The diversity of the geographical features of the state has resulted in a corresponding diversity in climate. The High Ranges have a cool and bracing climate throughout the year, while the plains are hot and humid.
The average level of annual rainfall is quite high when compared to other Indian states, almost three times higher than in Karnataka while twice than in Tamilnadu. The state basically enjoys 4 types of climate such as Winter ,Summer ,South West Monsoon and North East Monsoon

The winter season sets in during the month of December and continues till end of February. During this season comparatively there is less rainfall especially in the northern parts of the state.

Winter is followed by the summer season. It starts in February and continues till May. Temperature is very high during this period. Occasional showers with Lightning is a characteristic of this season. Kottayam receives the highest rainfall during this season.

The annual range of temperature is comparatively low in Kerala. The coastal areas record a maximum temperature of 32oc and a minimum of 22oc. The interiors record a maximum of 37oc during summer. In the coastal area it is hot and humid during April-May while cool during December-January.