Rio Vista Threshold Days by Year (USC00047446)
11 fixed thresholds counted per year at Rio Vista (USC00047446): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Rio Vista Thresholds
- Rio Vista: days with 10 mm (0.39 in) or more of precipitation in 64 years, most in 1906 with 32.
- Rio Vista: days with 25 mm (0.98 in) or more of precipitation in 60 years, most in 1940 with 13.
- Rio Vista: days with 50 mm (1.97 in) or more of precipitation in 15 years, most in 1931 with 2.
- Rio Vista: days with a maximum temperature at or above 30 C (86 F) in 12 years, most in 1894 with 82.
- 11 fixed thresholds have at least one qualifying day at Rio Vista.
Days at or above 30 C (86 F)
12 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1894 | 82 | 78.8 |
| 1895 | 79 | 78.8 |
| 1896 | 77 | 78.8 |
| 1897 | 76 | 78.8 |
| 1898 | 82 | 78.8 |
| 1899 | 77 | 78.8 |
| 1900 | 56 | 64 |
| 1902 | 67 | 64 |
| 1903 | 72 | 64 |
| 1904 | 64 | 64 |
| 1905 | 50 | 64 |
| 1906 | 75 | 64 |
| Year | First date | Last date |
|---|---|---|
| 1894 | 1894-04-09 | 1894-10-05 |
| 1895 | 1895-04-21 | 1895-10-11 |
| 1896 | 1896-05-25 | 1896-10-07 |
| 1897 | 1897-04-25 | 1897-09-25 |
| 1898 | 1898-04-11 | 1898-10-21 |
| 1899 | 1899-05-08 | 1899-10-09 |
| 1900 | 1900-05-19 | 1900-09-29 |
| 1902 | 1902-05-25 | 1902-09-27 |
| 1903 | 1903-05-02 | 1903-10-20 |
| 1904 | 1904-05-09 | 1904-10-04 |
| 1905 | 1905-05-15 | 1905-10-04 |
| 1906 | 1906-06-17 | 1906-10-08 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 12 | 82 | 1894 | 75 |
| 35 C (95 F): Days | 12 | 29 | 1897 | 24 |
| 40 C (104 F): Days | 11 | 5 | 1898 | 1 |
| 90 F (32.2 C): Days | 12 | 62 | 1894 | 45 |
| 100 F (37.8 C): Days | 12 | 13 | 1897 | 6 |
| 0 C (32 F): Frost days (min | 12 | 37 | 1895 | 16 |
| 20 C (68 F): Tropical nights (min | 11 | 18 | 1902 | 5 |
| 25 C (77 F): Days with min | 2 | 1 | 1896 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 64 | 32 | 1906 | 3 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 60 | 13 | 1940 | 1 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 15 | 2 | 1931 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1894.
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).