Climate and monthly weather forecast
Alton Bay, NH

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Weather in January

January, like December, is another subzero cold winter month in Alton Bay, New Hampshire, with an average temperature fluctuating between 12.9°F (-10.6°C) and 26.1°F (-3.3°C). January, characterized by an average high temperature of 26.1°F (-3.3°C) and a low temperature of 12.9°F (-10.6°C), is generally the coldest month. Weather in January »

Weather in February

The last month of the winter, February, is another freezing cold month in Alton Bay, New Hampshire, with an average temperature fluctuating between 14.4°F (-9.8°C) and 29.3°F (-1.5°C). The shift into February uncovers an average high-temperature of a still freezing cold 29.3°F (-1.5°C), subtly different from the previous month. 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 varying between 22.5°F (-5.3°C) and 37.9°F (3.3°C). March brings a slight increase in the average high-temperature, progressing from a subzero cold 29.3°F (-1.5°C) in February to a wintry 37.9°F (3.3°C). Weather in March »

Weather in April

April is a fresh spring month in Alton Bay, New Hampshire, with an average temperature fluctuating between 50.9°F (10.5°C) and 33.6°F (0.9°C). The transition to April introduces an increase in the average high-temperature, shifting from a cold 37.9°F (3.3°C) in March to a fresh 50.9°F (10.5°C). Weather in April »

Weather in May

The last month of the spring, May, is a refreshing 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). With the onset of May, Alton Bay's weather sees a temperature rise, transitioning from a cool 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 an agreeable month, with an average temperature ranging between max 71.6°F (22°C) and min 51.3°F (10.7°C). Observing a minor shift, the average high-temperature during June adjusts from May's comfortable 63.9°F (17.7°C) to a pleasant 71.6°F (22°C). Weather in June »

Weather in July

July in Alton Bay, New Hampshire, is a warm summer month, with an average temperature ranging between min 57.6°F (14.2°C) and max 78.3°F (25.7°C). Alton Bay's warmest temperatures are experienced in July, with average high temperatures of 78.3°F (25.7°C) and lows of 57.6°F (14.2°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Alton Bay, New Hampshire, with an average temperature fluctuating between 56.3°F (13.5°C) and 77.2°F (25.1°C). Alton Bay marks the onset of August with an average high-temperature of a still warm 77.2°F (25.1°C), a subtle shift from July's 78.3°F (25.7°C). Weather in August »

Weather in September

September, the first month of the autumn in Alton Bay, is still a pleasant month, with an average temperature fluctuating between 49.6°F (9.8°C) and 69.6°F (20.9°C). September's onset corresponds with a subtle shift in the average high-temperature, slightly moving from a moderately hot 77.2°F (25.1°C) in August to an agreeable 69.6°F (20.9°C). Weather in September »

Weather in October

October, like September, is a moderate autumn month in Alton Bay, New Hampshire, with an average temperature varying between 55.9°F (13.3°C) and 40.8°F (4.9°C). As October commences, the average high-temperature shows a reduction, transitioning from a pleasant 69.6°F (20.9°C) in September to a refreshing 55.9°F (13.3°C). Weather in October »

Weather in November

The last month of the autumn, November, is another chilly month in Alton Bay, New Hampshire, with an average temperature ranging between min 30°F (-1.1°C) and max 43.3°F (6.3°C). The arrival of November signals a shift in temperature, down from a mild 55.9°F (13.3°C) in October to a chilly 43.3°F (6.3°C). Weather in November »

Weather in December

The first month of the winter, December, is still a freezing cold month in Alton Bay, New Hampshire, with temperature in the range of an average low of 21.6°F (-5.8°C) and an average high of 31.8°F (-0.1°C). Start of December brings a shift in the average high-temperature, falling from November's frosty 43.3°F (6.3°C) to a freezing cold 31.8°F (-0.1°C). Weather in December »
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Frequently asked questions

What is the coldest month in Alton Bay?

January stands out as Alton Bay's coldest month, with temperatures ranging between an average high of 26.1°F (-3.3°C) and a low of 12.9°F (-10.6°C).

What is the most humid month in Alton Bay?

The months with the highest humidity are January and February, with an average relative humidity of 86%.

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?

January through May, October through December are months with snowfall in Alton Bay.

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 are the months with the lowest UV index in Alton Bay?

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

When does it snow the most in Alton Bay?

The month with the most snowfall in Alton Bay 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?

With an average of 4.5h of sunshine, February has the least sunshine of the year in Alton Bay, New Hampshire.

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

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.

What is the least humid month in Alton Bay?

The least humid month in Alton Bay, New Hampshire, is April, 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?

With an average of 15h and 24min of daylight, June has the longest days of the year in Alton Bay, New Hampshire.

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

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

What time of the year is the hottest in Alton Bay?

July, with an average high of 78.3°F (25.7°C) and a low of 57.6°F (14.2°C), signifies the warmest month of the year.

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 is September, when the rain falls for 10.8 days and typically collects 1.61" (41mm) of precipitation.

What is the wettest month in Alton Bay?

The month with the most rainfall in Alton Bay, New Hampshire, 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?

The month with the shortest days in Alton Bay is December, with an average of 9h and 0min of daylight.

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 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

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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Alton Bay, New Hampshire, USA

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