Illerbrun Threshold Days by Year (CA004023430)

15 fixed thresholds counted per year at Illerbrun (CA004023430): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Illerbrun Thresholds

Illerbrun: days with 10 mm (0.39 in) or more of precipitation in 29 years, most in 1911 with 20.
Illerbrun: days with 10 cm (3.9 in) or more of snowfall in 26 years, most in 1911 with 8.
Illerbrun: days with 25 mm (0.98 in) or more of precipitation in 21 years, most in 1916 with 5.
Illerbrun: days with a maximum temperature at or above 30 C (86 F) in 13 years, most in 1937 with 66.
15 fixed thresholds have at least one qualifying day at Illerbrun.

Days at or above 30 C (86 F)

13 years with a qualifying day

Days per year at Illerbrun with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 66 in 1937.

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

First to last qualifying date each year at Illerbrun
Year	First date	Last date
1935	1935-06-28	1935-09-14
1936	1936-05-26	1936-09-21
1937	1937-04-30	1937-09-13
1938	1938-05-21	1938-09-04
1940	1940-07-12	1940-09-04
1941	1941-05-24	1941-08-23
1942	1942-07-07	1942-09-09
1943	1943-07-03	1943-10-06
1944	1944-05-16	1944-09-07
1945	1945-06-21	1945-09-13
1946	1946-06-21	1946-08-23
1947	1947-07-02	1947-09-12
1948	1948-05-17	1948-09-23

Every Fixed Threshold

Fixed thresholds at Illerbrun
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	13	66	1937	30
35 C (95 F): Days	12	16	1936	5
90 F (32.2 C): Days	13	46	1937	13
100 F (37.8 C): Days	5	5	1936	1
0 C (32 F): Ice days (max	13	101	1940	101
0 C (32 F): Frost days (min	13	209	1948	209
-10 C (14 F): Days with min	13	117	1948	117
-20 C (-4 F): Days with min	13	59	1936	50
-30 C (-22 F): Days with min	12	20	1936	5
-40 C (-40 F): Days with min	3	1	1935	1
20 C (68 F): Tropical nights (min	3	3	1936	1
10 mm (0.39 in): Days with 10 mm or more rain	29	20	1911	7
25 mm (0.98 in): Days with 25 mm or more rain	21	5	1916	2
50 mm (1.97 in): Days with 50 mm or more rain	8	1	1914	1
10 cm (3.9 in): Days with 10 cm or more snowfall	26	8	1911	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1935.

Download the Data

Data for Illerbrun 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).

Year	Days	Decade average
1935	20	40.8
1936	44	40.8
1937	66	40.8
1938	33	40.8
1940	16	26
1941	35	26
1942	18	26
1943	30	26
1944	22	26
1945	25	26
1946	26	26
1947	32	26
1948	30	26

Illerbrun Threshold Days by Year (CA004023430)

Key Facts for Illerbrun Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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