Iran has a variable climate. In the northwest, winters are cold with heavy snowfall and subfreezing temperatures. Spring and fall are relatively mild, while summers are dry and hot. … In general, Iran has a continental climate in which most of the relatively scant annual precipitation falls from October through April.

Tehran, the Capital, in 4 Seasons
Tehran, at the foot of mount Damavand, through the seasons.
Spring, Summer, Fall, Winter