Merriman Dam Threshold Days by Year (USC00305276)
6 fixed thresholds counted per year at Merriman Dam (USC00305276): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Merriman Dam Thresholds
- Merriman Dam: days with 10 mm (0.39 in) or more of precipitation in 36 years, most in 1990 with 52.
- Merriman Dam: days with 25 mm (0.98 in) or more of precipitation in 36 years, most in 1974 with 18.
- Merriman Dam: days with 50 mm (1.97 in) or more of precipitation in 29 years, most in 1996 with 6.
- Merriman Dam: days with 10 cm (3.9 in) or more of snowfall in 15 years, most in 1978 with 8.
- 6 fixed thresholds have at least one qualifying day at Merriman Dam.
Days with 10 mm (0.39 in) or more of precipitation
36 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1962 | 32 | 34 |
| 1963 | 37 | 34 |
| 1964 | 25 | 34 |
| 1965 | 32 | 34 |
| 1966 | 32 | 34 |
| 1967 | 40 | 34 |
| 1968 | 37 | 34 |
| 1969 | 37 | 34 |
| 1970 | 33 | 42.6 |
| 1971 | 40 | 42.6 |
| 1972 | 47 | 42.6 |
| 1973 | 51 | 42.6 |
| 1974 | 46 | 42.6 |
| 1975 | 47 | 42.6 |
| 1976 | 45 | 42.6 |
| 1977 | 41 | 42.6 |
| 1978 | 41 | 42.6 |
| 1979 | 35 | 42.6 |
| 1980 | 25 | 35.3 |
| 1981 | 33 | 35.3 |
| 1982 | 39 | 35.3 |
| 1984 | 36 | 35.3 |
| 1985 | 39 | 35.3 |
| 1986 | 49 | 35.3 |
| 1987 | 36 | 35.3 |
| 1988 | 31 | 35.3 |
| 1989 | 30 | 35.3 |
| 1990 | 52 | 40 |
| 1991 | 31 | 40 |
| 1992 | 41 | 40 |
| 1993 | 39 | 40 |
| 1994 | 40 | 40 |
| 1995 | 30 | 40 |
| 1996 | 47 | 40 |
| 2001 | 28 | 31 |
| 2002 | 34 | 31 |
| Year | First date | Last date |
|---|---|---|
| 1962 | 1962-01-06 | 1962-12-30 |
| 1963 | 1963-01-12 | 1963-12-13 |
| 1964 | 1964-01-02 | 1964-12-28 |
| 1965 | 1965-01-03 | 1965-12-26 |
| 1966 | 1966-01-03 | 1966-12-29 |
| 1967 | 1967-01-28 | 1967-12-29 |
| 1968 | 1968-01-15 | 1968-12-28 |
| 1969 | 1969-01-24 | 1969-12-26 |
| 1970 | 1970-02-03 | 1970-12-24 |
| 1971 | 1971-01-01 | 1971-12-31 |
| 1972 | 1972-01-03 | 1972-12-31 |
| 1973 | 1973-01-01 | 1973-12-28 |
| 1974 | 1974-01-11 | 1974-12-25 |
| 1975 | 1975-01-07 | 1975-12-31 |
| 1976 | 1976-01-12 | 1976-12-08 |
| 1977 | 1977-01-10 | 1977-12-21 |
| 1978 | 1978-01-09 | 1978-12-25 |
| 1979 | 1979-01-01 | 1979-12-25 |
| 1980 | 1980-02-16 | 1980-11-25 |
| 1981 | 1981-01-07 | 1981-12-23 |
| 1982 | 1982-01-04 | 1982-12-17 |
| 1984 | 1984-02-15 | 1984-12-22 |
| 1985 | 1985-02-13 | 1985-12-25 |
| 1986 | 1986-01-20 | 1986-12-25 |
| 1987 | 1987-01-03 | 1987-12-16 |
| 1988 | 1988-01-26 | 1988-12-29 |
| 1989 | 1989-01-13 | 1989-11-01 |
| 1990 | 1990-01-01 | 1990-12-31 |
| 1991 | 1991-01-12 | 1991-12-30 |
| 1992 | 1992-01-15 | 1992-12-31 |
| 1993 | 1993-01-05 | 1993-12-22 |
| 1994 | 1994-01-05 | 1994-12-24 |
| 1995 | 1995-01-01 | 1995-12-20 |
| 1996 | 1996-01-03 | 1996-12-25 |
| 2001 | 2001-02-06 | 2001-12-18 |
| 2002 | 2002-01-20 | 2002-12-26 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 10 mm (0.39 in): Days with 10 mm or more rain | 36 | 52 | 1990 | 34 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 36 | 18 | 1974 | 13 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 29 | 6 | 1996 | 2 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 3 | 1 | 1971 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 15 | 8 | 1978 | 3 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 5 | 3 | 1978 | 2 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1962.
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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.
Data as of . Last revised (2025-12-31).