What is "hot weather"

Usage examples of "hot weather".

The one that destroyed the Hamorian raiders encouraged Recluce's fields and orchards to leaf out too much for the hot weather that followed.

Most people hike from south to north with spring, ideally keeping one step ahead of the worst of the hot weather and the more irksome and infectious of insects.

I wonder if it's the hot weather that is making tempers so irascible.