The Pacific Ocean is cooler than the land, so it doesn't provide hot humid air like other regions. It actually makes it cooler along the coast than inland. July is a sunny month for the northwest. The coldest recorded temperature is - 70 degrees Fahrenheit in Rodgers Pass, Montana on January 20, 1954. For more climate data, look at the Weather Research Center site.
Climate data is listed for many cities, including temperature and precipitation information.