Hiawatha Threshold Days by Year

14 fixed thresholds counted per year at Hiawatha (USC00423896): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Hiawatha Thresholds

Hiawatha: days with 10 mm (0.39 in) or more of precipitation in 67 years, most in 1941 with 16.
Hiawatha: days with 10 cm (3.9 in) or more of snowfall in 57 years, most in 1969 with 16.
Hiawatha: days with a maximum temperature at or below 0 C (32 F) in 56 years, most in 1922 with 77.
Hiawatha: nights with a minimum temperature at or below 0 C (32 F) in 56 years, most in 1984 with 209.
14 fixed thresholds have at least one qualifying day at Hiawatha.

Days at or above 30 C (86 F)

54 years with a qualifying day

Days per year at Hiawatha with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 38 in 1940.

Days at or above 30 C (86 F) per year at Hiawatha
Year	Days	Decade average
1922	12	8
1923	6	8
1924	14	8
1926	4	8
1927	4	8
1928	9	8
1929	7	8
1930	10	14.7
1931	21	14.7
1932	8	14.7
1933	20	14.7
1934	26	14.7
1935	8	14.7
1936	15	14.7
1937	8	14.7
1938	9	14.7
1939	22	14.7
1940	38	14.1
1941	9	14.1
1942	13	14.1
1943	12	14.1
1944	8	14.1
1945	4	14.1
1946	21	14.1
1947	6	14.1
1948	20	14.1
1949	10	14.1
1950	12	13.2
1951	7	13.2
1952	5	13.2
1953	12	13.2
1954	16	13.2
1955	10	13.2
1956	13	13.2
1957	9	13.2
1958	30	13.2
1959	18	13.2
1960	35	16.7
1961	19	16.7
1962	12	16.7
1963	13	16.7
1967	9	16.7
1968	10	16.7
1969	19	16.7
1970	22	11.7
1975	8	11.7
1976	5	11.7
1980	13	8.8
1981	19	8.8
1982	4	8.8
1984	6	8.8
1985	8	8.8
1986	3	8.8
1991	1	1

For each year, a bar from the first to the last day at Hiawatha meeting 30 C (86 F).

First to last qualifying date each year at Hiawatha
Year	First date	Last date
1922	1922-06-19	1922-07-25
1923	1923-06-30	1923-07-30
1924	1924-06-25	1924-08-29
1926	1926-06-26	1926-07-16
1927	1927-06-23	1927-07-18
1928	1928-06-25	1928-08-21
1929	1929-06-25	1929-08-13
1930	1930-06-16	1930-07-08
1931	1931-07-09	1931-08-25
1932	1932-06-22	1932-08-24
1933	1933-07-12	1933-09-05
1934	1934-06-30	1934-09-01
1935	1935-07-12	1935-07-30
1936	1936-05-30	1936-07-26
1937	1937-06-21	1937-08-13
1938	1938-07-10	1938-08-05
1939	1939-06-13	1939-08-18
1940	1940-06-12	1940-08-19
1941	1941-07-04	1941-08-06
1942	1942-07-06	1942-08-09
1943	1943-07-06	1943-08-02
1944	1944-07-13	1944-08-24
1945	1945-07-25	1945-07-28
1946	1946-07-01	1946-08-13
1947	1947-07-12	1947-07-31
1948	1948-07-09	1948-09-03
1949	1949-07-16	1949-08-06
1950	1950-06-30	1950-09-06
1951	1951-07-14	1951-08-17
1952	1952-07-21	1952-08-05
1953	1953-06-12	1953-07-26
1954	1954-06-21	1954-08-30
1955	1955-06-24	1955-09-01
1956	1956-06-12	1956-08-09
1957	1957-06-28	1957-08-02
1958	1958-06-25	1958-09-01
1959	1959-06-17	1959-08-08
1960	1960-06-30	1960-08-21
1961	1961-06-19	1961-08-09
1962	1962-06-25	1962-08-16
1963	1963-07-15	1963-07-31
1967	1967-07-10	1967-08-07
1968	1968-06-21	1968-07-20
1969	1969-07-02	1969-08-27
1970	1970-06-23	1970-08-13
1975	1975-07-01	1975-08-09
1976	1976-07-11	1976-07-28
1980	1980-07-05	1980-08-09
1981	1981-06-22	1981-08-06
1982	1982-07-13	1982-07-21
1984	1984-07-04	1984-07-17
1985	1985-07-03	1985-07-11
1986	1986-08-01	1986-08-18
1991	1991-07-05	1991-07-05

Every Fixed Threshold

Fixed thresholds at Hiawatha
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	54	38	1940	1
35 C (95 F): Days	1	2	1931	2
90 F (32.2 C): Days	24	16	1940	1
0 C (32 F): Ice days (max	56	77	1922	45
0 C (32 F): Frost days (min	56	209	1984	178
-10 C (14 F): Days with min	56	69	1948	60
-20 C (-4 F): Days with min	27	6	1933	4
20 C (68 F): Tropical nights (min	9	3	1931	1
10 mm (0.39 in): Days with 10 mm or more rain	67	16	1941	11
25 mm (0.98 in): Days with 25 mm or more rain	47	5	1922	1
50 mm (1.97 in): Days with 50 mm or more rain	3	1	1922	1
10 cm (3.9 in): Days with 10 cm or more snowfall	57	16	1969	3
25 cm (9.8 in): Days with 25 cm or more snowfall	28	4	1951	1
50 cm (19.7 in): Days with 50 cm or more snowfall	2	1	1923	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1922.

Download the Data

Data for Hiawatha threshold days by year: CSV or JSON. Field meanings are on the data page.

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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Hiawatha Threshold Days by Year

Key Facts for Hiawatha Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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