Park climate1991–2020 climate normals197 m source elevationNASA POWER

Review long-term atmospheric patterns including temperature, precipitation, and daylight rhythms.

Apostle Islands National Lakeshore Monthly Climate Normals, 1991 to 2020 Data Profiles

Name: Apostle Islands National Lakeshore monthly climate normals
Creator: NASA POWER

Analyze the twelve-month climate profile of Apostle Islands National Lakeshore based on NASA POWER records from 1991 to 2020. This data details representative monthly averages for temperature, daily precipitation rates, relative humidity, wind speed, and daylight hours at a fixed coordinate. Understanding these long-term normals provides a foundational view of the annual climatic cycle, distinct from daily weather patterns or localized forecasting.

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A stylized vector illustration showing red layered rock cliffs meeting turquoise water, with green pine trees on the shoreline and a pale sun in the sky.

Annual climate pattern

Long-term monthly temperature averages and daily precipitation rates across twelve months

Apostle Islands National Lakeshore Annual Climate Normals and Monthly Temperature Rhythms

Average minimum, mean, and maximum temperatures at Apostle Islands National Lakeshore move through a twelve-month cycle ranging from sub-zero winter lows to warm summer peaks. Average daily precipitation rates accompany this thermal progression according to NASA Power climatology records gathered at a representative coordinate.

Mean temperatureAverage minimum–maximum rangePrecipitation

Annual mean: 5.3 °C
Warmest month: August
Coolest month: January
Wettest month: June

Twelve-month climate

Track average temperature bounds, daily precipitation rates, humidity, wind, and calculated daylight across the calendar year.

Apostle Islands National Lakeshore Weather by Month: Twelve-Month Climate Comparison

Examine long-term climate normals across all twelve months to analyze shifting temperature ranges and average daily precipitation rates at a representative park coordinate. Compare relative humidity, wind speed, and calculated daylight hours to understand the full annual cycle without relying on single annual averages.

	Mean temperature	Precipitation	Humidity	Wind speed	Daylight
January	-6.2 °C-16° to 2.2°	1.1 mm/day	89.7%	6.5 m/s	8.8 hours
February	-5.9 °C-16° to 2.3°	1.1 mm/day	87.2%	6.1 m/s	10 hours
March	-1.8 °C-12.5° to 7.6°	1.5 mm/day	82.2%	5 m/s	11.7 hours
April	2.8 °C-4.1° to 13.3°	2.5 mm/day	80%	4.6 m/s	13.4 hours
May	7 °C1.1° to 17.4°	3 mm/day	83.5%	3.8 m/s	14.9 hours
June	10.8 °C4.2° to 20.4°	3.4 mm/day	86.9%	3.4 m/s	15.6 hours
July	16 °C9° to 23.8°	3.2 mm/day	84.1%	3.4 m/s	15.3 hours
August	18.2 °C13.3° to 24.9°	2.8 mm/day	80.7%	3.8 m/s	14 hours
September	14.6 °C7.7° to 22.9°	2.8 mm/day	79.3%	4.5 m/s	12.3 hours
October	8.3 °C1.7° to 17°	2.7 mm/day	78.3%	5.4 m/s	10.6 hours
November	2.3 °C-5.6° to 9.7°	1.9 mm/day	80.2%	6 m/s	9.1 hours
December	-2.8 °C-11.8° to 4.2°	1.5 mm/day	86.6%	6.4 m/s	8.4 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: -6.2 °C; August: 18.2 °C; Change from January to August: +24.4 °C
Precipitation: January: 1.1 mm/day; August: 2.8 mm/day; Change from January to August: +1.7 mm/day
Daylight: January: 8.8 hours; August: 14 hours; Change from January to August: +5.2 hours

Calculated climate highlights

Analyzing long-term monthly averages for temperature, precipitation, humidity, wind, and daylight duration

Calculated Monthly Climate Highlights and Comparative Extremes for Apostle Islands National Lakeshore

Calculations identify the warmest, coolest, wettest, driest, most humid, windiest, and longest daylight months from stored climatology records sampled at a representative coordinate. These comparative results summarize annual patterns across twelve averaged periods without representing observed weather extremes or uniform conditions.

Warmest month: August18.2 °C
Coolest month: January-6.2 °C
Wettest month: June3.4 mm/day
Driest month: January1.1 mm/day
Most humid month: January89.7%
Windiest month: January6.5 m/s
Longest daylight: June15.6 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

Month by month atmospheric contrast across distinct park geographies and regional settings

Comparing Apostle Islands National Lakeshore Climate With Other Protected Area Profiles

Standardized monthly climate normals for Apostle Islands National Lakeshore provide a baseline for examining long term temperature, precipitation, and wind patterns across different protected landscapes. Evaluating uniform measurement categories side by side reveals distinct atmospheric rhythms and geographic variations among diverse regional park settings.