Universe Today was the first link on Google about the paper published in Nature today. They quote Christopher McKay, a scientist at NASA Ames:

“The rain on Titan is just a slight drizzle, but it rains all the time, day in, day out. It makes the ground wet and muddy with liquid methane. This is why the Huygens probe landed with a splat. It landed in methane mud.”

“We determined that the rain on Titan is equal to about two inches (about 5 centimeters) a year. This is about as much rain as Death Valley (receives). The difference is (that) on Titan, this rain is spread out evenly over the entire year”

I don’t have access to a Nature subscription, (a personal one is $200/year) but the Editor’s Summary is free.