January weather forecast
Isle Royale National Park, MI

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Calm evening waters at the Rock Harbor in Isle Royale National Park, Michigan, USA
Calm evening waters at the Rock Harbor in Isle Royale National Park, Michigan, USA

Weather in January

January in Isle Royale National Park, Michigan, witnesses winter at its peak. The chilly weather continues from December, making it the coldest month of the year. Surprisingly, despite the cold, a moderate amount of rainfall is observed with precipitation for 10 days. The temperatures lie between 0°F (-17.8°C) and 18°F (-7.8°C), marking the lowest point for the year. The chilly winds, combined with scarce sunlight of approximately 8.9 hours a day, contribute to the freezing atmosphere.

Temperature

The coldest period in Isle Royale National Park, Michigan, is January, when temperatures fluctuate between an average high of 17.6°F (-8°C) and a low of -0.4°F (-18°C).

Rainfall

In January, in Isle Royale National Park, the rain falls for 10 days. Throughout January, 2.48" (63mm) of precipitation is accumulated. Throughout the year, there are 125 rainfall days, and 30.55" (776mm) of precipitation is accumulated.

Ocean temperature

The months with the coldest seawater are January through April, with an average ocean temperature of 35.6°F (2°C).
Note: In the activity of swimming, this state poses an instant danger to life. Breathing control is completely lost, impeding any form of clear thinking. Employing a specialized swimsuit is crucial to minimize thermal loss.

Daylight

The average length of the day in January is 8h and 55min.
On the first day of the month, sunrise is at 8:45 am and sunset at 5:12 pm. On the last day of January, sunrise is at 8:24 am and sunset at 5:53 pm EST.

Sunshine

The average sunshine in January in Isle Royale National Park is 4h.

UV index

January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Isle Royale National Park. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: In January, a daily maximum UV index of 1 leads to the following instructions:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
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Frequently asked questions

What are the coldest months in Isle Royale National Park?

With average high and low temperatures of 17.6°F (-8°C) and -0.4°F (-18°C) respectively, January is Isle Royale National Park's coldest month.

How cold is January in Isle Royale National Park?

In January, the average high-temperature and low-temperature in Isle Royale National Park, Michigan, are 17.6°F (-8°C) and -0.4°F (-18°C) respectively.

How many days does it rain in January in Isle Royale National Park?

In Isle Royale National Park, during January, the rain falls for 10 days and regularly aggregates up to 2.48" (63mm) of precipitation.

When is the ocean coldest in Isle Royale National Park?

January through April, with an average ocean temperature of 35.6°F (2°C), are months with the coldest seawater in Isle Royale National Park, Michigan.

What is the water temperature in January in Isle Royale National Park?

In Isle Royale National Park, the average seawater temperature in January is 35.6°F (2°C). For swimming, this is considered extremely cold, dangerous, and life-threatening. Unless suitably protected with insulated waterproof clothing, hypothermia quickly occurs.

What is the average length of the day in January in Isle Royale National Park?

In January, the average day length in Isle Royale National Park is 8h and 55min.

When is the sunrise / sunset in January in Isle Royale National Park?

On the first day of January in Isle Royale National Park, sunrise is at 8:45 am and sunset at 5:12 pm. On the last day of the month, sunrise is at 8:24 am and sunset at 5:53 pm EST.

How many hours of sunshine does Isle Royale National Park have in January?

The average sunshine duration in January in Isle Royale National Park, Michigan, is 4h.

What is the month with the lowest UV index in Isle Royale National Park?

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 1.

What is the UV index intensity in January in Isle Royale National Park?

The average daily maximum UV index in January in Isle Royale National Park is 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation.
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in January
Isle Royale National Park, MI

Average temperature in January - Isle Royale National Park, MI
  • Average high temperature in January: 18°F

The warmest month (with the highest average high temperature) is July (75°F).
The month with the lowest average high temperature is January (18°F).

  • Average low temperature in January: 0°F

The month with the highest average low temperature is July (54°F).
The coldest month (with the lowest average low temperature) is January (0°F).

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Average rainfall in January
Isle Royale National Park, MI

Average rainfall in January - Isle Royale National Park, MI
  • Average rainfall in January: 2.5"

The wettest month (with the highest rainfall) is September (3.4").
The driest month (with the least rainfall) is February (1.5").

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Average rainfall days in January
Isle Royale National Park, MI

Average rainfall days in January - Isle Royale National Park, MI
  • Average rainfall days in January: 10 days

The months with the highest number of rainy days are June and September (13 days).
The months with the least rainy days are February and April (8 days).

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Average sea temperature in January
Isle Royale National Park, MI

Average sea temperature in January - Isle Royale National Park, MI
  • Average sea temperature in January: 36°F

The best month for swimming (with the highest average sea temperature) is August (55°F).
The coldest months (with the lowest average sea temperature) are January, February, March and April (36°F).

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Average daylight in January /
Average sunshine in January
Isle Royale National Park, MI

Average daylight in January / Average sunshine in January - Isle Royale National Park, MI
  • Average daylight in January: 8h and 5min

The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in January: 4h

The month with the most sunshine is July (Average sunshine: 10h).
The months with the least sunshine are November and December (Average sunshine: 3h).

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Average UV index in January
Isle Royale National Park, MI

Average UV index in January - Isle Royale National Park, MI
  • Average UV index in January: 1

The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 1).

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Isle Royale National Park, Michigan, USA

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