Thunder turns to rain

I play in my world and build. Perfect. And then it starts to thunder. After a while I quit the world (by the button "Quit to Title"). After I reopened the world, and the weather is reset to clear day and after 2 seconds it started to rain instead of thunder.

^{edit by [Mojang] Mega_Spud (Jay Wells)}

Steps to Reproduce:

• Start a thunderstorm (/weather thunder)
• Observe thunder and lightning storm
• Exit World, and re-enter again
• Notice the weather will just be rain, and no longer a thunder storm