Riva Threshold Days by Year (ITE00155370)
12 fixed thresholds counted per year at Riva (ITE00155370): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Riva Thresholds
- Riva: nights with a minimum temperature at or below 0 C (32 F) in 54 years, most in 1963 with 75.
- Riva: nights with a minimum temperature at or above 20 C (68 F) in 54 years, most in 1904 with 64.
- Riva: days with a maximum temperature at or above 30 C (86 F) in 44 years, most in 1950 with 39.
- Riva: days with 10 mm (0.39 in) or more of precipitation in 41 years, most in 1901 with 53.
- 12 fixed thresholds have at least one qualifying day at Riva.
Days at or above 30 C (86 F)
44 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1877 | 6 | 9.5 |
| 1879 | 13 | 9.5 |
| 1880 | 11 | 11.9 |
| 1881 | 26 | 11.9 |
| 1882 | 12 | 11.9 |
| 1883 | 7 | 11.9 |
| 1884 | 10 | 11.9 |
| 1885 | 16 | 11.9 |
| 1886 | 13 | 11.9 |
| 1887 | 16 | 11.9 |
| 1888 | 7 | 11.9 |
| 1889 | 1 | 11.9 |
| 1891 | 2 | 4.4 |
| 1892 | 8 | 4.4 |
| 1893 | 5 | 4.4 |
| 1894 | 5 | 4.4 |
| 1895 | 9 | 4.4 |
| 1896 | 2 | 4.4 |
| 1897 | 5 | 4.4 |
| 1898 | 2 | 4.4 |
| 1899 | 2 | 4.4 |
| 1900 | 7 | 3.3 |
| 1901 | 2 | 3.3 |
| 1902 | 3 | 3.3 |
| 1904 | 6 | 3.3 |
| 1905 | 2 | 3.3 |
| 1906 | 3 | 3.3 |
| 1907 | 1 | 3.3 |
| 1909 | 2 | 3.3 |
| 1911 | 9 | 9 |
| 1950 | 39 | 9.3 |
| 1954 | 1 | 9.3 |
| 1955 | 6 | 9.3 |
| 1956 | 2 | 9.3 |
| 1957 | 8 | 9.3 |
| 1958 | 7 | 9.3 |
| 1959 | 2 | 9.3 |
| 1961 | 2 | 10 |
| 1962 | 7 | 10 |
| 1963 | 20 | 10 |
| 1964 | 12 | 10 |
| 1966 | 6 | 10 |
| 1967 | 13 | 10 |
| 1968 | 10 | 10 |
| Year | First date | Last date |
|---|---|---|
| 1877 | 1877-08-21 | 1877-08-31 |
| 1879 | 1879-06-28 | 1879-09-01 |
| 1880 | 1880-07-15 | 1880-07-30 |
| 1881 | 1881-06-24 | 1881-08-24 |
| 1882 | 1882-05-30 | 1882-08-13 |
| 1883 | 1883-07-05 | 1883-07-14 |
| 1884 | 1884-07-12 | 1884-08-06 |
| 1885 | 1885-06-27 | 1885-08-12 |
| 1886 | 1886-07-06 | 1886-09-02 |
| 1887 | 1887-06-25 | 1887-08-10 |
| 1888 | 1888-06-05 | 1888-08-16 |
| 1889 | 1889-07-13 | 1889-07-13 |
| 1891 | 1891-07-01 | 1891-07-02 |
| 1892 | 1892-07-10 | 1892-08-21 |
| 1893 | 1893-08-20 | 1893-08-25 |
| 1894 | 1894-07-03 | 1894-07-27 |
| 1895 | 1895-07-04 | 1895-09-09 |
| 1896 | 1896-07-11 | 1896-07-13 |
| 1897 | 1897-07-01 | 1897-07-10 |
| 1898 | 1898-08-21 | 1898-08-22 |
| 1899 | 1899-07-23 | 1899-07-26 |
| 1900 | 1900-07-18 | 1900-07-29 |
| 1901 | 1901-08-03 | 1901-08-12 |
| 1902 | 1902-07-09 | 1902-08-09 |
| 1904 | 1904-07-10 | 1904-08-16 |
| 1905 | 1905-07-03 | 1905-07-04 |
| 1906 | 1906-08-02 | 1906-08-04 |
| 1907 | 1907-08-05 | 1907-08-05 |
| 1909 | 1909-07-27 | 1909-07-29 |
| 1911 | 1911-07-21 | 1911-09-07 |
| 1950 | 1950-07-01 | 1950-08-31 |
| 1954 | 1954-06-22 | 1954-06-22 |
| 1955 | 1955-07-17 | 1955-07-23 |
| 1956 | 1956-07-08 | 1956-07-09 |
| 1957 | 1957-07-03 | 1957-07-10 |
| 1958 | 1958-07-15 | 1958-08-03 |
| 1959 | 1959-07-14 | 1959-07-21 |
| 1961 | 1961-06-20 | 1961-07-03 |
| 1962 | 1962-06-24 | 1962-08-16 |
| 1963 | 1963-06-23 | 1963-08-04 |
| 1964 | 1964-06-08 | 1964-08-02 |
| 1966 | 1966-06-13 | 1966-08-15 |
| 1967 | 1967-07-01 | 1967-07-25 |
| 1968 | 1968-06-29 | 1968-07-11 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 44 | 39 | 1950 | 10 |
| 35 C (95 F): Days | 1 | 1 | 1957 | 1 |
| 90 F (32.2 C): Days | 10 | 6 | 1881 | 1 |
| 0 C (32 F): Ice days (max | 27 | 17 | 1963 | 5 |
| 0 C (32 F): Frost days (min | 54 | 75 | 1963 | 60 |
| -10 C (14 F): Days with min | 2 | 1 | 1956 | 1 |
| 20 C (68 F): Tropical nights (min | 54 | 64 | 1904 | 9 |
| 25 C (77 F): Days with min | 4 | 4 | 1957 | 4 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 41 | 53 | 1901 | 36 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 41 | 20 | 1888 | 13 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 34 | 5 | 1888 | 2 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 3 | 2 | 1882 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1877.
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).