The climate is transitional between marine west coast and continental. The heaviest precipitation occurs in winter, which also has the strongest marine influence in most years. The continental influence is most pronounced in summer, which is hot. The vegetation has a mixture of rain forest and dry interior plant species with bigleaf maple and western red cedar prominent among the rain forest species and ponderosa pine standing tall as one of the Interior species. Douglas-fir is the most common tree. Boston Bar is in the Interior Douglas-fir zone, wet warm subzone (IDFww).