Ron....
I love the San Antone area....
Don't worry about there Hills, there little swells at there best....
As said above, if it pokes, sticks, stabs, irrattes, they have it....
I have been there in April, and it was HOT, Matter of fact when ever I was there it was hot....
In the Morning if it is cool, you won't have to worry to much about the Snakes, they need to warm up first....
And yes it rains there in a heart Beat, just like 5 Min Monshoons are something, just wait a Min and it will be HOT again....
You'll love it.........