However when it is very cold the air is much drier. Contrast that to a temperate but humid climate where everything sits at 20C - 25C w/80% - 100% humidity. Practically a microbial incubator.
- ideally machine washed with a significant spin to remove water. Air drying hand washed items that are sopping wet is a lot harder - might take 4x longer
- hang in a room with decent ventilation and some active air flow. Trying to air dry in the equivalent of a cupboard would be doomed
- hang fully spread out with decent space between the clothes. Drying time will be significantly extended if densely scrunched together with pieces touching. Buy multiple racks to get enough hanging space.
- don't put used wet gym clothes in a laundry bin to fester. If you aren't washing them immediately, hang them up to dry first and put them in the bin later
No issues, summer or winter.
Drying time here (Norway) in winter is about the same as high humidity was in the US. Summer is the dry season here - there is often a forest fire watch and a ban on open flames/fires.
In general, as long as there is air flow, you are fine. It'll take longer/shorter depending on humidity and air temperature.