Summers are hot and dry, winters mild and dry. Down in the south of Baluchestan, along the coast of the sea of Oman, the climate is similar to that of the Persian Gulf region, or even hotter, with strong winds in summer. There is very little rain throughout southeast Iran and frost would be a great novelty. Spring and autumn are the ideal times to tour Iran, but summer or winter can be OK, so long as you do a little planning and take a few precautions. The northwest of the country is generally the coldest and among the rainiest parts of the country.
Snow frequently remains until early spring, or even later in the mountains.
Wind is undoubtedly the most unpleasant element especially from June in the east of the country. In all seasons, sudden gusts cause whirlwinds and sandstorms. But the coastal regions have quite a different climate. The Caspian coast is damp all year round and provides a pleasant contrast with the dryness of plateaus which are only a few hours away by road. But the temperatures are rarely excessive.