Vinyl siding is susceptible to damage from heat. A high heat source will melt and warp the siding, which happens in extremely hot climates or in very sunny areas where reflective windows sharpen the power of the sun to create more heat on the vinyl. You must also be careful when using anything hot around the vinyl siding of your house. A barbecue is a common cause of heat damage to vinyl siding; barbecue far away from any vinyl products.
Your vinyl siding should withstand strikes from smaller hail stones. However, in some regions hail may range from the size of a golf ball to the size of a baseball. No vinyl siding can stand up to pelting from stones of that size. Hailstones that strike vinyl siding will either crack the material in the middle of the panel or bash chips out of the ridges where the siding overlaps.
Extreme temperatures in either direction are quite hard on vinyl siding. In the north where winter temperatures stay consistently well below freezing, vinyl siding sometimes becomes brittle. If this happens, all that's required is a light impact or the weight of a snow drift pressing against the vinyl to cause cracks. Protect the vinyl from any pressure and especially from any impact during cold winters.
High winds peel vinyl siding away from the house in severe storms. This sort of problem needs to be fixed quickly. If you leave a panel that has peeled away from the house, it provides an ideal opening for moisture to start getting into your home and behind the rest of your siding. In addition to the damage it can cause on its own, that moisture creates a good growing environment for molds.