Changes In California's Rainy Season

Recently, I have been looking over the Climate Station Precipitation Summary by the National Oceanic and Atmospheric Administration. I noticed that the rainy season seems to have changed significantly over the years. An article I read by Yale Environment 360 confirmed my suspicion. The California rainy season now starts a whole month later than just 60 years ago. With the season generally only lasting 4 months, the start date occurring a month later is drastic change. The rain coming later results in warmer and dryer weather due to a larger overlap between the wildfire season and high winds.

Why Is This Occurring?

Air in the atmosphere moves around the world in a somewhat predictable manner called global atmospheric circulation. More rain is coming towards Washington and Oregon due to change in these atmospheric circulation patterns. Though there is not yet sufficient data on the involvement of fossil fuel emission in this rainy season change, what has been found suggests that the warming climate is certainly partially responsible for the climate models anticipating drier seasons.