Rocky Knob Threshold Days by Year (USC00447330)
13 fixed thresholds counted per year at Rocky Knob (USC00447330): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Rocky Knob Thresholds
- Rocky Knob: days with 10 mm (0.39 in) or more of precipitation in 26 years, most in 1949 with 55.
- Rocky Knob: days with 25 mm (0.98 in) or more of precipitation in 26 years, most in 1949 with 20.
- Rocky Knob: days with 50 mm (1.97 in) or more of precipitation in 23 years, most in 1959 with 7.
- Rocky Knob: days with a maximum temperature at or below 0 C (32 F) in 22 years, most in 1969 with 33.
- 13 fixed thresholds have at least one qualifying day at Rocky Knob.
Days at or above 30 C (86 F)
17 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1941 | 29 | 8.6 |
| 1942 | 4 | 8.6 |
| 1943 | 5 | 8.6 |
| 1944 | 8 | 8.6 |
| 1945 | 9 | 8.6 |
| 1947 | 3 | 8.6 |
| 1949 | 2 | 8.6 |
| 1951 | 1 | 5 |
| 1952 | 15 | 5 |
| 1953 | 6 | 5 |
| 1955 | 2 | 5 |
| 1956 | 1 | 5 |
| 1959 | 5 | 5 |
| 1965 | 1 | 4.3 |
| 1966 | 5 | 4.3 |
| 1968 | 3 | 4.3 |
| 1969 | 8 | 4.3 |
| Year | First date | Last date |
|---|---|---|
| 1941 | 1941-05-20 | 1941-10-07 |
| 1942 | 1942-07-17 | 1942-07-20 |
| 1943 | 1943-06-16 | 1943-09-02 |
| 1944 | 1944-06-16 | 1944-08-12 |
| 1945 | 1945-06-28 | 1945-09-01 |
| 1947 | 1947-06-11 | 1947-07-01 |
| 1949 | 1949-07-28 | 1949-07-29 |
| 1951 | 1951-10-06 | 1951-10-06 |
| 1952 | 1952-06-08 | 1952-07-30 |
| 1953 | 1953-07-29 | 1953-09-01 |
| 1955 | 1955-08-02 | 1955-08-06 |
| 1956 | 1956-07-02 | 1956-07-02 |
| 1959 | 1959-06-29 | 1959-08-24 |
| 1965 | 1965-08-17 | 1965-08-17 |
| 1966 | 1966-07-15 | 1966-07-29 |
| 1968 | 1968-07-01 | 1968-08-22 |
| 1969 | 1969-05-30 | 1969-08-01 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 17 | 29 | 1941 | 8 |
| 90 F (32.2 C): Days | 4 | 3 | 1941 | 2 |
| 0 C (32 F): Ice days (max | 22 | 33 | 1969 | 33 |
| 0 C (32 F): Frost days (min | 20 | 123 | 1969 | 90 |
| -10 C (14 F): Days with min | 20 | 37 | 1968 | 19 |
| 20 C (68 F): Tropical nights (min | 19 | 66 | 1941 | 1 |
| 25 C (77 F): Days with min | 3 | 4 | 1941 | 3 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 26 | 55 | 1949 | 32 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 26 | 20 | 1949 | 15 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 23 | 7 | 1959 | 2 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 8 | 1 | 1942 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 10 | 6 | 1960 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 1 | 3 | 1960 | 3 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1941.
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).