Does climate affect human temperament?

This question is in reference to both the broader and the smaller scales.

If you have lived in both a cold and warm climate, have you noticed a change in attitude of the people who reside there?

Do equatorial islands evoke a long-lasting sense of peace and paradise, or is it just long enough for tourists?

Are the cold hills and valleys of the northern forests just what is needed for some calm time to think? or do they breed harsh feelings of isolation and fear in the population.

Do nations nearer the poles have steadier political histories because of this? Why?

Chile vs Cuba, New Zealand vs Cambodia, Canada vs Mexico and Scandinavia vs The Middle East.

In my mind the colder regions seem to be less embroiled in conflict through history and I was wondering if this is totally down to religion and trade resources, or partially down to the climates effect on human psyche.