Sion Threshold Days by Year (CA003015960)
17 fixed thresholds counted per year at Sion (CA003015960): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Sion Thresholds
- Sion: days with 10 mm (0.39 in) or more of precipitation in 62 years, most in 1943 with 27.
- Sion: nights with a minimum temperature at or below 0 C (32 F) in 61 years, most in 1925 with 254.
- Sion: nights with a minimum temperature at or below -10 C (14 F) in 61 years, most in 1924 with 137.
- Sion: nights with a minimum temperature at or below -20 C (-4 F) in 61 years, most in 1935 with 94.
- 17 fixed thresholds have at least one qualifying day at Sion.
Days at or above 30 C (86 F)
47 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1911 | 3 | 5.4 |
| 1912 | 18 | 5.4 |
| 1913 | 1 | 5.4 |
| 1914 | 6 | 5.4 |
| 1915 | 1 | 5.4 |
| 1917 | 8 | 5.4 |
| 1918 | 1 | 5.4 |
| 1924 | 6 | 6.3 |
| 1925 | 6 | 6.3 |
| 1926 | 5 | 6.3 |
| 1928 | 8 | 6.3 |
| 1932 | 2 | 6.3 |
| 1933 | 4 | 6.3 |
| 1935 | 3 | 6.3 |
| 1936 | 9 | 6.3 |
| 1937 | 4 | 6.3 |
| 1938 | 5 | 6.3 |
| 1939 | 17 | 6.3 |
| 1940 | 17 | 11.2 |
| 1941 | 17 | 11.2 |
| 1942 | 25 | 11.2 |
| 1943 | 2 | 11.2 |
| 1944 | 2 | 11.2 |
| 1946 | 4 | 11.2 |
| 1952 | 1 | 3.3 |
| 1954 | 1 | 3.3 |
| 1955 | 6 | 3.3 |
| 1956 | 4 | 3.3 |
| 1958 | 5 | 3.3 |
| 1959 | 3 | 3.3 |
| 1960 | 4 | 5.8 |
| 1961 | 11 | 5.8 |
| 1963 | 8 | 5.8 |
| 1964 | 3 | 5.8 |
| 1965 | 3 | 5.8 |
| 1967 | 13 | 5.8 |
| 1968 | 2 | 5.8 |
| 1969 | 2 | 5.8 |
| 1970 | 5 | 2 |
| 1971 | 3 | 2 |
| 1972 | 1 | 2 |
| 1973 | 1 | 2 |
| 1975 | 1 | 2 |
| 1979 | 1 | 2 |
| 1981 | 9 | 4.3 |
| 1982 | 3 | 4.3 |
| 1983 | 1 | 4.3 |
| Year | First date | Last date |
|---|---|---|
| 1911 | 1911-06-11 | 1911-10-09 |
| 1912 | 1912-05-13 | 1912-06-27 |
| 1913 | 1913-07-24 | 1913-07-24 |
| 1914 | 1914-06-01 | 1914-07-03 |
| 1915 | 1915-08-15 | 1915-08-15 |
| 1917 | 1917-07-11 | 1917-07-28 |
| 1918 | 1918-07-18 | 1918-07-18 |
| 1924 | 1924-06-30 | 1924-07-05 |
| 1925 | 1925-07-12 | 1925-08-06 |
| 1926 | 1926-06-26 | 1926-07-25 |
| 1928 | 1928-05-21 | 1928-08-08 |
| 1932 | 1932-07-22 | 1932-08-08 |
| 1933 | 1933-07-25 | 1933-08-18 |
| 1935 | 1935-07-14 | 1935-07-23 |
| 1936 | 1936-05-26 | 1936-07-22 |
| 1937 | 1937-06-16 | 1937-07-18 |
| 1938 | 1938-06-18 | 1938-07-28 |
| 1939 | 1939-05-14 | 1939-08-27 |
| 1940 | 1940-05-23 | 1940-09-04 |
| 1941 | 1941-06-10 | 1941-07-21 |
| 1942 | 1942-06-05 | 1942-09-07 |
| 1943 | 1943-09-24 | 1943-09-25 |
| 1944 | 1944-05-29 | 1944-07-19 |
| 1946 | 1946-07-27 | 1946-08-01 |
| 1952 | 1952-09-25 | 1952-09-25 |
| 1954 | 1954-07-07 | 1954-07-07 |
| 1955 | 1955-07-13 | 1955-08-31 |
| 1956 | 1956-05-31 | 1956-07-21 |
| 1958 | 1958-07-18 | 1958-08-25 |
| 1959 | 1959-05-16 | 1959-07-23 |
| 1960 | 1960-07-07 | 1960-07-31 |
| 1961 | 1961-06-02 | 1961-08-15 |
| 1963 | 1963-07-03 | 1963-08-09 |
| 1964 | 1964-07-08 | 1964-07-12 |
| 1965 | 1965-06-11 | 1965-08-01 |
| 1967 | 1967-08-10 | 1967-09-16 |
| 1968 | 1968-07-04 | 1968-07-05 |
| 1969 | 1969-06-17 | 1969-06-18 |
| 1970 | 1970-06-02 | 1970-07-15 |
| 1971 | 1971-08-01 | 1971-08-20 |
| 1972 | 1972-05-30 | 1972-05-30 |
| 1973 | 1973-06-22 | 1973-06-22 |
| 1975 | 1975-07-12 | 1975-07-12 |
| 1979 | 1979-07-19 | 1979-07-19 |
| 1981 | 1981-07-03 | 1981-09-18 |
| 1982 | 1982-06-13 | 1982-06-21 |
| 1983 | 1983-08-10 | 1983-08-10 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 47 | 25 | 1942 | 1 |
| 35 C (95 F): Days | 5 | 2 | 1924 | 1 |
| 90 F (32.2 C): Days | 23 | 8 | 1939 | 2 |
| 100 F (37.8 C): Days | 1 | 1 | 1924 | 1 |
| 0 C (32 F): Ice days (max | 57 | 122 | 1982 | 110 |
| 0 C (32 F): Frost days (min | 61 | 254 | 1925 | 192 |
| -10 C (14 F): Days with min | 61 | 137 | 1924 | 86 |
| -20 C (-4 F): Days with min | 61 | 94 | 1935 | 31 |
| -30 C (-22 F): Days with min | 61 | 46 | 1936 | 7 |
| -40 C (-40 F): Days with min | 30 | 18 | 1936 | 1 |
| 20 C (68 F): Tropical nights (min | 1 | 1 | 1983 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 62 | 27 | 1943 | 12 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 53 | 10 | 1942 | 2 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 10 | 2 | 1969 | 2 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 60 | 12 | 1924 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 9 | 2 | 1924 | 1 |
| 50 cm (19.7 in): Days with 50 cm or more snowfall | 1 | 1 | 1924 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1911.
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 (2026-10-17).