Is it a good idea to paint during Winter?
Absolutely not accurate!!!!!!   There is no reason not to paint inside as long as temps are above 60F. Today's latex acrylic paints dry fast, adhere well, and apply well in moderate temps.( we always use some flowtrol to make it work longer and spread smoother) Actually, in winter the relative humidity is usually lower, so paint dries faster than in the heat and humidity of summer. Longer dry times lets more dust adhere.   Go for it during the winter, then you will have more time to enjoy the out of doors come summer time!!!!