Copley Threshold Days by Year
4 fixed thresholds counted per year at Copley (ASN00017018): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Copley Thresholds
- Copley: days with 10 mm (0.39 in) or more of precipitation in 71 years, most in 1955 with 16.
- Copley: days with 25 mm (0.98 in) or more of precipitation in 50 years, most in 1887 with 4.
- Copley: days with 50 mm (1.97 in) or more of precipitation in 13 years, most in 1891 with 2.
- Copley: days with 100 mm (3.94 in) or more of precipitation in 1 years, most in 1950 with 1.
- 4 fixed thresholds have at least one qualifying day at Copley.
Days with 10 mm (0.39 in) or more of precipitation
71 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1884 | 2 | 6.2 |
| 1885 | 7 | 6.2 |
| 1886 | 8 | 6.2 |
| 1887 | 8 | 6.2 |
| 1888 | 1 | 6.2 |
| 1889 | 11 | 6.2 |
| 1890 | 7 | 7.1 |
| 1891 | 9 | 7.1 |
| 1892 | 8 | 7.1 |
| 1893 | 6 | 7.1 |
| 1894 | 8 | 7.1 |
| 1895 | 10 | 7.1 |
| 1897 | 4 | 7.1 |
| 1898 | 3 | 7.1 |
| 1899 | 9 | 7.1 |
| 1900 | 4 | 6 |
| 1907 | 7 | 6 |
| 1908 | 6 | 6 |
| 1909 | 7 | 6 |
| 1910 | 12 | 5.3 |
| 1911 | 4 | 5.3 |
| 1912 | 4 | 5.3 |
| 1914 | 3 | 5.3 |
| 1915 | 3 | 5.3 |
| 1916 | 7 | 5.3 |
| 1917 | 6 | 5.3 |
| 1918 | 3 | 5.3 |
| 1919 | 6 | 5.3 |
| 1920 | 7 | 4 |
| 1921 | 7 | 4 |
| 1922 | 2 | 4 |
| 1923 | 3 | 4 |
| 1924 | 6 | 4 |
| 1925 | 3 | 4 |
| 1926 | 6 | 4 |
| 1927 | 2 | 4 |
| 1928 | 3 | 4 |
| 1929 | 1 | 4 |
| 1930 | 3 | 4.2 |
| 1931 | 5 | 4.2 |
| 1932 | 5 | 4.2 |
| 1933 | 2 | 4.2 |
| 1934 | 5 | 4.2 |
| 1935 | 2 | 4.2 |
| 1936 | 2 | 4.2 |
| 1937 | 6 | 4.2 |
| 1938 | 5 | 4.2 |
| 1939 | 7 | 4.2 |
| 1940 | 2 | 3.5 |
| 1941 | 5 | 3.5 |
| 1942 | 5 | 3.5 |
| 1943 | 2 | 3.5 |
| 1944 | 2 | 3.5 |
| 1945 | 6 | 3.5 |
| 1946 | 2 | 3.5 |
| 1947 | 4 | 3.5 |
| 1948 | 2 | 3.5 |
| 1949 | 5 | 3.5 |
| 1950 | 6 | 6 |
| 1951 | 1 | 6 |
| 1952 | 3 | 6 |
| 1953 | 5 | 6 |
| 1954 | 10 | 6 |
| 1955 | 16 | 6 |
| 1956 | 5 | 6 |
| 1957 | 3 | 6 |
| 1958 | 10 | 6 |
| 1959 | 1 | 6 |
| 1960 | 3 | 2.7 |
| 1961 | 2 | 2.7 |
| 1962 | 3 | 2.7 |
| Year | First date | Last date |
|---|---|---|
| 1884 | 1884-03-29 | 1884-06-18 |
| 1885 | 1885-01-22 | 1885-12-09 |
| 1886 | 1886-01-22 | 1886-12-07 |
| 1887 | 1887-02-09 | 1887-12-25 |
| 1888 | 1888-12-31 | 1888-12-31 |
| 1889 | 1889-01-01 | 1889-11-15 |
| 1890 | 1890-01-09 | 1890-07-21 |
| 1891 | 1891-01-06 | 1891-12-10 |
| 1892 | 1892-05-28 | 1892-11-08 |
| 1893 | 1893-04-12 | 1893-11-11 |
| 1894 | 1894-04-12 | 1894-12-26 |
| 1895 | 1895-01-04 | 1895-12-10 |
| 1897 | 1897-06-17 | 1897-09-21 |
| 1898 | 1898-02-24 | 1898-06-14 |
| 1899 | 1899-01-18 | 1899-11-04 |
| 1900 | 1900-01-19 | 1900-08-30 |
| 1907 | 1907-01-26 | 1907-08-02 |
| 1908 | 1908-06-11 | 1908-12-11 |
| 1909 | 1909-04-21 | 1909-10-31 |
| 1910 | 1910-01-08 | 1910-11-05 |
| 1911 | 1911-02-02 | 1911-12-01 |
| 1912 | 1912-03-09 | 1912-12-06 |
| 1914 | 1914-03-13 | 1914-12-23 |
| 1915 | 1915-05-13 | 1915-09-23 |
| 1916 | 1916-07-07 | 1916-11-24 |
| 1917 | 1917-01-31 | 1917-11-21 |
| 1918 | 1918-03-05 | 1918-05-12 |
| 1919 | 1919-02-17 | 1919-12-28 |
| 1920 | 1920-01-16 | 1920-11-12 |
| 1921 | 1921-03-01 | 1921-12-24 |
| 1922 | 1922-09-26 | 1922-12-05 |
| 1923 | 1923-06-30 | 1923-12-16 |
| 1924 | 1924-04-01 | 1924-12-15 |
| 1925 | 1925-02-06 | 1925-07-10 |
| 1926 | 1926-03-20 | 1926-09-24 |
| 1927 | 1927-06-09 | 1927-06-18 |
| 1928 | 1928-06-02 | 1928-07-16 |
| 1929 | 1929-12-27 | 1929-12-27 |
| 1930 | 1930-04-24 | 1930-12-05 |
| 1931 | 1931-03-13 | 1931-06-24 |
| 1932 | 1932-02-06 | 1932-10-12 |
| 1933 | 1933-05-25 | 1933-08-31 |
| 1934 | 1934-02-10 | 1934-11-07 |
| 1935 | 1935-06-30 | 1935-09-11 |
| 1936 | 1936-05-30 | 1936-07-25 |
| 1937 | 1937-01-09 | 1937-11-30 |
| 1938 | 1938-02-19 | 1938-08-23 |
| 1939 | 1939-01-24 | 1939-06-29 |
| 1940 | 1940-04-01 | 1940-05-11 |
| 1941 | 1941-01-03 | 1941-11-07 |
| 1942 | 1942-02-13 | 1942-06-13 |
| 1943 | 1943-02-17 | 1943-08-18 |
| 1944 | 1944-02-07 | 1944-12-21 |
| 1945 | 1945-06-20 | 1945-10-26 |
| 1946 | 1946-01-17 | 1946-09-19 |
| 1947 | 1947-03-29 | 1947-12-03 |
| 1948 | 1948-10-09 | 1948-12-25 |
| 1949 | 1949-02-26 | 1949-09-08 |
| 1950 | 1950-02-02 | 1950-11-07 |
| 1951 | 1951-10-09 | 1951-10-09 |
| 1952 | 1952-01-24 | 1952-10-29 |
| 1953 | 1953-01-31 | 1953-11-04 |
| 1954 | 1954-01-19 | 1954-12-04 |
| 1955 | 1955-01-27 | 1955-09-23 |
| 1956 | 1956-02-07 | 1956-07-31 |
| 1957 | 1957-06-20 | 1957-12-30 |
| 1958 | 1958-01-21 | 1958-11-29 |
| 1959 | 1959-07-30 | 1959-07-30 |
| 1960 | 1960-04-26 | 1960-07-02 |
| 1961 | 1961-04-20 | 1961-11-17 |
| 1962 | 1962-01-17 | 1962-12-27 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 10 mm (0.39 in): Days with 10 mm or more rain | 71 | 16 | 1955 | 3 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 50 | 4 | 1887 | 1 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 13 | 2 | 1891 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 1 | 1 | 1950 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1884.
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).