People that love rain are called pluviophiles. The word pluviophile comes from the Latin word “pluvial,” which means rain, and “phile,” which denotes a thing or a person. Therefore, a pluviophile is a lover of rain, or someone that finds joy and peace of mind during the rainy days.
A spurious Latin-Greek formation coined by the Greekless which attempts to express love for rain but in fact manages to express both pretentiousness and ignorance, the proper Greek formation being "ombrophile,' with ὄμβρος meaning long rain.
(Note: A psekaphile would be one who likes drizzling rain, and an hyetophile one who likes the rain in general.)
Pretentious Jerk: "He's a real pluviophile. He would be happy in Vancouver."
Jerk: "Why, you're no Classicist! It's ombrophile! Gostudy Greek!"
A person who loves the planetPluto and feels all of life is diminished without it being the 9th planet of the solar system.
The Plutophile pleaded that New Horizons in 2015 proved Pluto has a heart, and it will remain broken until its status as a full planet is rightfully restored.