Ross Dam Weather Records (USC00457185)
Record envelope, standing records and threshold days for Ross Dam (USC00457185), Washington, United States, with 67 years of record.
Key Facts for Ross Dam
- Ross Dam (USC00457185) is a weather station in Washington, United States at 48.73 latitude and -121.07 longitude, 377 m (1,236 ft) above sea level.
- The station reports from 1960 to 2026, 67 years of record.
- 1,464 records set at Ross Dam still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Ross Dam tied a daily record high minimum temperature of 11.1 C (52.0 F) on 4 October 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Washington, United States, 48.73 latitude, -121.07 longitude.
- Elevation: 377 m (1,236 ft).
- Period of record: 1960 to 2026, 67 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
5 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 13.9 C (57.0 F) | -18.3 C (-0.9 F) | 7.8 C (46.0 F) | -3.9 C (25.0 F) |
| Feb | 16.1 C (61.0 F) | -16.1 C (3.0 F) | 8.9 C (48.0 F) | -7.2 C (19.0 F) |
| Mar | 21.7 C (71.1 F) | -12.2 C (10.0 F) | 14.4 C (57.9 F) | -1.7 C (28.9 F) |
| Apr | 28.3 C (82.9 F) | -2.8 C (27.0 F) | 23.9 C (75.0 F) | 0.6 C (33.1 F) |
| May | 36.1 C (97.0 F) | -2.8 C (27.0 F) | 30.0 C (86.0 F) | 1.7 C (35.1 F) |
| Jun | 42.2 C (108.0 F) | 2.2 C (36.0 F) | 32.8 C (91.0 F) | 5.6 C (42.1 F) |
| Jul | 39.4 C (102.9 F) | 2.8 C (37.0 F) | 38.9 C (102.0 F) | 9.4 C (48.9 F) |
| Aug | 38.9 C (102.0 F) | 4.4 C (39.9 F) | 34.4 C (93.9 F) | 10.0 C (50.0 F) |
| Sep | 36.7 C (98.1 F) | 1.1 C (34.0 F) | 28.9 C (84.0 F) | 5.6 C (42.1 F) |
| Oct | 30.0 C (86.0 F) | -8.9 C (16.0 F) | 24.4 C (75.9 F) | 6.1 C (43.0 F) |
| Nov | 17.8 C (64.0 F) | -13.9 C (7.0 F) | n/a | n/a |
| Dec | 15.6 C (60.1 F) | -18.3 C (-0.9 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1960 | 3 |
| 1961 | 27 |
| 1962 | 46 |
| 1963 | 28 |
| 1964 | 25 |
| 1965 | 25 |
| 1966 | 24 |
| 1967 | 15 |
| 1968 | 15 |
| 1969 | 29 |
| 1970 | 26 |
| 1971 | 25 |
| 1972 | 41 |
| 1973 | 37 |
| 1974 | 14 |
| 1975 | 26 |
| 1976 | 21 |
| 1977 | 21 |
| 1978 | 14 |
| 1979 | 13 |
| 1980 | 24 |
| 1981 | 27 |
| 1982 | 15 |
| 1983 | 25 |
| 1984 | 24 |
| 1985 | 34 |
| 1986 | 26 |
| 1987 | 23 |
| 1988 | 28 |
| 1989 | 25 |
| 1990 | 26 |
| 1991 | 15 |
| 1992 | 41 |
| 1993 | 21 |
| 1994 | 18 |
| 1995 | 26 |
| 1996 | 32 |
| 1997 | 9 |
| 1998 | 20 |
| 1999 | 10 |
| 2000 | 7 |
| 2001 | 12 |
| 2002 | 26 |
| 2003 | 19 |
| 2004 | 23 |
| 2005 | 26 |
| 2006 | 15 |
| 2007 | 9 |
| 2008 | 21 |
| 2009 | 12 |
| 2010 | 19 |
| 2011 | 15 |
| 2012 | 20 |
| 2013 | 12 |
| 2014 | 17 |
| 2015 | 35 |
| 2016 | 28 |
| 2017 | 21 |
| 2018 | 22 |
| 2019 | 16 |
| 2020 | 19 |
| 2021 | 35 |
| 2022 | 27 |
| 2023 | 17 |
| 2024 | 13 |
| 2025 | 21 |
| 2026 | 13 |
All-Time Record Progression
8 new records| Date | Kind | Detail |
|---|---|---|
| 1995-11-08 | Record daily precipitation | Record daily precipitation 136.1 mm (5.4 in) |
| 1998-07-27 | Record high minimum temperature | Record high minimum temperature 19.4 C (66.9 F) |
| 2002-02-22 | Record daily precipitation | Record daily precipitation 137.7 mm (5.4 in) |
| 2003-10-17 | Record daily precipitation | Record daily precipitation 174.0 mm (6.9 in) |
| 2006-07-22 | Record high maximum temperature | Record high maximum temperature 39.4 C (102.9 F) |
| 2018-08-10 | Record high minimum temperature | Record high minimum temperature 20.0 C (68.0 F) |
| 2021-06-28 | Record high maximum temperature | Record high maximum temperature 42.2 C (108.0 F) |
| 2021-06-28 | Record high minimum temperature | Record high minimum temperature 21.1 C (70.0 F) |
Wettest Day of Each Month
Oct: 174.0 mm (6.9 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 104.9 mm (4.1 in) | 8 January 2009 |
| Feb | 137.7 mm (5.4 in) | 22 February 2002 |
| Mar | 90.7 mm (3.6 in) | 12 March 2007 |
| Apr | 71.6 mm (2.8 in) | 4 April 1991 |
| May | 63.0 mm (2.5 in) | 12 May 1987 |
| Jun | 55.6 mm (2.2 in) | 2 June 1968 |
| Jul | 49.5 mm (1.9 in) | 9 July 1997 |
| Aug | 41.1 mm (1.6 in) | 25 August 2004 |
| Sep | 66.8 mm (2.6 in) | 18 September 2021 |
| Oct | 174.0 mm (6.9 in) | 17 October 2003 |
| Nov | 136.1 mm (5.4 in) | 8 November 1995 |
| Dec | 119.9 mm (4.7 in) | 11 December 2025 |
Period of Record Coverage
1960 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1960 | 120 | 33% | No |
| 1961 | 365 | 100% | Yes |
| 1962 | 311 | 85% | No |
| 1963 | 363 | 99% | Yes |
| 1964 | 355 | 97% | Yes |
| 1965 | 359 | 98% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 362 | 99% | Yes |
| 1968 | 314 | 86% | No |
| 1969 | 350 | 96% | Yes |
| 1970 | 358 | 98% | Yes |
| 1971 | 364 | 100% | Yes |
| 1972 | 365 | 100% | Yes |
| 1973 | 364 | 100% | Yes |
| 1974 | 361 | 99% | Yes |
| 1975 | 357 | 98% | Yes |
| 1976 | 364 | 99% | Yes |
| 1977 | 354 | 97% | Yes |
| 1978 | 341 | 93% | Yes |
| 1979 | 353 | 97% | Yes |
| 1980 | 359 | 98% | Yes |
| 1981 | 340 | 93% | Yes |
| 1982 | 345 | 95% | Yes |
| 1983 | 352 | 96% | Yes |
| 1984 | 324 | 89% | No |
| 1985 | 353 | 97% | Yes |
| 1986 | 362 | 99% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 364 | 99% | Yes |
| 1989 | 356 | 98% | Yes |
| 1990 | 362 | 99% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 366 | 100% | Yes |
| 1993 | 337 | 92% | Yes |
| 1994 | 365 | 100% | Yes |
| 1995 | 364 | 100% | Yes |
| 1996 | 366 | 100% | Yes |
| 1997 | 365 | 100% | Yes |
| 1998 | 364 | 100% | Yes |
| 1999 | 365 | 100% | Yes |
| 2000 | 365 | 100% | Yes |
| 2001 | 364 | 100% | Yes |
| 2002 | 365 | 100% | Yes |
| 2003 | 364 | 100% | Yes |
| 2004 | 366 | 100% | Yes |
| 2005 | 364 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 365 | 100% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 273 | 75% | No |
| 2010 | 365 | 100% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 366 | 100% | Yes |
| 2013 | 365 | 100% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 356 | 98% | 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 | 357 | 98% | Yes |
| 2023 | 362 | 99% | Yes |
| 2024 | 365 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 281 | 77% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 4 October 2026 | Ross Dam, US | daily high min (Tie, Provisional) | 11.1 C (52.0 F) | tie | 32 years | 3 of 100 (Routine) |
| 23 August 2026 | Ross Dam, US | daily high min (Tie, Provisional) | 16.1 C (61.0 F) | tie | 8 years | 2 of 100 (Routine) |
| 22 August 2026 | Ross Dam, US | daily high min (Provisional) | 17.2 C (63.0 F) | 0.5 C (0.9 F) | 8 years | 10 of 100 (Routine) |
| 21 August 2026 | Ross Dam, US | daily high max (Tie, Provisional) | 34.4 C (93.9 F) | tie | 9 years | 2 of 100 (Routine) |
| 23 July 2026 | Ross Dam, US | monthly high min (Tie) | 19.4 C (66.9 F) | tie | 27 years | 6 of 100 (Routine) |
| 23 July 2026 | Ross Dam, US | daily high max (Tie) | 38.9 C (102.0 F) | tie | 20 years | 3 of 100 (Routine) |
| 24 June 2026 | Ross Dam, US | daily high min (Tie) | 15.6 C (60.1 F) | tie | 33 years | 4 of 100 (Routine) |
| 16 June 2026 | Ross Dam, US | daily high min | 16.7 C (62.1 F) | 2.3 C (4.1 F) | 11 years | 18 of 100 (Routine) |
| 15 June 2026 | Ross Dam, US | daily high min | 13.3 C (55.9 F) | 1.1 C (2.0 F) | 63 years | 28 of 100 (Routine) |
| 15 June 2026 | Ross Dam, US | daily high max | 32.8 C (91.0 F) | 0.6 C (1.1 F) | 64 years | 26 of 100 (Routine) |
| 16 May 2026 | Ross Dam, US | daily low max | 8.3 C (46.9 F) | 1.1 C (2.0 F) | 60 years | 25 of 100 (Routine) |
| 6 May 2026 | Ross Dam, US | daily high min | 12.2 C (54.0 F) | 1.6 C (2.9 F) | 33 years | 22 of 100 (Routine) |
| 5 May 2026 | Ross Dam, US | daily high min (Tie) | 10.0 C (50.0 F) | tie | 33 years | 4 of 100 (Routine) |
| 4 May 2026 | Ross Dam, US | daily high max | 29.4 C (84.9 F) | 2.7 C (4.9 F) | 60 years | 28 of 100 (Routine) |
| 4 May 2026 | Ross Dam, US | daily high min | 10.6 C (51.1 F) | 0.6 C (1.1 F) | 3 years | 8 of 100 (Routine) |
| 13 April 2026 | Ross Dam, US | daily high min | 6.7 C (44.1 F) | 0.6 C (1.1 F) | 21 years | 14 of 100 (Routine) |
| 12 April 2026 | Ross Dam, US | daily high min | 6.7 C (44.1 F) | 0.6 C (1.1 F) | 36 years | 18 of 100 (Routine) |
| 7 April 2026 | Ross Dam, US | daily high max (Tie) | 23.3 C (73.9 F) | tie | 48 years | 5 of 100 (Routine) |
| 20 March 2026 | Ross Dam, US | daily high min | 6.1 C (43.0 F) | 1.7 C (3.1 F) | 41 years | 25 of 100 (Routine) |
| 20 March 2026 | Ross Dam, US | daily rain | 36.8 mm (1.4 in) | 7.6 mm (0.30 in) | 24 years | 20 of 100 (Routine) |
Climate Trend
60 complete years, 1961 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1961 | 9.2 C | -0.12 C |
| 1963 | 9.3 C | -0.04 C |
| 1964 | 8.1 C | -1.23 C |
| 1965 | 9.2 C | -0.15 C |
| 1966 | 9.2 C | -0.20 C |
| 1967 | 9.8 C | +0.44 C |
| 1969 | 9.1 C | -0.25 C |
| 1970 | 9.1 C | -0.24 C |
| 1971 | 8.2 C | -1.12 C |
| 1972 | 8.3 C | -1.11 C |
| 1973 | 9.1 C | -0.26 C |
| 1974 | 9.4 C | +0.06 C |
| 1975 | 8.3 C | -1.10 C |
| 1976 | 8.9 C | -0.43 C |
| 1977 | 9.2 C | -0.18 C |
| 1978 | 9.0 C | -0.32 C |
| 1979 | 9.3 C | -0.10 C |
| 1980 | 9.0 C | -0.35 C |
| 1981 | 9.8 C | +0.44 C |
| 1982 | 8.5 C | -0.83 C |
| 1983 | 9.3 C | -0.08 C |
| 1985 | 8.3 C | -1.03 C |
| 1986 | 9.7 C | +0.37 C |
| 1987 | 10.5 C | +1.09 C |
| 1988 | 9.5 C | +0.12 C |
| 1989 | 9.3 C | -0.03 C |
| 1990 | 9.3 C | -0.03 C |
| 1991 | 9.4 C | +0.00 C |
| 1992 | 10.5 C | +1.10 C |
| 1994 | 9.8 C | +0.45 C |
| 1995 | 9.8 C | +0.40 C |
| 1996 | 8.4 C | -0.93 C |
| 1997 | 9.2 C | -0.18 C |
| 1998 | 10.3 C | +0.97 C |
| 1999 | 8.9 C | -0.46 C |
| 2000 | 9.0 C | -0.36 C |
| 2001 | 9.4 C | -0.01 C |
| 2002 | 9.3 C | -0.10 C |
| 2003 | 10.1 C | +0.71 C |
| 2004 | 10.3 C | +0.97 C |
| 2005 | 9.9 C | +0.56 C |
| 2006 | 9.9 C | +0.49 C |
| 2007 | 9.3 C | -0.10 C |
| 2008 | 8.7 C | -0.71 C |
| 2010 | 9.4 C | +0.01 C |
| 2011 | 8.1 C | -1.23 C |
| 2012 | 9.2 C | -0.15 C |
| 2013 | 9.6 C | +0.22 C |
| 2014 | 9.8 C | +0.42 C |
| 2015 | 11.0 C | +1.66 C |
| 2016 | 10.1 C | +0.73 C |
| 2017 | 9.3 C | -0.08 C |
| 2018 | 9.8 C | +0.47 C |
| 2019 | 9.2 C | -0.19 C |
| 2020 | 9.3 C | -0.08 C |
| 2021 | 9.5 C | +0.14 C |
| 2022 | 9.1 C | -0.28 C |
| 2023 | 9.9 C | +0.57 C |
| 2024 | 9.9 C | +0.51 C |
| 2025 | 10.4 C | +0.99 C |
The annual mean temperature here has risen by 0.13 C (0.05 to 0.21) per decade over 1961 to 2025. In Fahrenheit: 0.2 F (0.1 to 0.4) per decade. The slope is a straight line fitted to 60 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.13 C (0.05 to 0.21) per decade | 0.2 F (0.1 to 0.4) per decade | 1961 to 2025 | 60 | Rise |
| Mean daily maximum | 0.10 C (0.00 to 0.19) per decade | 0.17 F (0.01 to 0.34) per decade | 1961 to 2025 | 60 | Rise |
| Mean daily minimum | 0.2 C (0.1 to 0.2) per decade | 0.3 F (0.2 to 0.4) per decade | 1961 to 2025 | 60 | 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
1960 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 42.2 C (108.0 F) | 2021 | 36.1 C (97.0 F) | 67 |
| Coldest night (TNn) | -18.3 C (-0.9 F) | 1978 | -12.2 C (10.0 F) | 67 |
| Wettest day (Rx1day) | 174.0 mm (6.9 in) | 2003 | 73.7 mm (2.9 in) | 67 |
| Wettest five days (Rx5day) | 355.1 mm (14.0 in) | 2003 | 166.5 mm (6.6 in) | 67 |
| Longest dry spell (CDD) | 93 days | 2017 | 25 days | 67 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1960 | 28.9 C (84.0 F) |
| 1961 | 37.2 C (99.0 F) |
| 1962 | 33.3 C (91.9 F) |
| 1963 | 35.6 C (96.1 F) |
| 1964 | 31.7 C (89.1 F) |
| 1965 | 37.8 C (100.0 F) |
| 1966 | 32.2 C (90.0 F) |
| 1967 | 38.3 C (100.9 F) |
| 1968 | 35.0 C (95.0 F) |
| 1969 | 33.3 C (91.9 F) |
| 1970 | 37.2 C (99.0 F) |
| 1971 | 36.7 C (98.1 F) |
| 1972 | 36.1 C (97.0 F) |
| 1973 | 36.1 C (97.0 F) |
| 1974 | 34.4 C (93.9 F) |
| 1975 | 36.7 C (98.1 F) |
| 1976 | 31.7 C (89.1 F) |
| 1977 | 37.8 C (100.0 F) |
| 1978 | 37.8 C (100.0 F) |
| 1979 | 36.1 C (97.0 F) |
| 1980 | 35.0 C (95.0 F) |
| 1981 | 36.7 C (98.1 F) |
| 1982 | 33.9 C (93.0 F) |
| 1983 | 36.1 C (97.0 F) |
| 1984 | 35.0 C (95.0 F) |
| 1985 | 36.7 C (98.1 F) |
| 1986 | 37.8 C (100.0 F) |
| 1987 | 35.6 C (96.1 F) |
| 1988 | 36.1 C (97.0 F) |
| 1989 | 33.9 C (93.0 F) |
| 1990 | 38.3 C (100.9 F) |
| 1991 | 35.6 C (96.1 F) |
| 1992 | 36.7 C (98.1 F) |
| 1993 | 32.8 C (91.0 F) |
| 1994 | 37.2 C (99.0 F) |
| 1995 | 35.6 C (96.1 F) |
| 1996 | 36.7 C (98.1 F) |
| 1997 | 33.3 C (91.9 F) |
| 1998 | 38.3 C (100.9 F) |
| 1999 | 32.2 C (90.0 F) |
| 2000 | 33.3 C (91.9 F) |
| 2001 | 35.0 C (95.0 F) |
| 2002 | 35.6 C (96.1 F) |
| 2003 | 37.8 C (100.0 F) |
| 2004 | 37.8 C (100.0 F) |
| 2005 | 34.4 C (93.9 F) |
| 2006 | 39.4 C (102.9 F) |
| 2007 | 35.0 C (95.0 F) |
| 2008 | 37.8 C (100.0 F) |
| 2009 | 35.0 C (95.0 F) |
| 2010 | 35.0 C (95.0 F) |
| 2011 | 34.4 C (93.9 F) |
| 2012 | 36.7 C (98.1 F) |
| 2013 | 37.8 C (100.0 F) |
| 2014 | 37.2 C (99.0 F) |
| 2015 | 38.3 C (100.9 F) |
| 2016 | 35.6 C (96.1 F) |
| 2017 | 36.7 C (98.1 F) |
| 2018 | 38.9 C (102.0 F) |
| 2019 | 34.4 C (93.9 F) |
| 2020 | 38.9 C (102.0 F) |
| 2021 | 42.2 C (108.0 F) |
| 2022 | 38.9 C (102.0 F) |
| 2023 | 38.3 C (100.9 F) |
| 2024 | 37.2 C (99.0 F) |
| 2025 | 36.1 C (97.0 F) |
| 2026 | 38.9 C (102.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1960 | -6.1 C (21.0 F) |
| 1961 | -10.6 C (12.9 F) |
| 1962 | -12.8 C (9.0 F) |
| 1963 | -16.1 C (3.0 F) |
| 1964 | -15.6 C (3.9 F) |
| 1965 | -7.8 C (18.0 F) |
| 1966 | -10.0 C (14.0 F) |
| 1967 | -10.6 C (12.9 F) |
| 1968 | -11.7 C (10.9 F) |
| 1969 | -16.1 C (3.0 F) |
| 1970 | -11.1 C (12.0 F) |
| 1971 | -15.0 C (5.0 F) |
| 1972 | -15.0 C (5.0 F) |
| 1973 | -13.9 C (7.0 F) |
| 1974 | -10.0 C (14.0 F) |
| 1975 | -12.2 C (10.0 F) |
| 1976 | -10.6 C (12.9 F) |
| 1977 | -10.0 C (14.0 F) |
| 1978 | -18.3 C (-0.9 F) |
| 1979 | -18.3 C (-0.9 F) |
| 1980 | -15.6 C (3.9 F) |
| 1981 | -10.0 C (14.0 F) |
| 1982 | -15.6 C (3.9 F) |
| 1983 | -15.0 C (5.0 F) |
| 1984 | -12.2 C (10.0 F) |
| 1985 | -13.9 C (7.0 F) |
| 1986 | -11.7 C (10.9 F) |
| 1987 | -7.8 C (18.0 F) |
| 1988 | -12.8 C (9.0 F) |
| 1989 | -16.1 C (3.0 F) |
| 1990 | -15.0 C (5.0 F) |
| 1991 | -11.1 C (12.0 F) |
| 1992 | -12.2 C (10.0 F) |
| 1993 | -13.3 C (8.1 F) |
| 1994 | -11.1 C (12.0 F) |
| 1995 | -10.6 C (12.9 F) |
| 1996 | -15.0 C (5.0 F) |
| 1997 | -13.3 C (8.1 F) |
| 1998 | -13.9 C (7.0 F) |
| 1999 | -6.7 C (19.9 F) |
| 2000 | -9.4 C (15.1 F) |
| 2001 | -7.8 C (18.0 F) |
| 2002 | -8.3 C (17.1 F) |
| 2003 | -8.3 C (17.1 F) |
| 2004 | -17.2 C (1.0 F) |
| 2005 | -9.4 C (15.1 F) |
| 2006 | -13.9 C (7.0 F) |
| 2007 | -11.7 C (10.9 F) |
| 2008 | -15.6 C (3.9 F) |
| 2009 | -12.2 C (10.0 F) |
| 2010 | -13.9 C (7.0 F) |
| 2011 | -13.3 C (8.1 F) |
| 2012 | -13.3 C (8.1 F) |
| 2013 | -12.8 C (9.0 F) |
| 2014 | -11.1 C (12.0 F) |
| 2015 | -6.1 C (21.0 F) |
| 2016 | -13.3 C (8.1 F) |
| 2017 | -12.8 C (9.0 F) |
| 2018 | -11.1 C (12.0 F) |
| 2019 | -12.2 C (10.0 F) |
| 2020 | -12.8 C (9.0 F) |
| 2021 | -13.3 C (8.1 F) |
| 2022 | -14.4 C (6.1 F) |
| 2023 | -10.6 C (12.9 F) |
| 2024 | -13.3 C (8.1 F) |
| 2025 | -12.2 C (10.0 F) |
| 2026 | -7.2 C (19.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1960 | 66.0 mm (2.6 in) |
| 1961 | 72.4 mm (2.9 in) |
| 1962 | 112.3 mm (4.4 in) |
| 1963 | 82.3 mm (3.2 in) |
| 1964 | 49.3 mm (1.9 in) |
| 1965 | 49.5 mm (1.9 in) |
| 1966 | 68.3 mm (2.7 in) |
| 1967 | 74.4 mm (2.9 in) |
| 1968 | 59.4 mm (2.3 in) |
| 1969 | 48.5 mm (1.9 in) |
| 1970 | 52.1 mm (2.1 in) |
| 1971 | 89.2 mm (3.5 in) |
| 1972 | 89.7 mm (3.5 in) |
| 1973 | 69.1 mm (2.7 in) |
| 1974 | 68.1 mm (2.7 in) |
| 1975 | 104.1 mm (4.1 in) |
| 1976 | 48.3 mm (1.9 in) |
| 1977 | 61.5 mm (2.4 in) |
| 1978 | 66.3 mm (2.6 in) |
| 1979 | 74.7 mm (2.9 in) |
| 1980 | 115.3 mm (4.5 in) |
| 1981 | 50.0 mm (2.0 in) |
| 1982 | 58.4 mm (2.3 in) |
| 1983 | 92.7 mm (3.6 in) |
| 1984 | 77.2 mm (3.0 in) |
| 1985 | 65.0 mm (2.6 in) |
| 1986 | 91.4 mm (3.6 in) |
| 1987 | 63.0 mm (2.5 in) |
| 1988 | 70.9 mm (2.8 in) |
| 1989 | 81.5 mm (3.2 in) |
| 1990 | 105.7 mm (4.2 in) |
| 1991 | 71.6 mm (2.8 in) |
| 1992 | 58.9 mm (2.3 in) |
| 1993 | 57.9 mm (2.3 in) |
| 1994 | 81.3 mm (3.2 in) |
| 1995 | 136.1 mm (5.4 in) |
| 1996 | 56.1 mm (2.2 in) |
| 1997 | 78.5 mm (3.1 in) |
| 1998 | 64.8 mm (2.6 in) |
| 1999 | 90.9 mm (3.6 in) |
| 2000 | 53.6 mm (2.1 in) |
| 2001 | 73.7 mm (2.9 in) |
| 2002 | 137.7 mm (5.4 in) |
| 2003 | 174.0 mm (6.9 in) |
| 2004 | 83.6 mm (3.3 in) |
| 2005 | 76.2 mm (3.0 in) |
| 2006 | 105.7 mm (4.2 in) |
| 2007 | 90.7 mm (3.6 in) |
| 2008 | 58.2 mm (2.3 in) |
| 2009 | 104.9 mm (4.1 in) |
| 2010 | 70.1 mm (2.8 in) |
| 2011 | 73.7 mm (2.9 in) |
| 2012 | 46.5 mm (1.8 in) |
| 2013 | 76.5 mm (3.0 in) |
| 2014 | 84.6 mm (3.3 in) |
| 2015 | 85.1 mm (3.4 in) |
| 2016 | 85.9 mm (3.4 in) |
| 2017 | 93.5 mm (3.7 in) |
| 2018 | 48.8 mm (1.9 in) |
| 2019 | 71.1 mm (2.8 in) |
| 2020 | 94.0 mm (3.7 in) |
| 2021 | 99.6 mm (3.9 in) |
| 2022 | 66.3 mm (2.6 in) |
| 2023 | 99.3 mm (3.9 in) |
| 2024 | 50.0 mm (2.0 in) |
| 2025 | 119.9 mm (4.7 in) |
| 2026 | 47.2 mm (1.9 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1960 | 142.9 mm (5.6 in) |
| 1961 | 142.5 mm (5.6 in) |
| 1962 | 140.2 mm (5.5 in) |
| 1963 | 192.1 mm (7.6 in) |
| 1964 | 112.3 mm (4.4 in) |
| 1965 | 135.0 mm (5.3 in) |
| 1966 | 166.5 mm (6.6 in) |
| 1967 | 145.8 mm (5.7 in) |
| 1968 | 119.4 mm (4.7 in) |
| 1969 | 105.0 mm (4.1 in) |
| 1970 | 103.1 mm (4.1 in) |
| 1971 | 158.2 mm (6.2 in) |
| 1972 | 187.2 mm (7.4 in) |
| 1973 | 110.0 mm (4.3 in) |
| 1974 | 227.3 mm (8.9 in) |
| 1975 | 321.0 mm (12.6 in) |
| 1976 | 99.6 mm (3.9 in) |
| 1977 | 158.2 mm (6.2 in) |
| 1978 | 128.5 mm (5.1 in) |
| 1979 | 239.4 mm (9.4 in) |
| 1980 | 203.7 mm (8.0 in) |
| 1981 | 179.6 mm (7.1 in) |
| 1982 | 158.7 mm (6.2 in) |
| 1983 | 214.9 mm (8.5 in) |
| 1984 | 184.9 mm (7.3 in) |
| 1985 | 168.8 mm (6.6 in) |
| 1986 | 234.9 mm (9.2 in) |
| 1987 | 104.1 mm (4.1 in) |
| 1988 | 135.4 mm (5.3 in) |
| 1989 | 196.1 mm (7.7 in) |
| 1990 | 224.6 mm (8.8 in) |
| 1991 | 155.5 mm (6.1 in) |
| 1992 | 133.6 mm (5.3 in) |
| 1993 | 98.6 mm (3.9 in) |
| 1994 | 163.3 mm (6.4 in) |
| 1995 | 238.7 mm (9.4 in) |
| 1996 | 198.6 mm (7.8 in) |
| 1997 | 170.7 mm (6.7 in) |
| 1998 | 204.6 mm (8.1 in) |
| 1999 | 197.0 mm (7.8 in) |
| 2000 | 92.7 mm (3.6 in) |
| 2001 | 195.8 mm (7.7 in) |
| 2002 | 213.4 mm (8.4 in) |
| 2003 | 355.1 mm (14.0 in) |
| 2004 | 153.8 mm (6.1 in) |
| 2005 | 172.8 mm (6.8 in) |
| 2006 | 306.2 mm (12.1 in) |
| 2007 | 164.7 mm (6.5 in) |
| 2008 | 104.9 mm (4.1 in) |
| 2009 | 234.6 mm (9.2 in) |
| 2010 | 194.8 mm (7.7 in) |
| 2011 | 185.9 mm (7.3 in) |
| 2012 | 132.3 mm (5.2 in) |
| 2013 | 137.5 mm (5.4 in) |
| 2014 | 247.9 mm (9.8 in) |
| 2015 | 218.3 mm (8.6 in) |
| 2016 | 130.6 mm (5.1 in) |
| 2017 | 193.1 mm (7.6 in) |
| 2018 | 115.1 mm (4.5 in) |
| 2019 | 160.4 mm (6.3 in) |
| 2020 | 168.9 mm (6.6 in) |
| 2021 | 240.0 mm (9.4 in) |
| 2022 | 133.8 mm (5.3 in) |
| 2023 | 239.8 mm (9.4 in) |
| 2024 | 94.7 mm (3.7 in) |
| 2025 | 275.8 mm (10.9 in) |
| 2026 | 125.2 mm (4.9 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1960 | 14 days |
| 1961 | 20 days |
| 1962 | 15 days |
| 1963 | 27 days |
| 1964 | 11 days |
| 1965 | 34 days |
| 1966 | 16 days |
| 1967 | 25 days |
| 1968 | 24 days |
| 1969 | 45 days |
| 1970 | 40 days |
| 1971 | 43 days |
| 1972 | 33 days |
| 1973 | 42 days |
| 1974 | 31 days |
| 1975 | 26 days |
| 1976 | 18 days |
| 1977 | 36 days |
| 1978 | 19 days |
| 1979 | 37 days |
| 1980 | 17 days |
| 1981 | 34 days |
| 1982 | 18 days |
| 1983 | 25 days |
| 1984 | 31 days |
| 1985 | 32 days |
| 1986 | 58 days |
| 1987 | 19 days |
| 1988 | 21 days |
| 1989 | 20 days |
| 1990 | 22 days |
| 1991 | 32 days |
| 1992 | 32 days |
| 1993 | 16 days |
| 1994 | 33 days |
| 1995 | 24 days |
| 1996 | 25 days |
| 1997 | 27 days |
| 1998 | 27 days |
| 1999 | 17 days |
| 2000 | 20 days |
| 2001 | 22 days |
| 2002 | 25 days |
| 2003 | 28 days |
| 2004 | 24 days |
| 2005 | 24 days |
| 2006 | 33 days |
| 2007 | 25 days |
| 2008 | 25 days |
| 2009 | 41 days |
| 2010 | 16 days |
| 2011 | 27 days |
| 2012 | 36 days |
| 2013 | 17 days |
| 2014 | 20 days |
| 2015 | 26 days |
| 2016 | 22 days |
| 2017 | 93 days |
| 2018 | 28 days |
| 2019 | 21 days |
| 2020 | 24 days |
| 2021 | 23 days |
| 2022 | 48 days |
| 2023 | 24 days |
| 2024 | 29 days |
| 2025 | 29 days |
| 2026 | 29 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
60 years with a frostAcross 60 years with a frost, the median last spring frost at Ross Dam falls on 14 April and the median first autumn frost on 8 November, which leaves a median of 207 days between them.
In 1995 to 2025 the median growing season was 213 days. That is 10 days more than in 1961 to 1994.
Fitted over all years, the growing season changes by +2.1 days per decade at this station.
| Measure | Median, all years | Earliest period (1961 to 1994) | Recent period (1995 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 14 April | 15 April | 14 April | 1 day earlier | -2.2 days per decade |
| First autumn frost | 8 November | 9 November | 8 November | 1 day earlier | -0.1 days per decade |
| Growing days | 207 days | 203 days | 213 days | 10 days more | +2.1 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
64 years, 1961 to 2025A day with at least 73.9 mm (2.9 in) of rain is expected about once in 2 years. A day with at least 160.2 mm (6.3 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 73.9 mm (2.9 in) | |
| 5 years | 95.2 mm (3.7 in) | |
| 10 years | 110.0 mm (4.3 in) | |
| 25 years | 129.5 mm (5.1 in) | |
| 50 years | 144.6 mm (5.7 in) | |
| 100 years | 160.2 mm (6.3 in) | Longer than the 64 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, 64 years of values from 1961 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: 174.0 mm (6.9 in) in 2003; 137.7 mm (5.4 in) in 2002; 136.1 mm (5.4 in) in 1995.
Station Changes
2 suspected2 changes were suspected in the annual mean temperature of Ross Dam, at 1981 and 2010. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1981 ran 0.1 C (0.2 F) higher than in the years before (possible change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 2010 ran 0.3 C (0.5 F) lower than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1981 | +0.1 | +0.2 | possible | 5 |
| 2010 | -0.3 | -0.5 | 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
2011 to 2025 against 1961 to 1990Over 2011 to 2025, Ross Dam had a mean temperature of 9.6 C (49.3 F) and 1,560.3 mm (61.4 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Blowing Rock 1NW (United States, 3,472 km away), Ogulin (Croatia, 8,744 km away) and Postojna (Slovenia, 8,646 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Blowing Rock 1NW | United States | 3,472 km (2,157 mi) | 9.5 C (49.1 F) | 1,621.8 mm (63.9 in) | 1.21 |
| Ogulin | Croatia | 8,744 km (5,433 mi) | 9.9 C (49.8 F) | 1,577.2 mm (62.1 in) | 1.21 |
| Postojna | Slovenia | 8,646 km (5,372 mi) | 8.6 C (47.6 F) | 1,571.6 mm (61.9 in) | 1.41 |
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).