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Not in heavy UV light they aren't.
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CFCs measured at about 35 km altitude is about 0,1 parts per trillion (ppt), and that's because CFCs are about 4,5 times heavier than air. The UV radiation with the necessary energy for splitting the CFCs molecules are well above the 45 kms, where no CFCs are found. That UV radiation is known as UV-C. But even if those 0,1 pppt of CFCs release their chlorine atoms, the they cannot react with ozone due to the gaseous phase of chemistry.
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Weather patterns. You might as well ask why water collects in puddles, when the rain coats an area evenly.
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Nice try, but incorrect. Chlorine cathalytic reaction allegedly responsible for destroying ozone in the infamous layer has never been demonstrated in any lab essays. They tried many times, but nothing happened. It all relates to the "gaseous phase" of chemical reactions: chlorine only reacts with ozone over the solid surface of ice crystal in the polar clouds over Antarctica. Ask your chemistry professor.
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It's a bad UV-A filter, a good UV-B filter, and an excellent UV-C filter.
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UV radiation with the energy enough to split the highly stable CFC molecule is found well above the 40 km mark, the region where oxygen (although one of the strongest gas molecules –along with nitrogen- it is not as stable as the CFC molecule) absorbs almost all the UV-C radiation that could dissociate the CFC molecules.
Now, if you want to blame something, someone about the ozone hole over the Antarctic, blame the Mother Earth, it produces a hundred thousand times more chlorine than man every year. It's a natural phenomenon, already noticed back in the 50's.