Rock Island, WA has a mild temperate climate with cool summers and cool winters. Average daytime temperatures range from the low 40s during the winter to the mid-60s in the summer. Precipitation is evenly distributed throughout the year, with an average of 30 inches of rain annually. The area generally experiences low humidity levels and relatively frequent sunny days, making it a great place for outdoor activities and leisurely walks in nature.
Rock Island, Washington gets 14 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Rock Island averages 60 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 200 sunny days per year in Rock Island. The US average is 205 sunny days.
Rock Island gets some kind of precipitation, on average, 78 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.
Weather Highlights
Summer High: the July high is around 85 degrees
Winter Low: the January low is 24
Rain: averages 14 inches of rain a year
Snow: averages 60 inches of snow a year