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Lows in the 40s to me, is a sure fire signifier (try saying that 5x fast) that fall has arrived. I'd like to see the first lows in the 40s between September 7-12th. But not on typical nights til around September 25th. We don't average a low in the 40s til September 22nd but we certainly can expect it sooner. Have yet to see it happen in summer, though. (Latest 40s I've seen are in May)
Tomorrow. It will let us revel in the luxury of coldness, after a 100-degree roasting recently.
The entire year has avg lows below 40 in my ideal climate. More specifically, the warmest avg low would be about 35F in mid July, so some of the warmer summer nights could be in the 40s or even 50s (but that's the exception not the rule).
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