St Helena Island Threshold Days by Year
5 fixed thresholds counted per year at St Helena Island (ASN00040337): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for St Helena Island Thresholds
- St Helena Island: days with 10 mm (0.39 in) or more of precipitation in 51 years, most in 1893 with 51.
- St Helena Island: days with 25 mm (0.98 in) or more of precipitation in 51 years, most in 1927 with 22.
- St Helena Island: days with 50 mm (1.97 in) or more of precipitation in 48 years, most in 1893 with 13.
- St Helena Island: days with 100 mm (3.94 in) or more of precipitation in 27 years, most in 1893 with 7.
- 5 fixed thresholds have at least one qualifying day at St Helena Island.
Days with 10 mm (0.39 in) or more of precipitation
51 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1888 | 28 | 34.5 |
| 1889 | 41 | 34.5 |
| 1890 | 33 | 35.3 |
| 1891 | 36 | 35.3 |
| 1892 | 36 | 35.3 |
| 1893 | 51 | 35.3 |
| 1894 | 30 | 35.3 |
| 1895 | 37 | 35.3 |
| 1896 | 31 | 35.3 |
| 1897 | 31 | 35.3 |
| 1898 | 41 | 35.3 |
| 1899 | 27 | 35.3 |
| 1900 | 29 | 29.5 |
| 1901 | 32 | 29.5 |
| 1902 | 11 | 29.5 |
| 1903 | 50 | 29.5 |
| 1904 | 23 | 29.5 |
| 1905 | 27 | 29.5 |
| 1906 | 33 | 29.5 |
| 1907 | 32 | 29.5 |
| 1908 | 33 | 29.5 |
| 1909 | 25 | 29.5 |
| 1910 | 36 | 31.3 |
| 1911 | 28 | 31.3 |
| 1912 | 39 | 31.3 |
| 1913 | 34 | 31.3 |
| 1914 | 32 | 31.3 |
| 1915 | 24 | 31.3 |
| 1916 | 39 | 31.3 |
| 1917 | 35 | 31.3 |
| 1918 | 29 | 31.3 |
| 1919 | 17 | 31.3 |
| 1920 | 35 | 34.2 |
| 1921 | 38 | 34.2 |
| 1922 | 25 | 34.2 |
| 1923 | 24 | 34.2 |
| 1924 | 34 | 34.2 |
| 1925 | 42 | 34.2 |
| 1926 | 23 | 34.2 |
| 1927 | 49 | 34.2 |
| 1928 | 38 | 34.2 |
| 1929 | 34 | 34.2 |
| 1930 | 31 | 31.6 |
| 1931 | 35 | 31.6 |
| 1932 | 19 | 31.6 |
| 1933 | 35 | 31.6 |
| 1934 | 42 | 31.6 |
| 1935 | 38 | 31.6 |
| 1936 | 22 | 31.6 |
| 1937 | 33 | 31.6 |
| 1938 | 29 | 31.6 |
| Year | First date | Last date |
|---|---|---|
| 1888 | 1888-01-24 | 1888-12-02 |
| 1889 | 1889-01-22 | 1889-12-18 |
| 1890 | 1890-01-13 | 1890-11-25 |
| 1891 | 1891-01-15 | 1891-12-17 |
| 1892 | 1892-01-12 | 1892-12-30 |
| 1893 | 1893-01-10 | 1893-11-30 |
| 1894 | 1894-01-07 | 1894-12-31 |
| 1895 | 1895-01-01 | 1895-12-30 |
| 1896 | 1896-01-08 | 1896-12-20 |
| 1897 | 1897-01-04 | 1897-12-31 |
| 1898 | 1898-01-04 | 1898-12-24 |
| 1899 | 1899-01-11 | 1899-12-31 |
| 1900 | 1900-01-07 | 1900-11-17 |
| 1901 | 1901-01-14 | 1901-11-17 |
| 1902 | 1902-01-27 | 1902-11-29 |
| 1903 | 1903-01-12 | 1903-12-16 |
| 1904 | 1904-01-24 | 1904-12-20 |
| 1905 | 1905-01-16 | 1905-12-31 |
| 1906 | 1906-01-01 | 1906-12-23 |
| 1907 | 1907-01-11 | 1907-12-19 |
| 1908 | 1908-01-04 | 1908-12-11 |
| 1909 | 1909-01-17 | 1909-12-28 |
| 1910 | 1910-01-13 | 1910-12-19 |
| 1911 | 1911-01-03 | 1911-12-02 |
| 1912 | 1912-01-06 | 1912-12-24 |
| 1913 | 1913-01-05 | 1913-12-19 |
| 1914 | 1914-01-13 | 1914-12-29 |
| 1915 | 1915-01-02 | 1915-12-16 |
| 1916 | 1916-01-21 | 1916-12-25 |
| 1917 | 1917-01-14 | 1917-12-21 |
| 1918 | 1918-01-03 | 1918-12-18 |
| 1919 | 1919-02-21 | 1919-12-31 |
| 1920 | 1920-01-01 | 1920-12-09 |
| 1921 | 1921-01-07 | 1921-12-31 |
| 1922 | 1922-01-01 | 1922-12-26 |
| 1923 | 1923-01-03 | 1923-12-26 |
| 1924 | 1924-01-07 | 1924-12-31 |
| 1925 | 1925-01-02 | 1925-12-31 |
| 1926 | 1926-01-03 | 1926-12-30 |
| 1927 | 1927-01-05 | 1927-12-26 |
| 1928 | 1928-01-07 | 1928-12-24 |
| 1929 | 1929-01-12 | 1929-12-30 |
| 1930 | 1930-01-24 | 1930-12-18 |
| 1931 | 1931-01-29 | 1931-12-23 |
| 1932 | 1932-02-04 | 1932-12-22 |
| 1933 | 1933-01-06 | 1933-12-30 |
| 1934 | 1934-01-04 | 1934-12-29 |
| 1935 | 1935-01-06 | 1935-12-20 |
| 1936 | 1936-01-05 | 1936-12-24 |
| 1937 | 1937-01-04 | 1937-12-16 |
| 1938 | 1938-01-18 | 1938-11-30 |
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 | 51 | 51 | 1893 | 29 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 51 | 22 | 1927 | 14 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 48 | 13 | 1893 | 4 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 27 | 7 | 1893 | 2 |
| 200 mm (7.87 in): Days with 200 mm or more rain | 5 | 2 | 1893 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1888.
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 2026-10-15 (15 October 2026). Threshold counts are computed by this site.
Data as of . Last revised (2025-12-31).