May weather forecastGrand Portage, MN
May
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. Plenty of sunshine transforms the cityscape, with outdoor activities becoming more common. The transition concludes with May, handing over to the cherished summer.Temperature
The commencement of May in Grand Portage sees a shift in the average high-temperature, moving from a wintry 40.5°F (4.7°C) in April to a fresh 54.3°F (12.4°C). In Grand Portage, the average low-temperature during the month of May is a cold 39°F (3.9°C).Humidity
The least humid month is May, with an average relative humidity of 70%.Rainfall
The months with the most rainfall in Grand Portage are May and October, with an average 1.77" (45mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Grand Portage. May is the last month it regularly snows. During 1.1 snowfall days, in May, Grand Portage aggregates 0.35" (9mm) of snow. In Grand Portage, during the entire year, snow falls for 104.1 days and aggregates up to 39.84" (1012mm) of snow.Ocean temperature
In Grand Portage, the average seawater temperature in May is 37.4°F (3°C).Note: In terms of swimming, this condition is dangerously life-threatening. Water temperatures cause sharp pain and provoke immediate hyperventilation. A specialized swimsuit is compulsory to alleviate thermal damage.
Daylight
In Grand Portage, the average length of the day in May is 15h and 12min.On the first day of May, sunrise is at 5:39 am and sunset at 8:12 pm. On the last day of the month, sunrise is at 5:03 am and sunset at 8:49 pm CDT.
Sunshine
The average sunshine in May is 8.8h.UV index
The average daily maximum UV index in May in Grand Portage is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: The UV index of 3 in May translates into these instructions:
Adopt protective measures - Suggestions to resist sunburn are offered. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Grand Portage, MN
- Average high temperature in May: 54.3°F
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).
- Average low temperature in May: 39°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 in May
Grand Portage, MN
- Average pressure in May: 29.97"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 in May
Grand Portage, MN
- Average wind speed in May: 6.9mph
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 in May
Grand Portage, MN
- Average humidity in May: 70%
The months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is May (70%).
Average rainfall in May
Grand Portage, MN
- Average rainfall in May: 1.77"
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 in May
Grand Portage, MN
- Average rainfall days in May: 12.5 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 in May
Grand Portage, MN
- Average snowfall in May: 0.35"
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 in May
Grand Portage, MN
- Average snowfall days in May: 1.1 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 in May
Grand Portage, MN
- Average sea temperature in May: 37°F
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 in May /
Average sunshine in May
Grand Portage, MN
- Average daylight in May: 15h and 12min
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 May: 8h and 48min
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 in May
Grand Portage, MN
- Average sunshine days in May: 16.6 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 in May
Grand Portage, MN
- Average UV index in May: 3
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 in May
Grand Portage, MN
- Average cloud cover in May: 42
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 in May
Grand Portage, MN
- Average visibility in May: 6mi
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).
