Ottumwa 1 WSW Threshold Days by Year (USC00136386)
20 fixed thresholds counted per year at Ottumwa 1 WSW (USC00136386): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Ottumwa 1 WSW Thresholds
- Ottumwa 1 WSW: days with a maximum temperature at or above 30 C (86 F) in 41 years, most in 1936 with 108.
- Ottumwa 1 WSW: days with a maximum temperature at or above 90 F (32.2 C) in 41 years, most in 1934 with 91.
- Ottumwa 1 WSW: days with a maximum temperature at or below 0 C (32 F) in 41 years, most in 1937 with 57.
- Ottumwa 1 WSW: days with a maximum temperature at or above 35 C (95 F) in 40 years, most in 1934 with 60.
- 20 fixed thresholds have at least one qualifying day at Ottumwa 1 WSW.
Days at or above 30 C (86 F)
41 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1896 | 53 | 59 |
| 1897 | 71 | 59 |
| 1898 | 53 | 59 |
| 1899 | 59 | 59 |
| 1900 | 63 | 61.6 |
| 1901 | 78 | 61.6 |
| 1902 | 28 | 61.6 |
| 1906 | 74 | 61.6 |
| 1908 | 65 | 61.6 |
| 1910 | 83 | 58 |
| 1911 | 85 | 58 |
| 1915 | 20 | 58 |
| 1916 | 62 | 58 |
| 1917 | 38 | 58 |
| 1919 | 60 | 58 |
| 1923 | 61 | 62.1 |
| 1924 | 41 | 62.1 |
| 1925 | 90 | 62.1 |
| 1926 | 74 | 62.1 |
| 1927 | 62 | 62.1 |
| 1928 | 56 | 62.1 |
| 1929 | 51 | 62.1 |
| 1930 | 78 | 85.2 |
| 1931 | 82 | 85.2 |
| 1932 | 54 | 85.2 |
| 1933 | 85 | 85.2 |
| 1934 | 105 | 85.2 |
| 1935 | 72 | 85.2 |
| 1936 | 108 | 85.2 |
| 1937 | 82 | 85.2 |
| 1938 | 93 | 85.2 |
| 1939 | 93 | 85.2 |
| 1940 | 74 | 70.6 |
| 1941 | 79 | 70.6 |
| 1942 | 82 | 70.6 |
| 1943 | 80 | 70.6 |
| 1944 | 79 | 70.6 |
| 1945 | 45 | 70.6 |
| 1946 | 52 | 70.6 |
| 1947 | 70 | 70.6 |
| 1948 | 74 | 70.6 |
| Year | First date | Last date |
|---|---|---|
| 1896 | 1896-04-15 | 1896-08-24 |
| 1897 | 1897-06-12 | 1897-10-15 |
| 1898 | 1898-05-24 | 1898-10-01 |
| 1899 | 1899-05-16 | 1899-10-23 |
| 1900 | 1900-05-12 | 1900-10-04 |
| 1901 | 1901-04-29 | 1901-09-24 |
| 1902 | 1902-04-21 | 1902-08-03 |
| 1906 | 1906-04-24 | 1906-09-23 |
| 1908 | 1908-04-13 | 1908-10-16 |
| 1910 | 1910-03-23 | 1910-10-18 |
| 1911 | 1911-05-09 | 1911-09-16 |
| 1915 | 1915-04-22 | 1915-09-13 |
| 1916 | 1916-05-25 | 1916-10-08 |
| 1917 | 1917-05-19 | 1917-09-17 |
| 1919 | 1919-05-30 | 1919-09-20 |
| 1923 | 1923-05-31 | 1923-09-04 |
| 1924 | 1924-05-05 | 1924-09-26 |
| 1925 | 1925-04-22 | 1925-09-29 |
| 1926 | 1926-04-21 | 1926-09-21 |
| 1927 | 1927-03-16 | 1927-10-27 |
| 1928 | 1928-05-03 | 1928-10-10 |
| 1929 | 1929-05-28 | 1929-09-27 |
| 1930 | 1930-04-10 | 1930-10-10 |
| 1931 | 1931-04-08 | 1931-10-10 |
| 1932 | 1932-05-14 | 1932-09-19 |
| 1933 | 1933-05-19 | 1933-09-25 |
| 1934 | 1934-05-06 | 1934-09-25 |
| 1935 | 1935-06-10 | 1935-10-16 |
| 1936 | 1936-04-20 | 1936-09-22 |
| 1937 | 1937-05-29 | 1937-10-29 |
| 1938 | 1938-03-21 | 1938-10-17 |
| 1939 | 1939-04-24 | 1939-10-25 |
| 1940 | 1940-04-02 | 1940-10-26 |
| 1941 | 1941-05-04 | 1941-09-23 |
| 1942 | 1942-04-29 | 1942-10-08 |
| 1943 | 1943-05-05 | 1943-10-10 |
| 1944 | 1944-05-15 | 1944-09-18 |
| 1945 | 1945-06-23 | 1945-09-23 |
| 1946 | 1946-06-07 | 1946-10-05 |
| 1947 | 1947-06-09 | 1947-10-21 |
| 1948 | 1948-04-18 | 1948-09-20 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 41 | 108 | 1936 | 74 |
| 35 C (95 F): Days | 40 | 60 | 1934 | 14 |
| 40 C (104 F): Days | 11 | 30 | 1936 | 3 |
| 45 C (113 F): Days | 2 | 2 | 1934 | 2 |
| 90 F (32.2 C): Days | 41 | 91 | 1934 | 43 |
| 100 F (37.8 C): Days | 24 | 47 | 1936 | 3 |
| 110 F (43.3 C): Days | 3 | 8 | 1934 | 4 |
| 0 C (32 F): Ice days (max | 41 | 57 | 1937 | 49 |
| 0 C (32 F): Frost days (min | 38 | 154 | 1943 | 127 |
| -10 C (14 F): Days with min | 38 | 59 | 1937 | 46 |
| -20 C (-4 F): Days with min | 35 | 29 | 1936 | 10 |
| -30 C (-22 F): Days with min | 6 | 3 | 1936 | 1 |
| 20 C (68 F): Tropical nights (min | 38 | 63 | 1900 | 22 |
| 25 C (77 F): Days with min | 18 | 17 | 1900 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 38 | 40 | 1898 | 25 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 38 | 16 | 1902 | 7 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 33 | 4 | 1902 | 2 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 2 | 1 | 1902 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 22 | 4 | 1931 | 2 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 2 | 1 | 1924 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1896.
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).