When you take care of the prairies you're also taking care of the wildlife.
It creates a mosaic of different habitats at different stages of restoration.
It's more related to plant biology than weather. But weather is a deciding factor on whether or not you can burn on any given day.
It'll green up quickly. The big, burned blackened area acts as a solar collector, and the soil, in a week's time, will be 20 degrees warmer in the burned area than in the non-burned area so you can see how it speeds up the growth of the warm season native grasses.
In my life I've burned over 1,000 acres and never had a fire get away and cause any problem. It's an extremely controlled art. When folks see it for the first time they're amazed at how safe and secure a process it is.