From 1981 to 2010, the average annual precipitation measured at Seattle-Tacoma International Airport was 37.49 inches (952 mm). Annual precipitation has ranged from in 1952 to in 1950; for water year (October 1 - September 30) precipitation, the range is in 1976-77 to in 1996-97. Due to local variations in microclimate, Seattle also receives significantly lower precipitation than some other locations west of the Cascades. Around to the west, the Hoh Rain Forest in Olympic National Park on the western flank of the Olympic Mountains receives an annual average precipitation of . Sixty miles (95 km) to the south of Seattle, the state capital Olympia, which is out of the Olympic Mountains' rain shadow, receives an annual average precipitation of . The city of Bremerton, about west of downtown Seattle on the other side of the Puget Sound, receives of precipitation annually.