Last updated: March 2, 2024
Under the Köppen–Geiger climate classification Iron Mountain features a humid continental climate (Dfb). Temperatures typically range between -9 °C (17 °F) and 21 °C (70 °F) through the year, but rarely can drop to -31 °C (-23 °F) or can rise to as high as 38 °C (101 °F). The average annual precipitation amounts to about 929 mm (36.6 inches) and receives 117 rainy days on the 1 mm (0.04 inches) threshold annually. Iron Mountain enjoys an average of 2901 hours of sunshine throughout the year, and daylight varies from 8 hours 43 minutes to 15 hours 38 minutes per day.
The warmest months in Iron Mountain are June, July and August, with daily mean temperatures ranging from 18 to 21 °C (65 - 70 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -9 to -5 °C (17 - 23 °F) throughout the day. On average each year, Iron Mountain experiences 57 days above 25 °C (77.0 °F) and 161 days below 0 °C (32.0 °F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum | 7°C (44°F) |
15°C (60°F) |
18°C (64°F) |
24°C (75°F) |
34°C (93°F) |
35°C (96°F) |
38°C (101°F) |
32°C (90°F) |
33°C (93°F) |
27°C (81°F) |
24°C (76°F) |
14°C (57°F) |
| Mean maximum | 5°C (40°F) |
8°C (48°F) |
14°C (57°F) |
21°C (70°F) |
30°C (86°F) |
33°C (92°F) |
34°C (94°F) |
31°C (88°F) |
30°C (86°F) |
25°C (77°F) |
15°C (59°F) |
10°C (50°F) |
| Average high | -4°C (24°F) |
-3°C (26°F) |
3°C (38°F) |
10°C (50°F) |
19°C (66°F) |
25°C (77°F) |
27°C (81°F) |
25°C (78°F) |
21°C (70°F) |
13°C (55°F) |
4°C (39°F) |
-1°C (30°F) |
| Daily mean | -8°C (17°F) |
-9°C (17°F) |
-2°C (28°F) |
4°C (39°F) |
12°C (55°F) |
18°C (65°F) |
21°C (70°F) |
19°C (67°F) |
15°C (60°F) |
8°C (46°F) |
-0°C (32°F) |
-5°C (23°F) |
| Average low | -12°C (10°F) |
-14°C (8°F) |
-8°C (19°F) |
-1°C (30°F) |
6°C (44°F) |
12°C (54°F) |
15°C (59°F) |
13°C (56°F) |
10°C (50°F) |
3°C (38°F) |
-4°C (25°F) |
-9°C (16°F) |
| Mean minimum | -25°C (-13°F) |
-25°C (-13°F) |
-20°C (-4°F) |
-10°C (14°F) |
-2°C (30°F) |
7°C (45°F) |
9°C (49°F) |
6°C (43°F) |
2°C (36°F) |
-5°C (24°F) |
-13°C (9°F) |
-23°C (-8°F) |
| Minimum | -31°C (-23°F) |
-30°C (-22°F) |
-24°C (-12°F) |
-16°C (4°F) |
-3°C (27°F) |
3°C (38°F) |
7°C (45°F) |
3°C (38°F) |
-2°C (29°F) |
-6°C (21°F) |
-15°C (5°F) |
-30°C (-22°F) |
Compare temperature, precipitation, sunshine, UV index in Iron Mountain, Michigan, United States with other places around the world.
Iron Mountain usually has the most precipitation in June, July and August, with an average of 12 rainy days and 110 mm (4.3 inches) of precipitation per month. The driest months in Iron Mountain are January, February and March. On average, 43 mm (1.7 inches) of precipitation falls during these months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average precipitation mm (inches) | 33 (1.3) | 49 (1.9) | 48 (1.9) | 90 (3.5) | 85 (3.3) | 108 (4.3) | 103 (4.1) | 118 (4.6) | 90 (3.5) | 99 (3.9) | 51 (2.0) | 55 (2.2) |
| Average precipitation days (≥ 1 mm) | 6 | 9 | 8 | 11 | 11 | 12 | 12 | 12 | 10 | 11 | 7 | 8 |
The sunniest months in Iron Mountain are June, July and August, when the sun shines an average of 11 hours 6 minutes a day. Least sunny months in Iron Mountain: January, November and December receive an average of 4 hours 40 minutes of sunshine daily.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean monthly sunshine hours | 119 | 197 | 242 | 240 | 299 | 341 | 362 | 318 | 266 | 202 | 167 | 141 |
| Mean daily daylight hours | 9h 7m | 10h 22m | 11h 57m | 13h 34m | 14h 57m | 15h 38m | 15h 15m | 14h 1m | 12h 28m | 10h 51m | 9h 27m | 8h 43m |
Iron Mountain experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 9 - 9, which corresponds to the Very High category of sun exposure. January, November and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Iron Mountain UV Index data.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV Index (month maximum) | 2 | 4 | 5 | 7 | 8 | 9 | 9 | 9 | 7 | 5 | 3 | 2 |
Discover in-depth weather details for every month in Iron Mountain. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Iron Mountain's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.
Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.