Owyhee Dam Weather Records (USC00356405)
Record envelope, standing records and threshold days for Owyhee Dam (USC00356405), Oregon, United States, with 92 years of record.
Key Facts for Owyhee Dam
- Owyhee Dam (USC00356405) is a weather station in Oregon, United States at 43.65 latitude and -117.25 longitude, 732 m (2,400 ft) above sea level.
- The station reports from 1935 to 2026, 92 years of record.
- 1,464 records set at Owyhee Dam still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Owyhee Dam tied a daily record high maximum temperature of 31.1 C (88.0 F) on 10 October 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Oregon, United States, 43.65 latitude, -117.25 longitude.
- Elevation: 732 m (2,400 ft).
- Period of record: 1935 to 2026, 92 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
15 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 19.4 C (66.9 F) | -30.0 C (-22.0 F) | 12.2 C (54.0 F) | -8.9 C (16.0 F) |
| Feb | 21.1 C (70.0 F) | -25.0 C (-13.0 F) | 18.9 C (66.0 F) | -5.6 C (21.9 F) |
| Mar | 28.3 C (82.9 F) | -11.7 C (10.9 F) | 28.3 C (82.9 F) | -3.3 C (26.1 F) |
| Apr | 33.3 C (91.9 F) | -10.0 C (14.0 F) | 25.6 C (78.1 F) | -1.7 C (28.9 F) |
| May | 38.9 C (102.0 F) | -4.4 C (24.1 F) | 34.4 C (93.9 F) | 2.8 C (37.0 F) |
| Jun | 43.3 C (109.9 F) | 1.1 C (34.0 F) | 38.3 C (100.9 F) | 2.8 C (37.0 F) |
| Jul | 44.4 C (111.9 F) | 1.7 C (35.1 F) | 40.0 C (104.0 F) | 10.6 C (51.1 F) |
| Aug | 43.9 C (111.0 F) | 1.7 C (35.1 F) | 39.4 C (102.9 F) | 5.6 C (42.1 F) |
| Sep | 39.4 C (102.9 F) | -2.8 C (27.0 F) | 33.3 C (91.9 F) | 2.2 C (36.0 F) |
| Oct | 33.9 C (93.0 F) | -11.7 C (10.9 F) | 31.1 C (88.0 F) | 5.6 C (42.1 F) |
| Nov | 26.7 C (80.1 F) | -20.0 C (-4.0 F) | n/a | n/a |
| Dec | 21.1 C (70.0 F) | -26.7 C (-16.1 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1935 | 18 |
| 1936 | 21 |
| 1937 | 16 |
| 1938 | 8 |
| 1939 | 15 |
| 1940 | 15 |
| 1941 | 11 |
| 1942 | 17 |
| 1943 | 15 |
| 1944 | 7 |
| 1945 | 5 |
| 1946 | 9 |
| 1947 | 15 |
| 1948 | 14 |
| 1949 | 23 |
| 1950 | 16 |
| 1951 | 2 |
| 1952 | 9 |
| 1953 | 16 |
| 1954 | 17 |
| 1955 | 25 |
| 1956 | 13 |
| 1957 | 16 |
| 1958 | 8 |
| 1959 | 8 |
| 1960 | 14 |
| 1961 | 25 |
| 1962 | 21 |
| 1963 | 16 |
| 1964 | 26 |
| 1965 | 19 |
| 1966 | 22 |
| 1967 | 16 |
| 1968 | 22 |
| 1969 | 11 |
| 1970 | 10 |
| 1971 | 23 |
| 1972 | 34 |
| 1973 | 6 |
| 1974 | 20 |
| 1975 | 21 |
| 1976 | 15 |
| 1977 | 19 |
| 1978 | 11 |
| 1979 | 12 |
| 1980 | 18 |
| 1981 | 13 |
| 1982 | 11 |
| 1983 | 9 |
| 1984 | 9 |
| 1985 | 32 |
| 1986 | 32 |
| 1987 | 29 |
| 1988 | 16 |
| 1989 | 22 |
| 1990 | 33 |
| 1991 | 16 |
| 1992 | 26 |
| 1993 | 24 |
| 1994 | 13 |
| 1995 | 14 |
| 1996 | 18 |
| 1997 | 12 |
| 1998 | 5 |
| 1999 | 13 |
| 2000 | 6 |
| 2001 | 11 |
| 2002 | 17 |
| 2003 | 28 |
| 2004 | 7 |
| 2005 | 9 |
| 2006 | 18 |
| 2007 | 12 |
| 2008 | 20 |
| 2009 | 29 |
| 2010 | 13 |
| 2011 | 6 |
| 2012 | 12 |
| 2013 | 12 |
| 2014 | 17 |
| 2015 | 29 |
| 2016 | 12 |
| 2017 | 21 |
| 2018 | 14 |
| 2019 | 18 |
| 2020 | 10 |
| 2021 | 8 |
| 2022 | 20 |
| 2023 | 16 |
| 2024 | 12 |
| 2025 | 10 |
| 2026 | 10 |
All-Time Record Progression
9 new records| Date | Kind | Detail |
|---|---|---|
| 1990-07-12 | Record high minimum temperature | Record high minimum temperature 25.0 C (77.0 F) |
| 1990-12-23 | Record low maximum temperature | Record low maximum temperature -16.1 C (3.0 F) |
| 1990-12-24 | Record low maximum temperature | Record low maximum temperature -18.3 C (-0.9 F) |
| 1992-08-15 | Record high minimum temperature | Record high minimum temperature 26.1 C (79.0 F) |
| 2002-07-12 | Record high maximum temperature | Record high maximum temperature 44.4 C (111.9 F) |
| 2010-12-01 | Record daily snowfall | Record daily snowfall 20.6 cm (8.1 in) |
| 2017-01-05 | Record snow depth | Record snow depth 35.6 cm (14.0 in) |
| 2017-01-08 | Record snow depth | Record snow depth 40.6 cm (16.0 in) |
| 2017-01-19 | Record snow depth | Record snow depth 45.7 cm (18.0 in) |
Wettest Day of Each Month
Sep: 62.5 mm (2.5 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 27.9 mm (1.1 in) | 21 January 1969 |
| Feb | 20.3 mm (0.8 in) | 13 February 1986 |
| Mar | 24.1 mm (0.9 in) | 26 March 1945 |
| Apr | 31.5 mm (1.2 in) | 13 April 2026 |
| May | 41.9 mm (1.6 in) | 12 May 1957 |
| Jun | 57.7 mm (2.3 in) | 13 June 2019 |
| Jul | 31.0 mm (1.2 in) | 11 July 2016 |
| Aug | 47.0 mm (1.9 in) | 14 August 1979 |
| Sep | 62.5 mm (2.5 in) | 29 September 1949 |
| Oct | 30.0 mm (1.2 in) | 31 October 1991 |
| Nov | 18.0 mm (0.7 in) | 19 November 1937 |
| Dec | 50.8 mm (2.0 in) | 3 December 2025 |
Period of Record Coverage
1935 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1935 | 321 | 88% | No |
| 1936 | 340 | 93% | Yes |
| 1937 | 361 | 99% | Yes |
| 1938 | 363 | 99% | Yes |
| 1939 | 361 | 99% | Yes |
| 1940 | 365 | 100% | Yes |
| 1941 | 362 | 99% | Yes |
| 1942 | 364 | 100% | Yes |
| 1943 | 365 | 100% | Yes |
| 1944 | 364 | 99% | Yes |
| 1945 | 365 | 100% | Yes |
| 1946 | 363 | 99% | Yes |
| 1947 | 363 | 99% | Yes |
| 1948 | 363 | 99% | Yes |
| 1949 | 364 | 100% | Yes |
| 1950 | 362 | 99% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 364 | 99% | Yes |
| 1953 | 362 | 99% | Yes |
| 1954 | 363 | 99% | Yes |
| 1955 | 364 | 100% | Yes |
| 1956 | 362 | 99% | Yes |
| 1957 | 358 | 98% | Yes |
| 1958 | 363 | 99% | Yes |
| 1959 | 357 | 98% | Yes |
| 1960 | 365 | 100% | Yes |
| 1961 | 363 | 99% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 364 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 364 | 100% | Yes |
| 1968 | 364 | 99% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 364 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 362 | 99% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 365 | 100% | Yes |
| 1977 | 364 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 365 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 361 | 99% | Yes |
| 1983 | 365 | 100% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 364 | 100% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 364 | 100% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 364 | 100% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 366 | 100% | Yes |
| 1993 | 365 | 100% | Yes |
| 1994 | 365 | 100% | Yes |
| 1995 | 334 | 92% | Yes |
| 1996 | 305 | 83% | No |
| 1997 | 364 | 100% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 332 | 91% | Yes |
| 2000 | 365 | 100% | Yes |
| 2001 | 333 | 91% | Yes |
| 2002 | 365 | 100% | Yes |
| 2003 | 365 | 100% | Yes |
| 2004 | 365 | 100% | Yes |
| 2005 | 365 | 100% | Yes |
| 2006 | 362 | 99% | Yes |
| 2007 | 364 | 100% | Yes |
| 2008 | 335 | 92% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 364 | 100% | Yes |
| 2011 | 355 | 97% | Yes |
| 2012 | 360 | 98% | Yes |
| 2013 | 362 | 99% | Yes |
| 2014 | 267 | 73% | No |
| 2015 | 364 | 100% | Yes |
| 2016 | 363 | 99% | Yes |
| 2017 | 364 | 100% | Yes |
| 2018 | 364 | 100% | Yes |
| 2019 | 365 | 100% | Yes |
| 2020 | 365 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 362 | 99% | Yes |
| 2023 | 361 | 99% | Yes |
| 2024 | 320 | 87% | No |
| 2025 | 263 | 72% | No |
| 2026 | 264 | 72% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 10 October 2026 | Owyhee Dam, US | daily high max (Tie, Provisional) | 31.1 C (88.0 F) | tie | 11 years | 3 of 100 (Routine) |
| 8 October 2026 | Owyhee Dam, US | daily high max (Provisional) | 31.1 C (88.0 F) | 0.5 C (0.9 F) | 72 years | 30 of 100 (Routine) |
| 7 October 2026 | Owyhee Dam, US | daily high max (Tie, Provisional) | 31.1 C (88.0 F) | tie | 23 years | 3 of 100 (Routine) |
| 6 October 2026 | Owyhee Dam, US | daily high max (Tie, Provisional) | 31.1 C (88.0 F) | tie | 1 year | 2 of 100 (Routine) |
| 9 September 2026 | Owyhee Dam, US | daily low min (Provisional) | 2.2 C (36.0 F) | 0.6 C (1.1 F) | 55 years | 26 of 100 (Routine) |
| 8 September 2026 | Owyhee Dam, US | daily low max (Provisional) | 13.3 C (55.9 F) | 2.3 C (4.1 F) | 48 years | 27 of 100 (Routine) |
| 7 September 2026 | Owyhee Dam, US | daily low max (Provisional) | 12.8 C (55.0 F) | 6.6 C (11.9 F) | 80 years | 45 of 100 (Notable) |
| 5 September 2026 | Owyhee Dam, US | daily rain (Provisional) | 9.1 mm (0.36 in) | 6.8 mm (0.27 in) | 80 years | 20 of 100 (Routine) |
| 5 September 2026 | Owyhee Dam, US | daily low max (Provisional) | 17.8 C (64.0 F) | 1.6 C (2.9 F) | 85 years | 37 of 100 (Notable) |
| 27 August 2026 | Owyhee Dam, US | daily high max (Tie, Provisional) | 38.3 C (100.9 F) | tie | 29 years | 4 of 100 (Routine) |
| 22 July 2026 | Owyhee Dam, US | daily high min | 21.7 C (71.1 F) | 1.1 C (2.0 F) | 89 years | 38 of 100 (Notable) |
| 14 July 2026 | Owyhee Dam, US | daily high min | 22.2 C (72.0 F) | 0.5 C (0.9 F) | 1 year | 10 of 100 (Routine) |
| 29 June 2026 | Owyhee Dam, US | daily low max | 18.3 C (64.9 F) | 2.3 C (4.1 F) | 55 years | 29 of 100 (Routine) |
| 11 June 2026 | Owyhee Dam, US | daily low min (Tie) | 3.3 C (37.9 F) | tie | 27 years | 4 of 100 (Routine) |
| 15 May 2026 | Owyhee Dam, US | daily high max | 34.4 C (93.9 F) | 1.1 C (2.0 F) | 87 years | 37 of 100 (Notable) |
| 22 April 2026 | Owyhee Dam, US | daily rain | 10.9 mm (0.4 in) | 2.8 mm (0.11 in) | 23 years | 20 of 100 (Routine) |
| 14 April 2026 | Owyhee Dam, US | daily rain | 11.4 mm (0.4 in) | 0.5 mm (0.02 in) | 8 years | 12 of 100 (Routine) |
| 13 April 2026 | Owyhee Dam, US | monthly rain | 31.5 mm (1.2 in) | 7.6 mm (0.30 in) | 44 years | 55 of 100 (Notable) |
| 28 March 2026 | Owyhee Dam, US | daily high max (Tie) | 25.6 C (78.1 F) | tie | 83 years | 8 of 100 (Routine) |
| 26 March 2026 | Owyhee Dam, US | daily high max | 25.6 C (78.1 F) | 2.3 C (4.1 F) | 60 years | 32 of 100 (Routine) |
Climate Trend
80 complete years, 1937 to 2023| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1937 | 10.8 C | -0.32 C |
| 1938 | 11.5 C | +0.33 C |
| 1939 | 12.0 C | +0.86 C |
| 1940 | 12.3 C | +1.12 C |
| 1941 | 11.6 C | +0.40 C |
| 1942 | 10.8 C | -0.31 C |
| 1943 | 11.1 C | -0.08 C |
| 1944 | 10.5 C | -0.62 C |
| 1945 | 11.4 C | +0.22 C |
| 1946 | 11.6 C | +0.40 C |
| 1947 | 11.6 C | +0.49 C |
| 1948 | 11.4 C | +0.27 C |
| 1949 | 11.3 C | +0.14 C |
| 1950 | 11.4 C | +0.25 C |
| 1951 | 11.1 C | -0.05 C |
| 1952 | 11.4 C | +0.27 C |
| 1953 | 12.3 C | +1.12 C |
| 1955 | 10.8 C | -0.33 C |
| 1956 | 10.7 C | -0.49 C |
| 1957 | 10.3 C | -0.85 C |
| 1958 | 12.1 C | +0.96 C |
| 1959 | 11.5 C | +0.32 C |
| 1960 | 10.9 C | -0.21 C |
| 1961 | 12.2 C | +1.03 C |
| 1962 | 11.2 C | +0.01 C |
| 1963 | 11.8 C | +0.60 C |
| 1964 | 10.6 C | -0.60 C |
| 1965 | 11.3 C | +0.15 C |
| 1966 | 12.2 C | +1.00 C |
| 1967 | 12.1 C | +0.92 C |
| 1968 | 11.6 C | +0.44 C |
| 1969 | 11.4 C | +0.26 C |
| 1970 | 11.6 C | +0.48 C |
| 1971 | 10.6 C | -0.60 C |
| 1972 | 10.2 C | -0.92 C |
| 1973 | 11.1 C | -0.07 C |
| 1974 | 10.8 C | -0.31 C |
| 1975 | 9.7 C | -1.43 C |
| 1976 | 9.7 C | -1.45 C |
| 1977 | 10.6 C | -0.55 C |
| 1978 | 10.4 C | -0.73 C |
| 1979 | 10.1 C | -1.04 C |
| 1980 | 10.6 C | -0.53 C |
| 1981 | 11.2 C | +0.01 C |
| 1982 | 9.7 C | -1.49 C |
| 1983 | 10.6 C | -0.52 C |
| 1984 | 9.6 C | -1.51 C |
| 1985 | 8.8 C | -2.34 C |
| 1986 | 11.6 C | +0.42 C |
| 1987 | 11.7 C | +0.58 C |
| 1988 | 11.9 C | +0.72 C |
| 1989 | 10.4 C | -0.74 C |
| 1990 | 11.6 C | +0.49 C |
| 1991 | 11.1 C | -0.02 C |
| 1992 | 12.3 C | +1.12 C |
| 1993 | 9.5 C | -1.70 C |
| 1994 | 11.7 C | +0.50 C |
| 1997 | 11.4 C | +0.26 C |
| 1998 | 11.8 C | +0.67 C |
| 2000 | 11.3 C | +0.13 C |
| 2002 | 11.1 C | -0.01 C |
| 2003 | 12.6 C | +1.41 C |
| 2004 | 11.8 C | +0.69 C |
| 2005 | 10.8 C | -0.33 C |
| 2006 | 11.5 C | +0.35 C |
| 2007 | 11.5 C | +0.32 C |
| 2009 | 10.0 C | -1.13 C |
| 2010 | 10.5 C | -0.64 C |
| 2011 | 10.5 C | -0.69 C |
| 2012 | 11.9 C | +0.73 C |
| 2013 | 11.0 C | -0.18 C |
| 2015 | 12.7 C | +1.59 C |
| 2016 | 11.8 C | +0.64 C |
| 2017 | 10.9 C | -0.28 C |
| 2018 | 10.9 C | -0.23 C |
| 2019 | 9.9 C | -1.27 C |
| 2020 | 11.7 C | +0.50 C |
| 2021 | 12.6 C | +1.49 C |
| 2022 | 11.0 C | -0.20 C |
| 2023 | 11.4 C | +0.23 C |
The fitted trend in annual mean temperature here over 1937 to 2023 is -0.01 C (-0.08 to 0.06) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.02 F (-0.15 to 0.10) per decade. The slope is a straight line fitted to 80 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | -0.01 C (-0.08 to 0.06) per decade | -0.02 F (-0.15 to 0.10) per decade | 1937 to 2023 | 80 | Not clearly different from zero |
| Mean daily maximum | 0.01 C (-0.06 to 0.09) per decade | 0.03 F (-0.12 to 0.17) per decade | 1937 to 2023 | 80 | Not clearly different from zero |
| Mean daily minimum | -0.04 C (-0.11 to 0.03) per decade | -0.1 F (-0.2 to 0.1) per decade | 1937 to 2023 | 80 | 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
1935 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 44.4 C (111.9 F) | 2002 | 40.6 C (105.1 F) | 92 |
| Coldest night (TNn) | -30.0 C (-22.0 F) | 1962 | -15.6 C (3.9 F) | 92 |
| Wettest day (Rx1day) | 62.5 mm (2.5 in) | 1949 | 17.7 mm (0.7 in) | 92 |
| Wettest five days (Rx5day) | 119.4 mm (4.7 in) | 2025 | 29.2 mm (1.1 in) | 92 |
| Longest dry spell (CDD) | 100 days | 1949 | 51 days | 92 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1935 | 42.2 C (108.0 F) |
| 1936 | 42.2 C (108.0 F) |
| 1937 | 41.1 C (106.0 F) |
| 1938 | 39.4 C (102.9 F) |
| 1939 | 41.1 C (106.0 F) |
| 1940 | 43.3 C (109.9 F) |
| 1941 | 39.4 C (102.9 F) |
| 1942 | 42.2 C (108.0 F) |
| 1943 | 39.4 C (102.9 F) |
| 1944 | 38.9 C (102.0 F) |
| 1945 | 38.3 C (100.9 F) |
| 1946 | 41.7 C (107.1 F) |
| 1947 | 39.4 C (102.9 F) |
| 1948 | 39.4 C (102.9 F) |
| 1949 | 42.8 C (109.0 F) |
| 1950 | 39.4 C (102.9 F) |
| 1951 | 40.6 C (105.1 F) |
| 1952 | 38.3 C (100.9 F) |
| 1953 | 41.7 C (107.1 F) |
| 1954 | 39.4 C (102.9 F) |
| 1955 | 42.2 C (108.0 F) |
| 1956 | 39.4 C (102.9 F) |
| 1957 | 37.8 C (100.0 F) |
| 1958 | 39.4 C (102.9 F) |
| 1959 | 41.7 C (107.1 F) |
| 1960 | 43.9 C (111.0 F) |
| 1961 | 43.9 C (111.0 F) |
| 1962 | 40.0 C (104.0 F) |
| 1963 | 38.9 C (102.0 F) |
| 1964 | 38.9 C (102.0 F) |
| 1965 | 38.9 C (102.0 F) |
| 1966 | 39.4 C (102.9 F) |
| 1967 | 41.1 C (106.0 F) |
| 1968 | 40.6 C (105.1 F) |
| 1969 | 41.7 C (107.1 F) |
| 1970 | 40.0 C (104.0 F) |
| 1971 | 40.6 C (105.1 F) |
| 1972 | 40.6 C (105.1 F) |
| 1973 | 39.4 C (102.9 F) |
| 1974 | 40.0 C (104.0 F) |
| 1975 | 39.4 C (102.9 F) |
| 1976 | 37.8 C (100.0 F) |
| 1977 | 40.6 C (105.1 F) |
| 1978 | 40.0 C (104.0 F) |
| 1979 | 40.6 C (105.1 F) |
| 1980 | 41.1 C (106.0 F) |
| 1981 | 38.9 C (102.0 F) |
| 1982 | 38.3 C (100.9 F) |
| 1983 | 40.0 C (104.0 F) |
| 1984 | 39.4 C (102.9 F) |
| 1985 | 39.4 C (102.9 F) |
| 1986 | 38.9 C (102.0 F) |
| 1987 | 39.4 C (102.9 F) |
| 1988 | 40.6 C (105.1 F) |
| 1989 | 41.1 C (106.0 F) |
| 1990 | 42.2 C (108.0 F) |
| 1991 | 38.9 C (102.0 F) |
| 1992 | 41.7 C (107.1 F) |
| 1993 | 37.2 C (99.0 F) |
| 1994 | 41.7 C (107.1 F) |
| 1995 | 40.6 C (105.1 F) |
| 1996 | 40.6 C (105.1 F) |
| 1997 | 39.4 C (102.9 F) |
| 1998 | 41.7 C (107.1 F) |
| 1999 | 40.6 C (105.1 F) |
| 2000 | 41.1 C (106.0 F) |
| 2001 | 42.8 C (109.0 F) |
| 2002 | 44.4 C (111.9 F) |
| 2003 | 43.9 C (111.0 F) |
| 2004 | 41.1 C (106.0 F) |
| 2005 | 40.6 C (105.1 F) |
| 2006 | 43.3 C (109.9 F) |
| 2007 | 43.3 C (109.9 F) |
| 2008 | 40.0 C (104.0 F) |
| 2009 | 40.6 C (105.1 F) |
| 2010 | 40.0 C (104.0 F) |
| 2011 | 38.3 C (100.9 F) |
| 2012 | 40.6 C (105.1 F) |
| 2013 | 42.8 C (109.0 F) |
| 2014 | 41.7 C (107.1 F) |
| 2015 | 42.8 C (109.0 F) |
| 2016 | 40.6 C (105.1 F) |
| 2017 | 43.3 C (109.9 F) |
| 2018 | 42.8 C (109.0 F) |
| 2019 | 38.9 C (102.0 F) |
| 2020 | 41.1 C (106.0 F) |
| 2021 | 41.1 C (106.0 F) |
| 2022 | 42.2 C (108.0 F) |
| 2023 | 41.7 C (107.1 F) |
| 2024 | 42.2 C (108.0 F) |
| 2025 | 40.0 C (104.0 F) |
| 2026 | 40.0 C (104.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1935 | -12.2 C (10.0 F) |
| 1936 | -16.7 C (1.9 F) |
| 1937 | -21.1 C (-6.0 F) |
| 1938 | -11.7 C (10.9 F) |
| 1939 | -9.4 C (15.1 F) |
| 1940 | -15.0 C (5.0 F) |
| 1941 | -11.7 C (10.9 F) |
| 1942 | -16.7 C (1.9 F) |
| 1943 | -19.4 C (-2.9 F) |
| 1944 | -16.7 C (1.9 F) |
| 1945 | -15.6 C (3.9 F) |
| 1946 | -11.1 C (12.0 F) |
| 1947 | -17.8 C (0.0 F) |
| 1948 | -16.1 C (3.0 F) |
| 1949 | -23.3 C (-9.9 F) |
| 1950 | -21.1 C (-6.0 F) |
| 1951 | -16.7 C (1.9 F) |
| 1952 | -15.0 C (5.0 F) |
| 1953 | -8.3 C (17.1 F) |
| 1954 | -12.2 C (10.0 F) |
| 1955 | -20.0 C (-4.0 F) |
| 1956 | -18.9 C (-2.0 F) |
| 1957 | -27.2 C (-17.0 F) |
| 1958 | -11.7 C (10.9 F) |
| 1959 | -13.3 C (8.1 F) |
| 1960 | -15.6 C (3.9 F) |
| 1961 | -15.0 C (5.0 F) |
| 1962 | -30.0 C (-22.0 F) |
| 1963 | -21.1 C (-6.0 F) |
| 1964 | -18.3 C (-0.9 F) |
| 1965 | -12.2 C (10.0 F) |
| 1966 | -11.1 C (12.0 F) |
| 1967 | -16.7 C (1.9 F) |
| 1968 | -13.9 C (7.0 F) |
| 1969 | -14.4 C (6.1 F) |
| 1970 | -12.8 C (9.0 F) |
| 1971 | -12.2 C (10.0 F) |
| 1972 | -26.7 C (-16.1 F) |
| 1973 | -11.7 C (10.9 F) |
| 1974 | -21.1 C (-6.0 F) |
| 1975 | -16.1 C (3.0 F) |
| 1976 | -15.0 C (5.0 F) |
| 1977 | -22.2 C (-8.0 F) |
| 1978 | -22.8 C (-9.0 F) |
| 1979 | -26.1 C (-15.0 F) |
| 1980 | -21.1 C (-6.0 F) |
| 1981 | -10.6 C (12.9 F) |
| 1982 | -18.3 C (-0.9 F) |
| 1983 | -23.9 C (-11.0 F) |
| 1984 | -18.3 C (-0.9 F) |
| 1985 | -21.7 C (-7.1 F) |
| 1986 | -17.2 C (1.0 F) |
| 1987 | -13.9 C (7.0 F) |
| 1988 | -20.0 C (-4.0 F) |
| 1989 | -24.4 C (-11.9 F) |
| 1990 | -26.1 C (-15.0 F) |
| 1991 | -22.8 C (-9.0 F) |
| 1992 | -19.4 C (-2.9 F) |
| 1993 | -17.8 C (0.0 F) |
| 1994 | -13.3 C (8.1 F) |
| 1995 | -16.1 C (3.0 F) |
| 1996 | -15.0 C (5.0 F) |
| 1997 | -12.8 C (9.0 F) |
| 1998 | -20.0 C (-4.0 F) |
| 1999 | -9.4 C (15.1 F) |
| 2000 | -10.0 C (14.0 F) |
| 2001 | -11.1 C (12.0 F) |
| 2002 | -12.8 C (9.0 F) |
| 2003 | -12.8 C (9.0 F) |
| 2004 | -20.0 C (-4.0 F) |
| 2005 | -13.9 C (7.0 F) |
| 2006 | -12.8 C (9.0 F) |
| 2007 | -15.6 C (3.9 F) |
| 2008 | -17.2 C (1.0 F) |
| 2009 | -21.7 C (-7.1 F) |
| 2010 | -12.2 C (10.0 F) |
| 2011 | -15.0 C (5.0 F) |
| 2012 | -12.8 C (9.0 F) |
| 2013 | -21.7 C (-7.1 F) |
| 2014 | -15.6 C (3.9 F) |
| 2015 | -14.4 C (6.1 F) |
| 2016 | -20.0 C (-4.0 F) |
| 2017 | -27.2 C (-17.0 F) |
| 2018 | -14.4 C (6.1 F) |
| 2019 | -13.3 C (8.1 F) |
| 2020 | -12.2 C (10.0 F) |
| 2021 | -9.4 C (15.1 F) |
| 2022 | -14.4 C (6.1 F) |
| 2023 | -13.3 C (8.1 F) |
| 2024 | -25.0 C (-13.0 F) |
| 2025 | -13.3 C (8.1 F) |
| 2026 | -8.9 C (16.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1935 | 9.9 mm (0.39 in) |
| 1936 | 13.7 mm (0.5 in) |
| 1937 | 38.6 mm (1.5 in) |
| 1938 | 16.8 mm (0.7 in) |
| 1939 | 10.9 mm (0.4 in) |
| 1940 | 22.4 mm (0.9 in) |
| 1941 | 13.7 mm (0.5 in) |
| 1942 | 13.5 mm (0.5 in) |
| 1943 | 11.9 mm (0.5 in) |
| 1944 | 16.5 mm (0.6 in) |
| 1945 | 24.1 mm (0.9 in) |
| 1946 | 21.1 mm (0.8 in) |
| 1947 | 10.7 mm (0.4 in) |
| 1948 | 12.4 mm (0.5 in) |
| 1949 | 62.5 mm (2.5 in) |
| 1950 | 18.0 mm (0.7 in) |
| 1951 | 17.5 mm (0.7 in) |
| 1952 | 20.3 mm (0.8 in) |
| 1953 | 23.6 mm (0.9 in) |
| 1954 | 14.7 mm (0.6 in) |
| 1955 | 13.7 mm (0.5 in) |
| 1956 | 16.8 mm (0.7 in) |
| 1957 | 41.9 mm (1.6 in) |
| 1958 | 19.8 mm (0.8 in) |
| 1959 | 25.4 mm (1.0 in) |
| 1960 | 19.1 mm (0.8 in) |
| 1961 | 10.4 mm (0.4 in) |
| 1962 | 17.5 mm (0.7 in) |
| 1963 | 18.3 mm (0.7 in) |
| 1964 | 37.6 mm (1.5 in) |
| 1965 | 36.8 mm (1.4 in) |
| 1966 | 9.1 mm (0.36 in) |
| 1967 | 22.6 mm (0.9 in) |
| 1968 | 24.9 mm (1.0 in) |
| 1969 | 27.9 mm (1.1 in) |
| 1970 | 24.4 mm (1.0 in) |
| 1971 | 19.8 mm (0.8 in) |
| 1972 | 13.7 mm (0.5 in) |
| 1973 | 25.9 mm (1.0 in) |
| 1974 | 11.9 mm (0.5 in) |
| 1975 | 30.7 mm (1.2 in) |
| 1976 | 15.7 mm (0.6 in) |
| 1977 | 16.3 mm (0.6 in) |
| 1978 | 22.1 mm (0.9 in) |
| 1979 | 47.0 mm (1.9 in) |
| 1980 | 22.6 mm (0.9 in) |
| 1981 | 23.9 mm (0.9 in) |
| 1982 | 25.7 mm (1.0 in) |
| 1983 | 15.2 mm (0.6 in) |
| 1984 | 27.7 mm (1.1 in) |
| 1985 | 16.0 mm (0.6 in) |
| 1986 | 20.3 mm (0.8 in) |
| 1987 | 26.4 mm (1.0 in) |
| 1988 | 9.4 mm (0.37 in) |
| 1989 | 16.0 mm (0.6 in) |
| 1990 | 13.0 mm (0.5 in) |
| 1991 | 30.0 mm (1.2 in) |
| 1992 | 13.2 mm (0.5 in) |
| 1993 | 22.1 mm (0.9 in) |
| 1994 | 14.2 mm (0.6 in) |
| 1995 | 16.3 mm (0.6 in) |
| 1996 | 16.5 mm (0.6 in) |
| 1997 | 22.1 mm (0.9 in) |
| 1998 | 26.7 mm (1.1 in) |
| 1999 | 12.2 mm (0.5 in) |
| 2000 | 11.9 mm (0.5 in) |
| 2001 | 16.8 mm (0.7 in) |
| 2002 | 12.4 mm (0.5 in) |
| 2003 | 10.2 mm (0.4 in) |
| 2004 | 15.5 mm (0.6 in) |
| 2005 | 19.3 mm (0.8 in) |
| 2006 | 15.5 mm (0.6 in) |
| 2007 | 19.1 mm (0.8 in) |
| 2008 | 15.2 mm (0.6 in) |
| 2009 | 14.0 mm (0.6 in) |
| 2010 | 18.0 mm (0.7 in) |
| 2011 | 17.0 mm (0.7 in) |
| 2012 | 11.4 mm (0.4 in) |
| 2013 | 16.8 mm (0.7 in) |
| 2014 | 13.7 mm (0.5 in) |
| 2015 | 27.4 mm (1.1 in) |
| 2016 | 31.0 mm (1.2 in) |
| 2017 | 23.6 mm (0.9 in) |
| 2018 | 14.0 mm (0.6 in) |
| 2019 | 57.7 mm (2.3 in) |
| 2020 | 19.6 mm (0.8 in) |
| 2021 | 13.0 mm (0.5 in) |
| 2022 | 26.9 mm (1.1 in) |
| 2023 | 17.3 mm (0.7 in) |
| 2024 | 17.8 mm (0.7 in) |
| 2025 | 50.8 mm (2.0 in) |
| 2026 | 31.5 mm (1.2 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1935 | 18.4 mm (0.7 in) |
| 1936 | 21.6 mm (0.9 in) |
| 1937 | 38.6 mm (1.5 in) |
| 1938 | 29.0 mm (1.1 in) |
| 1939 | 13.8 mm (0.5 in) |
| 1940 | 43.2 mm (1.7 in) |
| 1941 | 21.0 mm (0.8 in) |
| 1942 | 24.1 mm (0.9 in) |
| 1943 | 24.8 mm (1.0 in) |
| 1944 | 33.6 mm (1.3 in) |
| 1945 | 28.9 mm (1.1 in) |
| 1946 | 21.1 mm (0.8 in) |
| 1947 | 30.5 mm (1.2 in) |
| 1948 | 22.1 mm (0.9 in) |
| 1949 | 64.5 mm (2.5 in) |
| 1950 | 31.7 mm (1.2 in) |
| 1951 | 29.4 mm (1.2 in) |
| 1952 | 28.5 mm (1.1 in) |
| 1953 | 29.3 mm (1.2 in) |
| 1954 | 20.8 mm (0.8 in) |
| 1955 | 22.5 mm (0.9 in) |
| 1956 | 42.2 mm (1.7 in) |
| 1957 | 49.8 mm (2.0 in) |
| 1958 | 39.9 mm (1.6 in) |
| 1959 | 36.1 mm (1.4 in) |
| 1960 | 26.7 mm (1.1 in) |
| 1961 | 17.8 mm (0.7 in) |
| 1962 | 42.6 mm (1.7 in) |
| 1963 | 26.6 mm (1.0 in) |
| 1964 | 45.7 mm (1.8 in) |
| 1965 | 56.9 mm (2.2 in) |
| 1966 | 16.6 mm (0.7 in) |
| 1967 | 34.1 mm (1.3 in) |
| 1968 | 46.0 mm (1.8 in) |
| 1969 | 52.3 mm (2.1 in) |
| 1970 | 47.0 mm (1.9 in) |
| 1971 | 25.4 mm (1.0 in) |
| 1972 | 23.6 mm (0.9 in) |
| 1973 | 26.9 mm (1.1 in) |
| 1974 | 12.9 mm (0.5 in) |
| 1975 | 46.4 mm (1.8 in) |
| 1976 | 26.4 mm (1.0 in) |
| 1977 | 25.9 mm (1.0 in) |
| 1978 | 53.3 mm (2.1 in) |
| 1979 | 53.7 mm (2.1 in) |
| 1980 | 32.2 mm (1.3 in) |
| 1981 | 33.1 mm (1.3 in) |
| 1982 | 48.0 mm (1.9 in) |
| 1983 | 25.1 mm (1.0 in) |
| 1984 | 36.8 mm (1.4 in) |
| 1985 | 19.1 mm (0.8 in) |
| 1986 | 35.8 mm (1.4 in) |
| 1987 | 40.5 mm (1.6 in) |
| 1988 | 14.7 mm (0.6 in) |
| 1989 | 18.5 mm (0.7 in) |
| 1990 | 44.9 mm (1.8 in) |
| 1991 | 36.4 mm (1.4 in) |
| 1992 | 16.8 mm (0.7 in) |
| 1993 | 27.2 mm (1.1 in) |
| 1994 | 21.6 mm (0.9 in) |
| 1995 | 28.3 mm (1.1 in) |
| 1996 | 42.4 mm (1.7 in) |
| 1997 | 30.7 mm (1.2 in) |
| 1998 | 53.8 mm (2.1 in) |
| 1999 | 19.8 mm (0.8 in) |
| 2000 | 27.6 mm (1.1 in) |
| 2001 | 23.7 mm (0.9 in) |
| 2002 | 20.3 mm (0.8 in) |
| 2003 | 16.1 mm (0.6 in) |
| 2004 | 33.5 mm (1.3 in) |
| 2005 | 33.5 mm (1.3 in) |
| 2006 | 35.4 mm (1.4 in) |
| 2007 | 22.9 mm (0.9 in) |
| 2008 | 23.8 mm (0.9 in) |
| 2009 | 27.9 mm (1.1 in) |
| 2010 | 29.7 mm (1.2 in) |
| 2011 | 23.9 mm (0.9 in) |
| 2012 | 18.8 mm (0.7 in) |
| 2013 | 30.0 mm (1.2 in) |
| 2014 | 21.8 mm (0.9 in) |
| 2015 | 47.2 mm (1.9 in) |
| 2016 | 41.9 mm (1.6 in) |
| 2017 | 47.0 mm (1.9 in) |
| 2018 | 21.6 mm (0.9 in) |
| 2019 | 57.7 mm (2.3 in) |
| 2020 | 26.2 mm (1.0 in) |
| 2021 | 30.2 mm (1.2 in) |
| 2022 | 33.0 mm (1.3 in) |
| 2023 | 27.4 mm (1.1 in) |
| 2024 | 27.0 mm (1.1 in) |
| 2025 | 119.4 mm (4.7 in) |
| 2026 | 47.0 mm (1.9 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1935 | 95 days |
| 1936 | 62 days |
| 1937 | 39 days |
| 1938 | 52 days |
| 1939 | 63 days |
| 1940 | 63 days |
| 1941 | 30 days |
| 1942 | 61 days |
| 1943 | 57 days |
| 1944 | 96 days |
| 1945 | 26 days |
| 1946 | 28 days |
| 1947 | 81 days |
| 1948 | 37 days |
| 1949 | 100 days |
| 1950 | 29 days |
| 1951 | 50 days |
| 1952 | 68 days |
| 1953 | 49 days |
| 1954 | 54 days |
| 1955 | 52 days |
| 1956 | 48 days |
| 1957 | 70 days |
| 1958 | 55 days |
| 1959 | 51 days |
| 1960 | 64 days |
| 1961 | 39 days |
| 1962 | 35 days |
| 1963 | 32 days |
| 1964 | 43 days |
| 1965 | 46 days |
| 1966 | 81 days |
| 1967 | 81 days |
| 1968 | 53 days |
| 1969 | 73 days |
| 1970 | 37 days |
| 1971 | 46 days |
| 1972 | 36 days |
| 1973 | 34 days |
| 1974 | 89 days |
| 1975 | 42 days |
| 1976 | 38 days |
| 1977 | 40 days |
| 1978 | 74 days |
| 1979 | 39 days |
| 1980 | 60 days |
| 1981 | 81 days |
| 1982 | 30 days |
| 1983 | 24 days |
| 1984 | 33 days |
| 1985 | 39 days |
| 1986 | 33 days |
| 1987 | 78 days |
| 1988 | 76 days |
| 1989 | 64 days |
| 1990 | 63 days |
| 1991 | 53 days |
| 1992 | 46 days |
| 1993 | 46 days |
| 1994 | 58 days |
| 1995 | 26 days |
| 1996 | 34 days |
| 1997 | 41 days |
| 1998 | 38 days |
| 1999 | 76 days |
| 2000 | 52 days |
| 2001 | 36 days |
| 2002 | 53 days |
| 2003 | 70 days |
| 2004 | 47 days |
| 2005 | 68 days |
| 2006 | 47 days |
| 2007 | 59 days |
| 2008 | 81 days |
| 2009 | 35 days |
| 2010 | 44 days |
| 2011 | 32 days |
| 2012 | 68 days |
| 2013 | 56 days |
| 2014 | 39 days |
| 2015 | 53 days |
| 2016 | 64 days |
| 2017 | 47 days |
| 2018 | 70 days |
| 2019 | 58 days |
| 2020 | 57 days |
| 2021 | 40 days |
| 2022 | 71 days |
| 2023 | 40 days |
| 2024 | 48 days |
| 2025 | 29 days |
| 2026 | 46 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
80 years with a frostAcross 80 years with a frost, the median last spring frost at Owyhee Dam falls on 30 April and the median first autumn frost on 14 October, which leaves a median of 167 days between them.
In 1988 to 2023 the median growing season was 167 days. That is 4 days fewer than in 1937 to 1967.
Fitted over all years, the growing season changes by -1.3 days per decade at this station.
| Measure | Median, all years | Earliest period (1937 to 1967) | Recent period (1988 to 2023) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 30 April | 29 April | 2 May | 3 days later | +1.0 days per decade |
| First autumn frost | 14 October | 16 October | 14 October | 2 days earlier | -0.3 days per decade |
| Growing days | 167 days | 171 days | 167 days | 4 days fewer | -1.3 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
86 years, 1936 to 2023A day with at least 18.1 mm (0.7 in) of rain is expected about once in 2 years. A day with at least 58.7 mm (2.3 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 18.1 mm (0.7 in) | |
| 5 years | 25.6 mm (1.0 in) | |
| 10 years | 31.8 mm (1.3 in) | |
| 25 years | 41.0 mm (1.6 in) | |
| 50 years | 49.3 mm (1.9 in) | |
| 100 years | 58.7 mm (2.3 in) | Longer than the 86 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, 86 years of values from 1936 to 2023.
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: 62.5 mm (2.5 in) in 1949; 57.7 mm (2.3 in) in 2019; 47.0 mm (1.9 in) in 1979.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Climate Twins
2007 to 2023 against 1961 to 1990Over 2007 to 2023, Owyhee Dam had a mean temperature of 11.2 C (52.2 F) and 213.6 mm (8.4 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Bruneau (United States, 145 km away), Fruitland (United States, 1,077 km away) and Glenns Ferry (United States, 175 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Bruneau | United States | 145 km (90 mi) | 11.3 C (52.4 F) | 184.0 mm (7.2 in) | 0.64 |
| Fruitland | United States | 1,077 km (669 mi) | 11.2 C (52.2 F) | 211.2 mm (8.3 in) | 0.65 |
| Glenns Ferry | United States | 175 km (109 mi) | 11.0 C (51.7 F) | 262.4 mm (10.3 in) | 0.74 |
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 2026-10-12 (12 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-13).