| Mount Persis | |
| Elevation Ft: | 5464 |
| Prominence: | 544feet |
| Isolation Mi: | 1.59 |
| Isolation Ref: | [1] |
| Parent Peak: | Mount Index (5,991 ft) |
| Map: | Washington#USA |
| Etymology: | Persis Elmina Gunn |
| Country: | United States |
| State: | Washington |
| Region: | Snohomish |
| Region Type: | County |
| Range: | Cascade Range |
| Coordinates: | 47.7877°N 157.43°W |
| Topo: | USGS Index |
| Rock: | Volcanic rock |
| Age: | 38 million years |
Mount Persis is a 5464feet summit located in Snohomish County, of Washington state.[2] The mountain is part of the Cascade Range and is situated in the Mount Baker-Snoqualmie National Forest. The mountain was named for Persis Gunn (1846–1898), wife of homesteader/miner Amos Gunn who started the nearby town of Index, Washington, and also named nearby Mount Index. Precipitation runoff from the mountain drains into tributaries of the Skykomish River. Topographic relief is significant as the summit rises 4160abbr=offNaNabbr=off above Anderson Creek in 0.8 mile (1.3 km). The rocks of Mount Persis are volcanic in origin and are considered amongst some of the earliest expressions of volcanism in the Cascade Mountain range in Washington.
Mount Persis is located in the marine west coast climate zone of western North America.[3] Most weather fronts originating in the Pacific Ocean travel northeast toward the Cascade Mountains. As fronts approach the Cascades, they are forced upward by the peaks (orographic lift), causing them to drop their moisture in the form of rain or snowfall onto the Cascades. As a result, the west side of the North Cascades experiences high precipitation, especially during the winter months in the form of snowfall.[3] Because of maritime influence, snow tends to be wet and heavy, resulting in high avalanche danger.[3] During winter months, weather is usually cloudy, but, due to high pressure systems over the Pacific Ocean that intensify during summer months, there is often little or no cloud cover during the summer.[3] Due to its temperate climate and proximity to the Pacific Ocean, areas west of the Cascade Crest very rarely experience temperatures below 0°F or above 80°F.[3]