Contents
- Weather in April
- Frequently asked questions
- Average temperature in April
- Average pressure in April
- Average wind speed in April
- Average humidity in April
- Average rainfall in April
- Average rainfall days in April
- Average snowfall in April
- Average snowfall days in April
- Average daylight in April
- Average sunshine in April
- Average sunshine days in April
- Average UV index in April
- Average cloud cover in April
- Average visibility in April
Weather in April
Temperature
In April, the average high-temperature marginally rises from a frosty 45.1°F (7.3°C) in March to a cool 51.1°F (10.6°C). April nights cool down to an average low-temperature of 34.7°F (1.5°C).Humidity
In April, the average relative humidity in Index is 84%.Rainfall
In Index, in April, it is raining for 21.2 days, with typically 4.25" (108mm) of accumulated precipitation. Throughout the year, in Index, there are 200.6 rainfall days, and 51.65" (1312mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. April is the last month it regularly snows. During 0.8 snowfall days, in April, Index aggregates 0.35" (9mm) of snow. In Index, during the entire year, snow falls for 15.9 days and aggregates up to 14.41" (366mm) of snow.Daylight
The average length of the day in April in Index is 13h and 41min.On the first day of April, sunrise is at 6:42 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 5:48 am and sunset at 8:18 pm PDT.
Sunshine
In Index, Washington, the average sunshine in April is 7h.UV index
January through April, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Index. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum UV index of 2 during April translates into these guidelines:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. The solar radiation around mid-day is intense; avoid the Sun and stay safe. To cut down UV radiation exposure by about half, sport a wide-brim hat. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Index in April?
What is the average humidity in April in Index?
How much does it rain in Index in April?
What is the last month it snows in Index?
How many hours of daylight does Index have in April?
What time are sunrise and sunset in April in Index?
How many hours of sunshine does Index have in April?
When is the lowest UV index in Index?
What is the UV index reading in April in Index?
Average temperature in April
Index, WA
- Average high temperature in April: 51.1°F
The warmest month (with the highest average high temperature) is August (73.4°F).
The month with the lowest average high temperature is December (38.3°F).
- Average low temperature in April: 34.7°F
The month with the highest average low temperature is August (48°F).
The coldest month (with the lowest average low temperature) is December (28.6°F).
Average pressure in April
Index, WA
- Average pressure in April: 30.03"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is August (29.99"Hg).
Average wind speed in April
Index, WA
- Average wind speed in April: 3.7mph
The windiest month (with the highest average wind speed) is January (4.8mph).
The calmest month (with the lowest average wind speed) is August (3.2mph).
Average humidity in April
Index, WA
- Average humidity in April: 84%
The months with the highest relative humidity are January, February and March (88%).
The month with the lowest relative humidity is July (72%).
Average rainfall in April
Index, WA
- Average rainfall in April: 4.25"
The wettest month (with the highest rainfall) is January (7.8").
The driest month (with the least rainfall) is August (0.79").
Average rainfall days in April
Index, WA
- Average rainfall days in April: 21.2 days
The month with the highest number of rainy days is March (22.3 days).
The month with the least rainy days is August (7.9 days).
Average snowfall in April
Index, WA
- Average snowfall in April: 0.35"
The month with the highest snowfall is February (5.43").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in April
Index, WA
- Average snowfall days in April: 0.8 days
The month with the highest number of snowfall days is February (5.2 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
Index, WA
- Average daylight in April: 13h and 4min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in April: 7h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The months with the least sunshine are January and December (Average sunshine: 3h and 42min).
Average sunshine days in April
Index, WA
- Average sunshine days in April: 7.3 days
The month with the most sunshine days is August (19.9 days).
The month with the least sunshine days is March (7 days).
Average UV index in April
Index, WA
- Average UV index in April: 2
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in April
Index, WA
- Average cloud cover in April: 58
The months with the most cloud cover are March and December (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in April
Index, WA
- Average visibility in April: 4mi
The months with the highest visibility are May, June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, April, November and December (4mi).
Index, Washington, USA
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