Park climate1991–2020 climate normals188 m source elevationNASA POWER

Annual patterns for temperature, precipitation, humidity, wind, and daylight duration

Isle Royale National Park: monthly climate

Name: Isle Royale National Park monthly climate normals
Creator: NASA POWER

At the representative location for Isle Royale National Park, monthly mean temperatures range from -6.5 to 16 °C (1991–2020). Compare precipitation, humidity, wind, and daylight for each month.

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Annual climate pattern

Comparing monthly temperature averages and daily precipitation rates to trace the long term climate rhythm of Keweenaw County

Annual Temperature and Monthly Precipitation Patterns in Isle Royale National Park

Monthly mean temperatures at the representative park coordinate rise from a low average of -6.54 degrees Celsius in January to a peak average of 15.98 degrees Celsius in August. Corresponding average daily precipitation varies between 0.95 millimeters in February and 2.54 millimeters in June, reflecting long term baseline climatology from 1991 to 2020.

Mean temperatureAverage minimum–maximum rangePrecipitation

Annual mean: 4 °C
Warmest month: August
Coolest month: January
Wettest month: June

Twelve-month climate

Compare long-term monthly averages for temperatures, daily precipitation, wind, and daylight.

Isle Royale National Park Monthly Climate and Weather Normals Comparison

Analyzing the twelve-month climate profile of Isle Royale National Park reveals the shifting balance between average temperature bounds and average daily precipitation rates across the calendar year. Evaluating long-term monthly averages alongside relative humidity, wind speed, and calculated average daylight hours provides a clear climatological overview of the park's offshore island environment.

	Mean temperature	Precipitation	Humidity	Wind speed	Daylight
January	-6.5 °C-17.3° to 2.6°	1.3 mm/day	90.6%	7.3 m/s	8.7 hours
February	-6.5 °C-17.2° to 1.7°	1 mm/day	87.9%	6.8 m/s	10 hours
March	-2.7 °C-13.8° to 5.1°	1.2 mm/day	83%	5.8 m/s	11.6 hours
April	1.8 °C-5.2° to 8.7°	1.8 mm/day	80.5%	5.1 m/s	13.4 hours
May	5.2 °C0.8° to 12.7°	2.3 mm/day	85.4%	4.1 m/s	15 hours
June	8.1 °C3.5° to 15.5°	2.5 mm/day	90.1%	3.6 m/s	15.8 hours
July	12.4 °C6.8° to 18.9°	2.4 mm/day	89.6%	3.7 m/s	15.4 hours
August	16 °C11.7° to 20.7°	2 mm/day	85.1%	4.2 m/s	14 hours
September	13.4 °C7° to 19.1°	2.3 mm/day	82.2%	5.2 m/s	12.3 hours
October	7.7 °C1.4° to 14.1°	2.3 mm/day	79.9%	6.2 m/s	10.5 hours
November	2.1 °C-6.7° to 8.6°	1.7 mm/day	80.9%	6.9 m/s	9 hours
December	-2.9 °C-13.5° to 4.5°	1.5 mm/day	87%	7.2 m/s	8.2 hours

Compare two months

See two months side by side and how much they differ. Both use the same 1991–2020 climate normals and NASA POWER data point as the table above, so they show typical conditions, not a forecast.

First month

Second month

Mean temperature: January: -6.5 °C; August: 16 °C; Change from January to August: +22.5 °C
Precipitation: January: 1.3 mm/day; August: 2 mm/day; Change from January to August: +0.6 mm/day
Daylight: January: 8.7 hours; August: 14 hours; Change from January to August: +5.4 hours

Calculated climate highlights

Analyzing calculated monthly averages for temperature, precipitation, wind, and daylight

Monthly Climate Highlights and Seasonal Contrasts in Isle Royale National Park

Climatological records from a representative Isle Royale coordinate reveal how average temperature, daily precipitation, and wind speeds fluctuate throughout the year. Identifying the warmest, coolest, wettest, and driest periods helps trace seasonal shifts without relying on transient daily weather extremes.

Warmest month: August16 °C
Coolest month: January-6.5 °C
Wettest month: June2.5 mm/day
Driest month: February1 mm/day
Most humid month: January90.6%
Windiest month: January7.3 m/s
Longest daylight: June15.8 hours

Interactive climate map

National park climate map

Open the climate map to compare monthly temperature, precipitation, and other averages.

Global National Park Climate Map

Other park climates

Trace annual temperature patterns and precipitation rhythms across distinct geographic settings

Monthly Climate Profile Comparisons for Isle Royale National Park and Other Reserves

Comparing the monthly climate normals of Isle Royale National Park with other protected areas reveals how regional geography shapes long-term temperature and precipitation cycles. Examining additional variables like humidity, wind speeds, and daylight hours provides a complete framework for analyzing environmental conditions across diverse conservation landscapes.

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