The abundance of rattlesnakes in all of eastern Montana ... U.S.: my official Montana Tech station from 1986 to 1989 recorded NO months without at least one freezing temperature.

(SOUNDBITE OF SONG, "SNAKES IN THE GRASS") DOLLY PARTON: (Singing) And they won't let you go. No, they're creepy, they're cold. So beware of the snakes in the grass - snakes in the grass.