Because Western Washington is surrounded by the Pacific Ocean and Puget Sound, air temperature changes more slowly than in Eastern Washington, where water is scarce. The combination of temperature, humidity and wind speed can make the air feel hotter or cooler than the actual temperature. Wind makes us feel cooler. High humidity makes a hot day feel hotter. Dew point Dew point is the temperature at which air becomes saturated, or unable to hold additional moisture.
Warm air can hold more water vapor than cool air.
When the temperature drops during the night, the air can't hold as much moisture, and dew forms. Barometer Barometric pressure is a measure of the weight of the air pressing down on us. Cold, dry air weighs more than warm, moist air. Watching how the pressure changes over time tells more than the pressure alone. Rising pressure usually indicates that a high pressure system is approaching, typically bringing clearing skies.