Isle Royale National Park
-9 to 21°C
temperature
2367 hours
sunshine per day
380 mm
rain
149 days
dry
113 days
rain
103 days
snow

Climate of Isle Royale National Park

Isle Royale National Park has a continental climate. It is warm in the summer and cold in the winter. The average annual temperature for Isle Royale National Park is 7° degrees and there is about 379 mm of rain in a year. It is dry for 173 days a year with an average humidity of 81% and an UV-index of 2.

Climate averages for the whole year

  • Day: the average daily temperature during the day is between -9°C and 21°C
  • Night:the average nighttime temperature is between -16°C and 13°C
  • Rain: it rains 113 days and there is a total of approximately 380 mm rainfall
  • Snow: it snows an average of 103 days per year
  • Sun hours: throughout the year there are 2367 sun hours
Maximum temperature: between -9°C and 21°C
Warmest month: 21°C in July
Coldest month: -9°C in January
Night temperature: between -16°C and 13°C
Dry days: 149 days
Days with rain: 113 days
Days with snow: 103 days
Total rain sum: 380 mm
Hours of sunshine: 2367 hours

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Temperature graph

This graph shows the average maximum temperature (red) and minimum temperature (blue) for Isle Royale National Park.

Precipitation graph

This graph shows the average amount of rainfall per month for Isle Royale National Park.

Climate table of Isle Royale National Park

In this climate table you can see at a glance what the average weather per month is for Isle Royale National Park. The data has been collected over a 30-year period, from which an average per month has been derived. From year to year the differences may be larger or smaller, but with this climate table you have a good idea of what the weather for Isle Royale National Park might be like in a given month.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Day temp. (°C) -9 -8 -1 5 12 17 21 21 17 9 2 -6
Night temp. (°C) -16 -15 -8 -2 4 8 12 13 9 4 -3 -11
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Precipitation (mm) 22 27 30 36 39 36 31 26 29 38 36 30
Days with rain 4 4 11 10 13 13 12 11 10 11 9 5
Days with snow 21 20 17 10 1 - - - - 2 12 20
Dry days 6 4 3 10 17 17 19 20 20 18 9 6
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Sun hours per day 3 4 5 7 9 11 11 10 8 6 4 3
Wind force (Bft) 3 3 3 3 2 2 2 2 3 3 3 3
UV-index 1 1 1 2 3 4 5 5 3 2 1 1

Best time to visit Isle Royale National Park

The best time to visit Isle Royale National Park is in July and August. In this period you have a pleasant temperature and almost no precipitation. The highest average temperature in Isle Royale National Park is 21°C in July and the lowest is -9°C in January.

Climate of Isle Royale National Park by month

What is the average climate in a given month for Isle Royale National Park? Click on a month to see all monthly averages for sunshine, maximum and minimum temperatures, percent chance of rain per day, snowfall and number of rainy days.

Isle Royale National Park weather experiences

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