No, this isn't a reference to that slovenly liberal 'film-maker's' trash piece, or the Bradbury novel of the same name. Said filmmaker should be shot for appropriating the title of such a great work. Interesting though that he ripped off the title of a science-fiction story; it kind of puts his work in a new light when you think about that.
No, this is a reference to the gorgeous day outside. Yesterday was gray, foggy, dreary, and filled with snow. Large, slow-falling snowflakes were the order of the day. Not today though, at 51.8 degrees, the snow is melting like mad, the streets are dry, and the sky is crystal clear.
The sun seems a little extra bright today; and it's warm enough to go without a jacket. At least for me, that is; though I usually go without a jacket unless it's so bone-chillingly cold that one could mistake the ambient air temperature for that of Pluto.
It's just one of those days where being outside just makes you glad to be alive.