Olin Threshold Days by Year (USC00136225)

19 fixed thresholds counted per year at Olin (USC00136225): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Olin Thresholds

Olin: days with a maximum temperature at or above 30 C (86 F) in 35 years, most in 1921 with 74.
Olin: days with a maximum temperature at or below 0 C (32 F) in 35 years, most in 1937 with 72.
Olin: nights with a minimum temperature at or below 0 C (32 F) in 35 years, most in 1923 with 170.
Olin: nights with a minimum temperature at or below -10 C (14 F) in 35 years, most in 1929 with 73.
19 fixed thresholds have at least one qualifying day at Olin.

Days at or above 30 C (86 F)

35 years with a qualifying day

Days per year at Olin with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 74 in 1921.

Days at or above 30 C (86 F) per year at Olin
Year	Days	Decade average
1899	42	42
1901	56	27.4
1902	20	27.4
1903	18	27.4
1904	16	27.4
1905	26	27.4
1906	38	27.4
1907	18	27.4
1912	42	43.6
1913	63	43.6
1914	54	43.6
1915	10	43.6
1917	40	43.6
1918	43	43.6
1919	53	43.6
1920	45	46.8
1921	74	46.8
1923	50	46.8
1924	25	46.8
1925	57	46.8
1926	36	46.8
1927	52	46.8
1928	38	46.8
1929	44	46.8
1930	64	61.7
1931	74	61.7
1932	47	61.7
1933	70	61.7
1934	71	61.7
1935	56	61.7
1936	50	61.7
1937	61	61.7
1938	60	61.7
1939	64	61.7
1940	53	53

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

First to last qualifying date each year at Olin
Year	First date	Last date
1899	1899-06-04	1899-10-15
1901	1901-04-29	1901-09-07
1902	1902-05-18	1902-08-04
1903	1903-05-22	1903-08-24
1904	1904-06-20	1904-09-28
1905	1905-06-04	1905-09-01
1906	1906-05-17	1906-09-19
1907	1907-06-16	1907-09-16
1912	1912-05-23	1912-09-09
1913	1913-05-28	1913-09-08
1914	1914-05-10	1914-09-06
1915	1915-04-28	1915-08-01
1917	1917-05-17	1917-09-15
1918	1918-05-03	1918-08-28
1919	1919-05-28	1919-09-20
1920	1920-06-08	1920-09-25
1921	1921-05-20	1921-09-05
1923	1923-06-01	1923-09-06
1924	1924-05-05	1924-09-21
1925	1925-04-22	1925-09-23
1926	1926-04-30	1926-09-18
1927	1927-06-08	1927-09-18
1928	1928-05-03	1928-10-11
1929	1929-05-27	1929-09-27
1930	1930-04-10	1930-10-10
1931	1931-05-16	1931-09-21
1932	1932-05-14	1932-09-19
1933	1933-06-02	1933-09-23
1934	1934-05-03	1934-09-25
1935	1935-06-12	1935-09-24
1936	1936-05-06	1936-09-22
1937	1937-05-29	1937-09-23
1938	1938-06-21	1938-10-09
1939	1939-04-24	1939-10-07
1940	1940-05-13	1940-09-21

Every Fixed Threshold

Fixed thresholds at Olin
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	35	74	1921	53
35 C (95 F): Days	27	32	1934	10
40 C (104 F): Days	6	8	1936	2
90 F (32.2 C): Days	34	51	1931	32
100 F (37.8 C): Days	16	16	1936	3
110 F (43.3 C): Days	1	2	1936	2
0 C (32 F): Ice days (max	35	72	1937	62
0 C (32 F): Frost days (min	35	170	1923	151
-10 C (14 F): Days with min	35	73	1929	57
-20 C (-4 F): Days with min	35	35	1936	18
-30 C (-22 F): Days with min	15	7	1936	7
20 C (68 F): Tropical nights (min	35	32	1921	20
25 C (77 F): Days with min	5	2	1901	1
10 mm (0.39 in): Days with 10 mm or more rain	33	47	1919	21
25 mm (0.98 in): Days with 25 mm or more rain	33	20	1921	7
50 mm (1.97 in): Days with 50 mm or more rain	25	4	1907	1
100 mm (3.94 in): Days with 100 mm or more rain	4	1	1906	1
10 cm (3.9 in): Days with 10 cm or more snowfall	11	5	1918	2
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1931	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1899.

Download the Data

Data for Olin 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).

Olin Threshold Days by Year (USC00136225)

Key Facts for Olin Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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