Best time of year to get plastic surgery in Korea?

I have flexibility in when I can travel to Korea for plastic surgery. Is there a best time of year to go? I have heard that extreme temperatures (hot or cold) can affect recovery. Also, are there certain times when clinics are less busy and prices might be better? I am thinking of either spring or fall. Are there any Korean holidays I should avoid when clinics might be closed? I am planning to get rhinoplasty and would like to minimize any weather-related complications during my recovery.