April weather forecastSumner, WA
April
Weather in April
April is a fresh spring month in Sumner, Washington, with an average temperature fluctuating between 54°F (12.2°C) and 37.2°F (2.9°C).Temperature
The shift from March to April introduces a subtle increase in the average high-temperature, moving from a frosty 48.6°F (9.2°C) to a cool 54°F (12.2°C). An average low-temperature of 37.2°F (2.9°C) marks the month of April.Humidity
The average relative humidity in April in Sumner is 81%.Rainfall
In Sumner, during April, the rain falls for 18.5 days and regularly aggregates up to 2.83" (72mm) of precipitation. Throughout the year, in Sumner, there are 185 rainfall days, and 35.71" (907mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. April is the last month it regularly snows in Sumner. During 0.8 snowfall days, in April, Sumner aggregates 0.2" (5mm) of snow. In Sumner, during the entire year, snow falls for 15.8 days and aggregates up to 9.09" (231mm) of snow.Daylight
In Sumner, the average length of the day in April is 13h and 39min.On the first day of April, sunrise is at 6:45 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 5:52 am and sunset at 8:19 pm PDT.
Sunshine
The average sunshine in April is 7.8h.UV index
The average daily maximum UV index in April is 3. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: A typical high UV index of 3 in April suggests the following recommendations:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Sumner, WA
- Average high temperature in April: 54°F
The warmest month (with the highest average high temperature) is August (75.7°F).
The month with the lowest average high temperature is December (41.4°F).
- Average low temperature in April: 37.2°F
The month with the highest average low temperature is August (50.9°F).
The coldest month (with the lowest average low temperature) is December (32°F).
Average pressure in April
Sumner, WA
- Average pressure in April: 30.05"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in April
Sumner, WA
- Average wind speed in April: 4.3mph
The windiest month (with the highest average wind speed) is January (4.9mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity in April
Sumner, WA
- Average humidity in April: 81%
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are July and August (70%).
Average rainfall in April
Sumner, WA
- Average rainfall in April: 2.83"
The wettest month (with the highest rainfall) is December (5.35").
The driest month (with the least rainfall) is July (0.51").
Average rainfall days in April
Sumner, WA
- Average rainfall days in April: 18.5 days
The month with the highest number of rainy days is March (20.7 days).
The month with the least rainy days is August (6.8 days).
Average snowfall in April
Sumner, WA
- Average snowfall in April: 0.2"
The month with the highest snowfall is February (3.31").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in April
Sumner, WA
- Average snowfall days in April: 0.8 days
The month with the highest number of snowfall days is February (5.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in April /
Average sunshine in April
Sumner, 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 36min).
- Average sunshine in April: 7h and 48min
The month with the most sunshine is August (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).
Average sunshine days in April
Sumner, WA
- Average sunshine days in April: 9.2 days
The month with the most sunshine days is August (22 days).
The month with the least sunshine days is February (8.2 days).
Average UV index in April
Sumner, WA
- Average UV index in April: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in April
Sumner, WA
- Average cloud cover in April: 52
The months with the most cloud cover are January and December (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in April
Sumner, WA
- Average visibility in April: 5mi
The months with the highest visibility are July and August (6mi).
The months with the lowest visibility are January, February and December (4mi).
