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
As April sets, the average high-temperature shows an increase, moving up from a frosty 46°F (7.8°C) in March to a refreshing 57°F (13.9°C). Throughout April, the temperature falls to an average low of 37.9°F (3.3°C).Humidity
The average relative humidity in April is 59%.Rainfall
In Grand Coulee, during April, the rain falls for 11.1 days and regularly aggregates up to 0.79" (20mm) of precipitation. Throughout the year, there are 102.1 rainfall days, and 9.65" (245mm) of precipitation is accumulated.Snowfall
January through April, September through December are months with snowfall. April is the last month it regularly snows in Grand Coulee. During 0.8 snowfall days, in April, Grand Coulee aggregates 0.39" (10mm) of snow. Throughout the year, there are 33.4 snowfall days, and 14.65" (372mm) of snow is accumulated.Daylight
In Grand Coulee, the average length of the day in April is 13h and 41min.On the first day of April, sunrise is at 6:32 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 5:37 am and sunset at 8:08 pm PDT.
Sunshine
The average sunshine in April in Grand Coulee is 10.1h.UV index
The average daily maximum UV index in April is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: A daily high UV index of 4 in April leads to these guidelines:
Exercise care. People with light skin might get burns in fewer than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Frequently asked questions
What is the average April temperature in Grand Coulee?
What is the average humidity in April in Grand Coulee?
How many days does it rain in April in Grand Coulee?
What is the last month it snows in Grand Coulee?
How many hours of daylight does Grand Coulee have in April?
When is the sunrise / sunset in April in Grand Coulee?
How long on average sun shines in April in Grand Coulee?
What is the UV index reading in April in Grand Coulee?
Average temperature in April
Grand Coulee, WA
- Average high temperature in April: 57°F
The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is December (31.6°F).
- Average low temperature in April: 37.9°F
The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is December (21.4°F).
Average pressure in April
Grand Coulee, WA
- Average pressure in April: 29.98"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in April
Grand Coulee, WA
- Average wind speed in April: 7mph
The windiest month (with the highest average wind speed) is April (7mph).
The calmest month (with the lowest average wind speed) is January (4.9mph).
Average humidity in April
Grand Coulee, WA
- Average humidity in April: 59%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is August (36%).
Average rainfall in April
Grand Coulee, WA
- Average rainfall in April: 0.79"
The wettest months (with the highest rainfall) are May and December (1.18").
The driest months (with the least rainfall) are July and August (0.2").
Average rainfall days in April
Grand Coulee, WA
- Average rainfall days in April: 11.1 days
The month with the highest number of rainy days is March (12.1 days).
The month with the least rainy days is August (3.2 days).
Average snowfall in April
Grand Coulee, WA
- Average snowfall in April: 0.39"
The month with the highest snowfall is January (4.41").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days in April
Grand Coulee, WA
- Average snowfall days in April: 0.8 days
The month with the highest number of snowfall days is December (10.5 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in April /
Average sunshine in April
Grand Coulee, 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: 10h and 1min
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 6min).
Average sunshine days in April
Grand Coulee, WA
- Average sunshine days in April: 15.8 days
The month with the most sunshine days is August (25.8 days).
The month with the least sunshine days is March (14.7 days).
Average UV index in April
Grand Coulee, WA
- Average UV index in April: 4
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in April
Grand Coulee, WA
- Average cloud cover in April: 33
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility in April
Grand Coulee, 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).
Grand Coulee, Washington, USA
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