Iron River Threshold Days by Year (USC00204093)

17 fixed thresholds counted per year at Iron River (USC00204093): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Iron River Thresholds

Iron River: days with 10 mm (0.39 in) or more of precipitation in 24 years, most in 1911 with 57.
Iron River: days with 25 mm (0.98 in) or more of precipitation in 24 years, most in 1911 with 16.
Iron River: days with a maximum temperature at or above 30 C (86 F) in 20 years, most in 1921 with 48.
Iron River: days with a maximum temperature at or below 0 C (32 F) in 20 years, most in 1900 with 107.
17 fixed thresholds have at least one qualifying day at Iron River.

Days at or above 30 C (86 F)

20 years with a qualifying day

Days per year at Iron River with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 48 in 1921.

Days at or above 30 C (86 F) per year at Iron River
Year	Days	Decade average
1900	11	9.1
1903	3	9.1
1904	4	9.1
1905	4	9.1
1906	16	9.1
1907	5	9.1
1908	16	9.1
1909	14	9.1
1910	27	18
1911	28	18
1912	16	18
1913	18	18
1914	18	18
1915	5	18
1916	27	18
1917	10	18
1918	8	18
1919	23	18
1920	11	29.5
1921	48	29.5

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

First to last qualifying date each year at Iron River
Year	First date	Last date
1900	1900-05-13	1900-08-19
1903	1903-07-07	1903-07-23
1904	1904-07-16	1904-07-27
1905	1905-07-16	1905-08-29
1906	1906-05-17	1906-09-11
1907	1907-06-16	1907-08-11
1908	1908-06-21	1908-09-21
1909	1909-06-20	1909-09-19
1910	1910-06-14	1910-08-21
1911	1911-05-19	1911-08-16
1912	1912-06-10	1912-09-05
1913	1913-06-13	1913-09-06
1914	1914-05-26	1914-09-20
1915	1915-07-13	1915-09-05
1916	1916-07-04	1916-08-20
1917	1917-07-21	1917-07-31
1918	1918-05-05	1918-08-25
1919	1919-05-26	1919-09-07
1920	1920-05-31	1920-09-14
1921	1921-05-20	1921-09-04

Every Fixed Threshold

Fixed thresholds at Iron River
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	20	48	1921	48
35 C (95 F): Days	8	10	1921	10
90 F (32.2 C): Days	18	20	1921	20
100 F (37.8 C): Days	2	1	1911	1
0 C (32 F): Ice days (max	20	107	1900	82
0 C (32 F): Frost days (min	19	229	1917	181
-10 C (14 F): Days with min	19	114	1908	72
-20 C (-4 F): Days with min	19	51	1916	14
-30 C (-22 F): Days with min	19	19	1912	1
-40 C (-40 F): Days with min	3	2	1912	1
20 C (68 F): Tropical nights (min	12	7	1921	7
10 mm (0.39 in): Days with 10 mm or more rain	24	57	1911	23
25 mm (0.98 in): Days with 25 mm or more rain	24	16	1911	4
50 mm (1.97 in): Days with 50 mm or more rain	12	3	1903	1
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1903	1
10 cm (3.9 in): Days with 10 cm or more snowfall	16	10	1911	1
25 cm (9.8 in): Days with 25 cm or more snowfall	3	2	1908	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1900.

Download the Data

Data for Iron River 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).

Iron River Threshold Days by Year (USC00204093)

Key Facts for Iron River Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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