Monthly weather forecast and climate
Rio Dell, CA

Weather in January

January, like December, in Rio Dell, California, is another fresh winter month, with average temperature ranging between min 41.4°F (5.2°C) and max 54.3°F (12.4°C). In Rio Dell, the average high-temperature in January 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 Rio Dell, is another cool month, with average temperature ranging between min 39.7°F (4.3°C) and max 53.6°F (12°C). In Rio Dell, the average high-temperature is relatively the same as in January - a still fresh 53.6°F (12°C). Weather in February »

Weather in March

March, the first month of the spring, in Rio Dell, is also a fresh month, with average temperature fluctuating between 54.9°F (12.7°C) and 40.3°F (4.6°C). In March, the average high-temperature is relatively the same as in February - a still cool 54.9°F (12.7°C). Weather in March »

Weather in April

April is a mild spring month in Rio Dell, California, with average temperature fluctuating between 41.5°F (5.3°C) and 58.5°F (14.7°C). In Rio Dell, the average high-temperature is practically the same as in March - a mild 58.5°F (14.7°C). Weather in April »

Weather in May

The last month of the spring, May, is an enjoyable month in Rio Dell, California, with average temperature ranging between max 63°F (17.2°C) and min 44.1°F (6.7°C). In Rio Dell, the average high-temperature in May is practically the same as in April - an enjoyable 63°F (17.2°C). Weather in May »

Weather in June

June, the first month of the summer, in Rio Dell, is also an enjoyable month, with average temperature ranging between min 48.7°F (9.3°C) and max 67.8°F (19.9°C). In Rio Dell, the average high-temperature is relatively the same as in May - a still enjoyable 67.8°F (19.9°C). Weather in June »

Weather in July

July in Rio Dell, California, is an agreeable summer month, with temperature in the range of an average high of 73°F (22.8°C) and an average low of 51.4°F (10.8°C). In Rio Dell, the average high-temperature in July is practically the same as in June - an agreeable 73°F (22.8°C). Weather in July »

Weather in August

The last month of the summer, August, is a warm month in Rio Dell, California, with average temperature varying between 74.1°F (23.4°C) and 51.8°F (11°C). With an average high-temperature of 74.1°F (23.4°C) and an average low-temperature of 51.8°F (11°C), August is the warmest month. Weather in August »

Weather in September

The first month of the autumn, September, is also an agreeable month in Rio Dell, California, with average temperature fluctuating between 50.9°F (10.5°C) and 72.5°F (22.5°C). In Rio Dell, the average high-temperature is relatively the same as in August - an agreeable 72.5°F (22.5°C). Weather in September »

Weather in October

October, like September, in Rio Dell, California, is another enjoyable autumn month, with average temperature fluctuating between 47.8°F (8.8°C) and 66.2°F (19°C). In October, the average high-temperature marginally drops, from a pleasant 72.5°F (22.5°C) in September, to a comfortable 66.2°F (19°C). Weather in October »

Weather in November

November, the last month of the autumn, in Rio Dell, is also a moderate month, with average temperature ranging between min 43.5°F (6.4°C) and max 58.1°F (14.5°C). In Rio Dell, the average high-temperature marginally drops, from an enjoyable 66.2°F (19°C) in October, to a mild 58.1°F (14.5°C). Weather in November »

Weather in December

The first month of the winter, December, is also a fresh month in Rio Dell, California, with temperature in the range of an average high of 52.9°F (11.6°C) and an average low of 40.1°F (4.5°C). The coldest month is December, with an average high-temperature of 52.9°F (11.6°C) and an average low-temperature of 40.1°F (4.5°C). Weather in December »
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FAQ

How much does it rain in Rio Dell?

In Rio Dell, during the entire year, the rain falls for 110.9 days and collects up to 28.27" (718mm) of precipitation.

How much does it snow in Rio Dell?

In Rio Dell, during the entire year, snow aggregates up to 0.59" (15mm).

When it does not snow in Rio Dell?

In Rio Dell, California, snow does not fall in January, March through December.

What is the month with the lowest UV index in Rio Dell?

January through March, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Rio Dell.

When does it snow in Rio Dell?

The only month with snowfall is February.

What is the snowiest month in Rio Dell?

February is the month with the most snowfall in Rio Dell, California. Snow falls for 0.3 days and accumulates 0.59" (15mm) of snow.

What is the most humid month in Rio Dell?

March is the most humid month, with an average relative humidity of 83%.

When are the longest days in Rio Dell?

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

When is the highest UV index in Rio Dell?

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

What is the driest month in Rio Dell?

July is the month with the least rainfall in Rio Dell, California. Rain falls for 1.8 days and accumulates 0.08" (2mm) of precipitation.

What is the month with the most sunshine in Rio Dell?

July and August, with an average of 11.6h of sunshine, are months with the most sunshine in Rio Dell.

What is the warmest month in Rio Dell?

August is the warmest month in Rio Dell, with an average high-temperature of 74.1°F (23.4°C) and an average low-temperature of 51.8°F (11°C).

What is the least humid month in Rio Dell?

September is the least humid month in Rio Dell, with an average relative humidity of 73%.

What is the coldest month in Rio Dell?

December is the coldest month, with an average high-temperature of 52.9°F (11.6°C) and an average low-temperature of 40.1°F (4.5°C).

What is the wettest month in Rio Dell?

The month with the most rainfall is December when the rain falls for 14.8 days and typically aggregates up to 4.96" (126mm) of precipitation.

What is the month with the shortest days in Rio Dell?

With an average of 9.3h of daylight, December has the shortest days of the year in Rio Dell.

What is the month with the least sunshine in Rio Dell?

The month with the least sunshine is December, with an average of 5h of sunshine.

Average temperature
Rio Dell, CA

Average temperature - Rio Dell, CA

The warmest month (with the highest average high temperature) is August (74.1°F).
The month with the lowest average high temperature is December (52.9°F).

The month with the highest average low temperature is August (51.8°F).
The coldest month (with the lowest average low temperature) is February (39.7°F).

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Average pressure
Rio Dell, CA

Average pressure - Rio Dell, CA

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are August and September (29.96").

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Average wind speed
Rio Dell, CA

Average wind speed - Rio Dell, CA

The windiest month (with the highest average wind speed) is June (7.7mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).

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Average rainfall
Rio Dell, CA

Average rainfall - Rio Dell, CA

The wettest month (with the highest rainfall) is December (4.96").
The driest month (with the least rainfall) is July (0.08").

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Average rainfall days
Rio Dell, CA

Average rainfall days - Rio Dell, CA

The month with the highest number of rainy days is March (17.3 days).
Months with the least rainy days are July and August (1.8 days).

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Average snowfall
Rio Dell, CA

Average snowfall - Rio Dell, CA

The month with the highest snowfall is February (0.59").
Months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days
Rio Dell, CA

Average snowfall days - Rio Dell, CA

The month with the highest number of snowfall days is February (0.3 days).
Months with the least snowfall days are January, March, April, May, June, July, August, September, October and November (0 days).

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Average daylight / Average sunshine
Rio Dell, CA

Average daylight / Average sunshine - Rio Dell, CA

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.3h).

Months with the most sunshine are July and August (Average sunshine: 11.6h).
The month with the least sunshine is December (Average sunshine: 5h).

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Average sunshine days
Rio Dell, CA

Average sunshine days - Rio Dell, CA

The month with the most sunshine days is July (28.5 days).
The month with the least sunshine days is March (11.9 days).

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Average UV index
Rio Dell, CA

Average UV index - Rio Dell, 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
Rio Dell, CA

Average visibility - Rio Dell, CA

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

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