Why lightnings strike in summer?

Answer 1

First of all lightening not only strike in summers but whenever any thunderstorm if there over the place. However we can say that heavy lightening is frequent in summer season because due to unstable atmosphere and high freezing level generates thunderstorms of great height. This is the reason that great amount of positive charge get accumulated at the base of the cumulonimbus clouds which causes heavy lightening.

Answer 2

Lightning is more common in summer due to the increase in atmospheric instability caused by warm air rising and interacting with cooler air. The convective activity in the atmosphere during summer months creates the conditions necessary for thunderstorms to form, leading to an increased likelihood of lightning strikes.