April weather forecast and climate
Riverdale, CA

Weather in April

April is a moderately hot spring month in Riverdale, California, with temperature in the range of an average high of 74.8°F (23.8°C) and an average low of 51.4°F (10.8°C).

Temperature

In Riverdale, the average high-temperature slightly increases, from an enjoyable 67.8°F (19.9°C) in March, to a moderately hot 74.8°F (23.8°C). In April, the average low-temperature is 51.4°F (10.8°C).

Humidity

The average relative humidity in Riverdale is 53%.

Rainfall

In Riverdale, California, during 7 rainfall days, 0.94" (24mm) of precipitation is typically accumulated. Throughout the year, there are 58.2 rainfall days, and 9.29" (236mm) of precipitation is accumulated.

Daylight

The average length of the day in April is 13.2h.

Sunshine

The average sunshine is 10.9h.

UV index

The average daily maximum UV index in April is 6. A UV Index estimate of 6 to 7 represents a high health risk from the exposure to the Sun's UV radiation for the ordinary person.
Note: In April, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in April in Riverdale?

The average high-temperature, in April, is 74.8°F (23.8°C), while the average low-temperature is 51.4°F (10.8°C).

What is the average humidity in April in Riverdale?

The average relative humidity in April in Riverdale is 53%.

How much does it rain in Riverdale in April?

In Riverdale, California, in April, it is raining for 7 days, with typically 0.94" (24mm) of accumulated precipitation.

How many hours of daylight does Riverdale have in April?

In Riverdale, California, the average length of the day in April is 13.2h.

How long on average sun shines in April in Riverdale?

In Riverdale, the average sunshine in April is 10.9h.

What is the UV index intensity in April in Riverdale?

The average daily maximum UV index in April in Riverdale, California, is 6. A UV Index reading of 6 to 7 represents a high health threat from unprotected exposure to the UV radiation.

Average temperature in April
Riverdale, CA

Average temperature in April - Riverdale, CA
  • Average high temperature in April: 74.8°F

The warmest month (with the highest average high temperature) is July (102.2°F).
The month with the lowest average high temperature is December (57.2°F).

  • Average low temperature in April: 51.4°F

The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is December (43°F).

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Average pressure in April
Riverdale, CA

Average pressure in April - Riverdale, CA
  • Average pressure in April: 30"

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.89").

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Average wind speed in April
Riverdale, CA

Average wind speed in April - Riverdale, CA
  • Average wind speed in April: 6.5mph

The windiest month (with the highest average wind speed) is June (7.1mph).
The calmest months (with the lowest average wind speed) are January and November (4.8mph).

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Average humidity in April
Riverdale, CA

Average humidity in April - Riverdale, CA
  • Average humidity in April: 53%

Months with the highest relative humidity are January and December (66%).
The month with the lowest relative humidity is July (30%).

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Average rainfall in April
Riverdale, CA

Average rainfall in April - Riverdale, CA
  • Average rainfall in April: 0.94"

The wettest months (with the highest rainfall) are January, February and March (1.54").
The driest month (with the least rainfall) is August (0.08").

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Average rainfall days in April
Riverdale, CA

Average rainfall days in April - Riverdale, CA
  • Average rainfall days in April: 7 days

The month with the highest number of rainy days is March (9.6 days).
The month with the least rainy days is August (0.8 days).

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Average daylight in April /
Average sunshine in April
Riverdale, CA

Average daylight in April / Average sunshine in April - Riverdale, CA
  • Average daylight in April: 13.2h

The month with the longest days is June (Average daylight: 14.6h).
The month with the shortest days is December (Average daylight: 9.7h).

  • Average sunshine in April: 10.9h

Months with the most sunshine are June and July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6.4h).

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Average sunshine days in April
Riverdale, CA

Average sunshine days in April - Riverdale, CA
  • Average sunshine days in April: 22.5 days

The month with the most sunshine days is August (29.3 days).
The month with the least sunshine days is February (19.4 days).

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Average UV index in April
Riverdale, CA

Average UV index in April - Riverdale, CA
  • Average UV index in April: 6

Months with the highest UV index are June, July and August (UV index 7).
Months with the lowest UV index are January, November and December (UV index 3).

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Average cloud cover in April
Riverdale, CA

Average cloud cover in April - Riverdale, CA
  • Average cloud cover in April: 21

Months with the most cloud cover are March and December (Cloud cover 28).
The month with the least cloud cover is August (Cloud cover 4).

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Average visibility in April
Riverdale, CA

Average visibility in April - Riverdale, CA
  • Average visibility in April: 6mi

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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