April weather forecastHeisson, WA
April
Weather in April
April is a mild spring month in Heisson, Washington, with temperature in the range of an average high of 56.1°F (13.4°C) and an average low of 38.1°F (3.4°C).Temperature
April sees a marginal temperature increase, moving from a fresh 50.4°F (10.2°C) in March to a mild 56.1°F (13.4°C). During April, Heisson records an average temperature of 38.1°F (3.4°C) at night.Humidity
The average relative humidity in April is 81%.Rainfall
In Heisson, during April, the rain falls for 19 days and regularly aggregates up to 3.58" (91mm) of precipitation. In Heisson, during the entire year, the rain falls for 177.9 days and collects up to 40.67" (1033mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in April is 13h and 35min.On the first day of the month, sunrise is at 6:48 am and sunset at 7:39 pm. On the last day of April, sunrise is at 5:57 am and sunset at 8:16 pm PDT.
Sunshine
The average sunshine in April is 7.1h.UV index
In April, the average daily maximum UV index in Heisson, Washington, is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: An average UV index of 3 in April transforms into this advice:
Preventative actions are necessary - Recommendations to ward off sunburn are given. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Heisson, WA
- Average high temperature in April: 56.1°F
The warmest month (with the highest average high temperature) is August (79.3°F).
The month with the lowest average high temperature is December (42.6°F).
- Average low temperature in April: 38.1°F
The month with the highest average low temperature is August (52°F).
The coldest month (with the lowest average low temperature) is December (32.7°F).
Average pressure in April
Heisson, WA
- Average pressure in April: 30.06"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in April
Heisson, WA
- Average wind speed in April: 4.7mph
The windiest month (with the highest average wind speed) is January (6.1mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).
Average humidity in April
Heisson, WA
- Average humidity in April: 81%
The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is August (67%).
Average rainfall in April
Heisson, WA
- Average rainfall in April: 3.58"
The wettest month (with the highest rainfall) is January (6.06").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in April
Heisson, WA
- Average rainfall days in April: 19 days
The month with the highest number of rainy days is March (20.3 days).
The month with the least rainy days is August (5.1 days).
Average snowfall in April
Heisson, WA
- Average snowfall in April: 0"
The month with the highest snowfall is February (2.76").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in April
Heisson, WA
- Average snowfall days in April: 0.2 days
The month with the highest number of snowfall days is February (3.7 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
Heisson, WA
- Average daylight in April: 13h and 36min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in April: 7h and 6min
The month with the most sunshine is August (Average sunshine: 10h and 48min).
The months with the least sunshine are January and February (Average sunshine: 3h and 48min).
Average sunshine days in April
Heisson, WA
- Average sunshine days in April: 9.5 days
The month with the most sunshine days is July (24.1 days).
The month with the least sunshine days is February (8.2 days).
Average UV index in April
Heisson, 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
Heisson, WA
- Average cloud cover in April: 57
The month with the most cloud cover is February (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in April
Heisson, WA
- Average visibility in April: 5mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
