Haiku 490 Threshold Days by Year
8 fixed thresholds counted per year at Haiku 490 (USC00510832): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Haiku 490 Thresholds
- Haiku 490: days with 10 mm (0.39 in) or more of precipitation in 37 years, most in 1914 with 79.
- Haiku 490: days with 25 mm (0.98 in) or more of precipitation in 37 years, most in 1910 with 29.
- Haiku 490: nights with a minimum temperature at or above 20 C (68 F) in 35 years, most in 1942 with 207.
- Haiku 490: days with 50 mm (1.97 in) or more of precipitation in 32 years, most in 1918 with 14.
- 8 fixed thresholds have at least one qualifying day at Haiku 490.
Days at or above 30 C (86 F)
31 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1905 | 2 | 2.3 |
| 1906 | 1 | 2.3 |
| 1907 | 3 | 2.3 |
| 1908 | 3 | 2.3 |
| 1910 | 4 | 3.3 |
| 1912 | 1 | 3.3 |
| 1917 | 5 | 3.3 |
| 1920 | 4 | 8.1 |
| 1921 | 7 | 8.1 |
| 1922 | 1 | 8.1 |
| 1923 | 16 | 8.1 |
| 1924 | 8 | 8.1 |
| 1925 | 8 | 8.1 |
| 1927 | 19 | 8.1 |
| 1928 | 5 | 8.1 |
| 1929 | 5 | 8.1 |
| 1930 | 2 | 23.4 |
| 1931 | 43 | 23.4 |
| 1932 | 23 | 23.4 |
| 1933 | 16 | 23.4 |
| 1934 | 12 | 23.4 |
| 1935 | 26 | 23.4 |
| 1936 | 50 | 23.4 |
| 1937 | 52 | 23.4 |
| 1938 | 8 | 23.4 |
| 1939 | 2 | 23.4 |
| 1941 | 3 | 5.6 |
| 1942 | 18 | 5.6 |
| 1943 | 1 | 5.6 |
| 1944 | 1 | 5.6 |
| 1945 | 5 | 5.6 |
| Year | First date | Last date |
|---|---|---|
| 1905 | 1905-01-09 | 1905-11-10 |
| 1906 | 1906-01-26 | 1906-01-26 |
| 1907 | 1907-09-15 | 1907-09-25 |
| 1908 | 1908-03-13 | 1908-10-10 |
| 1910 | 1910-05-28 | 1910-09-16 |
| 1912 | 1912-08-18 | 1912-08-18 |
| 1917 | 1917-09-11 | 1917-10-13 |
| 1920 | 1920-05-26 | 1920-08-19 |
| 1921 | 1921-05-27 | 1921-11-07 |
| 1922 | 1922-07-01 | 1922-07-01 |
| 1923 | 1923-05-11 | 1923-10-17 |
| 1924 | 1924-06-09 | 1924-11-06 |
| 1925 | 1925-07-17 | 1925-10-22 |
| 1927 | 1927-01-14 | 1927-09-21 |
| 1928 | 1928-01-02 | 1928-05-30 |
| 1929 | 1929-07-19 | 1929-11-04 |
| 1930 | 1930-02-20 | 1930-12-01 |
| 1931 | 1931-09-19 | 1931-11-14 |
| 1932 | 1932-01-08 | 1932-11-21 |
| 1933 | 1933-06-20 | 1933-12-29 |
| 1934 | 1934-01-01 | 1934-12-03 |
| 1935 | 1935-03-10 | 1935-12-30 |
| 1936 | 1936-01-04 | 1936-11-25 |
| 1937 | 1937-01-04 | 1937-12-09 |
| 1938 | 1938-01-04 | 1938-10-03 |
| 1939 | 1939-10-01 | 1939-10-02 |
| 1941 | 1941-10-23 | 1941-11-02 |
| 1942 | 1942-06-19 | 1942-12-06 |
| 1943 | 1943-09-24 | 1943-09-24 |
| 1944 | 1944-03-10 | 1944-03-10 |
| 1945 | 1945-07-20 | 1945-12-06 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 31 | 52 | 1937 | 5 |
| 90 F (32.2 C): Days | 7 | 26 | 1931 | 11 |
| 20 C (68 F): Tropical nights (min | 35 | 207 | 1942 | 140 |
| 25 C (77 F): Days with min | 3 | 3 | 1937 | 3 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 37 | 79 | 1914 | 41 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 37 | 29 | 1910 | 10 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 32 | 14 | 1918 | 2 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 16 | 3 | 1918 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1905.
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).