As one would expect from such a large country, the climate varies from region to region and the difference in temperature between summer and winter, north and south, can be significant.
Due to the influence of subtropical high-pressure systems, there is considerable seasonal variation in humidity as well as temperature. The two main differences in the climate of Saudi Arabia can be felt between the coastal areas and the interior. It is not unusual for temperatures to reach over 50°C (120°F) in the central desert in the peak summer months of July and August, and yet dip towards zero in the far north of the country during the mid-winter. The average summer temperature is around 45°C. In the winter, the temperature seldom drops below 0°C, and in the spring and autumn the heat is tempered, with temperatures averaging around 29°C – both daytime and evenings can be pleasant outside the summer peak.
As all private residences, cars and public buildings are all very well air-conditioned, it is possible to remain comfortable – even in the height of summer!