Stay indoors, in a well ventilated temperature controlled 100% O2 environment.
Well eat healthy, get plenty of sleep, try B complex vitamins, multi vitamin as well as C
I take 2000 mg of C in winter which does me well
The weather itself doesn't really make you sick but if your immune system is weak you are indeed more susceptible to bacteria and viruses and changes in body temperature can make some dormant and others to become more active
Use a sun lamp in winter. The full spectrum light stimulates seratonin
Stretch
Take a daily vitamin, especially D in winter
Exercise
Don't gorge on food, but don't skimp either
Yes, some people are not able to cope up with weather fast
Do yoga regularily
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my health becomes serious because of change in weather! this affect my studies very much! so give me some tips!