Little Sioux Threshold Days by Year (USC00134867)

20 fixed thresholds counted per year at Little Sioux (USC00134867): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Little Sioux Thresholds

Little Sioux: days with a maximum temperature at or above 30 C (86 F) in 43 years, most in 1936 with 102.
Little Sioux: days with a maximum temperature at or above 35 C (95 F) in 43 years, most in 1936 with 56.
Little Sioux: days with a maximum temperature at or above 90 F (32.2 C) in 43 years, most in 1934 with 79.
Little Sioux: days with a maximum temperature at or below 0 C (32 F) in 43 years, most in 1940 with 68.
20 fixed thresholds have at least one qualifying day at Little Sioux.

Days at or above 30 C (86 F)

43 years with a qualifying day

Days per year at Little Sioux with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 102 in 1936.

Days at or above 30 C (86 F) per year at Little Sioux
Year	Days	Decade average
1905	51	53
1906	44	53
1907	52	53
1908	57	53
1909	61	53
1910	75	65
1911	82	65
1912	59	65
1913	68	65
1914	73	65
1915	28	65
1916	68	65
1917	47	65
1918	82	65
1919	68	65
1920	58	59.2
1921	84	59.2
1922	68	59.2
1923	46	59.2
1924	34	59.2
1925	79	59.2
1926	72	59.2
1927	59	59.2
1928	48	59.2
1929	44	59.2
1930	64	79.7
1931	94	79.7
1932	43	79.7
1933	81	79.7
1934	97	79.7
1935	66	79.7
1936	102	79.7
1937	85	79.7
1938	75	79.7
1939	90	79.7
1940	64	61.8
1941	68	61.8
1942	61	61.8
1943	71	61.8
1944	61	61.8
1945	46	61.8
1946	51	61.8
1947	72	61.8

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

First to last qualifying date each year at Little Sioux
Year	First date	Last date
1905	1905-06-01	1905-10-07
1906	1906-04-24	1906-09-15
1907	1907-03-21	1907-09-23
1908	1908-04-13	1908-09-24
1909	1909-05-04	1909-10-02
1910	1910-03-19	1910-10-16
1911	1911-05-09	1911-09-27
1912	1912-05-02	1912-10-05
1913	1913-04-30	1913-10-09
1914	1914-04-16	1914-09-19
1915	1915-04-28	1915-09-07
1916	1916-04-12	1916-10-07
1917	1917-05-17	1917-09-17
1918	1918-05-03	1918-10-12
1919	1919-05-28	1919-10-01
1920	1920-05-22	1920-10-03
1921	1921-04-03	1921-10-16
1922	1922-05-05	1922-10-27
1923	1923-06-01	1923-08-26
1924	1924-04-14	1924-08-30
1925	1925-04-21	1925-09-29
1926	1926-04-29	1926-09-21
1927	1927-04-26	1927-10-26
1928	1928-03-23	1928-10-11
1929	1929-04-04	1929-09-03
1930	1930-04-10	1930-10-10
1931	1931-04-08	1931-10-10
1932	1932-05-13	1932-10-02
1933	1933-05-16	1933-09-25
1934	1934-04-29	1934-10-12
1935	1935-06-12	1935-09-24
1936	1936-04-13	1936-10-18
1937	1937-05-20	1937-10-29
1938	1938-06-05	1938-10-16
1939	1939-04-23	1939-10-06
1940	1940-04-14	1940-10-25
1941	1941-05-14	1941-09-21
1942	1942-04-29	1942-09-16
1943	1943-03-30	1943-09-05
1944	1944-05-14	1944-09-17
1945	1945-05-20	1945-10-18
1946	1946-04-19	1946-09-26
1947	1947-05-14	1947-10-21

Every Fixed Threshold

Fixed thresholds at Little Sioux
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	43	102	1936	72
35 C (95 F): Days	43	56	1936	35
40 C (104 F): Days	12	24	1936	1
45 C (113 F): Days	1	2	1936	2
90 F (32.2 C): Days	43	79	1934	55
100 F (37.8 C): Days	27	35	1936	8
110 F (43.3 C): Days	1	5	1936	5
0 C (32 F): Ice days (max	43	68	1940	41
0 C (32 F): Frost days (min	43	170	1917	148
-10 C (14 F): Days with min	43	75	1917	40
-20 C (-4 F): Days with min	43	34	1936	8
-30 C (-22 F): Days with min	18	9	1936	1
20 C (68 F): Tropical nights (min	43	58	1936	41
25 C (77 F): Days with min	13	17	1936	2
10 mm (0.39 in): Days with 10 mm or more rain	42	34	1915	25
25 mm (0.98 in): Days with 25 mm or more rain	42	14	1945	9
50 mm (1.97 in): Days with 50 mm or more rain	27	4	1915	1
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1915	1
10 cm (3.9 in): Days with 10 cm or more snowfall	27	6	1932	4
25 cm (9.8 in): Days with 25 cm or more snowfall	1	2	1915	2

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

Data for Little Sioux 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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

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

Little Sioux Threshold Days by Year (USC00134867)

Key Facts for Little Sioux Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related