Why do I keep getting colds all the time it does change weather all the time could that be why? And is it bad?

Colds. Colds are usually viral related but can be related to barometric change as in the weather. You may get relief with an antihistamine.
Freq. Colds. Your immune system resistance may be low. Some of the colds may be allergy, or chronic sinus infection. Improve diet, more fruits and veggies. Low sugar. See allergist re: boosting immune system to allergic substances. Take daily vitamin d3 to get into optimum range. Review medications as they may be bothering you.