April weather forecastRock Island, WA
April
Weather in April
April is a refreshing spring month in Rock Island, Washington, with temperature in the range of an average high of 55.4°F (13°C) and an average low of 35.6°F (2°C).Temperature
As Rock Island welcomes April, the average high-temperature sees a rise, transitioning from a chilly 45.3°F (7.4°C) in March to a moderate 55.4°F (13°C). Nighttime temperatures consistently average an icy 35.6°F (2°C) during April.Humidity
The average relative humidity in April in Rock Island is 63%.Rainfall
In Rock Island, Washington, in April, it is raining for 11.8 days, with typically 0.67" (17mm) of accumulated precipitation. Throughout the year, in Rock Island, Washington, there are 111.7 rainfall days, and 10.71" (272mm) of precipitation is accumulated.Snowfall
January through April, September, November and December are months with snowfall. April is the last month it regularly snows. During 0.4 snowfall days, in April, Rock Island aggregates 0.08" (2mm) of snow. Throughout the year, there are 31.6 snowfall days, and 18.86" (479mm) of snow is accumulated.Daylight
In April, the average length of the day is 13h and 40min.On the first day of April, sunrise is at 6:37 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 5:43 am and sunset at 8:11 pm PDT.
Sunshine
The average sunshine in April is 10.5h.UV index
In April, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: An average maximum UV index of 3 in April leads to these recommendations:
Undertake precautions - Guarding against sun damage is counselled. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Rock Island, WA
- Average high temperature in April: 55.4°F
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is December (32.4°F).
- Average low temperature in April: 35.6°F
The month with the highest average low temperature is August (56.3°F).
The coldest month (with the lowest average low temperature) is December (20.7°F).
Average pressure in April
Rock Island, WA
- Average pressure in April: 30"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is August (29.93"Hg).
Average wind speed in April
Rock Island, WA
- Average wind speed in April: 6.1mph
The windiest month (with the highest average wind speed) is June (6.5mph).
The calmest month (with the lowest average wind speed) is December (3.7mph).
Average humidity in April
Rock Island, WA
- Average humidity in April: 63%
The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are July and August (44%).
Average rainfall in April
Rock Island, WA
- Average rainfall in April: 0.67"
The wettest months (with the highest rainfall) are January and December (1.57").
The driest months (with the least rainfall) are July and August (0.24").
Average rainfall days in April
Rock Island, WA
- Average rainfall days in April: 11.8 days
The month with the highest number of rainy days is March (13.8 days).
The month with the least rainy days is August (3.8 days).
Average snowfall in April
Rock Island, WA
- Average snowfall in April: 0.08"
The month with the highest snowfall is December (5.98").
The months with the least snowfall are May, June, July, August and October (0").
Average snowfall days in April
Rock Island, WA
- Average snowfall days in April: 0.4 days
The month with the highest number of snowfall days is December (9.5 days).
The months with the least snowfall days are May, June, July, August and October (0 days).
Average daylight in April /
Average sunshine in April
Rock Island, WA
- Average daylight in April: 13h and 42min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in April: 10h and 30min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in April
Rock Island, WA
- Average sunshine days in April: 15.8 days
The month with the most sunshine days is July (25.5 days).
The month with the least sunshine days is February (12.6 days).
Average UV index in April
Rock Island, WA
- Average UV index in April: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in April
Rock Island, WA
- Average cloud cover in April: 31
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 11).
Average visibility in April
Rock Island, WA
- Average visibility in April: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (4mi).
