Do mosquitoes usually bite during winter in india? Do I need malariz prophylaxis in jan?

Depends on area. Mosquitoes can survive in winter and do bite. In india malaria risk is small in the north and south, where most touristic areas are. Risk is higher in central part and the eastern part, including goa calcutta and assam. Mosquito repellents are essential everywhere because there are other diseases than malaria. Malaria prophylaxis is advisable in the areas i mentioned.