Rock Creek Threshold Days by Year
17 fixed thresholds counted per year at Rock Creek (CA001136812): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Rock Creek Thresholds
- Rock Creek: days with 10 mm (0.39 in) or more of precipitation in 34 years, most in 1941 with 20.
- Rock Creek: days with a maximum temperature at or above 30 C (86 F) in 27 years, most in 1934 with 76.
- Rock Creek: days with a maximum temperature at or above 35 C (95 F) in 27 years, most in 1933 with 23.
- Rock Creek: days with a maximum temperature at or above 90 F (32.2 C) in 27 years, most in 1934 with 54.
- 17 fixed thresholds have at least one qualifying day at Rock Creek.
Days at or above 30 C (86 F)
27 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1921 | 36 | 44.9 |
| 1922 | 55 | 44.9 |
| 1923 | 36 | 44.9 |
| 1924 | 52 | 44.9 |
| 1925 | 52 | 44.9 |
| 1926 | 56 | 44.9 |
| 1927 | 33 | 44.9 |
| 1928 | 40 | 44.9 |
| 1929 | 44 | 44.9 |
| 1930 | 43 | 52.1 |
| 1931 | 52 | 52.1 |
| 1932 | 54 | 52.1 |
| 1933 | 46 | 52.1 |
| 1934 | 76 | 52.1 |
| 1935 | 46 | 52.1 |
| 1936 | 48 | 52.1 |
| 1937 | 45 | 52.1 |
| 1938 | 61 | 52.1 |
| 1939 | 50 | 52.1 |
| 1940 | 54 | 37.1 |
| 1941 | 24 | 37.1 |
| 1942 | 42 | 37.1 |
| 1943 | 41 | 37.1 |
| 1944 | 34 | 37.1 |
| 1945 | 48 | 37.1 |
| 1946 | 28 | 37.1 |
| 1947 | 26 | 37.1 |
| Year | First date | Last date |
|---|---|---|
| 1921 | 1921-05-31 | 1921-08-30 |
| 1922 | 1922-05-31 | 1922-09-12 |
| 1923 | 1923-06-28 | 1923-09-13 |
| 1924 | 1924-05-10 | 1924-09-16 |
| 1925 | 1925-06-19 | 1925-09-23 |
| 1926 | 1926-04-28 | 1926-08-25 |
| 1927 | 1927-06-06 | 1927-08-23 |
| 1928 | 1928-05-20 | 1928-09-27 |
| 1929 | 1929-05-20 | 1929-09-15 |
| 1930 | 1930-05-14 | 1930-09-08 |
| 1931 | 1931-05-10 | 1931-09-03 |
| 1932 | 1932-06-09 | 1932-09-30 |
| 1933 | 1933-06-03 | 1933-09-04 |
| 1934 | 1934-04-21 | 1934-09-06 |
| 1935 | 1935-06-04 | 1935-10-03 |
| 1936 | 1936-04-17 | 1936-09-20 |
| 1937 | 1937-05-03 | 1937-09-19 |
| 1938 | 1938-05-22 | 1938-09-23 |
| 1939 | 1939-04-28 | 1939-09-23 |
| 1940 | 1940-05-22 | 1940-09-12 |
| 1941 | 1941-05-23 | 1941-08-22 |
| 1942 | 1942-06-29 | 1942-09-27 |
| 1943 | 1943-06-28 | 1943-10-07 |
| 1944 | 1944-06-10 | 1944-09-12 |
| 1945 | 1945-05-30 | 1945-09-14 |
| 1946 | 1946-07-19 | 1946-09-02 |
| 1947 | 1947-05-07 | 1947-09-01 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 27 | 76 | 1934 | 26 |
| 35 C (95 F): Days | 27 | 23 | 1933 | 1 |
| 40 C (104 F): Days | 6 | 3 | 1933 | 1 |
| 90 F (32.2 C): Days | 27 | 54 | 1934 | 11 |
| 100 F (37.8 C): Days | 19 | 9 | 1933 | 1 |
| 110 F (43.3 C): Days | 1 | 1 | 1934 | 1 |
| 0 C (32 F): Ice days (max | 27 | 74 | 1922 | 57 |
| 0 C (32 F): Frost days (min | 27 | 233 | 1935 | 162 |
| -10 C (14 F): Days with min | 27 | 87 | 1936 | 33 |
| -20 C (-4 F): Days with min | 26 | 37 | 1922 | 9 |
| -30 C (-22 F): Days with min | 14 | 14 | 1930 | 4 |
| -40 C (-40 F): Days with min | 4 | 2 | 1924 | 1 |
| 20 C (68 F): Tropical nights (min | 1 | 1 | 1941 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 34 | 20 | 1941 | 13 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 15 | 3 | 1916 | 1 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 1 | 1 | 1916 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 23 | 6 | 1937 | 3 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1921.
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 2026-10-13 (13 October 2026). Threshold counts are computed by this site.
Data as of . Last revised (2026-10-13).