Kuwait is one of the dry areas in general, It’s raining habits are a few on the whole, although they vary in time and place. Despite the small size of the country, the recorded rain levels by monitoring stations in one period is very diverse, although the expense ratios and averages reduces these variations to a large extent. The rainy season in Kuwait starts in November and ends in April, and little rain falls in the months of October and May, but rain could fall in the summer, which is what happened on the evening of May 25, 1956, when the city of Kuwait witnessed a rainy thunderstorm. Rains fall in Kuwait for two reasons; A) The atmospheric depression progressing from the eastern Mediterranean, particularly around the island of Cyprus - and going through the country and causes cyclonic storms in the areas it passes through according to its path. And B) Local thunder storms that result from heating the air at the Earth's surface and rising to the top where it cools off and formulates cumulus clouds that contain thickness and density to the extent that is sufficient to form thunderstorms and drop heavy rain.
Type A of rain comes in fall and winter, while more rain type B comes in the spring and especially in the months of April and May where the so-called "Al-Sarrayat". It is difficult here to formulate a clear system of rain in Kuwait, and it can be said generally that the summit of the rain is in January and the more we move away for this summit the lesser it rains.
A clear characteristic of rain in Kuwait is volatility evident in the quantity of the rain that have fallen through the years of monitoring, as well as spatial variation from one location to another. This is evident from comparing quantities of the standard monthly rates as we do not find a clear association between the two, as this is the nature of the desert climate. Although the month of January is considered the month of rain months of rain on average of (25.7 mm) and the month of December comes in second place (20.3), but standard amount of rainfall recorded in the months of November and February outstands that of the standard quantities of January and December.
The highest amount of rainfall during one month in the station was the month of November in the year 1997; 14.4 mm, equivalent to 53% of the total of rain during that year, and is also equivalent to 89% of the annual rate. But this quantity is not the highest amount recorded in the country, as Al-Ahmadi station recorded 180 mm in December 1956, and holds that as the highest record of the State of Kuwait.
The fact that the quantities of heavy and sudden rains are very important for a country whose resources of fresh water is relatively limited such as Kuwait. Light rain that falls in spray does not have clear benefits in light of the climatic conditions prevailing in Kuwait, as much of it evaporates before it can benefit from it.
Quota of the annual rainfall is 128.1 mm, while the amount of annual evaporation is 6000 mm. On average, this means that the amount of evaporation increases more than 50 times the amount of rainfall. The heavy rain that falls in a short time can be beneficial for a desert-like country like Kuwait as it leads to the flow of surface water in the valleys and to the infiltration of a large part of them into the ground to nourish the groundwater, as it provides the earth with quantities of water sufficient for the germination of weeds, which cover the earth and contribute in feeding grazing animals