Ione 18 S Threshold Days by Year (USC00354161)
5 fixed thresholds counted per year at Ione 18 S (USC00354161): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Ione 18 S Thresholds
- Ione 18 S: days with 10 mm (0.39 in) or more of precipitation in 56 years, most in 1979 with 17.
- Ione 18 S: days with 10 cm (3.9 in) or more of snowfall in 30 years, most in 1948 with 5.
- Ione 18 S: days with 25 mm (0.98 in) or more of precipitation in 22 years, most in 1943 with 2.
- Ione 18 S: days with 25 cm (9.8 in) or more of snowfall in 2 years, most in 1950 with 1.
- 5 fixed thresholds have at least one qualifying day at Ione 18 S.
Days with 10 mm (0.39 in) or more of precipitation
56 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1936 | 6 | 7.3 |
| 1937 | 12 | 7.3 |
| 1938 | 8 | 7.3 |
| 1939 | 3 | 7.3 |
| 1940 | 12 | 9.5 |
| 1941 | 10 | 9.5 |
| 1942 | 16 | 9.5 |
| 1943 | 6 | 9.5 |
| 1944 | 6 | 9.5 |
| 1945 | 8 | 9.5 |
| 1946 | 6 | 9.5 |
| 1947 | 13 | 9.5 |
| 1948 | 13 | 9.5 |
| 1949 | 5 | 9.5 |
| 1950 | 13 | 8 |
| 1951 | 5 | 8 |
| 1952 | 10 | 8 |
| 1953 | 10 | 8 |
| 1954 | 2 | 8 |
| 1955 | 10 | 8 |
| 1956 | 6 | 8 |
| 1957 | 12 | 8 |
| 1958 | 9 | 8 |
| 1959 | 3 | 8 |
| 1960 | 6 | 7 |
| 1961 | 6 | 7 |
| 1962 | 10 | 7 |
| 1963 | 9 | 7 |
| 1964 | 8 | 7 |
| 1965 | 7 | 7 |
| 1966 | 9 | 7 |
| 1967 | 2 | 7 |
| 1968 | 6 | 7 |
| 1969 | 7 | 7 |
| 1970 | 6 | 6.9 |
| 1971 | 5 | 6.9 |
| 1972 | 4 | 6.9 |
| 1973 | 9 | 6.9 |
| 1974 | 2 | 6.9 |
| 1975 | 5 | 6.9 |
| 1976 | 6 | 6.9 |
| 1978 | 8 | 6.9 |
| 1979 | 17 | 6.9 |
| 1981 | 11 | 8.7 |
| 1984 | 11 | 8.7 |
| 1985 | 6 | 8.7 |
| 1986 | 9 | 8.7 |
| 1987 | 3 | 8.7 |
| 1988 | 12 | 8.7 |
| 1993 | 11 | 9 |
| 1994 | 7 | 9 |
| 1996 | 9 | 9 |
| 2000 | 4 | 6.8 |
| 2002 | 5 | 6.8 |
| 2003 | 10 | 6.8 |
| 2004 | 8 | 6.8 |
| Year | First date | Last date |
|---|---|---|
| 1936 | 1936-02-10 | 1936-09-01 |
| 1937 | 1937-01-05 | 1937-12-11 |
| 1938 | 1938-02-02 | 1938-07-28 |
| 1939 | 1939-03-12 | 1939-12-10 |
| 1940 | 1940-01-09 | 1940-11-24 |
| 1941 | 1941-01-14 | 1941-11-15 |
| 1942 | 1942-01-07 | 1942-12-31 |
| 1943 | 1943-04-08 | 1943-12-04 |
| 1944 | 1944-02-08 | 1944-11-03 |
| 1945 | 1945-02-08 | 1945-12-28 |
| 1946 | 1946-03-12 | 1946-12-26 |
| 1947 | 1947-06-03 | 1947-12-03 |
| 1948 | 1948-01-07 | 1948-12-14 |
| 1949 | 1949-02-18 | 1949-11-27 |
| 1950 | 1950-01-13 | 1950-12-14 |
| 1951 | 1951-04-27 | 1951-12-29 |
| 1952 | 1952-01-16 | 1952-12-20 |
| 1953 | 1953-01-09 | 1953-12-06 |
| 1954 | 1954-03-17 | 1954-06-06 |
| 1955 | 1955-03-25 | 1955-12-21 |
| 1956 | 1956-01-15 | 1956-06-10 |
| 1957 | 1957-02-22 | 1957-11-13 |
| 1958 | 1958-01-12 | 1958-12-11 |
| 1959 | 1959-01-27 | 1959-05-16 |
| 1960 | 1960-01-19 | 1960-11-25 |
| 1961 | 1961-02-10 | 1961-11-24 |
| 1962 | 1962-04-08 | 1962-12-02 |
| 1963 | 1963-01-31 | 1963-12-28 |
| 1964 | 1964-06-05 | 1964-12-24 |
| 1965 | 1965-01-29 | 1965-08-22 |
| 1966 | 1966-01-06 | 1966-12-25 |
| 1967 | 1967-04-24 | 1967-06-21 |
| 1968 | 1968-02-20 | 1968-12-04 |
| 1969 | 1969-01-08 | 1969-11-04 |
| 1970 | 1970-01-10 | 1970-11-11 |
| 1971 | 1971-01-16 | 1971-11-26 |
| 1972 | 1972-01-22 | 1972-10-11 |
| 1973 | 1973-02-10 | 1973-12-29 |
| 1974 | 1974-03-30 | 1974-04-23 |
| 1975 | 1975-01-04 | 1975-12-24 |
| 1976 | 1976-01-01 | 1976-08-25 |
| 1978 | 1978-01-11 | 1978-12-04 |
| 1979 | 1979-01-10 | 1979-12-04 |
| 1981 | 1981-01-30 | 1981-12-26 |
| 1984 | 1984-02-13 | 1984-11-26 |
| 1985 | 1985-02-03 | 1985-12-01 |
| 1986 | 1986-01-02 | 1986-12-31 |
| 1987 | 1987-01-20 | 1987-12-09 |
| 1988 | 1988-01-04 | 1988-11-19 |
| 1993 | 1993-01-14 | 1993-11-23 |
| 1994 | 1994-02-24 | 1994-10-31 |
| 1996 | 1996-01-07 | 1996-11-24 |
| 2000 | 2000-01-11 | 2000-11-01 |
| 2002 | 2002-02-07 | 2002-12-28 |
| 2003 | 2003-01-12 | 2003-12-31 |
| 2004 | 2004-01-06 | 2004-12-29 |
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 | 56 | 17 | 1979 | 8 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 22 | 2 | 1943 | 1 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 1 | 1 | 1996 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 30 | 5 | 1948 | 3 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 2 | 1 | 1950 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1936.
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).