippery Rock 1 SSW, US | daily high min (Tie) | 22.2 C (72.0 F) | tie | 11 years | 2 of 100 (Routine) |
| 25 May 2026 | Slippery Rock 1 SSW, US | daily rain | 29.7 mm (1.2 in) | 6.3 mm (0.25 in) | 47 years | 28 of 100 (Routine) |
| 2 May 2026 | Slippery Rock 1 SSW, US | daily low max | 6.7 C (44.1 F) | 1.1 C (2.0 F) | 48 years | 22 of 100 (Routine) |
| 16 April 2026 | Slippery Rock 1 SSW, US | daily high min (Tie) | 12.8 C (55.0 F) | tie | 13 years | 2 of 100 (Routine) |
| 5 April 2026 | Slippery Rock 1 SSW, US | daily high min (Tie) | 11.1 C (52.0 F) | tie | 40 years | 4 of 100 (Routine) |
| 4 April 2026 | Slippery Rock 1 SSW, US | daily high min | 15.0 C (59.0 F) | 4.4 C (7.9 F) | 76 years | 37 of 100 (Notable) |
| 4 April 2026 | Slippery Rock 1 SSW, US | daily high max (Tie) | 25.0 C (77.0 F) | tie | 44 years | 5 of 100 (Routine) |
Climate Trend
67 complete years, 1951 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1951 | 8.9 C | -0.39 C |
| 1952 | 10.0 C | +0.71 C |
| 1953 | 11.1 C | +1.80 C |
| 1954 | 10.3 C | +1.00 C |
| 1955 | 10.5 C | +1.18 C |
| 1956 | 9.8 C | +0.48 C |
| 1957 | 10.3 C | +0.95 C |
| 1958 | 8.9 C | -0.42 C |
| 1959 | 10.9 C | +1.57 C |
| 1960 | 9.6 C | +0.23 C |
| 1961 | 10.2 C | +0.89 C |
| 1962 | 9.6 C | +0.31 C |
| 1963 | 9.1 C | -0.25 C |
| 1964 | 10.4 C | +1.02 C |
| 1965 | 9.8 C | +0.43 C |
| 1966 | 9.4 C | +0.06 C |
| 1969 | 8.3 C | -1.08 C |
| 1970 | 8.8 C | -0.49 C |
| 1971 | 8.7 C | -0.65 C |
| 1972 | 8.2 C | -1.12 C |
| 1973 | 9.7 C | +0.41 C |
| 1974 | 8.0 C | -1.29 C |
| 1975 | 8.3 C | -1.06 C |
| 1976 | 7.6 C | -1.78 C |
| 1977 | 8.3 C | -1.06 C |
| 1978 | 7.1 C | -2.22 C |
| 1979 | 7.5 C | -1.80 C |
| 1980 | 7.5 C | -1.81 C |
| 1981 | 7.8 C | -1.54 C |
| 1982 | 8.2 C | -1.16 C |
| 1983 | 8.7 C | -0.64 C |
| 1985 | 8.0 C | -1.36 C |
| 1986 | 9.0 C | -0.33 C |
| 1987 | 9.0 C | -0.32 C |
| 1988 | 8.2 C | -1.14 C |
| 1989 | 7.9 C | -1.44 C |
| 1990 | 9.7 C | +0.32 C |
| 1991 | 9.6 C | +0.27 C |
| 1992 | 7.9 C | -1.40 C |
| 1993 | 8.1 C | -1.28 C |
| 1994 | 7.7 C | -1.63 C |
| 1995 | 8.7 C | -0.64 C |
| 1996 | 8.6 C | -0.77 C |
| 1997 | 8.7 C | -0.61 C |
| 1998 | 10.9 C | +1.54 C |
| 1999 | 9.9 C | +0.60 C |
| 2000 | 9.4 C | +0.10 C |
| 2001 | 10.4 C | +1.05 C |
| 2002 | 10.6 C | +1.22 C |
| 2003 | 9.3 C | -0.02 C |
| 2004 | 9.9 C | +0.59 C |
| 2005 | 10.3 C | +0.93 C |
| 2006 | 10.9 C | +1.56 C |
| 2007 | 10.5 C | +1.18 C |
| 2008 | 9.5 C | +0.17 C |
| 2009 | 9.5 C | +0.17 C |
| 2010 | 10.5 C | +1.12 C |
| 2011 | 10.8 C | +1.50 C |
| 2012 | 11.6 C | +2.24 C |
| 2013 | 9.9 C | +0.60 C |
| 2015 | 10.6 C | +1.23 C |
| 2016 | 10.0 C | +0.67 C |
| 2017 | 9.9 C | +0.54 C |
| 2018 | 9.3 C | -0.01 C |
| 2019 | 9.3 C | -0.03 C |
| 2023 | 10.6 C | +1.29 C |
| 2025 | 9.1 C | -0.26 C |
The fitted trend in annual mean temperature here over 1951 to 2025 is 0.08 C (-0.04 to 0.21) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.1 to 0.4) per decade. The slope is a straight line fitted to 67 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.08 C (-0.04 to 0.21) per decade | 0.1 F (-0.1 to 0.4) per decade | 1951 to 2025 | 67 | Not clearly different from zero |
| Mean daily maximum | 0.16 C (0.05 to 0.27) per decade | 0.3 F (0.1 to 0.5) per decade | 1951 to 2025 | 67 | Rise |
| Mean daily minimum | 0.00 C (-0.15 to 0.16) per decade | 0.01 F (-0.28 to 0.29) per decade | 1951 to 2025 | 67 | Not 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
1949 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 38.9 C (102.0 F) | 1988 | 33.3 C (91.9 F) | 78 |
| Coldest night (TNn) | -33.3 C (-27.9 F) | 1994 | -23.3 C (-9.9 F) | 78 |
| Wettest day (Rx1day) | 119.6 mm (4.7 in) | 2004 | 51.7 mm (2.0 in) | 78 |
| Wettest five days (Rx5day) | 156.3 mm (6.2 in) | 1956 | 83.6 mm (3.3 in) | 78 |
| Longest dry spell (CDD) | 27 days | 1963 | 14 days | 78 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1949 | 35.6 C (96.1 F) |
| 1950 | 32.8 C (91.0 F) |
| 1951 | 32.8 C (91.0 F) |
| 1952 | 37.2 C (99.0 F) |
| 1953 | 37.2 C (99.0 F) |
| 1954 | 35.6 C (96.1 F) |
| 1955 | 36.7 C (98.1 F) |
| 1956 | 33.9 C (93.0 F) |
| 1957 | 33.3 C (91.9 F) |
| 1958 | 31.7 C (89.1 F) |
| 1959 | 33.9 C (93.0 F) |
| 1960 | 34.4 C (93.9 F) |
| 1961 | 33.3 C (91.9 F) |
| 1962 | 33.3 C (91.9 F) |
| 1963 | 32.2 C (90.0 F) |
| 1964 | 33.3 C (91.9 F) |
| 1965 | 34.4 C (93.9 F) |
| 1966 | 36.7 C (98.1 F) |
| 1967 | 33.3 C (91.9 F) |
| 1968 | 32.8 C (91.0 F) |
| 1969 | 32.8 C (91.0 F) |
| 1970 | 32.2 C (90.0 F) |
| 1971 | 34.4 C (93.9 F) |
| 1972 | 32.8 C (91.0 F) |
| 1973 | 33.3 C (91.9 F) |
| 1974 | 31.1 C (88.0 F) |
| 1975 | 34.4 C (93.9 F) |
| 1976 | 31.1 C (88.0 F) |
| 1977 | 33.3 C (91.9 F) |
| 1978 | 32.8 C (91.0 F) |
| 1979 | 33.3 C (91.9 F) |
| 1980 | 33.3 C (91.9 F) |
| 1981 | 32.2 C (90.0 F) |
| 1982 | 32.8 C (91.0 F) |
| 1983 | 33.3 C (91.9 F) |
| 1984 | 31.7 C (89.1 F) |
| 1985 | 32.2 C (90.0 F) |
| 1986 | 32.8 C (91.0 F) |
| 1987 | 33.3 C (91.9 F) |
| 1988 | 38.9 C (102.0 F) |
| 1989 | 33.9 C (93.0 F) |
| 1990 | 32.2 C (90.0 F) |
| 1991 | 36.1 C (97.0 F) |
| 1992 | 32.2 C (90.0 F) |
| 1993 | 35.6 C (96.1 F) |
| 1994 | 35.0 C (95.0 F) |
| 1995 | 37.8 C (100.0 F) |
| 1996 | 32.8 C (91.0 F) |
| 1997 | 33.3 C (91.9 F) |
| 1998 | 33.9 C (93.0 F) |
| 1999 | 35.0 C (95.0 F) |
| 2000 | 32.2 C (90.0 F) |
| 2001 | 36.1 C (97.0 F) |
| 2002 | 34.4 C (93.9 F) |
| 2003 | 32.2 C (90.0 F) |
| 2004 | 31.7 C (89.1 F) |
| 2005 | 34.4 C (93.9 F) |
| 2006 | 33.9 C (93.0 F) |
| 2007 | 34.4 C (93.9 F) |
| 2008 | 32.8 C (91.0 F) |
| 2009 | 33.3 C (91.9 F) |
| 2010 | 35.6 C (96.1 F) |
| 2011 | 38.9 C (102.0 F) |
| 2012 | 38.3 C (100.9 F) |
| 2013 | 34.4 C (93.9 F) |
| 2014 | 35.6 C (96.1 F) |
| 2015 | 36.1 C (97.0 F) |
| 2016 | 33.3 C (91.9 F) |
| 2017 | 32.8 C (91.0 F) |
| 2018 | 32.8 C (91.0 F) |
| 2019 | 31.7 C (89.1 F) |
| 2020 | 32.8 C (91.0 F) |
| 2021 | 32.2 C (90.0 F) |
| 2022 | 32.2 C (90.0 F) |
| 2023 | 31.1 C (88.0 F) |
| 2024 | 32.8 C (91.0 F) |
| 2025 | 33.3 C (91.9 F) |
| 2026 | 34.4 C (93.9 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1949 | -14.4 C (6.1 F) |
| 1950 | -18.9 C (-2.0 F) |
| 1951 | -23.3 C (-9.9 F) |
| 1952 | -15.6 C (3.9 F) |
| 1953 | -13.9 C (7.0 F) |
| 1954 | -19.4 C (-2.9 F) |
| 1955 | -22.8 C (-9.0 F) |
| 1956 | -15.0 C (5.0 F) |
| 1957 | -22.8 C (-9.0 F) |
| 1958 | -22.2 C (-8.0 F) |
| 1959 | -20.6 C (-5.1 F) |
| 1960 | -20.0 C (-4.0 F) |
| 1961 | -23.9 C (-11.0 F) |
| 1962 | -21.7 C (-7.1 F) |
| 1963 | -27.8 C (-18.0 F) |
| 1964 | -18.3 C (-0.9 F) |
| 1965 | -25.0 C (-13.0 F) |
| 1966 | -23.3 C (-9.9 F) |
| 1967 | -17.8 C (0.0 F) |
| 1968 | -21.7 C (-7.1 F) |
| 1969 | -20.6 C (-5.1 F) |
| 1970 | -25.0 C (-13.0 F) |
| 1971 | -23.9 C (-11.0 F) |
| 1972 | -25.6 C (-14.1 F) |
| 1973 | -25.0 C (-13.0 F) |
| 1974 | -20.6 C (-5.1 F) |
| 1975 | -28.9 C (-20.0 F) |
| 1976 | -23.3 C (-9.9 F) |
| 1977 | -28.3 C (-18.9 F) |
| 1978 | -26.7 C (-16.1 F) |
| 1979 | -29.4 C (-20.9 F) |
| 1980 | -25.6 C (-14.1 F) |
| 1981 | -26.1 C (-15.0 F) |
| 1982 | -29.4 C (-20.9 F) |
| 1983 | -23.9 C (-11.0 F) |
| 1984 | -30.0 C (-22.0 F) |
| 1985 | -28.3 C (-18.9 F) |
| 1986 | -23.3 C (-9.9 F) |
| 1987 | -23.3 C (-9.9 F) |
| 1988 | -24.4 C (-11.9 F) |
| 1989 | -28.9 C (-20.0 F) |
| 1990 | -23.3 C (-9.9 F) |
| 1991 | -18.3 C (-0.9 F) |
| 1992 | -20.6 C (-5.1 F) |
| 1993 | -24.4 C (-11.9 F) |
| 1994 | -33.3 C (-27.9 F) |
| 1995 | -21.7 C (-7.1 F) |
| 1996 | -23.3 C (-9.9 F) |
| 1997 | -24.4 C (-11.9 F) |
| 1998 | -18.3 C (-0.9 F) |
| 1999 | -20.0 C (-4.0 F) |
| 2000 | -20.0 C (-4.0 F) |
| 2001 | -16.7 C (1.9 F) |
| 2002 | -15.6 C (3.9 F) |
| 2003 | -23.3 C (-9.9 F) |
| 2004 | -23.9 C (-11.0 F) |
| 2005 | -21.7 C (-7.1 F) |
| 2006 | -14.4 C (6.1 F) |
| 2007 | -19.4 C (-2.9 F) |
| 2008 | -17.8 C (0.0 F) |
| 2009 | -27.8 C (-18.0 F) |
| 2010 | -22.2 C (-8.0 F) |
| 2011 | -23.9 C (-11.0 F) |
| 2012 | -15.6 C (3.9 F) |
| 2013 | -18.9 C (-2.0 F) |
| 2014 | -25.0 C (-13.0 F) |
| 2015 | -27.2 C (-17.0 F) |
| 2016 | -23.3 C (-9.9 F) |
| 2017 | -20.6 C (-5.1 F) |
| 2018 | -26.1 C (-15.0 F) |
| 2019 | -22.2 C (-8.0 F) |
| 2020 | -17.2 C (1.0 F) |
| 2021 | -20.6 C (-5.1 F) |
| 2022 | -25.6 C (-14.1 F) |
| 2023 | -15.0 C (5.0 F) |
| 2024 | -18.9 C (-2.0 F) |
| 2025 | -24.4 C (-11.9 F) |
| 2026 | -31.1 C (-24.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1949 | 40.6 mm (1.6 in) |
| 1950 | 45.7 mm (1.8 in) |
| 1951 | 40.6 mm (1.6 in) |
| 1952 | 63.5 mm (2.5 in) |
| 1953 | 50.8 mm (2.0 in) |
| 1954 | 97.8 mm (3.9 in) |
| 1955 | 39.6 mm (1.6 in) |
| 1956 | 53.1 mm (2.1 in) |
| 1957 | 30.5 mm (1.2 in) |
| 1958 | 50.8 mm (2.0 in) |
| 1959 | 55.9 mm (2.2 in) |
| 1960 | 40.6 mm (1.6 in) |
| 1961 | 43.2 mm (1.7 in) |
| 1962 | 33.0 mm (1.3 in) |
| 1963 | 34.5 mm (1.4 in) |
| 1964 | 71.1 mm (2.8 in) |
| 1965 | 63.2 mm (2.5 in) |
| 1966 | 33.3 mm (1.3 in) |
| 1967 | 44.2 mm (1.7 in) |
| 1968 | 50.3 mm (2.0 in) |
| 1969 | 50.8 mm (2.0 in) |
| 1970 | 46.2 mm (1.8 in) |
| 1971 | 43.7 mm (1.7 in) |
| 1972 | 55.9 mm (2.2 in) |
| 1973 | 88.9 mm (3.5 in) |
| 1974 | 50.8 mm (2.0 in) |
| 1975 | 50.8 mm (2.0 in) |
| 1976 | 39.1 mm (1.5 in) |
| 1977 | 49.5 mm (1.9 in) |
| 1978 | 63.5 mm (2.5 in) |
| 1979 | 32.0 mm (1.3 in) |
| 1980 | 87.6 mm (3.4 in) |
| 1981 | 83.6 mm (3.3 in) |
| 1982 | 31.5 mm (1.2 in) |
| 1983 | 33.5 mm (1.3 in) |
| 1984 | 43.4 mm (1.7 in) |
| 1985 | 64.8 mm (2.6 in) |
| 1986 | 44.2 mm (1.7 in) |
| 1987 | 54.1 mm (2.1 in) |
| 1988 | 34.3 mm (1.4 in) |
| 1989 | 61.2 mm (2.4 in) |
| 1990 | 61.2 mm (2.4 in) |
| 1991 | 57.7 mm (2.3 in) |
| 1992 | 72.1 mm (2.8 in) |
| 1993 | 68.1 mm (2.7 in) |
| 1994 | 54.9 mm (2.2 in) |
| 1995 | 60.7 mm (2.4 in) |
| 1996 | 48.8 mm (1.9 in) |
| 1997 | 53.6 mm (2.1 in) |
| 1998 | 66.5 mm (2.6 in) |
| 1999 | 62.2 mm (2.4 in) |
| 2000 | 46.7 mm (1.8 in) |
| 2001 | 57.9 mm (2.3 in) |
| 2002 | 55.6 mm (2.2 in) |
| 2003 | 54.4 mm (2.1 in) |
| 2004 | 119.6 mm (4.7 in) |
| 2005 | 65.3 mm (2.6 in) |
| 2006 | 41.9 mm (1.6 in) |
| 2007 | 64.5 mm (2.5 in) |
| 2008 | 49.5 mm (1.9 in) |
| 2009 | 66.0 mm (2.6 in) |
| 2010 | 78.0 mm (3.1 in) |
| 2011 | 50.3 mm (2.0 in) |
| 2012 | 69.1 mm (2.7 in) |
| 2013 | 45.7 mm (1.8 in) |
| 2014 | 42.9 mm (1.7 in) |
| 2015 | 70.9 mm (2.8 in) |
| 2016 | 43.7 mm (1.7 in) |
| 2017 | 47.2 mm (1.9 in) |
| 2018 | 94.0 mm (3.7 in) |
| 2019 | 41.1 mm (1.6 in) |
| 2020 | 62.7 mm (2.5 in) |
| 2021 | 64.0 mm (2.5 in) |
| 2022 | 57.2 mm (2.3 in) |
| 2023 | 42.9 mm (1.7 in) |
| 2024 | 52.1 mm (2.1 in) |
| 2025 | 51.3 mm (2.0 in) |
| 2026 | 100.1 mm (3.9 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1949 | 82.3 mm (3.2 in) |
| 1950 | 76.1 mm (3.0 in) |
| 1951 | 81.3 mm (3.2 in) |
| 1952 | 98.8 mm (3.9 in) |
| 1953 | 55.6 mm (2.2 in) |
| 1954 | 115.3 mm (4.5 in) |
| 1955 | 71.4 mm (2.8 in) |
| 1956 | 156.3 mm (6.2 in) |
| 1957 | 55.7 mm (2.2 in) |
| 1958 | 103.9 mm (4.1 in) |
| 1959 | 64.3 mm (2.5 in) |
| 1960 | 94.5 mm (3.7 in) |
| 1961 | 52.4 mm (2.1 in) |
| 1962 | 50.5 mm (2.0 in) |
| 1963 | 51.8 mm (2.0 in) |
| 1964 | 81.4 mm (3.2 in) |
| 1965 | 112.2 mm (4.4 in) |
| 1966 | 60.2 mm (2.4 in) |
| 1967 | 76.4 mm (3.0 in) |
| 1968 | 66.1 mm (2.6 in) |
| 1969 | 61.0 mm (2.4 in) |
| 1970 | 87.3 mm (3.4 in) |
| 1971 | 68.4 mm (2.7 in) |
| 1972 | 110.0 mm (4.3 in) |
| 1973 | 88.9 mm (3.5 in) |
| 1974 | 98.0 mm (3.9 in) |
| 1975 | 101.7 mm (4.0 in) |
| 1976 | 59.2 mm (2.3 in) |
| 1977 | 76.9 mm (3.0 in) |
| 1978 | 84.8 mm (3.3 in) |
| 1979 | 75.2 mm (3.0 in) |
| 1980 | 117.3 mm (4.6 in) |
| 1981 | 122.9 mm (4.8 in) |
| 1982 | 58.7 mm (2.3 in) |
| 1983 | 74.7 mm (2.9 in) |
| 1984 | 70.8 mm (2.8 in) |
| 1985 | 113.3 mm (4.5 in) |
| 1986 | 104.2 mm (4.1 in) |
| 1987 | 67.6 mm (2.7 in) |
| 1988 | 86.1 mm (3.4 in) |
| 1989 | 71.6 mm (2.8 in) |
| 1990 | 111.2 mm (4.4 in) |
| 1991 | 59.7 mm (2.4 in) |
| 1992 | 106.4 mm (4.2 in) |
| 1993 | 103.2 mm (4.1 in) |
| 1994 | 93.0 mm (3.7 in) |
| 1995 | 68.1 mm (2.7 in) |
| 1996 | 72.2 mm (2.8 in) |
| 1997 | 79.7 mm (3.1 in) |
| 1998 | 84.8 mm (3.3 in) |
| 1999 | 66.6 mm (2.6 in) |
| 2000 | 74.6 mm (2.9 in) |
| 2001 | 79.7 mm (3.1 in) |
| 2002 | 70.4 mm (2.8 in) |
| 2003 | 107.0 mm (4.2 in) |
| 2004 | 123.9 mm (4.9 in) |
| 2005 | 90.7 mm (3.6 in) |
| 2006 | 109.0 mm (4.3 in) |
| 2007 | 96.8 mm (3.8 in) |
| 2008 | 74.5 mm (2.9 in) |
| 2009 | 118.9 mm (4.7 in) |
| 2010 | 86.1 mm (3.4 in) |
| 2011 | 75.2 mm (3.0 in) |
| 2012 | 86.8 mm (3.4 in) |
| 2013 | 66.1 mm (2.6 in) |
| 2014 | 101.6 mm (4.0 in) |
| 2015 | 112.1 mm (4.4 in) |
| 2016 | 77.7 mm (3.1 in) |
| 2017 | 87.5 mm (3.4 in) |
| 2018 | 133.1 mm (5.2 in) |
| 2019 | 92.4 mm (3.6 in) |
| 2020 | 110.9 mm (4.4 in) |
| 2021 | 82.0 mm (3.2 in) |
| 2022 | 66.4 mm (2.6 in) |
| 2023 | 68.9 mm (2.7 in) |
| 2024 | 107.4 mm (4.2 in) |
| 2025 | 92.0 mm (3.6 in) |
| 2026 | 110.0 mm (4.3 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1949 | 16 days |
| 1950 | 8 days |
| 1951 | 15 days |
| 1952 | 19 days |
| 1953 | 26 days |
| 1954 | 14 days |
| 1955 | 15 days |
| 1956 | 16 days |
| 1957 | 24 days |
| 1958 | 12 days |
| 1959 | 16 days |
| 1960 | 13 days |
| 1961 | 13 days |
| 1962 | 13 days |
| 1963 | 27 days |
| 1964 | 24 days |
| 1965 | 14 days |
| 1966 | 14 days |
| 1967 | 23 days |
| 1968 | 16 days |
| 1969 | 12 days |
| 1970 | 13 days |
| 1971 | 15 days |
| 1972 | 11 days |
| 1973 | 14 days |
| 1974 | 9 days |
| 1975 | 14 days |
| 1976 | 24 days |
| 1977 | 17 days |
| 1978 | 11 days |
| 1979 | 10 days |
| 1980 | 20 days |
| 1981 | 15 days |
| 1982 | 13 days |
| 1983 | 13 days |
| 1984 | 12 days |
| 1985 | 13 days |
| 1986 | 10 days |
| 1987 | 14 days |
| 1988 | 14 days |
| 1989 | 12 days |
| 1990 | 12 days |
| 1991 | 14 days |
| 1992 | 10 days |
| 1993 | 13 days |
| 1994 | 14 days |
| 1995 | 15 days |
| 1996 | 11 days |
| 1997 | 12 days |
| 1998 | 13 days |
| 1999 | 21 days |
| 2000 | 11 days |
| 2001 | 17 days |
| 2002 | 11 days |
| 2003 | 12 days |
| 2004 | 14 days |
| 2005 | 15 days |
| 2006 | 13 days |
| 2007 | 18 days |
| 2008 | 15 days |
| 2009 | 12 days |
| 2010 | 11 days |
| 2011 | 13 days |
| 2012 | 11 days |
| 2013 | 13 days |
| 2014 | 8 days |
| 2015 | 7 days |
| 2016 | 10 days |
| 2017 | 14 days |
| 2018 | 11 days |
| 2019 | 15 days |
| 2020 | 18 days |
| 2021 | 13 days |
| 2022 | 10 days |
| 2023 | 21 days |
| 2024 | 18 days |
| 2025 | 16 days |
| 2026 | 15 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
67 years with a frostAcross 67 years with a frost, the median last spring frost at Slippery Rock 1 SSW falls on 9 May and the median first autumn frost on 7 October, which leaves a median of 149 days between them.
In 1991 to 2025 the median growing season was 153 days. That is 6 days more than in 1951 to 1982.
Fitted over all years, the growing season changes by +1.5 days per decade at this station.
| Measure | Median, all years | Earliest period (1951 to 1982) | Recent period (1991 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 9 May | 10 May | 7 May | 3 days earlier | -0.5 days per decade |
| First autumn frost | 7 October | 8 October | 12 October | 4 days later | +1.0 days per decade |
| Growing days | 149 days | 147 days | 153 days | 6 days more | +1.5 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
72 years, 1950 to 2025A day with at least 51.8 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 110.0 mm (4.3 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 51.8 mm (2.0 in) | |
| 5 years | 66.5 mm (2.6 in) | |
| 10 years | 76.5 mm (3.0 in) | |
| 25 years | 89.7 mm (3.5 in) | |
| 50 years | 99.7 mm (3.9 in) | |
| 100 years | 110.0 mm (4.3 in) | Longer than the 72 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, 72 years of values from 1950 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: 119.6 mm (4.7 in) in 2004; 97.8 mm (3.9 in) in 1954; 94.0 mm (3.7 in) in 2018.
Station Changes
3 suspected3 changes were suspected in the annual mean temperature of Slippery Rock 1 SSW, at 1995, 2002 and 2016. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1995 ran 0.7 C (1.3 F) higher than in the years before (likely change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 2002 ran 0.5 C (0.9 F) higher than in the years before (likely change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 2016 ran 1.0 C (1.8 F) lower than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1995 | +0.7 | +1.3 | likely | 5 |
| 2002 | +0.5 | +0.9 | likely | 5 |
| 2016 | -1.0 | -1.8 | likely | 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
2006 to 2025 against 1961 to 1990Over 2006 to 2025, Slippery Rock 1 SSW had a mean temperature of 10.1 C (50.2 F) and 1,150.8 mm (45.3 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are E Stroudsburg (United States, 407 km away), Boonton 1 SE (United States, 476 km away) and Laurelton Ctr (United States, 239 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| E Stroudsburg | United States | 407 km (253 mi) | 10.0 C (50.1 F) | 1,204.8 mm (47.4 in) | 0.60 |
| Boonton 1 SE | United States | 476 km (296 mi) | 10.2 C (50.3 F) | 1,232.0 mm (48.5 in) | 0.61 |
| Laurelton Ctr | United States | 239 km (149 mi) | 10.3 C (50.6 F) | 1,108.1 mm (43.6 in) | 0.63 |
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 (2026-10-14).