Grass Valley Threshold Days by Year (USC00043571)
18 fixed thresholds counted per year at Grass Valley (USC00043571): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Grass Valley Thresholds
- Grass Valley: nights with a minimum temperature at or below 0 C (32 F) in 58 years, most in 1906 with 110.
- Grass Valley: days with a maximum temperature at or above 30 C (86 F) in 57 years, most in 1936 with 122.
- Grass Valley: days with a maximum temperature at or above 90 F (32.2 C) in 57 years, most in 1924 with 89.
- Grass Valley: days with a maximum temperature at or above 35 C (95 F) in 55 years, most in 1939 with 48.
- 18 fixed thresholds have at least one qualifying day at Grass Valley.
Days at or above 30 C (86 F)
57 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1906 | 93 | 76 |
| 1909 | 59 | 76 |
| 1910 | 72 | 54.7 |
| 1911 | 53 | 54.7 |
| 1912 | 23 | 54.7 |
| 1913 | 45 | 54.7 |
| 1914 | 51 | 54.7 |
| 1915 | 43 | 54.7 |
| 1916 | 48 | 54.7 |
| 1917 | 85 | 54.7 |
| 1918 | 63 | 54.7 |
| 1919 | 64 | 54.7 |
| 1920 | 61 | 84.3 |
| 1921 | 64 | 84.3 |
| 1922 | 78 | 84.3 |
| 1923 | 69 | 84.3 |
| 1924 | 105 | 84.3 |
| 1925 | 82 | 84.3 |
| 1926 | 99 | 84.3 |
| 1927 | 87 | 84.3 |
| 1928 | 94 | 84.3 |
| 1929 | 104 | 84.3 |
| 1930 | 86 | 104.3 |
| 1931 | 100 | 104.3 |
| 1932 | 104 | 104.3 |
| 1933 | 107 | 104.3 |
| 1934 | 112 | 104.3 |
| 1935 | 109 | 104.3 |
| 1936 | 122 | 104.3 |
| 1937 | 113 | 104.3 |
| 1938 | 88 | 104.3 |
| 1939 | 102 | 104.3 |
| 1940 | 97 | 85.1 |
| 1941 | 62 | 85.1 |
| 1942 | 88 | 85.1 |
| 1943 | 91 | 85.1 |
| 1944 | 91 | 85.1 |
| 1945 | 95 | 85.1 |
| 1947 | 87 | 85.1 |
| 1948 | 79 | 85.1 |
| 1949 | 76 | 85.1 |
| 1950 | 89 | 82.8 |
| 1951 | 103 | 82.8 |
| 1952 | 100 | 82.8 |
| 1953 | 79 | 82.8 |
| 1954 | 75 | 82.8 |
| 1955 | 74 | 82.8 |
| 1956 | 70 | 82.8 |
| 1957 | 67 | 82.8 |
| 1958 | 87 | 82.8 |
| 1959 | 84 | 82.8 |
| 1960 | 84 | 75 |
| 1961 | 84 | 75 |
| 1962 | 77 | 75 |
| 1963 | 71 | 75 |
| 1964 | 65 | 75 |
| 1965 | 69 | 75 |
| Year | First date | Last date |
|---|---|---|
| 1906 | 1906-02-01 | 1906-10-31 |
| 1909 | 1909-05-31 | 1909-09-23 |
| 1910 | 1910-04-23 | 1910-10-08 |
| 1911 | 1911-06-10 | 1911-09-09 |
| 1912 | 1912-06-02 | 1912-09-19 |
| 1913 | 1913-05-25 | 1913-10-02 |
| 1914 | 1914-03-17 | 1914-10-14 |
| 1915 | 1915-06-07 | 1915-10-08 |
| 1916 | 1916-06-06 | 1916-09-29 |
| 1917 | 1917-06-08 | 1917-10-12 |
| 1918 | 1918-06-05 | 1918-10-19 |
| 1919 | 1919-05-27 | 1919-09-25 |
| 1920 | 1920-04-28 | 1920-09-29 |
| 1921 | 1921-06-06 | 1921-10-19 |
| 1922 | 1922-05-14 | 1922-09-24 |
| 1923 | 1923-05-08 | 1923-09-16 |
| 1924 | 1924-04-06 | 1924-10-03 |
| 1925 | 1925-03-22 | 1925-10-26 |
| 1926 | 1926-04-25 | 1926-10-05 |
| 1927 | 1927-04-24 | 1927-10-22 |
| 1928 | 1928-05-05 | 1928-10-19 |
| 1929 | 1929-05-21 | 1929-10-23 |
| 1930 | 1930-06-05 | 1930-10-06 |
| 1931 | 1931-04-20 | 1931-10-02 |
| 1932 | 1932-05-10 | 1932-11-17 |
| 1933 | 1933-05-27 | 1933-11-25 |
| 1934 | 1934-03-13 | 1934-10-27 |
| 1935 | 1935-05-04 | 1935-10-10 |
| 1936 | 1936-04-11 | 1936-11-18 |
| 1937 | 1937-05-12 | 1937-10-26 |
| 1938 | 1938-05-14 | 1938-10-25 |
| 1939 | 1939-04-18 | 1939-10-14 |
| 1940 | 1940-05-09 | 1940-10-19 |
| 1941 | 1941-05-10 | 1941-10-03 |
| 1942 | 1942-05-20 | 1942-10-21 |
| 1943 | 1943-05-21 | 1943-10-16 |
| 1944 | 1944-05-25 | 1944-10-26 |
| 1945 | 1945-04-30 | 1945-09-23 |
| 1947 | 1947-04-15 | 1947-10-05 |
| 1948 | 1948-06-08 | 1948-10-22 |
| 1949 | 1949-05-25 | 1949-10-30 |
| 1950 | 1950-05-20 | 1950-10-14 |
| 1951 | 1951-04-10 | 1951-10-09 |
| 1952 | 1952-05-17 | 1952-10-07 |
| 1953 | 1953-06-17 | 1953-10-10 |
| 1954 | 1954-05-17 | 1954-10-15 |
| 1955 | 1955-05-19 | 1955-10-16 |
| 1956 | 1956-05-16 | 1956-10-06 |
| 1957 | 1957-05-27 | 1957-09-25 |
| 1958 | 1958-05-17 | 1958-10-17 |
| 1959 | 1959-04-10 | 1959-10-26 |
| 1960 | 1960-05-31 | 1960-09-28 |
| 1961 | 1961-06-14 | 1961-10-18 |
| 1962 | 1962-06-02 | 1962-10-02 |
| 1963 | 1963-05-18 | 1963-10-04 |
| 1964 | 1964-06-23 | 1964-10-22 |
| 1965 | 1965-04-26 | 1965-10-26 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 57 | 122 | 1936 | 69 |
| 35 C (95 F): Days | 55 | 48 | 1939 | 18 |
| 40 C (104 F): Days | 20 | 10 | 1931 | 2 |
| 90 F (32.2 C): Days | 57 | 89 | 1924 | 43 |
| 100 F (37.8 C): Days | 43 | 27 | 1936 | 1 |
| 110 F (43.3 C): Days | 1 | 1 | 1933 | 1 |
| 0 C (32 F): Ice days (max | 5 | 3 | 1916 | 1 |
| 0 C (32 F): Frost days (min | 58 | 110 | 1906 | 54 |
| -10 C (14 F): Days with min | 7 | 4 | 1949 | 3 |
| 20 C (68 F): Tropical nights (min | 51 | 46 | 1931 | 1 |
| 25 C (77 F): Days with min | 11 | 9 | 1931 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 54 | 56 | 1906 | 35 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 54 | 34 | 1940 | 16 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 54 | 13 | 1906 | 9 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 26 | 4 | 1955 | 3 |
| 200 mm (7.87 in): Days with 200 mm or more rain | 1 | 1 | 1913 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 17 | 13 | 1952 | 4 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 6 | 5 | 1952 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1906.
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).