Why does San Diego have warmer weather than Seattle?

- Latitude: San Diego is located at a lower latitude (32.72 degrees North) compared to Seattle (47.61 degrees North). As you move closer to the equator, the climate tends to be warmer due to the increased intensity and duration of solar radiation received throughout the year.

Proximity to the Pacific Ocean:

- Oceanic Influence: San Diego is situated along the Pacific coast, while Seattle is further inland. Coastal cities often experience a moderating effect on their climate due to the influence of the ocean. The Pacific Ocean acts as a heat reservoir, releasing moisture and warm air onto the coastal areas, which helps maintain a warmer climate in San Diego.

Prevailing Wind Patterns:

- Jet Stream: The prevailing wind patterns and movement of the jet stream play a role in shaping regional climates. San Diego is typically influenced by the subtropical jet stream, which brings warmer air from lower latitudes. Seattle, on the other hand, is often affected by the polar jet stream that originates in the polar regions, bringing cooler air masses.

Influence of Coastal Currents:

- California Current vs. Pacific North Current: The California Current, a cold ocean current, flows southward along the coast of California, including San Diego. However, the Pacific North Current, a warm ocean current, flows northward along the coast of Washington, including Seattle. This difference in ocean currents also influences the local climate.

Coastal Mountains and Topography:

- Mountain Ranges: San Diego is located in Southern California, which has a relatively lower elevation and lacks major mountain ranges nearby. Seattle is situated in the Pacific Northwest, which has the Cascade Range to its east. These mountain ranges can block or divert certain prevailing wind patterns, affecting regional temperature and precipitation patterns.

Air Masses and Storm Tracks:

- Air Masses and Fronts: San Diego experiences more frequent interactions with warmer air masses from the south, such as the Santa Ana winds. Seattle is more influenced by cooler air masses from the north and experiences more frequent frontal systems, which can bring cooler and wetter weather.

In summary, San Diego's warmer weather compared to Seattle can be attributed to its geographic location at a lower latitude, proximity to the Pacific Ocean with a moderating effect, prevailing wind patterns, the influence of ocean currents, coastal topography, and the movement of air masses and storm tracks.