The lifestyle of the foreigner will be better than that of a local because of the differences in salary. Pollution is a problem here, though not to the degree that is often found in Asia. Environmental awareness is only just beginning. As with anywhere, it depends on the employer and the people you meet. Macedonians do tend to keep to themselves, unless they have had some kind of previous contact with Western Influence.
Summer is very warm.
Humidity is low because Macedonia is landlocked and mountainous. Winter is grey and misty. Food is very much like Greek food and there are many preserves made in the fall to eat through the winter. Produce in winter is limited but plentiful in summer. You can buy many groceries to cook your own Western style meals.