Confluence 1 SW Dam Weather Records (USC00361705)
Record envelope, standing records and threshold days for Confluence 1 SW Dam (USC00361705), Pennsylvania, United States, with 81 years of record.
Key Facts for Confluence 1 SW Dam
- Confluence 1 SW Dam (USC00361705) is a weather station in Pennsylvania, United States at 39.80 latitude and -79.37 longitude, 454 m (1,490 ft) above sea level.
- The station reports from 1946 to 2026, 81 years of record.
- 1,464 records set at Confluence 1 SW Dam still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Confluence 1 SW Dam tied a daily record high minimum temperature of 15.0 C (59.0 F) on 15 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, 39.80 latitude, -79.37 longitude.
- Elevation: 454 m (1,490 ft).
- Period of record: 1946 to 2026, 81 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
9 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 24.4 C (75.9 F) | -34.4 C (-29.9 F) | 14.4 C (57.9 F) | -25.0 C (-13.0 F) |
| Feb | 25.6 C (78.1 F) | -28.9 C (-20.0 F) | 17.8 C (64.0 F) | -25.6 C (-14.1 F) |
| Mar | 29.4 C (84.9 F) | -23.3 C (-9.9 F) | 27.2 C (81.0 F) | -11.1 C (12.0 F) |
| Apr | 33.3 C (91.9 F) | -11.1 C (12.0 F) | 29.4 C (84.9 F) | -6.7 C (19.9 F) |
| May | 33.9 C (93.0 F) | -5.0 C (23.0 F) | 30.6 C (87.1 F) | -1.1 C (30.0 F) |
| Jun | 36.7 C (98.1 F) | -1.7 C (28.9 F) | 30.6 C (87.1 F) | 5.0 C (41.0 F) |
| Jul | 40.0 C (104.0 F) | 2.2 C (36.0 F) | 33.9 C (93.0 F) | 9.4 C (48.9 F) |
| Aug | 38.3 C (100.9 F) | 0.6 C (33.1 F) | 30.6 C (87.1 F) | 10.6 C (51.1 F) |
| Sep | 37.2 C (99.0 F) | -5.0 C (23.0 F) | 31.7 C (89.1 F) | 2.8 C (37.0 F) |
| Oct | 32.8 C (91.0 F) | -8.9 C (16.0 F) | 27.8 C (82.0 F) | 3.3 C (37.9 F) |
| Nov | 26.7 C (80.1 F) | -15.6 C (3.9 F) | n/a | n/a |
| Dec | 26.1 C (79.0 F) | -27.8 C (-18.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1946 | 7 |
| 1947 | 24 |
| 1948 | 15 |
| 1949 | 27 |
| 1950 | 31 |
| 1951 | 24 |
| 1952 | 20 |
| 1953 | 16 |
| 1954 | 23 |
| 1955 | 16 |
| 1956 | 25 |
| 1957 | 18 |
| 1958 | 21 |
| 1959 | 15 |
| 1960 | 16 |
| 1961 | 20 |
| 1962 | 17 |
| 1963 | 28 |
| 1964 | 17 |
| 1965 | 23 |
| 1966 | 20 |
| 1967 | 22 |
| 1968 | 20 |
| 1969 | 13 |
| 1970 | 24 |
| 1971 | 28 |
| 1972 | 19 |
| 1973 | 16 |
| 1974 | 18 |
| 1975 | 8 |
| 1976 | 22 |
| 1977 | 29 |
| 1978 | 12 |
| 1979 | 31 |
| 1980 | 9 |
| 1981 | 16 |
| 1982 | 25 |
| 1983 | 13 |
| 1984 | 18 |
| 1985 | 22 |
| 1986 | 15 |
| 1987 | 13 |
| 1988 | 45 |
| 1989 | 29 |
| 1990 | 21 |
| 1991 | 28 |
| 1992 | 14 |
| 1993 | 18 |
| 1994 | 37 |
| 1995 | 17 |
| 1996 | 18 |
| 1997 | 14 |
| 1998 | 18 |
| 1999 | 21 |
| 2000 | 16 |
| 2001 | 16 |
| 2002 | 15 |
| 2003 | 4 |
| 2004 | 8 |
| 2005 | 6 |
| 2006 | 8 |
| 2007 | 16 |
| 2008 | 10 |
| 2009 | 15 |
| 2010 | 8 |
| 2011 | 9 |
| 2012 | 17 |
| 2013 | 14 |
| 2014 | 14 |
| 2015 | 19 |
| 2016 | 25 |
| 2017 | 27 |
| 2018 | 34 |
| 2019 | 13 |
| 2020 | 16 |
| 2021 | 8 |
| 2022 | 12 |
| 2023 | 6 |
| 2024 | 10 |
| 2025 | 6 |
| 2026 | 16 |
All-Time Record Progression
19 new records| Date | Kind | Detail |
|---|---|---|
| 1977-01-18 | Record low maximum temperature | Record low maximum temperature -17.8 C (0.0 F) |
| 1983-12-26 | Record low maximum temperature | Record low maximum temperature -18.9 C (-2.0 F) |
| 1985-01-21 | Record low maximum temperature | Record low maximum temperature -23.3 C (-9.9 F) |
| 1988-07-08 | Record high maximum temperature | Record high maximum temperature 39.4 C (102.9 F) |
| 1988-07-17 | Record high maximum temperature | Record high maximum temperature 40.0 C (104.0 F) |
| 1992-12-11 | Record daily snowfall | Record daily snowfall 43.2 cm (17.0 in) |
| 1994-01-19 | Record low minimum temperature | Record low minimum temperature -32.8 C (-27.0 F) |
| 1994-01-22 | Record low minimum temperature | Record low minimum temperature -34.4 C (-29.9 F) |
| 1995-11-15 | Record daily snowfall | Record daily snowfall 53.3 cm (21.0 in) |
| 2002-07-29 | Record high minimum temperature | Record high minimum temperature 23.3 C (73.9 F) |
| 2003-02-17 | Record snow depth | Record snow depth 63.5 cm (25.0 in) |
| 2010-02-06 | Record daily snowfall | Record daily snowfall 61.0 cm (24.0 in) |
| 2010-02-06 | Record snow depth | Record snow depth 66.0 cm (26.0 in) |
| 2010-02-07 | Record snow depth | Record snow depth 71.1 cm (28.0 in) |
| 2010-02-10 | Record snow depth | Record snow depth 86.4 cm (34.0 in) |
| 2010-02-11 | Record snow depth | Record snow depth 91.4 cm (36.0 in) |
| 2010-02-12 | Record snow depth | Record snow depth 99.1 cm (39.0 in) |
| 2010-02-16 | Record snow depth | Record snow depth 104.1 cm (41.0 in) |
| 2010-02-27 | Record snow depth | Record snow depth 109.2 cm (43.0 in) |
Wettest Day of Each Month
Oct: 125.2 mm (4.9 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 65.5 mm (2.6 in) | 12 January 2005 |
| Feb | 61.2 mm (2.4 in) | 19 February 2000 |
| Mar | 77.5 mm (3.1 in) | 13 March 1972 |
| Apr | 55.4 mm (2.2 in) | 5 April 1984 |
| May | 68.3 mm (2.7 in) | 19 May 2004 |
| Jun | 92.7 mm (3.6 in) | 21 June 2018 |
| Jul | 82.3 mm (3.2 in) | 9 July 1985 |
| Aug | 94.7 mm (3.7 in) | 27 August 1979 |
| Sep | 103.6 mm (4.1 in) | 14 September 1971 |
| Oct | 125.2 mm (4.9 in) | 16 October 1954 |
| Nov | 62.5 mm (2.5 in) | 27 November 1985 |
| Dec | 67.6 mm (2.7 in) | 2 December 1974 |
Period of Record Coverage
1946 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1946 | 180 | 49% | No |
| 1947 | 350 | 96% | Yes |
| 1948 | 346 | 95% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 364 | 99% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 362 | 99% | Yes |
| 1956 | 361 | 99% | Yes |
| 1957 | 364 | 100% | Yes |
| 1958 | 354 | 97% | Yes |
| 1959 | 364 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 364 | 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 | 365 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 364 | 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 | 364 | 100% | Yes |
| 1979 | 332 | 91% | Yes |
| 1980 | 361 | 99% | Yes |
| 1981 | 357 | 98% | Yes |
| 1982 | 360 | 99% | Yes |
| 1983 | 364 | 100% | Yes |
| 1984 | 365 | 100% | Yes |
| 1985 | 362 | 99% | Yes |
| 1986 | 364 | 100% | Yes |
| 1987 | 364 | 100% | Yes |
| 1988 | 364 | 99% | Yes |
| 1989 | 363 | 99% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 366 | 100% | Yes |
| 1993 | 362 | 99% | 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 | 365 | 100% | Yes |
| 2001 | 363 | 99% | Yes |
| 2002 | 364 | 100% | Yes |
| 2003 | 365 | 100% | Yes |
| 2004 | 361 | 99% | Yes |
| 2005 | 353 | 97% | Yes |
| 2006 | 352 | 96% | Yes |
| 2007 | 355 | 97% | Yes |
| 2008 | 364 | 99% | Yes |
| 2009 | 364 | 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 | 348 | 95% | Yes |
| 2022 | 365 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 365 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 286 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 15 October 2026 | Confluence 1 SW Dam, US | daily high min (Tie, Provisional) | 15.0 C (59.0 F) | tie | 72 years | 7 of 100 (Routine) |
| 11 October 2026 | Confluence 1 SW Dam, US | daily rain (Provisional) | 41.7 mm (1.6 in) | 13.5 mm (0.5 in) | 36 years | 32 of 100 (Routine) |
| 11 August 2026 | Confluence 1 SW Dam, US | daily rain | 52.1 mm (2.1 in) | 25.4 mm (1.0 in) | 3 years | 32 of 100 (Routine) |
| 22 July 2026 | Confluence 1 SW Dam, US | daily rain | 49.5 mm (1.9 in) | 18.8 mm (0.7 in) | 17 years | 30 of 100 (Routine) |
| 3 July 2026 | Confluence 1 SW Dam, US | daily high min | 20.6 C (69.1 F) | 0.6 C (1.1 F) | 24 years | 16 of 100 (Routine) |
| 2 July 2026 | Confluence 1 SW Dam, US | daily high min | 20.0 C (68.0 F) | 0.6 C (1.1 F) | 72 years | 30 of 100 (Routine) |
| 23 June 2026 | Confluence 1 SW Dam, US | daily rain | 69.1 mm (2.7 in) | 13.2 mm (0.5 in) | 53 years | 36 of 100 (Notable) |
| 23 May 2026 | Confluence 1 SW Dam, US | daily rain | 40.9 mm (1.6 in) | 5.3 mm (0.21 in) | 16 years | 17 of 100 (Routine) |
| 15 May 2026 | Confluence 1 SW Dam, US | daily low max | 8.3 C (46.9 F) | 1.7 C (3.1 F) | 67 years | 31 of 100 (Routine) |
| 21 April 2026 | Confluence 1 SW Dam, US | daily snowfall | 0.5 cm (0.2 in) | 0.5 cm (0.2 in) | 76 years | 20 of 100 (Routine) |
| 16 April 2026 | Confluence 1 SW Dam, US | daily high min | 11.7 C (53.1 F) | 0.6 C (1.1 F) | 56 years | 26 of 100 (Routine) |
| 16 April 2026 | Confluence 1 SW Dam, US | daily high max | 29.4 C (84.9 F) | 1.1 C (2.0 F) | 32 years | 18 of 100 (Routine) |
| 15 April 2026 | Confluence 1 SW Dam, US | daily high min | 12.2 C (54.0 F) | 1.1 C (2.0 F) | 12 years | 13 of 100 (Routine) |
| 14 April 2026 | Confluence 1 SW Dam, US | daily high min (Tie) | 11.7 C (53.1 F) | tie | 76 years | 7 of 100 (Routine) |
| 5 April 2026 | Confluence 1 SW Dam, US | daily high max (Tie) | 27.8 C (82.0 F) | tie | 79 years | 7 of 100 (Routine) |
| 5 April 2026 | Confluence 1 SW Dam, US | daily high min (Tie) | 11.1 C (52.0 F) | tie | 44 years | 5 of 100 (Routine) |
| 4 April 2026 | Confluence 1 SW Dam, US | daily high min (Tie) | 10.0 C (50.0 F) | tie | 0 years | 2 of 100 (Routine) |
| 3 April 2026 | Confluence 1 SW Dam, US | daily high min | 10.0 C (50.0 F) | 0.6 C (1.1 F) | 69 years | 29 of 100 (Routine) |
| 2 April 2026 | Confluence 1 SW Dam, US | daily high min | 11.7 C (53.1 F) | 2.8 C (5.0 F) | 37 years | 24 of 100 (Routine) |
| 1 April 2026 | Confluence 1 SW Dam, US | daily high min | 12.8 C (55.0 F) | 4.5 C (8.1 F) | 28 years | 25 of 100 (Routine) |
Climate Trend
77 complete years, 1947 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1947 | 9.9 C | +0.20 C |
| 1948 | 10.0 C | +0.33 C |
| 1949 | 10.7 C | +1.03 C |
| 1950 | 9.3 C | -0.33 C |
| 1951 | 9.5 C | -0.15 C |
| 1952 | 10.1 C | +0.47 C |
| 1953 | 10.5 C | +0.81 C |
| 1954 | 9.6 C | -0.10 C |
| 1955 | 9.6 C | -0.09 C |
| 1956 | 9.8 C | +0.16 C |
| 1957 | 9.8 C | +0.17 C |
| 1959 | 10.0 C | +0.36 C |
| 1960 | 8.6 C | -1.02 C |
| 1961 | 9.3 C | -0.34 C |
| 1962 | 8.8 C | -0.81 C |
| 1963 | 8.2 C | -1.43 C |
| 1964 | 9.2 C | -0.48 C |
| 1965 | 9.3 C | -0.37 C |
| 1966 | 8.5 C | -1.14 C |
| 1967 | 9.0 C | -0.67 C |
| 1968 | 8.8 C | -0.81 C |
| 1969 | 8.8 C | -0.88 C |
| 1970 | 9.6 C | -0.03 C |
| 1971 | 9.6 C | -0.05 C |
| 1972 | 9.2 C | -0.49 C |
| 1973 | 10.2 C | +0.59 C |
| 1974 | 9.6 C | -0.01 C |
| 1975 | 10.0 C | +0.30 C |
| 1976 | 8.6 C | -1.01 C |
| 1977 | 9.2 C | -0.48 C |
| 1978 | 8.4 C | -1.30 C |
| 1980 | 9.2 C | -0.41 C |
| 1981 | 8.4 C | -1.25 C |
| 1982 | 9.5 C | -0.11 C |
| 1983 | 9.6 C | -0.08 C |
| 1984 | 9.0 C | -0.68 C |
| 1985 | 9.1 C | -0.52 C |
| 1986 | 9.5 C | -0.13 C |
| 1987 | 10.0 C | +0.36 C |
| 1988 | 9.7 C | +0.03 C |
| 1989 | 9.3 C | -0.39 C |
| 1990 | 11.2 C | +1.54 C |
| 1991 | 10.7 C | +1.07 C |
| 1992 | 9.4 C | -0.24 C |
| 1993 | 9.0 C | -0.70 C |
| 1994 | 8.3 C | -1.39 C |
| 1995 | 9.2 C | -0.42 C |
| 1996 | 8.7 C | -0.92 C |
| 1997 | 9.6 C | -0.09 C |
| 1998 | 11.3 C | +1.60 C |
| 1999 | 10.4 C | +0.77 C |
| 2000 | 9.7 C | +0.06 C |
| 2001 | 10.4 C | +0.70 C |
| 2002 | 10.4 C | +0.73 C |
| 2003 | 9.2 C | -0.46 C |
| 2004 | 10.1 C | +0.43 C |
| 2005 | 10.1 C | +0.41 C |
| 2006 | 10.1 C | +0.45 C |
| 2007 | 9.9 C | +0.20 C |
| 2008 | 9.3 C | -0.34 C |
| 2009 | 9.1 C | -0.53 C |
| 2010 | 9.3 C | -0.38 C |
| 2011 | 10.1 C | +0.48 C |
| 2012 | 10.8 C | +1.19 C |
| 2013 | 9.2 C | -0.46 C |
| 2014 | 8.6 C | -1.04 C |
| 2015 | 9.9 C | +0.21 C |
| 2016 | 10.9 C | +1.20 C |
| 2017 | 11.0 C | +1.30 C |
| 2018 | 10.6 C | +0.92 C |
| 2019 | 10.9 C | +1.22 C |
| 2020 | 10.8 C | +1.19 C |
| 2021 | 10.4 C | +0.71 C |
| 2022 | 9.3 C | -0.37 C |
| 2023 | 10.3 C | +0.67 C |
| 2024 | 10.8 C | +1.17 C |
| 2025 | 9.6 C | -0.01 C |
The annual mean temperature here has risen by 0.10 C (0.03 to 0.17) per decade over 1947 to 2025. In Fahrenheit: 0.2 F (0.1 to 0.3) per decade. The slope is a straight line fitted to 77 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.10 C (0.03 to 0.17) per decade | 0.2 F (0.1 to 0.3) per decade | 1947 to 2025 | 77 | Rise |
| Mean daily maximum | 0.09 C (0.00 to 0.18) per decade | 0.16 F (0.01 to 0.32) per decade | 1947 to 2025 | 77 | Rise |
| Mean daily minimum | 0.11 C (0.02 to 0.21) per decade | 0.20 F (0.03 to 0.37) per decade | 1947 to 2025 | 77 | 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
1946 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 40.0 C (104.0 F) | 1988 | 33.9 C (93.0 F) | 81 |
| Coldest night (TNn) | -34.4 C (-29.9 F) | 1994 | -22.2 C (-8.0 F) | 81 |
| Wettest day (Rx1day) | 125.2 mm (4.9 in) | 1954 | 50.5 mm (2.0 in) | 81 |
| Wettest five days (Rx5day) | 180.1 mm (7.1 in) | 2018 | 82.3 mm (3.2 in) | 81 |
| Longest dry spell (CDD) | 30 days | 1995 | 14 days | 81 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1946 | 35.0 C (95.0 F) |
| 1947 | 33.3 C (91.9 F) |
| 1948 | 36.7 C (98.1 F) |
| 1949 | 33.9 C (93.0 F) |
| 1950 | 32.2 C (90.0 F) |
| 1951 | 33.9 C (93.0 F) |
| 1952 | 35.6 C (96.1 F) |
| 1953 | 37.2 C (99.0 F) |
| 1954 | 36.1 C (97.0 F) |
| 1955 | 35.0 C (95.0 F) |
| 1956 | 33.3 C (91.9 F) |
| 1957 | 34.4 C (93.9 F) |
| 1958 | 32.2 C (90.0 F) |
| 1959 | 33.9 C (93.0 F) |
| 1960 | 31.1 C (88.0 F) |
| 1961 | 32.8 C (91.0 F) |
| 1962 | 34.4 C (93.9 F) |
| 1963 | 33.3 C (91.9 F) |
| 1964 | 34.4 C (93.9 F) |
| 1965 | 35.6 C (96.1 F) |
| 1966 | 36.1 C (97.0 F) |
| 1967 | 33.9 C (93.0 F) |
| 1968 | 33.9 C (93.0 F) |
| 1969 | 34.4 C (93.9 F) |
| 1970 | 32.2 C (90.0 F) |
| 1971 | 35.0 C (95.0 F) |
| 1972 | 32.8 C (91.0 F) |
| 1973 | 34.4 C (93.9 F) |
| 1974 | 32.2 C (90.0 F) |
| 1975 | 35.6 C (96.1 F) |
| 1976 | 33.3 C (91.9 F) |
| 1977 | 34.4 C (93.9 F) |
| 1978 | 32.8 C (91.0 F) |
| 1979 | 32.8 C (91.0 F) |
| 1980 | 35.0 C (95.0 F) |
| 1981 | 32.8 C (91.0 F) |
| 1982 | 32.8 C (91.0 F) |
| 1983 | 35.6 C (96.1 F) |
| 1984 | 33.9 C (93.0 F) |
| 1985 | 33.3 C (91.9 F) |
| 1986 | 33.3 C (91.9 F) |
| 1987 | 36.7 C (98.1 F) |
| 1988 | 40.0 C (104.0 F) |
| 1989 | 35.0 C (95.0 F) |
| 1990 | 35.6 C (96.1 F) |
| 1991 | 37.2 C (99.0 F) |
| 1992 | 32.2 C (90.0 F) |
| 1993 | 35.6 C (96.1 F) |
| 1994 | 36.1 C (97.0 F) |
| 1995 | 38.9 C (102.0 F) |
| 1996 | 33.9 C (93.0 F) |
| 1997 | 35.0 C (95.0 F) |
| 1998 | 34.4 C (93.9 F) |
| 1999 | 37.8 C (100.0 F) |
| 2000 | 33.3 C (91.9 F) |
| 2001 | 33.3 C (91.9 F) |
| 2002 | 33.9 C (93.0 F) |
| 2003 | 31.1 C (88.0 F) |
| 2004 | 31.7 C (89.1 F) |
| 2005 | 34.4 C (93.9 F) |
| 2006 | 33.3 C (91.9 F) |
| 2007 | 33.9 C (93.0 F) |
| 2008 | 32.2 C (90.0 F) |
| 2009 | 31.7 C (89.1 F) |
| 2010 | 34.4 C (93.9 F) |
| 2011 | 35.0 C (95.0 F) |
| 2012 | 36.1 C (97.0 F) |
| 2013 | 32.2 C (90.0 F) |
| 2014 | 31.1 C (88.0 F) |
| 2015 | 32.8 C (91.0 F) |
| 2016 | 35.6 C (96.1 F) |
| 2017 | 32.2 C (90.0 F) |
| 2018 | 33.9 C (93.0 F) |
| 2019 | 33.9 C (93.0 F) |
| 2020 | 34.4 C (93.9 F) |
| 2021 | 33.9 C (93.0 F) |
| 2022 | 32.8 C (91.0 F) |
| 2023 | 31.7 C (89.1 F) |
| 2024 | 34.4 C (93.9 F) |
| 2025 | 32.8 C (91.0 F) |
| 2026 | 33.9 C (93.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1946 | -15.6 C (3.9 F) |
| 1947 | -18.9 C (-2.0 F) |
| 1948 | -26.1 C (-15.0 F) |
| 1949 | -15.0 C (5.0 F) |
| 1950 | -22.8 C (-9.0 F) |
| 1951 | -21.7 C (-7.1 F) |
| 1952 | -16.1 C (3.0 F) |
| 1953 | -12.2 C (10.0 F) |
| 1954 | -22.8 C (-9.0 F) |
| 1955 | -22.2 C (-8.0 F) |
| 1956 | -19.4 C (-2.9 F) |
| 1957 | -22.2 C (-8.0 F) |
| 1958 | -22.2 C (-8.0 F) |
| 1959 | -18.3 C (-0.9 F) |
| 1960 | -24.4 C (-11.9 F) |
| 1961 | -22.8 C (-9.0 F) |
| 1962 | -25.0 C (-13.0 F) |
| 1963 | -30.0 C (-22.0 F) |
| 1964 | -23.3 C (-9.9 F) |
| 1965 | -23.3 C (-9.9 F) |
| 1966 | -24.4 C (-11.9 F) |
| 1967 | -21.1 C (-6.0 F) |
| 1968 | -25.0 C (-13.0 F) |
| 1969 | -19.4 C (-2.9 F) |
| 1970 | -20.6 C (-5.1 F) |
| 1971 | -19.4 C (-2.9 F) |
| 1972 | -23.3 C (-9.9 F) |
| 1973 | -22.2 C (-8.0 F) |
| 1974 | -12.2 C (10.0 F) |
| 1975 | -21.1 C (-6.0 F) |
| 1976 | -22.2 C (-8.0 F) |
| 1977 | -26.7 C (-16.1 F) |
| 1978 | -25.6 C (-14.1 F) |
| 1979 | -27.8 C (-18.0 F) |
| 1980 | -21.7 C (-7.1 F) |
| 1981 | -23.3 C (-9.9 F) |
| 1982 | -28.3 C (-18.9 F) |
| 1983 | -25.6 C (-14.1 F) |
| 1984 | -27.8 C (-18.0 F) |
| 1985 | -30.0 C (-22.0 F) |
| 1986 | -23.3 C (-9.9 F) |
| 1987 | -22.8 C (-9.0 F) |
| 1988 | -23.3 C (-9.9 F) |
| 1989 | -27.8 C (-18.0 F) |
| 1990 | -22.2 C (-8.0 F) |
| 1991 | -21.1 C (-6.0 F) |
| 1992 | -20.6 C (-5.1 F) |
| 1993 | -21.7 C (-7.1 F) |
| 1994 | -34.4 C (-29.9 F) |
| 1995 | -25.0 C (-13.0 F) |
| 1996 | -28.9 C (-20.0 F) |
| 1997 | -21.7 C (-7.1 F) |
| 1998 | -18.9 C (-2.0 F) |
| 1999 | -23.3 C (-9.9 F) |
| 2000 | -21.1 C (-6.0 F) |
| 2001 | -16.7 C (1.9 F) |
| 2002 | -15.6 C (3.9 F) |
| 2003 | -21.7 C (-7.1 F) |
| 2004 | -24.4 C (-11.9 F) |
| 2005 | -20.6 C (-5.1 F) |
| 2006 | -20.6 C (-5.1 F) |
| 2007 | -21.7 C (-7.1 F) |
| 2008 | -20.0 C (-4.0 F) |
| 2009 | -25.6 C (-14.1 F) |
| 2010 | -21.7 C (-7.1 F) |
| 2011 | -21.7 C (-7.1 F) |
| 2012 | -15.6 C (3.9 F) |
| 2013 | -16.7 C (1.9 F) |
| 2014 | -25.0 C (-13.0 F) |
| 2015 | -26.1 C (-15.0 F) |
| 2016 | -19.4 C (-2.9 F) |
| 2017 | -18.3 C (-0.9 F) |
| 2018 | -24.4 C (-11.9 F) |
| 2019 | -21.1 C (-6.0 F) |
| 2020 | -14.4 C (6.1 F) |
| 2021 | -18.3 C (-0.9 F) |
| 2022 | -21.7 C (-7.1 F) |
| 2023 | -16.1 C (3.0 F) |
| 2024 | -18.9 C (-2.0 F) |
| 2025 | -25.0 C (-13.0 F) |
| 2026 | -25.6 C (-14.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1946 | 31.5 mm (1.2 in) |
| 1947 | 43.2 mm (1.7 in) |
| 1948 | 63.2 mm (2.5 in) |
| 1949 | 51.6 mm (2.0 in) |
| 1950 | 77.7 mm (3.1 in) |
| 1951 | 49.0 mm (1.9 in) |
| 1952 | 35.3 mm (1.4 in) |
| 1953 | 30.2 mm (1.2 in) |
| 1954 | 125.2 mm (4.9 in) |
| 1955 | 44.7 mm (1.8 in) |
| 1956 | 80.8 mm (3.2 in) |
| 1957 | 50.5 mm (2.0 in) |
| 1958 | 38.6 mm (1.5 in) |
| 1959 | 56.1 mm (2.2 in) |
| 1960 | 51.8 mm (2.0 in) |
| 1961 | 59.2 mm (2.3 in) |
| 1962 | 53.3 mm (2.1 in) |
| 1963 | 45.5 mm (1.8 in) |
| 1964 | 80.5 mm (3.2 in) |
| 1965 | 35.6 mm (1.4 in) |
| 1966 | 42.7 mm (1.7 in) |
| 1967 | 49.8 mm (2.0 in) |
| 1968 | 61.0 mm (2.4 in) |
| 1969 | 50.8 mm (2.0 in) |
| 1970 | 49.0 mm (1.9 in) |
| 1971 | 103.6 mm (4.1 in) |
| 1972 | 77.5 mm (3.1 in) |
| 1973 | 44.5 mm (1.8 in) |
| 1974 | 67.6 mm (2.7 in) |
| 1975 | 65.3 mm (2.6 in) |
| 1976 | 42.7 mm (1.7 in) |
| 1977 | 35.3 mm (1.4 in) |
| 1978 | 57.2 mm (2.3 in) |
| 1979 | 94.7 mm (3.7 in) |
| 1980 | 38.4 mm (1.5 in) |
| 1981 | 45.0 mm (1.8 in) |
| 1982 | 40.9 mm (1.6 in) |
| 1983 | 33.5 mm (1.3 in) |
| 1984 | 56.9 mm (2.2 in) |
| 1985 | 82.3 mm (3.2 in) |
| 1986 | 50.0 mm (2.0 in) |
| 1987 | 41.4 mm (1.6 in) |
| 1988 | 41.9 mm (1.6 in) |
| 1989 | 62.5 mm (2.5 in) |
| 1990 | 50.8 mm (2.0 in) |
| 1991 | 41.4 mm (1.6 in) |
| 1992 | 47.8 mm (1.9 in) |
| 1993 | 56.6 mm (2.2 in) |
| 1994 | 49.5 mm (1.9 in) |
| 1995 | 31.8 mm (1.3 in) |
| 1996 | 78.7 mm (3.1 in) |
| 1997 | 45.5 mm (1.8 in) |
| 1998 | 44.2 mm (1.7 in) |
| 1999 | 49.0 mm (1.9 in) |
| 2000 | 61.2 mm (2.4 in) |
| 2001 | 38.1 mm (1.5 in) |
| 2002 | 50.5 mm (2.0 in) |
| 2003 | 55.9 mm (2.2 in) |
| 2004 | 77.0 mm (3.0 in) |
| 2005 | 69.9 mm (2.8 in) |
| 2006 | 49.5 mm (1.9 in) |
| 2007 | 94.0 mm (3.7 in) |
| 2008 | 42.9 mm (1.7 in) |
| 2009 | 67.6 mm (2.7 in) |
| 2010 | 53.6 mm (2.1 in) |
| 2011 | 64.8 mm (2.6 in) |
| 2012 | 100.1 mm (3.9 in) |
| 2013 | 40.9 mm (1.6 in) |
| 2014 | 57.7 mm (2.3 in) |
| 2015 | 51.8 mm (2.0 in) |
| 2016 | 39.6 mm (1.6 in) |
| 2017 | 73.9 mm (2.9 in) |
| 2018 | 92.7 mm (3.6 in) |
| 2019 | 36.8 mm (1.4 in) |
| 2020 | 40.9 mm (1.6 in) |
| 2021 | 59.2 mm (2.3 in) |
| 2022 | 49.8 mm (2.0 in) |
| 2023 | 41.9 mm (1.6 in) |
| 2024 | 56.6 mm (2.2 in) |
| 2025 | 48.3 mm (1.9 in) |
| 2026 | 69.1 mm (2.7 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1946 | 37.8 mm (1.5 in) |
| 1947 | 54.1 mm (2.1 in) |
| 1948 | 110.0 mm (4.3 in) |
| 1949 | 73.0 mm (2.9 in) |
| 1950 | 91.3 mm (3.6 in) |
| 1951 | 128.9 mm (5.1 in) |
| 1952 | 60.3 mm (2.4 in) |
| 1953 | 57.8 mm (2.3 in) |
| 1954 | 126.8 mm (5.0 in) |
| 1955 | 98.6 mm (3.9 in) |
| 1956 | 105.9 mm (4.2 in) |
| 1957 | 63.3 mm (2.5 in) |
| 1958 | 77.8 mm (3.1 in) |
| 1959 | 67.8 mm (2.7 in) |
| 1960 | 69.9 mm (2.8 in) |
| 1961 | 82.4 mm (3.2 in) |
| 1962 | 61.0 mm (2.4 in) |
| 1963 | 72.9 mm (2.9 in) |
| 1964 | 135.4 mm (5.3 in) |
| 1965 | 42.4 mm (1.7 in) |
| 1966 | 64.9 mm (2.6 in) |
| 1967 | 122.0 mm (4.8 in) |
| 1968 | 87.9 mm (3.5 in) |
| 1969 | 96.2 mm (3.8 in) |
| 1970 | 63.3 mm (2.5 in) |
| 1971 | 150.6 mm (5.9 in) |
| 1972 | 99.8 mm (3.9 in) |
| 1973 | 78.3 mm (3.1 in) |
| 1974 | 87.3 mm (3.4 in) |
| 1975 | 78.5 mm (3.1 in) |
| 1976 | 76.9 mm (3.0 in) |
| 1977 | 66.8 mm (2.6 in) |
| 1978 | 82.6 mm (3.3 in) |
| 1979 | 114.6 mm (4.5 in) |
| 1980 | 69.6 mm (2.7 in) |
| 1981 | 98.3 mm (3.9 in) |
| 1982 | 52.6 mm (2.1 in) |
| 1983 | 83.5 mm (3.3 in) |
| 1984 | 73.4 mm (2.9 in) |
| 1985 | 121.2 mm (4.8 in) |
| 1986 | 91.7 mm (3.6 in) |
| 1987 | 65.0 mm (2.6 in) |
| 1988 | 75.2 mm (3.0 in) |
| 1989 | 83.8 mm (3.3 in) |
| 1990 | 76.8 mm (3.0 in) |
| 1991 | 64.3 mm (2.5 in) |
| 1992 | 75.8 mm (3.0 in) |
| 1993 | 84.0 mm (3.3 in) |
| 1994 | 89.4 mm (3.5 in) |
| 1995 | 56.1 mm (2.2 in) |
| 1996 | 96.7 mm (3.8 in) |
| 1997 | 76.0 mm (3.0 in) |
| 1998 | 51.6 mm (2.0 in) |
| 1999 | 82.6 mm (3.3 in) |
| 2000 | 69.9 mm (2.8 in) |
| 2001 | 53.6 mm (2.1 in) |
| 2002 | 70.5 mm (2.8 in) |
| 2003 | 92.0 mm (3.6 in) |
| 2004 | 125.8 mm (5.0 in) |
| 2005 | 101.4 mm (4.0 in) |
| 2006 | 63.3 mm (2.5 in) |
| 2007 | 145.3 mm (5.7 in) |
| 2008 | 82.3 mm (3.2 in) |
| 2009 | 103.7 mm (4.1 in) |
| 2010 | 74.2 mm (2.9 in) |
| 2011 | 118.4 mm (4.7 in) |
| 2012 | 128.6 mm (5.1 in) |
| 2013 | 79.8 mm (3.1 in) |
| 2014 | 86.1 mm (3.4 in) |
| 2015 | 79.8 mm (3.1 in) |
| 2016 | 56.1 mm (2.2 in) |
| 2017 | 107.2 mm (4.2 in) |
| 2018 | 180.1 mm (7.1 in) |
| 2019 | 65.6 mm (2.6 in) |
| 2020 | 86.1 mm (3.4 in) |
| 2021 | 98.8 mm (3.9 in) |
| 2022 | 71.2 mm (2.8 in) |
| 2023 | 67.5 mm (2.7 in) |
| 2024 | 120.4 mm (4.7 in) |
| 2025 | 114.6 mm (4.5 in) |
| 2026 | 92.0 mm (3.6 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1946 | 10 days |
| 1947 | 17 days |
| 1948 | 11 days |
| 1949 | 21 days |
| 1950 | 10 days |
| 1951 | 16 days |
| 1952 | 18 days |
| 1953 | 21 days |
| 1954 | 13 days |
| 1955 | 19 days |
| 1956 | 14 days |
| 1957 | 16 days |
| 1958 | 13 days |
| 1959 | 19 days |
| 1960 | 12 days |
| 1961 | 11 days |
| 1962 | 19 days |
| 1963 | 23 days |
| 1964 | 26 days |
| 1965 | 15 days |
| 1966 | 14 days |
| 1967 | 18 days |
| 1968 | 12 days |
| 1969 | 12 days |
| 1970 | 13 days |
| 1971 | 14 days |
| 1972 | 9 days |
| 1973 | 12 days |
| 1974 | 16 days |
| 1975 | 12 days |
| 1976 | 16 days |
| 1977 | 16 days |
| 1978 | 11 days |
| 1979 | 9 days |
| 1980 | 15 days |
| 1981 | 14 days |
| 1982 | 13 days |
| 1983 | 22 days |
| 1984 | 11 days |
| 1985 | 14 days |
| 1986 | 9 days |
| 1987 | 12 days |
| 1988 | 24 days |
| 1989 | 9 days |
| 1990 | 12 days |
| 1991 | 25 days |
| 1992 | 10 days |
| 1993 | 13 days |
| 1994 | 11 days |
| 1995 | 30 days |
| 1996 | 9 days |
| 1997 | 13 days |
| 1998 | 18 days |
| 1999 | 16 days |
| 2000 | 13 days |
| 2001 | 13 days |
| 2002 | 21 days |
| 2003 | 12 days |
| 2004 | 12 days |
| 2005 | 24 days |
| 2006 | 13 days |
| 2007 | 14 days |
| 2008 | 18 days |
| 2009 | 16 days |
| 2010 | 10 days |
| 2011 | 11 days |
| 2012 | 11 days |
| 2013 | 15 days |
| 2014 | 9 days |
| 2015 | 10 days |
| 2016 | 10 days |
| 2017 | 20 days |
| 2018 | 9 days |
| 2019 | 21 days |
| 2020 | 15 days |
| 2021 | 14 days |
| 2022 | 10 days |
| 2023 | 21 days |
| 2024 | 15 days |
| 2025 | 15 days |
| 2026 | 9 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
77 years with a frostAcross 77 years with a frost, the median last spring frost at Confluence 1 SW Dam falls on 8 May and the median first autumn frost on 10 October, which leaves a median of 154 days between them.
In 1996 to 2025 the median growing season was 165 days. That is 14 days more than in 1947 to 1977.
Fitted over all years, the growing season changes by +2.4 days per decade at this station.
| Measure | Median, all years | Earliest period (1947 to 1977) | Recent period (1996 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 8 May | 9 May | 6 May | 3 days earlier | -0.6 days per decade |
| First autumn frost | 10 October | 7 October | 18 October | 11 days later | +1.7 days per decade |
| Growing days | 154 days | 151 days | 165 days | 14 days more | +2.4 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
79 years, 1947 to 2025A day with at least 51.4 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 126.5 mm (5.0 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 51.4 mm (2.0 in) | |
| 5 years | 67.0 mm (2.6 in) | |
| 10 years | 79.0 mm (3.1 in) | |
| 25 years | 96.1 mm (3.8 in) | |
| 50 years | 110.5 mm (4.4 in) | |
| 100 years | 126.5 mm (5.0 in) | Longer than the 79 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, 79 years of values from 1947 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: 125.2 mm (4.9 in) in 1954; 103.6 mm (4.1 in) in 1971; 100.1 mm (3.9 in) in 2012.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Climate Twins
2011 to 2025 against 1961 to 1990Over 2011 to 2025, Confluence 1 SW Dam had a mean temperature of 10.2 C (50.4 F) and 1,260.6 mm (49.6 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Stamford 5 N (United States, 514 km away), Catoctin Mtn Park (United States, 162 km away) and Mt Carmel (United States, 574 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Stamford 5 N | United States | 514 km (319 mi) | 10.4 C (50.7 F) | 1,259.4 mm (49.6 in) | 0.70 |
| Catoctin Mtn Park | United States | 162 km (101 mi) | 10.6 C (51.1 F) | 1,229.2 mm (48.4 in) | 0.75 |
| Mt Carmel | United States | 574 km (357 mi) | 10.3 C (50.5 F) | 1,263.7 mm (49.8 in) | 0.76 |
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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-17).