Oelwein 2 S Threshold Days by Year (USC00136200)

18 fixed thresholds counted per year at Oelwein 2 S (USC00136200): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Oelwein 2 S Thresholds

Oelwein 2 S: days with a maximum temperature at or above 30 C (86 F) in 75 years, most in 1931 with 71.
Oelwein 2 S: days with a maximum temperature at or below 0 C (32 F) in 75 years, most in 1978 with 93.
Oelwein 2 S: days with a maximum temperature at or above 90 F (32.2 C) in 73 years, most in 1936 with 51.
Oelwein 2 S: nights with a minimum temperature at or below 0 C (32 F) in 72 years, most in 1952 with 176.
18 fixed thresholds have at least one qualifying day at Oelwein 2 S.

Days at or above 30 C (86 F)

75 years with a qualifying day

Days per year at Oelwein 2 S with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 71 in 1931.

Days at or above 30 C (86 F) per year at Oelwein 2 S
Year	Days	Decade average
1924	15	27.5
1925	37	27.5
1926	24	27.5
1927	32	27.5
1928	24	27.5
1929	33	27.5
1930	50	57.5
1931	71	57.5
1932	38	57.5
1933	70	57.5
1934	64	57.5
1935	55	57.5
1936	70	57.5
1937	51	57.5
1938	43	57.5
1939	63	57.5
1940	44	45.6
1941	56	45.6
1942	44	45.6
1943	57	45.6
1945	23	45.6
1946	31	45.6
1947	53	45.6
1948	50	45.6
1949	52	45.6
1951	18	29.9
1952	27	29.9
1953	27	29.9
1954	35	29.9
1955	55	29.9
1956	33	29.9
1957	26	29.9
1958	13	29.9
1959	35	29.9
1960	26	24.4
1961	29	24.4
1962	22	24.4
1963	27	24.4
1964	41	24.4
1965	19	24.4
1966	26	24.4
1967	14	24.4
1969	16	24.4
1970	31	31.9
1972	28	31.9
1973	28	31.9
1975	44	31.9
1976	39	31.9
1977	25	31.9
1978	37	31.9
1979	23	31.9
1980	48	37.8
1981	16	37.8
1983	58	37.8
1984	32	37.8
1985	32	37.8
1986	18	37.8
1987	42	37.8
1988	62	37.8
1989	32	37.8
1990	15	20.4
1991	34	20.4
1992	9	20.4
1993	8	20.4
1994	18	20.4
1995	35	20.4
1996	10	20.4
1997	20	20.4
1998	24	20.4
1999	31	20.4
2000	19	25.6
2001	30	25.6
2002	41	25.6
2003	30	25.6
2004	8	25.6

For each year, a bar from the first to the last day at Oelwein 2 S meeting 30 C (86 F).

First to last qualifying date each year at Oelwein 2 S
Year	First date	Last date
1924	1924-05-05	1924-08-31
1925	1925-04-22	1925-09-20
1926	1926-04-30	1926-09-17
1927	1927-06-26	1927-10-26
1928	1928-05-09	1928-09-11
1929	1929-05-28	1929-09-27
1930	1930-04-11	1930-10-10
1931	1931-05-15	1931-09-20
1932	1932-05-15	1932-08-30
1933	1933-06-01	1933-09-23
1934	1934-05-02	1934-09-12
1935	1935-06-12	1935-10-13
1936	1936-05-06	1936-09-22
1937	1937-05-29	1937-09-09
1938	1938-06-21	1938-10-09
1939	1939-05-19	1939-10-07
1940	1940-05-13	1940-09-21
1941	1941-05-04	1941-09-21
1942	1942-04-29	1942-09-18
1943	1943-05-28	1943-09-05
1945	1945-06-22	1945-09-07
1946	1946-06-10	1946-08-17
1947	1947-06-09	1947-10-21
1948	1948-05-20	1948-09-19
1949	1949-05-03	1949-08-26
1951	1951-06-16	1951-08-31
1952	1952-04-29	1952-09-30
1953	1953-05-30	1953-10-18
1954	1954-06-11	1954-09-27
1955	1955-05-21	1955-09-18
1956	1956-05-13	1956-08-27
1957	1957-06-16	1957-09-01
1958	1958-06-29	1958-08-30
1959	1959-05-02	1959-09-08
1960	1960-04-22	1960-09-07
1961	1961-06-05	1961-09-10
1962	1962-05-18	1962-09-12
1963	1963-05-08	1963-10-06
1964	1964-04-16	1964-09-09
1965	1965-05-02	1965-08-26
1966	1966-05-26	1966-09-01
1967	1967-05-18	1967-08-01
1969	1969-05-28	1969-08-30
1970	1970-04-28	1970-09-20
1972	1972-05-18	1972-09-16
1973	1973-06-08	1973-09-01
1975	1975-05-18	1975-10-13
1976	1976-06-06	1976-10-03
1977	1977-04-27	1977-08-28
1978	1978-05-25	1978-09-12
1979	1979-05-09	1979-09-11
1980	1980-04-21	1980-09-21
1981	1981-04-27	1981-09-11
1983	1983-06-09	1983-10-02
1984	1984-06-05	1984-09-24
1985	1985-04-18	1985-09-19
1986	1986-04-25	1986-09-26
1987	1987-04-20	1987-08-21
1988	1988-05-21	1988-09-17
1989	1989-05-29	1989-08-22
1990	1990-06-12	1990-10-05
1991	1991-04-06	1991-09-07
1992	1992-05-01	1992-08-09
1993	1993-06-17	1993-08-26
1994	1994-04-18	1994-09-15
1995	1995-06-15	1995-08-30
1996	1996-05-18	1996-08-21
1997	1997-06-15	1997-10-06
1998	1998-05-14	1998-09-13
1999	1999-05-28	1999-09-04
2000	2000-06-01	2000-09-18
2001	2001-05-14	2001-08-10
2002	2002-04-16	2002-09-10
2003	2003-04-15	2003-09-12
2004	2004-04-29	2004-09-13

Every Fixed Threshold

Fixed thresholds at Oelwein 2 S
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	75	71	1931	8
35 C (95 F): Days	47	28	1936	4
40 C (104 F): Days	4	10	1936	1
90 F (32.2 C): Days	73	51	1936	16
100 F (37.8 C): Days	14	24	1936	1
0 C (32 F): Ice days (max	75	93	1978	51
0 C (32 F): Frost days (min	72	176	1952	136
-10 C (14 F): Days with min	72	83	1937	52
-20 C (-4 F): Days with min	72	38	1978	15
-30 C (-22 F): Days with min	31	6	1994	2
20 C (68 F): Tropical nights (min	71	30	1931	6
25 C (77 F): Days with min	7	3	1931	1
10 mm (0.39 in): Days with 10 mm or more rain	72	40	1928	29
25 mm (0.98 in): Days with 25 mm or more rain	72	16	1991	9
50 mm (1.97 in): Days with 50 mm or more rain	52	6	1990	3
100 mm (3.94 in): Days with 100 mm or more rain	7	1	1940	1
10 cm (3.9 in): Days with 10 cm or more snowfall	62	7	1932	2
25 cm (9.8 in): Days with 25 cm or more snowfall	9	2	1962	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1924.

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Data for Oelwein 2 S 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).

Oelwein 2 S Threshold Days by Year (USC00136200)

Key Facts for Oelwein 2 S Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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