When comparing polar and non-polar molecules of similar size how do their melting and boiling points compare?

Polar molecules of smilar size to non-polar molecules have a higher melting and boiling point due to their stronger force of attraction.. eg. CO2. which is non-polar, you can can find free floating in the atmosphere whereas a polar molecule such as Water, doesn't boil until it reaches at least 100(Co) degrees. i like dump