Like the rest of the Salish Sea and surrounding regions, the climate of the Strait is disputed, with the Köppen system classifying it as Mediterranean, but most regional climatologists preferring oceanic. While the climate is mostly oceanic in nature, the dry summers result in the Mediterranean classification in the Köppen system. Rainfall ranges from over conditions at the west end to as little as at the east end, near Sequim. Because it is exposed to the generally westerly winds and waves of the Pacific, seas and weather in Juan de Fuca Strait are, on average, rougher than in the more protected waters inland, thereby resulting in a number of small-craft advisories.
This strait remains the subject of a maritime boundary dispute between Canada and the United States. The dispute is only over the seaward boundary extending west from the mouth of the strait. The maritime boundary within the strait is not in dispute. Both governments have proposed a boundary based on the principle of equidistance, but with different basepoint selections, resulting in small differences in the line. Resolution of the issue should be simple, but has been hindered because it might influence :Category:Canada–United States border disputes|other unresolved maritime boundary issues between Canada and the United States. In addition, the government of British Columbia has rejected both equidistant proposals, instead arguing that the Juan de Fuca submarine canyon is the appropriate "geomorphic and physiogeographic boundary". The proposed equidistant boundary currently marks the northern boundary of the Olympic Coast National Marine Sanctuary. British Columbia's position is based on the principle of natural prolongation which developed in international law. It poses a dilemma for the federal government of Canada. If Canada holds that the principle of natural prolongation applies to the Juan de Fuca Canyon on its Pacific Ocean coast, the assertion could undermine Canada's argument in the Gulf of Maine boundary dispute. In this Atlantic Ocean context, Canada favours an outcome based on the principle of equidistance.
Salish Sea
In March 2008, the Chemainus First Nation proposed renaming the strait the "Salish Sea", an idea that reportedly met with approval by British Columbia's Aboriginal Relations Minister Mike de Jong, who pledged to put it before the B.C. cabinet for discussion. Making Salish Sea official required a formal application to the Geographical Names Board of Canada. A parallel American movement promoting the name had a different definition, combining of the Strait of Juan de Fuca and Puget Sound as well as the Strait of Georgia and related waters under the more general name Salish Sea. This latter definition was made official in 2009 by geographic boards of Canada and the United States. In October 2009, the Washington State Board of Geographic Names approved the Salish Sea toponym, not to replace the names of the Strait of Georgia, Puget Sound, and Strait of Juan de Fuca, but instead as a collective term for all three. The British Columbia Geographical Names Office passed a resolution only recommending that the name be adopted by the Geographical Names Board of Canada, should its US counterpart approve the name-change. The United States Board on Geographic Names approved the name on November 12, 2009.
Counties and regional districts
Counties along the Strait of Juan de Fuca:
Clallam County, Washington
Jefferson County, Washington
Island County, Washington
Skagit County, Washington
San Juan County, Washington
Regional districts along the Strait of Juan de Fuca:
Capital Regional District, British Columbia
Cowichan Valley Regional District
Fauna
Certain groups of seabirds called common murre migrate north by swimming. Some Pacific Coast murres paddle north to the sheltered bays of the Strait of Juan de Fuca to feed on herring and other small fish.
Other
Some scenes from the film The Hunt for Red October were filmed in the Strait of Juan de Fuca in 1989. Douglas Coupland book Microserfs references the Strait of Juan de Fuca where the lead character's younger brother perished in a boating accident on Labor Day many years earlier.