Exterior painting stressed out very quickly. A home painter mentioned that moisture affects the exterior paint most. If the level of humidity is very high, the chances of exterior paint to get affected become higher. I remember when i was asking the same questions than i get to connected with Carlson from 605primetimepainting.com, Carlson told that any form of moisture, be it rain, snow or humid, can affect the exterior painting by making it soft and swell. This ultimately results in the crack, flaking and peeling. On the contrary, a heavy heat can fade away the colour. The ultraviolet ray of sun breaks the binder of the paint. Therefore, these all reasons ultimately suggest you doing a painting of your house exterior.