Postville Threshold Days by Year (USC00136766)

18 fixed thresholds counted per year at Postville (USC00136766): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Postville Thresholds

Postville: days with a maximum temperature at or below 0 C (32 F) in 68 years, most in 1940 with 89.
Postville: days with a maximum temperature at or above 30 C (86 F) in 67 years, most in 1988 with 57.
Postville: days with 10 mm (0.39 in) or more of precipitation in 61 years, most in 2018 with 47.
Postville: days with 25 mm (0.98 in) or more of precipitation in 61 years, most in 2018 with 19.
18 fixed thresholds have at least one qualifying day at Postville.

Days at or above 30 C (86 F)

67 years with a qualifying day

Days per year at Postville with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 57 in 1988.

Days at or above 30 C (86 F) per year at Postville
Year	Days	Decade average
1902	12	13
1903	4	13
1905	17	13
1906	18	13
1907	11	13
1909	16	13
1910	29	18.9
1911	25	18.9
1912	14	18.9
1913	29	18.9
1914	14	18.9
1916	26	18.9
1917	9	18.9
1918	13	18.9
1919	11	18.9
1920	12	14
1921	23	14
1922	9	14
1923	19	14
1924	2	14
1925	19	14
1926	10	14
1927	21	14
1928	11	14
1929	14	14
1930	23	33.2
1931	40	33.2
1932	18	33.2
1933	40	33.2
1934	47	33.2
1935	24	33.2
1936	54	33.2
1937	39	33.2
1938	19	33.2
1939	28	33.2
1940	24	22
1941	29	22
1942	13	22
1943	17	22
1945	27	22
1988	57	40.5
1989	24	40.5
1990	15	15
2002	31	24.6
2003	35	24.6
2004	7	24.6
2005	38	24.6
2006	25	24.6
2007	36	24.6
2008	14	24.6
2009	11	24.6
2010	21	28.7
2011	37	28.7
2012	55	28.7
2013	26	28.7
2014	12	28.7
2016	20	28.7
2017	23	28.7
2018	39	28.7
2019	25	28.7
2020	30	34.3
2021	43	34.3
2022	30	34.3
2023	43	34.3
2024	28	34.3
2025	41	34.3
2026	25	34.3

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

First to last qualifying date each year at Postville
Year	First date	Last date
1902	1902-04-21	1902-08-26
1903	1903-06-08	1903-08-04
1905	1905-06-04	1905-08-21
1906	1906-06-06	1906-09-11
1907	1907-06-16	1907-08-31
1909	1909-05-05	1909-08-26
1910	1910-06-17	1910-08-24
1911	1911-05-10	1911-08-16
1912	1912-06-28	1912-09-09
1913	1913-06-15	1913-09-07
1914	1914-06-21	1914-08-18
1916	1916-07-01	1916-09-06
1917	1917-05-18	1917-08-20
1918	1918-05-04	1918-08-13
1919	1919-06-01	1919-09-20
1920	1920-06-10	1920-08-11
1921	1921-05-22	1921-08-29
1922	1922-06-23	1922-09-08
1923	1923-06-20	1923-08-14
1924	1924-08-03	1924-08-21
1925	1925-04-22	1925-09-19
1926	1926-05-29	1926-08-27
1927	1927-06-28	1927-09-17
1928	1928-05-09	1928-10-10
1929	1929-07-22	1929-09-03
1930	1930-04-10	1930-09-12
1931	1931-06-18	1931-09-16
1932	1932-05-14	1932-08-30
1933	1933-06-05	1933-09-08
1934	1934-05-06	1934-08-18
1935	1935-07-03	1935-09-24
1936	1936-05-06	1936-09-22
1937	1937-05-30	1937-09-23
1938	1938-06-22	1938-09-10
1939	1939-04-24	1939-09-28
1940	1940-05-12	1940-09-20
1941	1941-06-20	1941-09-21
1942	1942-05-29	1942-09-01
1943	1943-05-29	1943-08-24
1945	1945-06-22	1945-09-07
1988	1988-05-28	1988-09-17
1989	1989-06-19	1989-08-22
1990	1990-06-12	1990-09-06
2002	2002-04-15	2002-09-10
2003	2003-04-15	2003-08-31
2004	2004-04-29	2004-09-12
2005	2005-05-07	2005-10-05
2006	2006-05-25	2006-09-09
2007	2007-04-30	2007-10-07
2008	2008-06-08	2008-09-03
2009	2009-05-20	2009-08-09
2010	2010-05-24	2010-08-30
2011	2011-05-11	2011-09-02
2012	2012-05-16	2012-09-12
2013	2013-05-15	2013-09-20
2014	2014-05-31	2014-09-05
2016	2016-05-07	2016-09-07
2017	2017-06-03	2017-09-26
2018	2018-05-25	2018-09-21
2019	2019-05-17	2019-10-01
2020	2020-06-03	2020-08-28
2021	2021-05-02	2021-09-20
2022	2022-05-11	2022-09-21
2023	2023-04-13	2023-10-03
2024	2024-05-19	2024-09-22
2025	2025-05-16	2025-10-05
2026	2026-05-16	2026-08-13

Every Fixed Threshold

Fixed thresholds at Postville
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	67	57	1988	25
35 C (95 F): Days	26	19	1934	1
40 C (104 F): Days	2	2	1934	2
90 F (32.2 C): Days	60	36	1988	12
100 F (37.8 C): Days	7	9	1936	1
0 C (32 F): Ice days (max	68	89	1940	33
0 C (32 F): Frost days (min	60	189	2002	97
-10 C (14 F): Days with min	60	83	2013	36
-20 C (-4 F): Days with min	60	41	1929	11
-30 C (-22 F): Days with min	29	6	1936	2
20 C (68 F): Tropical nights (min	60	24	1931	10
25 C (77 F): Days with min	7	2	1931	1
10 mm (0.39 in): Days with 10 mm or more rain	61	47	2018	28
25 mm (0.98 in): Days with 25 mm or more rain	61	19	2018	6
50 mm (1.97 in): Days with 50 mm or more rain	50	7	1993	1
100 mm (3.94 in): Days with 100 mm or more rain	6	1	1940	1
10 cm (3.9 in): Days with 10 cm or more snowfall	49	9	2007	1
25 cm (9.8 in): Days with 25 cm or more snowfall	10	1	1934	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1902.

Download the Data

Data for Postville 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Postville Threshold Days by Year (USC00136766)

Key Facts for Postville Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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