Monthly weather forecast and climate
Island Mountain, CA

Weather in January

January, the same as December, is a cool winter month in Island Mountain, California, with average temperature varying between 44.8°F (7.1°C) and 54.3°F (12.4°C). In January, the average high-temperature is almost the same as in December - a still fresh 54.3°F (12.4°C). Weather in January »

Weather in February

February, the last month of the winter, in Island Mountain, is another cool month, with average temperature ranging between min 43.5°F (6.4°C) and max 54.1°F (12.3°C). In Island Mountain, California, the average high-temperature in February is relatively the same as in January - a still cool 54.1°F (12.3°C). Weather in February »

Weather in March

March, the first month of the spring, in Island Mountain, is still a cool month, with average temperature ranging between max 54.9°F (12.7°C) and min 44.2°F (6.8°C). In Island Mountain, the average high-temperature is practically the same as in February - a still cool 54.9°F (12.7°C). Weather in March »

Weather in April

April is a moderate spring month in Island Mountain, California, with temperature in the range of an average high of 57.2°F (14°C) and an average low of 45.7°F (7.6°C). In Island Mountain, the average high-temperature is relatively the same as in March - a moderate 57.2°F (14°C). Weather in April »

Weather in May

May, the last month of the spring, in Island Mountain, is a comfortable month, with average temperature fluctuating between 61°F (16.1°C) and 48.4°F (9.1°C). In Island Mountain, the average high-temperature is relatively the same as in April - an enjoyable 61°F (16.1°C). Weather in May »

Weather in June

June, the first month of the summer, in Island Mountain, is also an enjoyable month, with average temperature fluctuating between 51.8°F (11°C) and 66.6°F (19.2°C). In June, the average high-temperature marginally rises, from 61°F (16.1°C) in May, to a still enjoyable 66.6°F (19.2°C). Weather in June »

Weather in July

July is an agreeable summer month in Island Mountain, California, with average temperature varying between 69.4°F (20.8°C) and 54.3°F (12.4°C). In July, the average high-temperature is almost the same as in June - a pleasant 69.4°F (20.8°C). Weather in July »

Weather in August

The last month of the summer, August, is also an agreeable month in Island Mountain, California, with average temperature varying between 69.4°F (20.8°C) and 54.3°F (12.4°C). In August, the average high-temperature remains equal as in July - a still pleasant 69.4°F (20.8°C). Weather in August »

Weather in September

The first month of the autumn, September, is also an agreeable month in Island Mountain, California, with average temperature ranging between min 54.3°F (12.4°C) and max 69.8°F (21°C). With an average high-temperature of 69.8°F (21°C) and an average low-temperature of 54.3°F (12.4°C), September is the warmest month. Weather in September »

Weather in October

October, like September, in Island Mountain, California, is another comfortable autumn month, with average temperature ranging between max 63.9°F (17.7°C) and min 51.3°F (10.7°C). In Island Mountain, the average high-temperature marginally drops, from a pleasant 69.8°F (21°C) in September, to a comfortable 63.9°F (17.7°C). Weather in October »

Weather in November

November, the last month of the autumn, in Island Mountain, is another mild month, with average temperature fluctuating between 57.6°F (14.2°C) and 47.1°F (8.4°C). In November, the average high-temperature slightly decreases, from an enjoyable 63.9°F (17.7°C) in October, to a moderate 57.6°F (14.2°C). Weather in November »

Weather in December

The first month of the winter, December, is also a fresh month in Island Mountain, California, with average temperature varying between 43.9°F (6.6°C) and 53.4°F (11.9°C). The coldest month is December, with an average high-temperature of 53.4°F (11.9°C) and an average low-temperature of 43.9°F (6.6°C). Weather in December »
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FAQ

How much does it rain in Island Mountain?

In Island Mountain, California, during the entire year, the rain falls for 102.7 days and collects up to 28.78" (731mm) of precipitation.

How many days does it snow in Island Mountain?

In Island Mountain, California, during the entire year, snow falls for 0.1 days.

When it does not snow in Island Mountain?

January, March through December are months without snowfall in Island Mountain.

What are the months with the lowest UV index in Island Mountain?

Months with the lowest UV index in Island Mountain are January through March, November and December, with an average maximum UV index of 3.

When does it snow in Island Mountain?

February is the only month when snow falls in Island Mountain.

What is the snowiest month in Island Mountain?

February has the most snowfall days of the year in Island Mountain. Snow falls for 0.1 days.

What is the most humid month in Island Mountain?

March is the most humid month in Island Mountain, with an average relative humidity of 81%.

When are the longest days in Island Mountain?

The month with the longest days in Island Mountain, California, is June, with an average of 15h of daylight.

What are the months with the highest UV index in Island Mountain?

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

What is the driest month in Island Mountain?

The month with the least rainfall in Island Mountain is July when the rain falls for 2.4 days and typically collects 0.08" (2mm) of precipitation.

What are the months with the most sunshine in Island Mountain?

Months with the most sunshine are July and August, with an average of 11.7h of sunshine.

What is the warmest month in Island Mountain?

The warmest month in Island Mountain, California, is September, with an average high-temperature of 69.8°F (21°C) and an average low-temperature of 54.3°F (12.4°C).

What is the least humid month in Island Mountain?

September is the least humid month in Island Mountain, California, with an average relative humidity of 72%.

What is the coldest month in Island Mountain?

The coldest month is December, with an average high-temperature of 53.4°F (11.9°C) and an average low-temperature of 43.9°F (6.6°C).

What is the rainiest month in Island Mountain?

December is the month with the most rainfall. Rain falls for 14.8 days and accumulates 5.31" (135mm) of precipitation.

What is the month with the shortest days in Island Mountain?

December has the shortest days of the year in Island Mountain, California, with an average of 9.4h of daylight.

What is the month with the least sunshine in Island Mountain?

With an average of 5h of sunshine, December has the least sunshine of the year.

Average temperature
Island Mountain, CA

Average temperature - Island Mountain, CA

The warmest month (with the highest average high temperature) is September (69.8°F).
The month with the lowest average high temperature is December (53.4°F).

Months with the highest average low temperature are July, August and September (54.3°F).
The coldest month (with the lowest average low temperature) is February (43.5°F).

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Average pressure
Island Mountain, CA

Average pressure - Island Mountain, CA

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are August and September (29.95").

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Average wind speed
Island Mountain, CA

Average wind speed - Island Mountain, CA

The windiest month (with the highest average wind speed) is June (10.6mph).
The calmest months (with the lowest average wind speed) are January and August (7.8mph).

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Average humidity
Island Mountain, CA

Average humidity - Island Mountain, CA

The month with the highest relative humidity is March (81%).
The month with the lowest relative humidity is September (72%).

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Average rainfall
Island Mountain, CA

Average rainfall - Island Mountain, CA

The wettest month (with the highest rainfall) is December (5.31").
The driest month (with the least rainfall) is July (0.08").

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Average rainfall days
Island Mountain, CA

Average rainfall days - Island Mountain, CA

The month with the highest number of rainy days is March (16.4 days).
The month with the least rainy days is August (1.8 days).

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Average snowfall days
Island Mountain, CA

Average snowfall days - Island Mountain, CA

The month with the highest number of snowfall days is February (0.1 days).
Months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

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Average daylight / Average sunshine
Island Mountain, CA

Average daylight / Average sunshine - Island Mountain, CA

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

Months with the most sunshine are July and August (Average sunshine: 11.7h).
The month with the least sunshine is December (Average sunshine: 5h).

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Average sunshine days
Island Mountain, CA

Average sunshine days - Island Mountain, CA

The month with the most sunshine days is July (28.4 days).
The month with the least sunshine days is March (13.1 days).

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Average UV index
Island Mountain, CA

Average UV index - Island Mountain, CA

Months with the highest UV index are June, July and August (UV index 5).
Months with the lowest UV index are January, February, March, November and December (UV index 3).

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Average visibility
Island Mountain, CA

Average visibility - Island Mountain, CA

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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