What is the correct way to mock a final class with Mockito?

What is the correct way to mock a final class with Mockito?

I have a final class like this:

public final class RainOnTrees {
   public void startRain() {
        // some code here
   }
}

I am using this class inside another class:

public class Seasons {
   RainOnTrees rain = new RainOnTrees();

   public void findSeasonAndRain() {
        rain.startRain();
    }
}

In my JUnit test class for Seasons.java, I want to mock the RainOnTrees class. How can I do this using Mockito?