Winter can have some health benefits, but it can also have negative effects: 

Improved brain function: Colder temperatures can improve focus, boost brain activity, and help you think more clearly. 

Better sleep: Cold weather can lead to better sleep because your core temperature naturally drops when you're trying to sleep. 

Increased fat burn: Cold weather can increase your ability to burn fat. 

Reduced inflammation and pain: Cold weather can reduce inflammation and pain. 

Faster recovery from workouts: Runners who go out in the cold weather recover faster from their workouts. 

Boosted energy expenditure: Cold weather can boost your energy expenditure for hours after a workout. 

Improved mood: Lower temperatures can increase happiness and reduce stress. 

Disease prevention: Mosquitoes are cold-blooded and usually hibernate during winter, which can prevent diseases like dengue, zika virus, malaria, and filariasis.