Climate and monthly weather forecast
Grand Isle, VT

Weather in January

January, the same as December, in Grand Isle, Vermont, is another subzero cold winter month, with an average temperature ranging between min 12°F (-11.1°C) and max 24.3°F (-4.3°C). The coldest month is January, with an average high-temperature of 24.3°F (-4.3°C) and an average low-temperature of 12°F (-11.1°C). Weather in January »

Weather in February

February, the last month of the winter in Grand Isle, is also a subzero cold month, with an average temperature fluctuating between 27°F (-2.8°C) and 13.8°F (-10.1°C). In February, the average high-temperature is essentially the same as in January - a still subzero cold 27°F (-2.8°C). Weather in February »

Weather in March

The first month of the spring, March, is a cold month in Grand Isle, Vermont, with an average temperature fluctuating between 35.6°F (2°C) and 22.5°F (-5.3°C). In Grand Isle, Vermont, the average high-temperature in March marginally rises from a subzero cold 27°F (-2.8°C) in February to a cold 35.6°F (2°C). Weather in March »

Weather in April

April in Grand Isle, Vermont, is a chilly spring month, with an average temperature fluctuating between 34.2°F (1.2°C) and 49.6°F (9.8°C). In April, the average high-temperature increases from a cold 35.6°F (2°C) in March to a frosty 49.6°F (9.8°C). Weather in April »

Weather in May

May, the last month of the spring in Grand Isle, is a comfortable month, with an average temperature varying between 46°F (7.8°C) and 64.2°F (17.9°C). In May, the average high-temperature significantly increases from a chilly 49.6°F (9.8°C) in April to a comfortable 64.2°F (17.9°C). Weather in May »

Weather in June

The first month of the summer, June, is a pleasant month in Grand Isle, Vermont, with an average temperature ranging between min 52.9°F (11.6°C) and max 71.1°F (21.7°C). In Grand Isle, Vermont, the average high-temperature in June slightly increases from an enjoyable 64.2°F (17.9°C) in May to an agreeable 71.1°F (21.7°C). Weather in June »

Weather in July

July in Grand Isle, Vermont, is a warm summer month, with an average temperature varying between 77.5°F (25.3°C) and 59.4°F (15.2°C). With an average high-temperature of 77.5°F (25.3°C) and an average low-temperature of 59.4°F (15.2°C), July is the warmest month. Weather in July »

Weather in August

August, the last month of the summer in Grand Isle, is another warm month, with an average temperature varying between 75.9°F (24.4°C) and 57.6°F (14.2°C). In August, the average high-temperature is practically the same as in July - a still moderately hot 75.9°F (24.4°C). Weather in August »

Weather in September

September, the first month of the autumn in Grand Isle, is still a pleasant month, with an average temperature varying between 68.9°F (20.5°C) and 50.7°F (10.4°C). In September, the average high-temperature marginally drops from a warm 75.9°F (24.4°C) in August to an agreeable 68.9°F (20.5°C). Weather in September »

Weather in October

October, the same as September, in Grand Isle, Vermont, is a moderate autumn month, with an average temperature varying between 41.9°F (5.5°C) and 55.4°F (13°C). In Grand Isle, the average high-temperature in October drops from a pleasant 68.9°F (20.5°C) in September to a moderate 55.4°F (13°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a wintry month in Grand Isle, Vermont, with an average temperature varying between 41.9°F (5.5°C) and 30.2°F (-1°C). In Grand Isle, the average high-temperature in November decreases from a mild 55.4°F (13°C) in October to a wintry 41.9°F (5.5°C). Weather in November »

Weather in December

December, the first month of the winter in Grand Isle, is still a freezing cold month, with temperature in the range of an average low of 20.7°F (-6.3°C) and an average high of 30.6°F (-0.8°C). In Grand Isle, the average high-temperature in December decreases from a cold 41.9°F (5.5°C) in November to a subzero cold 30.6°F (-0.8°C). Weather in December »
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FAQ

What is the coldest month in Grand Isle?

January is the coldest month in Grand Isle, Vermont, with an average high-temperature of 24.3°F (-4.3°C) and an average low-temperature of 12°F (-11.1°C).

What are the most humid months in Grand Isle?

The months with the highest humidity in Grand Isle are January and February, with an average relative humidity of 87%.

How much does it rain in Grand Isle?

In Grand Isle, Vermont, during the entire year, the rain falls for 176.9 days and collects up to 29.88" (759mm) of precipitation.

When does it snow in Grand Isle?

January through May, October through December are months with snowfall in Grand Isle.

How many days does it snow in Grand Isle?

In Grand Isle, during the entire year, snow falls for 81.9 days and aggregates up to 36.77" (934mm) of snow.

What is the snowiest month in Grand Isle?

February is the month with the most snowfall in Grand Isle, Vermont. Snow falls for 19.2 days and accumulates 9.49" (241mm) of snow.

What is the month with the least sunshine in Grand Isle?

With an average of 3.4h of sunshine, February has the least sunshine of the year in Grand Isle.

When is Daylight Saving Time (DST) in Grand Isle?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts in Grand Isle, Vermont, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from EDT to EST.

What is the least humid month in Grand Isle?

April and May, with an average relative humidity of 76%, are the least humid months in Grand Isle, Vermont.

When is the highest UV index in Grand Isle?

The months with the highest UV index in Grand Isle are May through August, with an average maximum UV index of 5.

What is the wettest month in Grand Isle?

The month with the most rainfall in Grand Isle, Vermont, is June, when the rain falls for 18.8 days and typically aggregates up to 3.23" (82mm) of precipitation.

When it does not snow in Grand Isle?

In Grand Isle, Vermont, snow does not fall in June through September.

When are the longest days in Grand Isle?

June has the longest days of the year, with an average of 15h and 31min of daylight.

What is the warmest month in Grand Isle?

With an average high-temperature of 77.5°F (25.3°C) and an average low-temperature of 59.4°F (15.2°C), July is the warmest month.

What month has the most sunshine in Grand Isle?

The month with the most sunshine in Grand Isle, Vermont, is August, with an average of 10.5h of sunshine.

What is the driest month in Grand Isle?

The month with the least rainfall in Grand Isle, Vermont, is September, when the rain falls for 12.5 days and typically collects 1.81" (46mm) of precipitation.

What is the month with the shortest days in Grand Isle?

The month with the shortest days in Grand Isle, Vermont, is December, with an average of 8h and 52min of daylight.

When is the lowest UV index in Grand Isle?

The month with the lowest UV index in Grand Isle, Vermont, is December, with an average maximum UV index of 1.

Average temperature
Grand Isle, VT

Average temperature - Grand Isle, VT

The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (24.3°F).

The month with the highest average low temperature is July (59.4°F).
The coldest month (with the lowest average low temperature) is January (12°F).

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Average pressure
Grand Isle, VT

Average pressure - Grand Isle, VT

The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed
Grand Isle, VT

Average wind speed - Grand Isle, VT

The windiest month (with the highest average wind speed) is April (8mph).
The calmest months (with the lowest average wind speed) are July and August (6.1mph).

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Average humidity
Grand Isle, VT

Average humidity - Grand Isle, VT

The months with the highest relative humidity are January and February (87%).
The months with the lowest relative humidity are April and May (76%).

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Average rainfall
Grand Isle, VT

Average rainfall - Grand Isle, VT

The wettest month (with the highest rainfall) is June (3.23").
The driest month (with the least rainfall) is September (1.81").

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Average rainfall days
Grand Isle, VT

Average rainfall days - Grand Isle, VT

The month with the highest number of rainy days is June (18.8 days).
The month with the least rainy days is January (9.4 days).

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Average snowfall
Grand Isle, VT

Average snowfall - Grand Isle, VT

The month with the highest snowfall is February (9.49").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Grand Isle, VT

Average snowfall days - Grand Isle, VT

The month with the highest number of snowfall days is January (19.4 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Grand Isle, VT

Average daylight / Average sunshine - Grand Isle, VT

The month with the longest days is June (Average daylight: 15h and 31min).
The month with the shortest days is December (Average daylight: 8h and 52min).

The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 3h and 24min).

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Average sunshine days
Grand Isle, VT

Average sunshine days - Grand Isle, VT

The month with the most sunshine days is September (15.3 days).
The month with the least sunshine days is February (6.5 days).

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Average visibility
Grand Isle, VT

Average visibility - Grand Isle, VT

The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January and February (4mi).

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