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Cold weather can cause older incandescent Christmas lights to fail by causing cracks in the finish or the glass itself. Modern LED lights are affected in the opposite way and perform even better as the temperature drops. 

No, you should not leave LED Christmas lights up all year. While the LED lights themselves are very durable, their wiring and casings can be as vulnerable as any Christmas lights. They’re subject to drying out, experiencing cold or sun damage that causes them to crack, and even damage caused by gnawing pests. (The same is true of incandescents.) If you want your lights to last the years that they’re rated for, bring them inside after Christmas is over. 

The length of time shouldn’t matter much if you stick with lightweight Christmas lights and similar decorations. Those shouldn’t pose risks to your stucco. You should avoid attaching anything to your stucco that could fall because it’s too heavy, which may take part of the stucco with it. Some methods, like using double-sided tape or adhesive hooks, will naturally wear out over time and lead to falling lights, so don’t expect to leave these lights up year-round.

It's safe to hang Christmas lights from gutters with a few considerations. First, when installing the lights, follow safe ladder-use guidelines and avoid getting onto the roof. Second, for best results and the integrity of your lights, use clips to keep the bulbs away from inside the gutters where they could run into trouble with water or ice.