Sensor for drying washing outside

Hi All,

I have a Netatmo weather station at home and was wondering if anyone had created a sensor to determine the chances of your washing drying outside.

I have looked into it a bit on the web, and (from the Netatmo sensors on the outdoor module), there is a correlation between humidity (the main one), temperature and wind.

I was thinking about using an input select to display:

Washing will dry
Washing may dry
Forget it!

it seems that washing will dry definitely under 70% humidity and above zero degrees centigrade, but has anyone taken a look into the science behind this?

Any help would be appreciated!