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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

Mackinac Island Threshold Days by Year (USC00204997)

15 fixed thresholds counted per year at Mackinac Island (USC00204997): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mackinac Island Thresholds

  • Mackinac Island: days with a maximum temperature at or below 0 C (32 F) in 32 years, most in 1904 with 92.
  • Mackinac Island: nights with a minimum temperature at or below 0 C (32 F) in 28 years, most in 1934 with 198.
  • Mackinac Island: nights with a minimum temperature at or below -10 C (14 F) in 28 years, most in 1924 with 91.
  • Mackinac Island: nights with a minimum temperature at or below -20 C (-4 F) in 26 years, most in 1934 with 31.
  • 15 fixed thresholds have at least one qualifying day at Mackinac Island.
22 years with a qualifying day
Days at or above 30 C (86 F) per year at Mackinac Island Days per year at Mackinac Island with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 11 in 1911. 0510151901: 31906: 31909: 21911: 111912: 61913: 31914: 31915: 11916: 111917: 81918: 41919: 91921: 71922: 11925: 31927: 21928: 21929: 21930: 21931: 71932: 31938: 319011911191419171921192719301938
Days per year at Mackinac Island with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 11 in 1911.
Days at or above 30 C (86 F) per year at Mackinac Island
YearDaysDecade average
190132.7
190632.7
190922.7
1911116.2
191266.2
191336.2
191436.2
191516.2
1916116.2
191786.2
191846.2
191996.2
192172.8
192212.8
192532.8
192722.8
192822.8
192922.8
193023.8
193173.8
193233.8
193833.8
First to last qualifying date each year at Mackinac Island For each year, a bar from the first to the last day at Mackinac Island meeting 30 C (86 F). 1901: 1 July 1901 to 16 July 19011906: 16 August 1906 to 7 September 19061909: 24 August 1909 to 25 August 19091911: 2 July 1911 to 12 July 19111912: 3 July 1912 to 9 July 19121913: 15 August 1913 to 17 August 19131914: 14 July 1914 to 9 August 19141915: 14 September 1915 to 14 September 19151916: 19 July 1916 to 20 August 19161917: 22 July 1917 to 1 August 19171918: 21 July 1918 to 22 August 19181919: 13 June 1919 to 26 July 19191921: 3 July 1921 to 12 July 19211922: 16 August 1922 to 16 August 19221925: 7 June 1925 to 18 August 19251927: 15 September 1927 to 16 September 19271928: 8 July 1928 to 16 August 19281929: 27 July 1929 to 4 September 19291930: 2 August 1930 to 3 August 19301931: 30 June 1931 to 12 September 19311932: 25 July 1932 to 31 August 19321938: 2 August 1938 to 14 August 193819011911191419171921192719301938JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Mackinac Island meeting 30 C (86 F).
First to last qualifying date each year at Mackinac Island
YearFirst dateLast date
19011901-07-011901-07-16
19061906-08-161906-09-07
19091909-08-241909-08-25
19111911-07-021911-07-12
19121912-07-031912-07-09
19131913-08-151913-08-17
19141914-07-141914-08-09
19151915-09-141915-09-14
19161916-07-191916-08-20
19171917-07-221917-08-01
19181918-07-211918-08-22
19191919-06-131919-07-26
19211921-07-031921-07-12
19221922-08-161922-08-16
19251925-06-071925-08-18
19271927-09-151927-09-16
19281928-07-081928-08-16
19291929-07-271929-09-04
19301930-08-021930-08-03
19311931-06-301931-09-12
19321932-07-251932-08-31
19381938-08-021938-08-14

Every Fixed Threshold

Fixed thresholds at Mackinac Island
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days221119113
35 C (95 F): Days3319111
90 F (32.2 C): Days9719112
0 C (32 F): Ice days (max3292190472
0 C (32 F): Frost days (min281981934142
-10 C (14 F): Days with min2891192456
-20 C (-4 F): Days with min263119348
-30 C (-22 F): Days with min6319182
20 C (68 F): Tropical nights (min15919163
25 C (77 F): Days with min1119181
10 mm (0.39 in): Days with 10 mm or more rain2052190433
25 mm (0.98 in): Days with 25 mm or more rain202119055
50 mm (1.97 in): Days with 50 mm or more rain9519051
10 cm (3.9 in): Days with 10 cm or more snowfall10819093
25 cm (9.8 in): Days with 25 cm or more snowfall2119051

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1901.

Download the Data

  • Data for Mackinac Island 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 . Last revised (2025-12-31).