April weather forecastGrand Coulee, WA
April
Weather in April
April in Grand Coulee, Washington, is a mild spring month, with an average temperature fluctuating between 57°F (13.9°C) and 37.9°F (3.3°C).Temperature
Entering April, Grand Coulee sees a temperature rise, with the average high-temperature advancing from March's chilly 46°F (7.8°C) to a refreshing 57°F (13.9°C). April brings Grand Coulee a consistent average low-temperature of 37.9°F (3.3°C).Humidity
In April, the average relative humidity is 59%.Rainfall
In Grand Coulee, in April, it is raining for 11.1 days, with typically 0.79" (20mm) of accumulated precipitation. In Grand Coulee, during the entire year, the rain falls for 102.1 days and collects up to 9.65" (245mm) of precipitation.Snowfall
Months with snowfall are January through April, September through December. April is the last month it regularly snows. During 0.8 snowfall days, in April, Grand Coulee aggregates 0.39" (10mm) of snow. In Grand Coulee, during the entire year, snow falls for 33.4 days and aggregates up to 14.65" (372mm) of snow.Daylight
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
In Grand Coulee, the average sunshine in April is 10.1h.UV index
In April, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum UV index, 4 during April, leads to the following recommendations:
Exercise care. People with light skin might get burns in fewer than 30 minutes. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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 42min
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 6min
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).
