Climate and monthly weather forecastGrand Portage, MN
Climate and monthly weather forecast
The climate of Grand Portage
Geographically nestled along the northeastern coast of Minnesota, USA, Grand Portage enjoys a humid continental climate as per the Köppen climate classification. The climate type, signified as Dfb, represents no dry season and warm summer months. Given these climatic conditions, weather shifts throughout the year, swinging between cold winters and moderately warm summers. Such wide variations in weather patterns stem largely from a medley of meteorological parameters.Analyzing temperature data echoes noticeable fluctuations in the city's temperatures. Winters record low temperatures, falling to a chill 3.7°F (-15.7°C) in January, and rising up to 28.8°F (-1.8°C) in April. Contrarily, the mercury climbs to a moderate yet pleasant 70°F (21.1°C) in both July and August, underscoring the pronounced seasonal swing. In terms of precipitation, rainfall evenly spans the yearly calendar, peaking slightly, ranging from 1.06" (27mm) in February to 1.77" (45mm) in October.
Relative humidity hovers around high percentages throughout the year, traceable from 70% in May, reaching up to 90% during January and February. Interestingly, the city experiences a substantial degree of snowfall that sets in from November with 5.08" (129mm), surges to 7.76" (197mm) in January, subsides to 6.5" (165mm) in April before fizzling out in May.
The best time to visit Grand Portage
Grand Portage experiences its warmest and most inviting weather from late June through to the end of August, with the mercury hovering comfortable between 62.2°F (16.8°C) and 70°F (21.1°C). These conditions, paired with the longest daylight hours, ranging from 15.2 in May to 15.6 in July, make this time ideal for outdoor activities and sightseeing. From a sunshine perspective, July presents an ample average of 10.3 daily sunlight hours, promising bright and clear days.The worst time to visit Grand Portage
Considering the harsh winter temperatures, months from November to March pose challenges for visiting Grand Portage. During these months, low temperatures dip down to as frigid as 3.7°F (-15.7°C) in January. Besides, the short daylight periods, with an average of between 8.5 hours in January and December, further limit outdoor activities.Spring weather in Grand Portage
Grand Portage gets a dose of moderate spring weather from April to June, with temperatures rising from 28.8°F (-1.8°C) in early spring to a milder 54.3°F (12.4°C) by June. Among all seasons, spring months witness the highest humidity, approximately 79% in April. The city also receives substantial rainfall during this period, experiencing an average of 1.73" (44mm) in April and 1.77" (45mm) in May.Summer weather in Grand Portage
Summer in Grand Portage, which transpires between July and August, is characterized by pleasantly warm weather with an average temperature peaking at 70°F (21.1°C). The rainfall remains consistent, averaging around 1.61" (41mm). The sunshine hours are the highest, with an average of 10.4 hours in June and 9.4 hours in August, estabilishing a splendid period of clear, sunny weather.Autumn weather in Grand Portage
Autumn, running from September to November, witnesses a steady decline in temperature from 61.7°F (16.5°C) to 34.2°F (1.2°C). Rainfall sees a slight increase, rising from 1.73" (44mm) in September to 1.77" (45mm) in October. Sunshine hours decrease correspondingly, with an average of 7.6 hours in September and 3.9 hours in November.Winter weather in Grand Portage
Winter season in Grand Portage is brutally cold with temperatures veering between 21.6°F (-5.8°C) and 3.7°F (-15.7°C). The city is blanketed by substantial snowfall that begins in November with an average of 5.08" (129mm) and reaches a peak with an average of 7.76" (197mm) in January. Sunshine hours are at their shortest, averaging just 3.2 hours in December. Pressure is relatively stable, though slightly higher with averages between 30" (762mm) in January to 30.05" (763mm) in December.Weather in January
The chill of winter is truly felt in Grand Portage during January. Outdoor enthusiasts start their year with engaging winter activities, exposing themselves to temperatures plummeting to as low as 3.7°F (-15.7°C). Weather conditions include high levels of relative humidity contributing to the overall frosty ambiance. Weather in January »Weather in February
February in Grand Portage continues the reign of winter. The temperature remains cold, but there is a slight increase when compared to January, preparing for the onset of spring. Despite the shortened daylight hours, clear visibility holds firm. Weather in February »Weather in March
Grand Portage welcomes March with mixed signals, still under winter’s grasp yet hinting towards spring. The measurable snowfall reduces to 5.2" (132mm), marking a significant transition as the season progresses. Cloud coverage decreases, promising brighter days ahead. Weather in March »Weather in April
The advent of April brings significant changes in weather, with Grand Portage stepping into spring. It exhibits a substantial drop in snowfall down to just 6.5" (165mm), signaling the retreat of winter. The temperature shows steady improvement as icy weather begins to thaw. Weather in April »Weather in May
May introduces Grand Portage to warmer radiance, with early hints of summer in the air. It marks the end of the snowfall season and a noticeable increase in daylight hours. Slightly increased wind speed accompanies the warmth, stirring a vibrant atmosphere. Weather in May »Weather in June
Summer gracefully takes over in June propelling the inhabitants towards vibrant outdoor life. Consistent daylight hours become a prominent feature, paired with an increase in sea temperature suggestive of summertime beach visits. Rainfall remains moderate indicating no major disruptions to summer outings. Weather in June »Weather in July
July brings the pinnacle of summer to Grand Portage with the peak temperature hitting a high of 70°F (21.1°C). The sea temperature also peaks encouraging recreational activities along the shore. Despite being the warmest month, the pleasant wind speed provides some respite. Weather in July »Weather in August
August in Grand Portage maintains the summer enthusiasm with sustained warmth and a slightly increased relative humidity. The earlier rise in temperature begins to show a downward trend moving towards autumn. Long daylight hours continue to favor outdoor activities and beach outings. Weather in August »Weather in September
September in Grand Portage symbolizes the onset of autumn, bringing a noticeable decline in temperature. Extremes fade, making way for a steady, comfortable weather pattern. The daylight hours start shrinking and residents experience a cumulative increase in cloud cover. Weather in September »Weather in October
October ushers in distinct autumn characteristics in Grand Portage with decreasing temperatures and diminishing daylight hours. The first snow of the season appears, setting a 0.98" (25mm) mark as winter approaches. The sea temperature reflects a significant drop, signaling the halting of water-related activities. Weather in October »Weather in November
November exhibits a complete transition from autumn to winter with the appearance of significant snowfall up to 5.08" (129mm). Days become shorter and the temperature continues to decrease, painting a perfect winter picture. Outdoor activities shift gears to match the frosty surroundings. Weather in November »Weather in December
December is a full-blown winter month in Grand Portage with low temperatures and substantial snowfall up to 7.01" (178mm). The shorter daylight hours contribute to the cold environment. The sea temperature reaches its lower levels, dissuading any water-related engagements. Weather in December »Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
The coldest period in Grand Portage, Minnesota, tends to be January, when average temperatures fluctuate between a high of 16.2°F (-8.8°C) and a low of 3.7°F (-15.7°C).
January and February, with an average relative humidity of 90%, are most humid months in Grand Portage.
The months with the least rainfall in Grand Portage, Minnesota, are January and February Rain falls for 4.5 days and accumulates 1.06" (27mm) of rain.
Throughout the year, in Grand Portage, there are 115 rainfall days, and 18.19" (462mm) of precipitation is accumulated.
January through May, October through December are months with snowfall in Grand Portage, Minnesota.
The month with the most snowfall in Grand Portage, Minnesota, is January, when snow falls for 21.6 days and typically aggregates up to 7.76" (197mm) of snow.
Throughout the year, in Grand Portage, there are 104.1 snowfall days, and 39.84" (1012mm) of snow is accumulated.
The months with the coldest seawater in Grand Portage are January through April, with an average ocean temperature of 35.6°F (2°C).
With an average of 3h of sunshine, January has the least sunshine of the year in Grand Portage, Minnesota.
January through March, November and December, with an average maximum UV index of 1, are months with the lowest UV index.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Grand Portage, Minnesota, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
The least humid month is May, with an average relative humidity of 70%.
The months with the most rainfall in Grand Portage are May and October, with an average 1.77" (45mm) of precipitation.
June through September are months without snowfall.
The month with the longest days in Grand Portage is June, with an average of 16h and 0min of daylight.
With an average of 10.4h of sunshine, June has the most sunshine of the year in Grand Portage, Minnesota.
Grand Portage experiences its warmest period in July and August, averaging a high-temperature of 70°F (21.1°C).
The month with the highest UV index is July, with an average maximum UV index of 5.
August is the month with the warmest seawater in Grand Portage, Minnesota, with an average ocean temperature of 59°F (15°C).
The month with the shortest days is December, with an average of 8h and 30min of daylight.
Average temperature
Grand Portage, MN
The warmest months (with the highest average high temperature) are July and August (70°F).
The month with the lowest average high temperature is January (16.2°F).
The month with the highest average low temperature is August (54.3°F).
The coldest month (with the lowest average low temperature) is January (3.7°F).
Average pressure
Grand Portage, MN
- Average pressure in January:
30.04"Hg - Average pressure in February:
30.08"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
30"Hg - Average pressure in May:
29.97"Hg - Average pressure in June:
29.9"Hg
- Average pressure in July:
29.91"Hg - Average pressure in August:
29.91"Hg - Average pressure in September:
29.98"Hg - Average pressure in October:
29.94"Hg - Average pressure in November:
30"Hg - Average pressure in December:
30.05"Hg
The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed
Grand Portage, MN
- Average wind speed in January:
9.1mph - Average wind speed in February:
8.7mph - Average wind speed in March:
7.9mph - Average wind speed in April:
8mph - Average wind speed in May:
6.9mph - Average wind speed in June:
6.2mph
- Average wind speed in July:
6.3mph - Average wind speed in August:
6.6mph - Average wind speed in September:
7.3mph - Average wind speed in October:
8.5mph - Average wind speed in November:
9mph - Average wind speed in December:
9.2mph
The windiest month (with the highest average wind speed) is December (9.2mph).
The calmest month (with the lowest average wind speed) is June (6.2mph).
Average humidity
Grand Portage, MN
The months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is May (70%).
Average rainfall
Grand Portage, MN
- Average rainfall in January:
1.06" - Average rainfall in February:
1.06" - Average rainfall in March:
1.34" - Average rainfall in April:
1.73" - Average rainfall in May:
1.77" - Average rainfall in June:
1.61"
- Average rainfall in July:
1.61" - Average rainfall in August:
1.61" - Average rainfall in September:
1.73" - Average rainfall in October:
1.77" - Average rainfall in November:
1.5" - Average rainfall in December:
1.38"
The wettest months (with the highest rainfall) are May and October (1.77").
The driest months (with the least rainfall) are January and February (1.06").
Average rainfall days
Grand Portage, MN
- Average rainfall days in January:
4.5 days - Average rainfall days in February:
4.2 days - Average rainfall days in March:
10.6 days - Average rainfall days in April:
10.2 days - Average rainfall days in May:
12.5 days - Average rainfall days in June:
12.8 days
- Average rainfall days in July:
12.9 days - Average rainfall days in August:
11.4 days - Average rainfall days in September:
10.7 days - Average rainfall days in October:
11.3 days - Average rainfall days in November:
8.5 days - Average rainfall days in December:
5.4 days
The month with the highest number of rainy days is July (12.9 days).
The month with the least rainy days is February (4.2 days).
Average snowfall
Grand Portage, MN
The month with the highest snowfall is January (7.76").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Grand Portage, MN
- Average snowfall days in January:
21.6 days - Average snowfall days in February:
19.6 days - Average snowfall days in March:
17.2 days - Average snowfall days in April:
9.7 days - Average snowfall days in May:
1.1 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
2.5 days - Average snowfall days in November:
12.8 days - Average snowfall days in December:
19.6 days
The month with the highest number of snowfall days is January (21.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature
Grand Portage, MN
The best month for swimming (with the highest average sea temperature) is August (59°F).
The coldest months (with the lowest average sea temperature) are January, February, March and April (36°F).
Average daylight / Average sunshine
Grand Portage, MN
- Average daylight in January:
8h and 54min - Average daylight in February:
10h and 18min - Average daylight in March:
11h and 54min - Average daylight in April:
13h and 42min - Average daylight in May:
15h and 12min - Average daylight in June:
16h and 0min
- Average daylight in July:
15h and 36min - Average daylight in August:
14h and 12min - Average daylight in September:
12h and 36min - Average daylight in October:
10h and 48min - Average daylight in November:
9h and 18min - Average daylight in December:
8h and 30min
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:
3h and 0min - Average sunshine in February:
4h and 6min - Average sunshine in March:
4h and 30min - Average sunshine in April:
6h and 18min - Average sunshine in May:
8h and 48min - Average sunshine in June:
10h and 24min
- Average sunshine in July:
10h and 18min - Average sunshine in August:
9h and 24min - Average sunshine in September:
7h and 36min - Average sunshine in October:
5h and 30min - Average sunshine in November:
3h and 54min - Average sunshine in December:
3h and 12min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days
Grand Portage, MN
- Average sunshine days in January:
10.9 days - Average sunshine days in February:
10.8 days - Average sunshine days in March:
9.8 days - Average sunshine days in April:
12.7 days - Average sunshine days in May:
16.6 days - Average sunshine days in June:
16.4 days
- Average sunshine days in July:
17.1 days - Average sunshine days in August:
18 days - Average sunshine days in September:
18.1 days - Average sunshine days in October:
16.7 days - Average sunshine days in November:
13.3 days - Average sunshine days in December:
10.5 days
The month with the most sunshine days is September (18.1 days).
The month with the least sunshine days is March (9.8 days).
Average UV index
Grand Portage, MN
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover
Grand Portage, MN
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility
Grand Portage, MN
The months with the highest visibility are May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March, April and December (5mi).
