Climate and monthly weather forecastGrand Isle, ME
Climate and monthly weather forecast
Weather in January
January, the same as December, in Grand Isle, Maine, is another subzero cold winter month, with an average temperature varying between 18°F (-7.8°C) and 2.8°F (-16.2°C). Grand Isle witnesses the coldest weather in January, with temperatures averaging a high of 18°F (-7.8°C) and a low of 2.8°F (-16.2°C). Weather in January »Weather in February
February, the last month of the winter in Grand Isle, is another freezing cold month, with an average temperature ranging between max 20.3°F (-6.5°C) and min 3.6°F (-15.8°C). With the transition into February, Grand Isle notes an average high-temperature of a still freezing cold 20.3°F (-6.5°C), closely resembling January. Weather in February »Weather in March
March, the first month of the spring in Grand Isle, is also a subzero cold month, with an average temperature ranging between max 27.7°F (-2.4°C) and min 11.7°F (-11.3°C). The commencement of March sees a minor shift in the average high-temperature, moving from 20.3°F (-6.5°C) in February to a still freezing cold 27.7°F (-2.4°C). Weather in March »Weather in April
April is a wintry spring month in Grand Isle, Maine, with temperature in the range of an average low of 26.1°F (-3.3°C) and an average high of 40.8°F (4.9°C). With the onset of April, Grand Isle experiences a temperature shift, with the average high-temperature moving from a subzero cold 27.7°F (-2.4°C) in March to a cold 40.8°F (4.9°C). Weather in April »Weather in May
The last month of the spring, May, is a refreshing month in Grand Isle, Maine, with an average temperature fluctuating between 39.6°F (4.2°C) and 58.8°F (14.9°C). The arrival of May brings a distinct temperature shift, with the average high-temperature escalating from an icy 40.8°F (4.9°C) in April to a refreshing 58.8°F (14.9°C). Weather in May »Weather in June
The first month of the summer, June, is a refreshing month in Grand Isle, Maine, with an average temperature ranging between min 47.3°F (8.5°C) and max 67.5°F (19.7°C). June brings a slight increase in the average high-temperature, progressing from a moderate 58.8°F (14.9°C) in May to a still refreshing 67.5°F (19.7°C). Weather in June »Weather in July
July in Grand Isle, Maine, is a warm summer month, with an average temperature fluctuating between 74.3°F (23.5°C) and 53.6°F (12°C). In Grand Isle, temperatures reach their average annual highs in July, measuring 74.3°F (23.5°C) and a minimum average of 53.6°F (12°C). Weather in July »Weather in August
August, the last month of the summer in Grand Isle, is also an agreeable month, with an average temperature fluctuating between 72.3°F (22.4°C) and 52.7°F (11.5°C). The average high-temperature in August, at a pleasant 72.3°F (22.4°C), reveals a modest deviation from July's 74.3°F (23.5°C). Weather in August »Weather in September
September, the first month of the autumn in Grand Isle, is still a comfortable month, with an average temperature ranging between min 45.1°F (7.3°C) and max 63.5°F (17.5°C). The arrival of September signals a subtle shift in temperature, down from an agreeable 72.3°F (22.4°C) in August to an enjoyable 63.5°F (17.5°C). Weather in September »Weather in October
October, like September, is another chilly autumn month in Grand Isle, Maine, with an average temperature ranging between min 36°F (2.2°C) and max 49.5°F (9.7°C). The start of October involves a temperature drop, moving from an enjoyable 63.5°F (17.5°C) in September to a frosty 49.5°F (9.7°C). Weather in October »Weather in November
The last month of the autumn, November, is another cold month in Grand Isle, Maine, with an average temperature varying between 25.2°F (-3.8°C) and 36.5°F (2.5°C). A moderate decline in the average high-temperature is seen during November, decreasing from a chilly 49.5°F (9.7°C) in October to a wintry 36.5°F (2.5°C). Weather in November »Weather in December
December, the first month of the winter in Grand Isle, is still a freezing cold month, with an average temperature varying between 23.9°F (-4.5°C) and 12.2°F (-11°C). The onset of December results in a decrease in the average high-temperature, receding from a cold 36.5°F (2.5°C) in November to a freezing cold 23.9°F (-4.5°C). Weather in December »Updated: Jul 1, 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
Grand Isle's coldest weather arrives in January, when temperatures average a high of 18°F (-7.8°C) and a low of 2.8°F (-16.2°C).
Throughout the year, there are 140.8 rainfall days, and 30.12" (765mm) of precipitation is accumulated.
Months with snowfall in Grand Isle are January through May, October through December.
The month with the most snowfall is January, when snow falls for 21.3 days and typically aggregates up to 14.92" (379mm) of snow.
Throughout the year, there are 107.8 snowfall days, and 71.34" (1812mm) of snow is accumulated.
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 1.
February is the month with the least rainfall. Rain falls for 4.3 days and accumulates 1.97" (50mm) of precipitation.
February has the least sunshine of the year, with an average of 2.1h of sunshine.
With an average relative humidity of 94%, March is the most humid month.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
The month with the most rainfall is April, when the rain falls for 14 days and typically aggregates up to 2.95" (75mm) of precipitation.
The least humid month is May, with an average relative humidity of 76%.
In Grand Isle, snow does not fall in June through September.
With an average of 15h and 54min of daylight, June has the longest days of the year.
June and July, with an average maximum UV index of 5, are months with the highest UV index.
In Grand Isle, temperatures reach their average annual highs in July, measuring 74.3°F (23.5°C) and a minimum average of 53.6°F (12°C).
With an average of 9.5h of sunshine, August has the most sunshine of the year.
December has the shortest days of the year, with an average of 8h and 30min of daylight.
Average temperature
Grand Isle, ME
The warmest month (with the highest average high temperature) is July (74.3°F).
The month with the lowest average high temperature is January (18°F).
The month with the highest average low temperature is July (53.6°F).
The coldest month (with the lowest average low temperature) is January (2.8°F).
Average pressure
Grand Isle, ME
- Average pressure in January:
29.94"Hg - Average pressure in February:
29.94"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
29.94"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.88"Hg
- Average pressure in July:
29.89"Hg - Average pressure in August:
29.92"Hg - Average pressure in September:
30.01"Hg - Average pressure in October:
29.97"Hg - Average pressure in November:
30.01"Hg - Average pressure in December:
30"Hg
The months with the highest atmospheric pressure are March, September and November (30.01"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed
Grand Isle, ME
- Average wind speed in January:
8.2mph - Average wind speed in February:
8.2mph - Average wind speed in March:
8.1mph - Average wind speed in April:
7.9mph - Average wind speed in May:
7.5mph - Average wind speed in June:
6.8mph
- Average wind speed in July:
6.6mph - Average wind speed in August:
6.4mph - Average wind speed in September:
6.8mph - Average wind speed in October:
7.5mph - Average wind speed in November:
8mph - Average wind speed in December:
7.7mph
The windiest months (with the highest average wind speed) are January and February (8.2mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity
Grand Isle, ME
The month with the highest relative humidity is March (94%).
The month with the lowest relative humidity is May (76%).
Average rainfall
Grand Isle, ME
- Average rainfall in January:
2.48" - Average rainfall in February:
1.97" - Average rainfall in March:
2.44" - Average rainfall in April:
2.95" - Average rainfall in May:
2.76" - Average rainfall in June:
2.52"
- Average rainfall in July:
2.64" - Average rainfall in August:
2.32" - Average rainfall in September:
2.05" - Average rainfall in October:
2.76" - Average rainfall in November:
2.48" - Average rainfall in December:
2.76"
The wettest month (with the highest rainfall) is April (2.95").
The driest month (with the least rainfall) is February (1.97").
Average rainfall days
Grand Isle, ME
- Average rainfall days in January:
4.3 days - Average rainfall days in February:
4.3 days - Average rainfall days in March:
6.8 days - Average rainfall days in April:
14 days - Average rainfall days in May:
16.6 days - Average rainfall days in June:
15.9 days
- Average rainfall days in July:
17.1 days - Average rainfall days in August:
16.2 days - Average rainfall days in September:
13.1 days - Average rainfall days in October:
14.6 days - Average rainfall days in November:
10.1 days - Average rainfall days in December:
7.8 days
The month with the highest number of rainy days is July (17.1 days).
The months with the least rainy days are January and February (4.3 days).
Average snowfall
Grand Isle, ME
- Average snowfall in January:
14.92" - Average snowfall in February:
12.36" - Average snowfall in March:
13.62" - Average snowfall in April:
7.95" - Average snowfall in May:
0.87" - Average snowfall in June:
0"
The month with the highest snowfall is January (14.92").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Grand Isle, ME
- Average snowfall days in January:
21.3 days - Average snowfall days in February:
20.6 days - Average snowfall days in March:
20.4 days - Average snowfall days in April:
12.3 days - Average snowfall days in May:
1.2 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:
3.3 days - Average snowfall days in November:
10.9 days - Average snowfall days in December:
17.8 days
The month with the highest number of snowfall days is January (21.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Grand Isle, ME
- Average daylight in January:
9h and 0min - 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 6min - Average daylight in June:
15h and 54min
- Average daylight in July:
15h and 30min - Average daylight in August:
14h and 12min - Average daylight in September:
12h and 30min - Average daylight in October:
10h and 54min - Average daylight in November:
9h and 18min - Average daylight in December:
8h and 30min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in January:
2h and 30min - Average sunshine in February:
2h and 6min - Average sunshine in March:
3h and 0min - Average sunshine in April:
5h and 12min - Average sunshine in May:
7h and 36min - Average sunshine in June:
8h and 24min
- Average sunshine in July:
9h and 18min - Average sunshine in August:
9h and 30min - Average sunshine in September:
7h and 18min - Average sunshine in October:
5h and 24min - Average sunshine in November:
4h and 0min - Average sunshine in December:
2h and 54min
The month with the most sunshine is August (Average sunshine: 9h and 30min).
The month with the least sunshine is February (Average sunshine: 2h and 6min).
Average sunshine days
Grand Isle, ME
- Average sunshine days in January:
10.3 days - Average sunshine days in February:
8.6 days - Average sunshine days in March:
8.8 days - Average sunshine days in April:
7.9 days - Average sunshine days in May:
12.1 days - Average sunshine days in June:
12.7 days
- Average sunshine days in July:
12.1 days - Average sunshine days in August:
13 days - Average sunshine days in September:
14.5 days - Average sunshine days in October:
12.5 days - Average sunshine days in November:
12.2 days - Average sunshine days in December:
11.5 days
The month with the most sunshine days is September (14.5 days).
The month with the least sunshine days is April (7.9 days).
Average UV index
Grand Isle, ME
The months with the highest UV index are June and 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 Isle, ME
The month with the most cloud cover is February (Cloud cover 75).
The month with the least cloud cover is July (Cloud cover 42).
Average visibility
Grand Isle, ME
The months with the highest visibility are May, June, July, August, September, October and November (5mi).
The months with the lowest visibility are January, February, March, April and December (4mi).
