Climate and monthly weather forecast
Alton Bay, NH

Weather in January

January, the same as December, in Alton Bay, New Hampshire, is a freezing cold winter month, with an average temperature varying between 26.1°F (-3.3°C) and 12.9°F (-10.6°C). The coldest month is January, with an average high-temperature of 26.1°F (-3.3°C) and an average low-temperature of 12.9°F (-10.6°C). Weather in January »

Weather in February

February, the last month of the winter in Alton Bay, is also a subzero cold month, with an average temperature ranging between min 14.4°F (-9.8°C) and max 29.3°F (-1.5°C). In Alton Bay, the average high-temperature in February is almost the same as in January - a still subzero cold 29.3°F (-1.5°C). Weather in February »

Weather in March

The first month of the spring, March, is a wintry month in Alton Bay, New Hampshire, with an average temperature ranging between max 37.9°F (3.3°C) and min 22.5°F (-5.3°C). In Alton Bay, the average high-temperature in March marginally rises from a subzero cold 29.3°F (-1.5°C) in February to a cold 37.9°F (3.3°C). Weather in March »

Weather in April

April in Alton Bay, New Hampshire, is a cool spring month, with temperature in the range of an average low of 33.6°F (0.9°C) and an average high of 50.9°F (10.5°C). In Alton Bay, the average high-temperature in April rises from a cold 37.9°F (3.3°C) in March to a cool 50.9°F (10.5°C). Weather in April »

Weather in May

The last month of the spring, May, is a comfortable month in Alton Bay, New Hampshire, with an average temperature ranging between min 43.7°F (6.5°C) and max 63.9°F (17.7°C). In May, the average high-temperature rises from a fresh 50.9°F (10.5°C) in April to a comfortable 63.9°F (17.7°C). Weather in May »

Weather in June

June, the first month of the summer in Alton Bay, is a pleasant month, with an average temperature fluctuating between 71.6°F (22°C) and 51.3°F (10.7°C). In Alton Bay, New Hampshire, the average high-temperature in June slightly increases from a comfortable 63.9°F (17.7°C) in May to an agreeable 71.6°F (22°C). Weather in June »

Weather in July

July is a moderately hot summer month in Alton Bay, New Hampshire, with an average temperature fluctuating between 78.3°F (25.7°C) and 57.6°F (14.2°C). The warmest month is July, with an average high-temperature of 78.3°F (25.7°C) and an average low-temperature of 57.6°F (14.2°C). Weather in July »

Weather in August

August, the last month of the summer in Alton Bay, is another warm month, with an average temperature varying between 77.2°F (25.1°C) and 56.3°F (13.5°C). In Alton Bay, the average high-temperature in August is relatively the same as in July - a still warm 77.2°F (25.1°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a pleasant month in Alton Bay, New Hampshire, with an average temperature fluctuating between 49.6°F (9.8°C) and 69.6°F (20.9°C). In Alton Bay, the average high-temperature in September slightly decreases from a moderately hot 77.2°F (25.1°C) in August to a pleasant 69.6°F (20.9°C). Weather in September »

Weather in October

October, the same as September, in Alton Bay, New Hampshire, is another mild autumn month, with an average temperature ranging between min 40.8°F (4.9°C) and max 55.9°F (13.3°C). In Alton Bay, the average high-temperature in October drops from a pleasant 69.6°F (20.9°C) in September to a moderate 55.9°F (13.3°C). Weather in October »

Weather in November

November, the last month of the autumn in Alton Bay, is another chilly month, with an average temperature fluctuating between 43.3°F (6.3°C) and 30°F (-1.1°C). In November, the average high-temperature decreases from a mild 55.9°F (13.3°C) in October to a frosty 43.3°F (6.3°C). Weather in November »

Weather in December

December, the first month of the winter in Alton Bay, is also a subzero cold month, with an average temperature varying between 31.8°F (-0.1°C) and 21.6°F (-5.8°C). In December, the average high-temperature drops from a frosty 43.3°F (6.3°C) in November to a subzero cold 31.8°F (-0.1°C). Weather in December »
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FAQ

What is the coldest month in Alton Bay?

January is the coldest month in Alton Bay, with an average high-temperature of 26.1°F (-3.3°C) and an average low-temperature of 12.9°F (-10.6°C).

What is the most humid month in Alton Bay?

January and February, with an average relative humidity of 86%, are most humid months.

How many days does it rain in Alton Bay?

Throughout the year, there are 152 rainfall days, and 29.09" (739mm) of precipitation is accumulated.

When does it snow in Alton Bay?

Months with snowfall are January through May, October through December.

How many days does it snow in Alton Bay?

In Alton Bay, during the entire year, snow falls for 58.3 days and aggregates up to 38.98" (990mm) of snow.

What is the month with the lowest UV index in Alton Bay?

January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Alton Bay, New Hampshire.

What is the snowiest month in Alton Bay?

The month with the most snowfall is February, when snow falls for 12.4 days and typically aggregates up to 9.84" (250mm) of snow.

What is the month with the least sunshine in Alton Bay?

The month with the least sunshine is February, with an average of 4.5h of sunshine.

When is Daylight Saving Time (DST) in Alton Bay?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts in Alton Bay, New Hampshire, 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 Alton Bay?

April is the least humid month in Alton Bay, New Hampshire, with an average relative humidity of 76%.

When it does not snow in Alton Bay?

June through September are months without snowfall in Alton Bay.

When are the longest days in Alton Bay?

June has the longest days of the year in Alton Bay, with an average of 15h and 22min of daylight.

What are the months with the highest UV index in Alton Bay?

The months with the highest UV index in Alton Bay are June through August, with an average maximum UV index of 5.

What is the warmest month in Alton Bay?

With an average high-temperature of 78.3°F (25.7°C) and an average low-temperature of 57.6°F (14.2°C), July is the warmest month in Alton Bay.

What month has the most sunshine in Alton Bay?

With an average of 10.2h of sunshine, August has the most sunshine of the year.

What is the driest month in Alton Bay?

The month with the least rainfall in Alton Bay, New Hampshire, is September, when the rain falls for 10.8 days and typically collects 1.61" (41mm) of precipitation.

What is the rainiest month in Alton Bay?

The month with the most rainfall in Alton Bay is October, when the rain falls for 14.4 days and typically aggregates up to 3.19" (81mm) of precipitation.

What is the month with the shortest days in Alton Bay?

With an average of 9h and 1min of daylight, December has the shortest days of the year.

Average temperature
Alton Bay, NH

Average temperature - Alton Bay, NH

The warmest month (with the highest average high temperature) is July (78.3°F).
The month with the lowest average high temperature is January (26.1°F).

The month with the highest average low temperature is July (57.6°F).
The coldest month (with the lowest average low temperature) is January (12.9°F).

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Average pressure
Alton Bay, NH

Average pressure - Alton Bay, NH

The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed
Alton Bay, NH

Average wind speed - Alton Bay, NH

The windiest months (with the highest average wind speed) are January and February (7.1mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).

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Average humidity
Alton Bay, NH

Average humidity - Alton Bay, NH

The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is April (76%).

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Average rainfall
Alton Bay, NH

Average rainfall - Alton Bay, NH

The wettest month (with the highest rainfall) is October (3.19").
The driest month (with the least rainfall) is September (1.61").

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Average rainfall days
Alton Bay, NH

Average rainfall days - Alton Bay, NH

The month with the highest number of rainy days is April (15.8 days).
The month with the least rainy days is February (8.3 days).

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Average snowfall
Alton Bay, NH

Average snowfall - Alton Bay, NH

The month with the highest snowfall is February (9.84").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Alton Bay, NH

Average snowfall days - Alton Bay, NH

The month with the highest number of snowfall days is January (13.2 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Alton Bay, NH

Average daylight / Average sunshine - Alton Bay, NH

The month with the longest days is June (Average daylight: 15h and 22min).
The month with the shortest days is December (Average daylight: 9h and 1min).

The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

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Average sunshine days
Alton Bay, NH

Average sunshine days - Alton Bay, NH

The month with the most sunshine days is September (16.9 days).
The month with the least sunshine days is April (11.4 days).

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Average UV index
Alton Bay, NH

Average UV index - Alton Bay, NH

The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).

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Average visibility
Alton Bay, NH

Average visibility - Alton Bay, NH

The months with the highest visibility are January, March, April, May, June, July, August, October, November and December (5mi).
The months with the lowest visibility are February and September (4mi).

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