Delavan Threshold Days by Year (USC00472050)

16 fixed thresholds counted per year at Delavan (USC00472050): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Delavan Thresholds

Delavan: days with a maximum temperature at or above 30 C (86 F) in 20 years, most in 1921 with 66.
Delavan: days with a maximum temperature at or below 0 C (32 F) in 20 years, most in 1912 with 77.
Delavan: days with a maximum temperature at or above 90 F (32.2 C) in 19 years, most in 1911 with 34.
Delavan: nights with a minimum temperature at or below 0 C (32 F) in 19 years, most in 1917 with 172.
16 fixed thresholds have at least one qualifying day at Delavan.

Days at or above 30 C (86 F)

20 years with a qualifying day

Days per year at Delavan with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 66 in 1921.

Days at or above 30 C (86 F) per year at Delavan
Year	Days	Decade average
1893	32	41.8
1894	53	41.8
1895	46	41.8
1896	36	41.8
1897	48	41.8
1898	36	41.8
1900	53	45.5
1908	38	45.5
1910	46	36.9
1911	52	36.9
1912	31	36.9
1913	41	36.9
1914	40	36.9
1915	13	36.9
1916	45	36.9
1917	22	36.9
1918	30	36.9
1919	49	36.9
1920	39	52.5
1921	66	52.5

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

First to last qualifying date each year at Delavan
Year	First date	Last date
1893	1893-06-12	1893-09-21
1894	1894-06-03	1894-09-02
1895	1895-05-09	1895-09-22
1896	1896-05-09	1896-09-02
1897	1897-06-13	1897-10-15
1898	1898-06-04	1898-09-29
1900	1900-05-12	1900-09-25
1908	1908-06-18	1908-09-26
1910	1910-03-24	1910-09-11
1911	1911-05-10	1911-09-02
1912	1912-05-23	1912-09-09
1913	1913-06-14	1913-09-07
1914	1914-05-25	1914-09-20
1915	1915-04-23	1915-09-13
1916	1916-05-26	1916-09-11
1917	1917-05-17	1917-08-26
1918	1918-05-31	1918-08-27
1919	1919-05-30	1919-09-20
1920	1920-06-08	1920-09-26
1921	1921-05-20	1921-09-04

Every Fixed Threshold

Fixed thresholds at Delavan
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	20	66	1921	66
35 C (95 F): Days	17	17	1916	9
90 F (32.2 C): Days	19	34	1911	32
100 F (37.8 C): Days	5	4	1916	2
0 C (32 F): Ice days (max	20	77	1912	35
0 C (32 F): Frost days (min	19	172	1917	141
-10 C (14 F): Days with min	19	71	1895	31
-20 C (-4 F): Days with min	19	31	1912	1
-30 C (-22 F): Days with min	9	4	1912	1
20 C (68 F): Tropical nights (min	19	18	1916	14
25 C (77 F): Days with min	1	1	1916	1
10 mm (0.39 in): Days with 10 mm or more rain	16	34	1908	32
25 mm (0.98 in): Days with 25 mm or more rain	16	11	1912	9
50 mm (1.97 in): Days with 50 mm or more rain	10	4	1912	2
100 mm (3.94 in): Days with 100 mm or more rain	3	1	1896	1
10 cm (3.9 in): Days with 10 cm or more snowfall	2	3	1918	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1893.

Download the Data

Data for Delavan 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).

Delavan Threshold Days by Year (USC00472050)

Key Facts for Delavan Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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