Today’s second glitch:
Change Its to It’s.
Change the comma after today to a period. (Actually, you can just delete today — it isn’t needed — and place the period after day.)
Unless you mean to say there’s more than one sun (could be fun, right?), change suns to sun’s (contraction of sun is). If there is more than one sun, change suns it to suns are.
Change towns to town’s.
At the end, change there to they’re.
It’s a lovely day. The sun’s on fire. Your house is on fire. The town’s on fire. The only thing not on fire is the snow. You thought it’d be a nice thing to do, since it’s so cold. The townspeople appreciate it, because they’re on fire.