I put some wet Polyester clothes outside for the night (the clothes were washed by hand with pretty cold water -maybe around 4°C- and wringed by hand so there was still water dropping of them when I put them outside). It was -4°C went I put them. One hour later I checked the clothes and they were totally frozen. In the morning (before sun rise) the clothes were dry : it was -6°C. The sky was clear (almost no clouds) and there was no wind.
I am quite surprise that my clothes can dry in less than 10 hours with such a low temperature. This answer explains that the process is called sublimation but it doesn't explain where does the energy needed for the water to sublimate comes from ? In my case there was no sun, no wind, no temperature above 0°C.