"Winter air" refers to the quality of air during the winter season. It describes the characteristics of the air during this time, such as being colder and often drier than air during other seasons. Full definition
This would be an awesome mask for after sun in the summertime and really good in the winter when your skin is so dry from dry winter air. (garnierusa.com)
Today, I'm not too sure my kids will ever experience the sensation of snow under their feet and pure, cold winter air in their lungs. (dotearth.blogs.nytimes.com)
In addition, in winter the air temperature reaches 26 degrees Celsius. (sonofabea.ch)