April weather forecastSumas, WA
April
Weather in April
April is a cool spring month in Sumas, Washington, with temperature in the range of an average high of 54°F (12.2°C) and an average low of 38.1°F (3.4°C).Temperature
April's arrival coincides with a marginal rise in the average high-temperature, moving from March's chilly 47.1°F (8.4°C) to a fresh 54°F (12.2°C). April nights observe an average temperature dip to a wintry 38.1°F (3.4°C).Humidity
In April, the average relative humidity is 81%.Rainfall
In Sumas, during April, the rain falls for 18.7 days and regularly aggregates up to 3.66" (93mm) of precipitation. Throughout the year, in Sumas, there are 188 rainfall days, and 49.88" (1267mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. April is the last month it regularly snows. During 0.4 snowfall days, in April, Sumas aggregates 0.16" (4mm) of snow. In Sumas, Washington, during the entire year, snow falls for 14.7 days and aggregates up to 10.2" (259mm) of snow.Daylight
In April, the average length of the day is 13h and 46min.On the first day of April, sunrise is at 6:44 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 5:48 am and sunset at 8:24 pm PDT.
Sunshine
In Sumas, Washington, the average sunshine in April is 7.6h.UV index
The average daily maximum UV index in April in Sumas is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: The daily maximum UV index of 3 in April interprets into the following advice:
Preventative actions are necessary - Recommendations to ward off sunburn are given. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Sumas, WA
- Average high temperature in April: 54°F
The warmest month (with the highest average high temperature) is August (73.6°F).
The month with the lowest average high temperature is December (39.6°F).
- Average low temperature in April: 38.1°F
The month with the highest average low temperature is August (51.4°F).
The coldest months (with the lowest average low temperature) are February and December (31.6°F).
Average pressure in April
Sumas, WA
- Average pressure in April: 30.03"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March and August (30"Hg).
Average wind speed in April
Sumas, WA
- Average wind speed in April: 4.1mph
The windiest months (with the highest average wind speed) are January and February (4.7mph).
The calmest month (with the lowest average wind speed) is August (3.2mph).
Average humidity in April
Sumas, WA
- Average humidity in April: 81%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is July (73%).
Average rainfall in April
Sumas, WA
- Average rainfall in April: 3.66"
The wettest month (with the highest rainfall) is November (7.72").
The driest month (with the least rainfall) is July (0.91").
Average rainfall days in April
Sumas, WA
- Average rainfall days in April: 18.7 days
The month with the highest number of rainy days is March (20.5 days).
The month with the least rainy days is August (7.8 days).
Average snowfall in April
Sumas, WA
- Average snowfall in April: 0.16"
The month with the highest snowfall is February (3.11").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in April
Sumas, WA
- Average snowfall days in April: 0.4 days
The month with the highest number of snowfall days is February (4.7 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
Sumas, WA
- Average daylight in April: 13h and 48min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in April: 7h and 36min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 3h and 48min).
Average sunshine days in April
Sumas, WA
- Average sunshine days in April: 9.3 days
The months with the most sunshine days are July and August (21 days).
The month with the least sunshine days is March (8.4 days).
Average UV index in April
Sumas, WA
- Average UV index in April: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in April
Sumas, WA
- Average cloud cover in April: 54
The month with the most cloud cover is March (Cloud cover 60).
The months with the least cloud cover are July and August (Cloud cover 30).
Average visibility in April
Sumas, WA
- Average visibility in April: 5mi
The months with the highest visibility are April, May, June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, November and December (4mi).
