September in Naples

September's rain and heat numbers at Naples Municipal Airport come from the National Centers for Environmental Information's 1991 to 2020 climate normals, station USW00012897. In that record, September carries a normal 8.60 inches of rain, the second highest of the twelve monthly normals, alongside a normal average temperature of 82.4 F, a normal high of 89.6 F and a normal low of 75.1 F.

Those four numbers are a thirty-year average, not a forecast, and they say nothing about the condition of any one roof, driveway or window. What they describe is the month itself: warm around the clock and wetter than all but one other month of the year. The other eleven months are in the seasons hub's twelve-month table.

September's rainfall normal is not the only calendar that lands hard in these four weeks. The National Hurricane Center puts the statistical peak of the Atlantic hurricane season at September 10, “with most activity occurring between mid-August and mid-October.”

August is the wettest month in the Naples normals at 8.89 inches and September's 8.60 inches is the second highest of the twelve, so the two heaviest months of the year run back to back. September 10 falls inside the second of them. The rainfall figure and the peak date come from two independent records, a thirty-year average of what fell and a climatology of when Atlantic storms have historically clustered, and September is where the two overlap.

The Asphalt Roofing Manufacturers Association writes that algae growth “occurs to varying degrees in all regions of the U.S. and southern regions of Canada, especially those subjected to warm, humid conditions.” The algae's natural pigments, the same bulletin adds, “may cause white or light-colored roofs to gradually turn dark brown or black.” Naples in September holds a normal average temperature of 82.4 F and 8.60 inches of normal rain.

The Tile Roofing Industry Alliance describes a different mechanism on tile, where the growth sits on the dust and organic material that settles on the surface rather than on the tile itself, and where cycles of heat, moisture and light are what set it going. What those streaks actually are, on tile and on shingle, is set out on the black streaks on a Naples roof.

On tile there is a second constraint, and it does not depend on the month: Eagle Roofing Products, a concrete tile manufacturer, tells owners of a concrete tile roof to stay off it, because walking on or putting pressure on a tile can potentially damage it. The maker's own wording, and what it means for who does the work, is on who should be on the roof.

See how soft washing works for the method a roof cleaning actually follows.

Sealing a paver surface turns on one published condition, and a trade institute and a sealer manufacturer put the same number on it. ICPI Tech Spec 5 states: “The cleaned surface must be completely dry prior to applying most sealers. Allow at least 24 hours without moisture or surface dampness before application.” SEK-Surebond's own site-preparation bulletin sets the identical window: “it is highly recommended that the surface be free from any moisture/rain/water for a minimum of 24 hours prior to the application of most sealers.”

September's normal 8.60 inches of rain is what that 24 hour window has to fit inside. SEK's separate guidance for its polymeric jointing sand adds a forecast test on top of it, requiring that “there is no rain forecasted for at least 12 hours after installation.” Neither document names a month; both name a condition, and Naples' wettest stretch is simply where that condition takes longer to arrive.

On pavers installed during a dry stretch, ICPI observes that the next wet weather may sometimes be needed before efflorescence shows, an observation about new concrete pavers rather than a Naples peculiarity. What that white bloom is, and why ICPI says it does not affect a paver's structural performance or durability, is set out on why sealed pavers turn white, cloudy or slippery.

See how paver sealing works for the sequence itself, from the clean to the cure.

Heat changes how glass gets cleaned before rain does. The National Glass Association advises: “Cleaning tinted and reflective glass surfaces in direct sunlight should be avoided, as the surface temperature may be too hot for optimum cleaning.” The PGT, CGI and WinDoor care guide gives homeowners the same timing tip in its own words: “For the best results, clean your glass during cooler temperatures without direct sunlight.” Neither document names a temperature. Both name a condition, and September's normal high at Naples Municipal Airport is 89.6 F, with a normal low of 75.1 F.

The same care guide gives owners a routine item of their own: inspecting and cleaning the weep systems that drain a window, routinely rather than after a storm. It sits with the rest of the frame guidance on frames, drainage and how often coastal glass needs cleaning.

A roof job and a window job on the same property are not unrelated, either. The National Glass Association names “Bleach (or other solutions containing sodium hypochlorite)” among the materials that “may cause harm” when laminated glass is cleaned, and laminated glass is what an impact window is made of. What that means for the pane under a roof is set out on what an exterior cleaner has to know about impact and coated glass.

See how exterior glass gets cleaned for the method itself, and for what has to be identified about a pane before anything touches it.