Upon examining the map of the shift in U.S. Hardiness Zones provided at Groovy Green, it appears my area has shifted from Zone 9b to Zone 10a in the past 15 years. I'll be taking a more critical eye to the traditional advice for raising any given plants in this area to ensure the heat won't kill 'em...
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Looking at those two US maps side-by-side is a bit errie. I don't know the history of hardiness zones so I don't know if it's normal for them to shift the way they have in last fifteen years, but combined with all the other changes in climate it's like a creepy picture, right in front of your eyes, that actually shows global warming heating the planet up.