April weather forecastThornton, WA
April
Weather in April
April in Thornton, Washington, is a cool spring month, with temperature in the range of an average low of 37°F (2.8°C) and an average high of 55°F (12.8°C).Temperature
As Thornton, Washington, welcomes April, the average high-temperature sees a modest rise, transitioning from a chilly 46.9°F (8.3°C) in March to a fresh 55°F (12.8°C). Thornton, in April, observes a steady average low-temperature of 37°F (2.8°C).Humidity
In April, the average relative humidity is 69%.Rainfall
In Thornton, during April, the rain falls for 14.6 days and regularly aggregates up to 1.42" (36mm) of precipitation. In Thornton, during the entire year, the rain falls for 120.2 days and collects up to 14.69" (373mm) of precipitation.Snowfall
January through May, September through December are months with snowfall in Thornton. In Thornton, during April, snow falls for 2.2 days and regularly aggregates up to 0.75" (19mm) of snow. Throughout the year, in Thornton, there are 39.6 snowfall days, and 22.68" (576mm) of snow is accumulated.Daylight
In Thornton, the average length of the day in April is 13h and 39min.On the first day of April, sunrise is at 6:26 am and sunset at 7:19 pm. On the last day of the month, sunrise is at 5:33 am and sunset at 7:59 pm PDT.
Sunshine
In Thornton, Washington, the average sunshine in April is 9.4h.UV index
The average daily maximum UV index in April is 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: In April, the average maximum UV index of 3 translates into the following recommendations:
Take necessary precautions - Protection from skin and eye injury is mandatory. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. 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
Thornton, WA
- Average high temperature in April: 55°F
The warmest month (with the highest average high temperature) is August (83.5°F).
The month with the lowest average high temperature is December (34.7°F).
- Average low temperature in April: 37°F
The month with the highest average low temperature is August (60.4°F).
The coldest month (with the lowest average low temperature) is December (24.6°F).
Average pressure in April
Thornton, WA
- Average pressure in April: 29.99"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in April
Thornton, WA
- Average wind speed in April: 7.9mph
The windiest month (with the highest average wind speed) is March (8mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).
Average humidity in April
Thornton, WA
- Average humidity in April: 69%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (37%).
Average rainfall in April
Thornton, WA
- Average rainfall in April: 1.42"
The wettest month (with the highest rainfall) is December (1.93").
The driest month (with the least rainfall) is July (0.28").
Average rainfall days in April
Thornton, WA
- Average rainfall days in April: 14.6 days
The month with the highest number of rainy days is April (14.6 days).
The month with the least rainy days is July (4.5 days).
Average snowfall in April
Thornton, WA
- Average snowfall in April: 0.75"
The month with the highest snowfall is February (6.69").
The months with the least snowfall are June, July and August (0").
Average snowfall days in April
Thornton, WA
- Average snowfall days in April: 2.2 days
The months with the highest number of snowfall days are February and December (9.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in April /
Average sunshine in April
Thornton, WA
- Average daylight in April: 13h and 36min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in April: 9h and 24min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 4h and 36min).
Average sunshine days in April
Thornton, WA
- Average sunshine days in April: 12.9 days
The month with the most sunshine days is July (24.6 days).
The month with the least sunshine days is February (12.2 days).
Average UV index in April
Thornton, WA
- Average UV index in April: 3
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in April
Thornton, WA
- Average cloud cover in April: 40
The months with the most cloud cover are January and December (Cloud cover 53).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility in April
Thornton, 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, February and December (5mi).
