Alpena 1 NW Threshold Days by Year (USC00460143)

14 fixed thresholds counted per year at Alpena 1 NW (USC00460143): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Alpena 1 NW Thresholds

Alpena 1 NW: days with 10 mm (0.39 in) or more of precipitation in 27 years, most in 1956 with 67.
Alpena 1 NW: days with 25 mm (0.98 in) or more of precipitation in 27 years, most in 1956 with 20.
Alpena 1 NW: days with 10 cm (3.9 in) or more of snowfall in 24 years, most in 1962 with 17.
Alpena 1 NW: days with 50 mm (1.97 in) or more of precipitation in 18 years, most in 1959 with 3.
14 fixed thresholds have at least one qualifying day at Alpena 1 NW.

Days at or above 30 C (86 F)

6 years with a qualifying day

Days per year at Alpena 1 NW with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 22 in 1930.

For each year, a bar from the first to the last day at Alpena 1 NW meeting 30 C (86 F).

First to last qualifying date each year at Alpena 1 NW
Year	First date	Last date
1930	1930-06-03	1930-09-24
1931	1931-06-20	1931-09-12
1932	1932-08-31	1932-09-02
1934	1934-06-26	1934-08-09
1939	1939-05-25	1939-09-16
1942	1942-04-30	1942-09-15

Every Fixed Threshold

Fixed thresholds at Alpena 1 NW
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	6	22	1930	10
90 F (32.2 C): Days	6	7	1930	1
0 C (32 F): Ice days (max	7	32	1942	32
0 C (32 F): Frost days (min	6	167	1930	151
-10 C (14 F): Days with min	6	44	1930	32
-20 C (-4 F): Days with min	4	6	1930	3
20 C (68 F): Tropical nights (min	4	2	1939	2
10 mm (0.39 in): Days with 10 mm or more rain	27	67	1956	62
25 mm (0.98 in): Days with 25 mm or more rain	27	20	1956	17
50 mm (1.97 in): Days with 50 mm or more rain	18	3	1959	2
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1931	1
10 cm (3.9 in): Days with 10 cm or more snowfall	24	17	1962	7
25 cm (9.8 in): Days with 25 cm or more snowfall	14	3	1958	3
50 cm (19.7 in): Days with 50 cm or more snowfall	3	1	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 1930.

Download the Data

Data for Alpena 1 NW 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).

Alpena 1 NW Threshold Days by Year (USC00460143)

Key Facts for Alpena 1 NW Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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