Weather of Iran during summer becomes unbearable in some parts of the land, obviously the deserts regions. The intensity of heat rises to almost intolerable points, with the average daily temperature exceeding 38° C and above. In places like the Khuzestan plain, high humidity accompanies the summer heat.
The freezing Iran Weather in the winters is pleasant compared to the summer heat, yet unbearable in certain places like Tehran, where the night temperature drops to -3°C (27°F). In the north-western parts and on the mountain summits, snow falls profusely, with a sharp drop in temperature. However, the snowfall occurring on the peaks during winter forms the principal source of water used for irrigating the agricultural lands in early summer and spring.
The 'Fall' season or Spring in Iran is characterized by relatively mild and pleasant weather conditions. This is perhaps, the ideal time when tourism flourishes properly on the land, bringing in lots of money to the national exchequer.