Monthly weather forecast and climate
O'Brien, CA

Weather in January

January is a fresh winter month in O'Brien, California, with temperature in the range of an average high of 50.4°F (10.2°C) and an average low of 35.2°F (1.8°C). In O'Brien, California, the average high-temperature is essentially the same as in December - a fresh 50.4°F (10.2°C). Weather in January »

Weather in February

The last month of the winter, February, is also a fresh month in O'Brien, California, with average temperature varying between 35.1°F (1.7°C) and 51.6°F (10.9°C). In February, the average high-temperature is essentially the same as in January - a still cool 51.6°F (10.9°C). Weather in February »

Weather in March

The first month of the spring, March, is also a fresh month in O'Brien, California, with average temperature ranging between max 54.1°F (12.3°C) and min 37°F (2.8°C). In March, the average high-temperature is essentially the same as in February - a still cool 54.1°F (12.3°C). Weather in March »

Weather in April

April in O'Brien, California, is a comfortable spring month, with average temperature fluctuating between 62.4°F (16.9°C) and 40.3°F (4.6°C). In O'Brien, the average high-temperature marginally rises, from a cool 54.1°F (12.3°C) in March, to a comfortable 62.4°F (16.9°C). Weather in April »

Weather in May

The last month of the spring, May, is an agreeable month in O'Brien, California, with average temperature ranging between max 71.2°F (21.8°C) and min 46°F (7.8°C). In O'Brien, the average high-temperature in May slightly increases, from a comfortable 62.4°F (16.9°C) in April, to an agreeable 71.2°F (21.8°C). Weather in May »

Weather in June

June, the first month of the summer, in O'Brien, is a moderately hot month, with average temperature ranging between max 82.4°F (28°C) and min 53.8°F (12.1°C). In June, the average high-temperature rises, from a pleasant 71.2°F (21.8°C) in May, to a moderately hot 82.4°F (28°C). Weather in June »

Weather in July

July is a hot summer month in O'Brien, California, with average temperature ranging between min 59.4°F (15.2°C) and max 91.6°F (33.1°C). July is the warmest month, with an average high-temperature of 91.6°F (33.1°C) and an average low-temperature of 59.4°F (15.2°C). Weather in July »

Weather in August

August, the last month of the summer, in O'Brien, is also a hot month, with average temperature fluctuating between 58.6°F (14.8°C) and 90.1°F (32.3°C). In O'Brien, the average high-temperature in August is practically the same as in July - a still hot 90.1°F (32.3°C). Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in O'Brien, California, with average temperature ranging between max 84°F (28.9°C) and min 54.3°F (12.4°C). In O'Brien, California, the average high-temperature in September marginally drops, from a tropical 90.1°F (32.3°C) in August, to a warm 84°F (28.9°C). Weather in September »

Weather in October

October, like September, is an agreeable autumn month in O'Brien, California, with average temperature ranging between min 46.8°F (8.2°C) and max 71.4°F (21.9°C). In O'Brien, California, the average high-temperature in October decreases, from a warm 84°F (28.9°C) in September, to a pleasant 71.4°F (21.9°C). Weather in October »

Weather in November

November, the last month of the autumn, in O'Brien, is another mild month, with average temperature varying between 56.5°F (13.6°C) and 38.5°F (3.6°C). In November, the average high-temperature declines considerably, from an agreeable 71.4°F (21.9°C) in October, to a mild 56.5°F (13.6°C). Weather in November »

Weather in December

The first month of the winter, December, is also a frosty month in O'Brien, California, with average temperature fluctuating between 33.6°F (0.9°C) and 47.8°F (8.8°C). The coldest month is December, with an average high-temperature of 47.8°F (8.8°C) and an average low-temperature of 33.6°F (0.9°C). Weather in December »
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FAQ

How much does it rain in O'Brien?

Throughout the year, in O'Brien, there are 102.3 rainfall days, and 24.21" (615mm) of precipitation is accumulated.

When does it snow in O'Brien?

Months with snowfall in O'Brien, California, are January through March, November and December.

How many days does it snow in O'Brien?

In O'Brien, during the entire year, snow falls for 4.6 days, and aggregates up to 4.45" (113mm) of snow.

What are the months with the lowest UV index in O'Brien?

Months with the lowest UV index are February, November and December, with an average maximum UV index of 2.

What is the most humid month in O'Brien?

March is the most humid month, with an average relative humidity of 77%.

What is the wettest month in O'Brien?

March is the month with the most rainfall. Rain falls for 16.8 days and accumulates 4.8" (122mm) of precipitation.

When it does not snow in O'Brien?

In O'Brien snow does not fall in April through October.

When are the longest days in O'Brien?

The month with the longest days in O'Brien is June, with an average of 15.1h of daylight.

What is the warmest month in O'Brien?

The warmest month is July, with an average high-temperature of 91.6°F (33.1°C) and an average low-temperature of 59.4°F (15.2°C).

What is the driest month in O'Brien?

July is the month with the least rainfall in O'Brien. Rain falls for 2.5 days and accumulates 0.12" (3mm) of precipitation.

What month has the most sunshine in O'Brien?

The month with the most sunshine is July, with an average of 12.2h of sunshine.

What is the month with the highest UV index in O'Brien?

With an average maximum UV index of 7, July is the month with the highest UV index in O'Brien, California.

What is the least humid month in O'Brien?

August is the least humid month, with an average relative humidity of 37%.

What is the snowiest month in O'Brien?

The month with the most snowfall is November when snow falls for 0.5 days and typically aggregates up to 1.3" (33mm) of snow.

What is the coldest month in O'Brien?

The coldest month is December, with an average high-temperature of 47.8°F (8.8°C) and an average low-temperature of 33.6°F (0.9°C).

What is the month with the shortest days in O'Brien?

December has the shortest days of the year in O'Brien, California, with an average of 9.3h of daylight.

What is the month with the least sunshine in O'Brien?

The month with the least sunshine in O'Brien is December, with an average of 5.3h of sunshine.

Average temperature
O'Brien, CA

Average temperature - O

The warmest month (with the highest average high temperature) is July (91.6°F).
The month with the lowest average high temperature is December (47.8°F).

The month with the highest average low temperature is July (59.4°F).
The coldest month (with the lowest average low temperature) is December (33.6°F).

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Average pressure
O'Brien, CA

Average pressure - O

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is August (29.92").

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Average wind speed
O'Brien, CA

Average wind speed - O

The windiest months (with the highest average wind speed) are March and October (5.3mph).
The calmest months (with the lowest average wind speed) are August and November (4.5mph).

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Average rainfall
O'Brien, CA

Average rainfall - O

The wettest month (with the highest rainfall) is March (4.8").
The driest month (with the least rainfall) is July (0.12").

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Average rainfall days
O'Brien, CA

Average rainfall days - O

The month with the highest number of rainy days is March (16.8 days).
The month with the least rainy days is August (1.7 days).

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Average snowfall
O'Brien, CA

Average snowfall - O

The month with the highest snowfall is November (1.3").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days
O'Brien, CA

Average snowfall days - O

The month with the highest number of snowfall days is February (1.9 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight / Average sunshine
O'Brien, CA

Average daylight / Average sunshine - O

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

The month with the most sunshine is July (Average sunshine: 12.2h).
The month with the least sunshine is December (Average sunshine: 5.3h).

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Average sunshine days
O'Brien, CA

Average sunshine days - O

The month with the most sunshine days is August (27.1 days).
The month with the least sunshine days is March (11.8 days).

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Average visibility
O'Brien, CA

Average visibility - O

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is December (5mi).

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