Planning Around the Transitions For travelers, the timing of seasonal shifts is critical for packing and itinerary planning. Season Astronomical Dates Meteorological Dates Summer June 20/21 – September 22/23 June 1 – August 31 Fall September 22/23 – December 21/22 September 1 – November 30 Regional Variations Across the State California's vast geography means that "when California" changes seasons varies dramatically by location.
When Does California Heat Intensity Start to Rise
Conversely, the Central Valley and desert regions can see extreme heat lingering long after the solstice, while the mountains may already be preparing for winter snowpack. Understanding when California experiences distinct seasonal shifts requires looking beyond a single date.
This astronomical event occurs when the Earth's axis is most inclined towards the sun, resulting in the longest day of the year. While the solstice marks the official astronomical start of summer, the feeling of summer heat often arrives earlier in many regions, driven by persistent high-pressure systems.
When Does California Heat Intensity Start to Rise
Astronomical summer, however, is based on the sun's position, starting on the solstice and lasting until the autumnal equinox. Astronomically, fall begins with the autumnal equinox, usually on September 22 or 23.
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