But no reason to get worried quite yet.
|This histogram shows the frequency that the first official cold front (i.e. two consecutive nightly lows below 60° F) arrives to Naples Florida, as based on the historical record from 1941 to present.|
Some years we get what I call a teaser front (i.e. 2000) in early October, but most years (as shown by the distribution curve above) our first real dose of cold air doesn't arrive until a week or two on either side of Halloween.
Although some years we have to wait a longer than that, (i.e. 1986, 2013).
I can't say exactly for this year's other than by Thanksgiving it most likely will have arrived.