Alton Bay
New Hampshire, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Alton Bay, NH

January, like December, is another subzero cold winter month in Alton Bay, New Hampshire, with average temperature ranging between max 26.1°F (-3.3°C) and min 12.9°F (-10.6°C). January is the coldest month, 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 »

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

March, the first month of the spring, in Alton Bay, is a wintry month, with average temperature fluctuating between 37.9°F (3.3°C) and 22.5°F (-5.3°C). In March, the average high-temperature slightly increases, from a freezing cold 29.3°F (-1.5°C) in February, to a wintry 37.9°F (3.3°C). Weather in March »

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

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

June, the first month of the summer, in Alton Bay, is an agreeable month, with average temperature ranging between min 51.3°F (10.7°C) and max 71.6°F (22°C). In June, the average high-temperature marginally rises, from an enjoyable 63.9°F (17.7°C) in May, to a pleasant 71.6°F (22°C). Weather in June »

July in Alton Bay, New Hampshire, is a moderately hot summer month, with average temperature ranging between max 78.3°F (25.7°C) and min 57.6°F (14.2°C). 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. Weather in July »

The last month of the summer, August, is another warm month in Alton Bay, New Hampshire, with temperature in the range of an average low of 56.3°F (13.5°C) and an average high of 77.2°F (25.1°C). In Alton Bay, the average high-temperature in August is essentially the same as in July - a still moderately hot 77.2°F (25.1°C). Weather in August »

September, the first month of the autumn, in Alton Bay, is still a pleasant month, with average temperature ranging between min 49.6°F (9.8°C) and max 69.6°F (20.9°C). In September, the average high-temperature marginally drops, from a moderately hot 77.2°F (25.1°C) in August, to an agreeable 69.6°F (20.9°C). Weather in September »

October, like September, is a moderate autumn month in Alton Bay, New Hampshire, with average temperature varying between 40.8°F (4.9°C) and 55.9°F (13.3°C). In Alton Bay, the average high-temperature decreases, from an agreeable 69.6°F (20.9°C) in September, to a mild 55.9°F (13.3°C). Weather in October »

November, the last month of the autumn, in Alton Bay, is also a frosty month, with temperature in the range of an average low of 30°F (-1.1°C) and an average high of 43.3°F (6.3°C). In November, the average high-temperature drops, from a moderate 55.9°F (13.3°C) in October, to a frosty 43.3°F (6.3°C). Weather in November »

The first month of the winter, December, is also a subzero 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). In Alton Bay, the average high-temperature in December drops, from a chilly 43.3°F (6.3°C) in November, to a subzero cold 31.8°F (-0.1°C). Weather in December »

What is the coldest month in Alton Bay?

January is the coldest month, 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 are the most humid months in Alton Bay?

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

How much does it rain in Alton Bay?

In Alton Bay, New Hampshire, during the entire year, the rain falls for 152 days and collects up to 29.09" (739mm) of precipitation.

When does it snow in Alton Bay?

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

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 in Alton Bay, New Hampshire, 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?

February has the least sunshine of the year, with an average of 4.5h of sunshine.

What is the least humid month in Alton Bay?

April is the least humid month, with an average relative humidity of 76%.

When it does not snow in Alton Bay?

June through September are months without snowfall.

When are the longest days in Alton Bay?

With an average of 15.4h of daylight, June has the longest days of the year in Alton Bay, New Hampshire.

What is the month 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 in Alton Bay, New Hampshire.

What is the warmest month in Alton Bay?

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

What month has the most sunshine in Alton Bay?

August has the most sunshine of the year in Alton Bay, with an average of 10.2h of sunshine.

What is the driest month in Alton Bay?

The month with the least rainfall 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?

October is the month with the most rainfall in Alton Bay. Rain falls for 14.4 days and accumulates 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, New Hampshire, is December, with an average of 9h of daylight.
Average temperature - Alton Bay, NH
Average humidity - 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").

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).

Average snowfall - Alton Bay, NH
Average snowfall days - Alton Bay, NH

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

Average daylight / Average sunshine - Alton Bay, NH

The month with the longest days is June (Average daylight: 15.4h).
The month with the shortest days is December (Average daylight: 9h).

The month with the most sunshine is August (Average sunshine: 10.2h).
The month with the least sunshine is February (Average sunshine: 4.5h).

Average UV index - Alton Bay, NH

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