April weather forecastRiverside, WA
April
Weather in April
April in Riverside, Washington, is a cool spring month, with temperature in the range of an average low of 33.8°F (1°C) and an average high of 54.3°F (12.4°C).Temperature
The rise of average high-temperatures is seen in April, with an increase from a frosty 43°F (6.1°C) in March to a cool 54.3°F (12.4°C). The mean low-temperature during April nights in Riverside is an icy 33.8°F (1°C).Humidity
The average relative humidity in April is 64%.Rainfall
In April, in Riverside, Washington, the rain falls for 9.3 days. Throughout April, 0.51" (13mm) of precipitation is accumulated. In Riverside, Washington, during the entire year, the rain falls for 90.2 days and collects up to 7.56" (192mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. April is the last month it regularly snows. During 0.4 snowfall days, in April, Riverside aggregates 0.2" (5mm) of snow. In Riverside, Washington, during the entire year, snow falls for 25.5 days and aggregates up to 10.12" (257mm) of snow.Daylight
In Riverside, the average length of the day in April is 13h and 44min.On the first day of April in Riverside, sunrise is at 6:33 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 5:38 am and sunset at 8:11 pm PDT.
Sunshine
The average sunshine in April in Riverside is 10.6h.UV index
In April, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily maximum UV index of 3 in April interprets into the following advice:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. 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. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Riverside, WA
- Average high temperature in April: 54.3°F
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is December (30.4°F).
- Average low temperature in April: 33.8°F
The month with the highest average low temperature is August (55°F).
The coldest month (with the lowest average low temperature) is December (18.1°F).
Average pressure in April
Riverside, WA
- Average pressure in April: 29.99"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The months with the lowest atmospheric pressure are June and August (29.93"Hg).
Average wind speed in April
Riverside, WA
- Average wind speed in April: 5.1mph
The windiest month (with the highest average wind speed) is April (5.1mph).
The calmest month (with the lowest average wind speed) is January (4mph).
Average humidity in April
Riverside, WA
- Average humidity in April: 64%
The month with the highest relative humidity is January (91%).
The months with the lowest relative humidity are July and August (42%).
Average rainfall in April
Riverside, WA
- Average rainfall in April: 0.51"
The wettest month (with the highest rainfall) is December (0.94").
The driest months (with the least rainfall) are July and August (0.2").
Average rainfall days in April
Riverside, WA
- Average rainfall days in April: 9.3 days
The month with the highest number of rainy days is March (11.5 days).
The month with the least rainy days is August (2.8 days).
Average snowfall in April
Riverside, WA
- Average snowfall in April: 0.2"
The month with the highest snowfall is January (3.39").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in April
Riverside, WA
- Average snowfall days in April: 0.4 days
The month with the highest number of snowfall days is December (8.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in April /
Average sunshine in April
Riverside, WA
- Average daylight in April: 13h and 42min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in April: 10h and 36min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in April
Riverside, WA
- Average sunshine days in April: 17.7 days
The month with the most sunshine days is August (26.3 days).
The month with the least sunshine days is November (15.4 days).
Average UV index in April
Riverside, WA
- Average UV index in April: 3
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in April
Riverside, WA
- Average cloud cover in April: 30
The month with the most cloud cover is January (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility in April
Riverside, WA
- Average visibility in April: 6mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
