The mechanism behind this predictability lies in the position of the North Pacific High, a massive area of high pressure that migrates northward during the summer months. As this cool, moist air moves eastward, it encounters the rising terrain of the Santa Monica Mountains and the San Gabriel Mountains, where it is forced to rise, cool, and release its moisture as rain, creating a rain shadow effect that leaves the eastern valleys significantly drier and warmer.
Coastal Versus Inland Temperature: Understanding the Differences
The Defining Mediterranean Pattern The dominant climate classification for the vast majority of Southern California is Csb, or warm-summer Mediterranean. Urban Environment and Future Projections.
While the region enjoys a reputation for perpetual sunshine, the reality involves distinct seasonal shifts in temperature, precipitation, and humidity that vary dramatically from the coast to the inland valleys and high desert. The Santa Ana winds are a regional phenomenon driven by high-pressure systems in the Great Basin and Nevada desert.
Coastal Versus Inland Temperature: Understanding the Differences
The coastal climate is heavily moderated by the cold California Current, which chills the air above it and creates a stable marine layer, or "May Gray" and "June Gloom," that often blankets the shoreline in low clouds and cool air during the morning hours. These winds are notorious for being hot, dry, and gusty, creating extreme fire danger by desiccating the chaparral and turning small sparks into conflagrations that can race across the landscape.
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