Harmattan Threshold Days by Year (CA003023055)
14 fixed thresholds counted per year at Harmattan (CA003023055): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Harmattan Thresholds
- Harmattan: days with a maximum temperature at or below 0 C (32 F) in 29 years, most in 1937 with 98.
- Harmattan: nights with a minimum temperature at or below 0 C (32 F) in 29 years, most in 1921 with 265.
- Harmattan: nights with a minimum temperature at or below -10 C (14 F) in 29 years, most in 1922 with 138.
- Harmattan: nights with a minimum temperature at or below -20 C (-4 F) in 29 years, most in 1936 with 74.
- 14 fixed thresholds have at least one qualifying day at Harmattan.
Days at or above 30 C (86 F)
20 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1910 | 2 | 3.5 |
| 1912 | 1 | 3.5 |
| 1914 | 6 | 3.5 |
| 1918 | 5 | 3.5 |
| 1920 | 2 | 3.8 |
| 1921 | 2 | 3.8 |
| 1922 | 3 | 3.8 |
| 1924 | 2 | 3.8 |
| 1925 | 4 | 3.8 |
| 1926 | 6 | 3.8 |
| 1928 | 2 | 3.8 |
| 1929 | 9 | 3.8 |
| 1930 | 2 | 5.9 |
| 1931 | 1 | 5.9 |
| 1933 | 8 | 5.9 |
| 1934 | 10 | 5.9 |
| 1935 | 3 | 5.9 |
| 1936 | 15 | 5.9 |
| 1937 | 3 | 5.9 |
| 1938 | 5 | 5.9 |
| Year | First date | Last date |
|---|---|---|
| 1910 | 1910-07-14 | 1910-07-17 |
| 1912 | 1912-06-27 | 1912-06-27 |
| 1914 | 1914-07-04 | 1914-08-04 |
| 1918 | 1918-07-17 | 1918-08-01 |
| 1920 | 1920-07-17 | 1920-08-13 |
| 1921 | 1921-07-20 | 1921-08-02 |
| 1922 | 1922-06-03 | 1922-08-02 |
| 1924 | 1924-07-01 | 1924-07-02 |
| 1925 | 1925-07-11 | 1925-08-02 |
| 1926 | 1926-06-26 | 1926-07-13 |
| 1928 | 1928-05-25 | 1928-05-26 |
| 1929 | 1929-07-02 | 1929-08-31 |
| 1930 | 1930-07-12 | 1930-07-13 |
| 1931 | 1931-07-22 | 1931-07-22 |
| 1933 | 1933-06-13 | 1933-08-18 |
| 1934 | 1934-05-28 | 1934-08-28 |
| 1935 | 1935-07-14 | 1935-08-12 |
| 1936 | 1936-05-27 | 1936-08-06 |
| 1937 | 1937-06-28 | 1937-07-25 |
| 1938 | 1938-07-22 | 1938-09-21 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 20 | 15 | 1936 | 5 |
| 35 C (95 F): Days | 1 | 1 | 1937 | 1 |
| 90 F (32.2 C): Days | 12 | 5 | 1933 | 1 |
| 0 C (32 F): Ice days (max | 29 | 98 | 1937 | 61 |
| 0 C (32 F): Frost days (min | 29 | 265 | 1921 | 220 |
| -10 C (14 F): Days with min | 29 | 138 | 1922 | 98 |
| -20 C (-4 F): Days with min | 29 | 74 | 1936 | 38 |
| -30 C (-22 F): Days with min | 29 | 34 | 1936 | 12 |
| -40 C (-40 F): Days with min | 20 | 9 | 1936 | 2 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 29 | 22 | 1915 | 12 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 23 | 10 | 1916 | 4 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 11 | 2 | 1916 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 23 | 7 | 1924 | 3 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 2 | 1 | 1932 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1910.
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 (2026-10-17).