Index, WA has a mild climate with warm summers and cool winters. The average temperature in the summer months ranges from the mid-60s to low 80s. In the winter months, temperatures range from the mid-30s to low 50s. Rainfall is fairly consistent throughout the year with an average of about 150 days receiving measurable precipitation every year. Snowfall is also common in Index during the winter months, although it rarely accumulates more than a few inches at a time. Overall, Index has some of the most pleasant weather in Washington state.
Index, Washington gets 73 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Index averages 17 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 161 sunny days per year in Index. The US average is 205 sunny days.
Index gets some kind of precipitation, on average, 184 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 76 degrees
Winter Low: the January low is 34
Rain: averages 73 inches of rain a year
Snow: averages 17 inches of snow a year