Even if you Don't Want To... Get out and Photograph
The hardest part about landscape photography, at least I think, is getting up early. Its even harder to wake up when you look out the window and see gray overcast clouds everywhere thinking you wont get a good image.
But, its important to force yourself up out of bed anyway and walk out into the cold. All looks terrible when suddenly the sun comes through the clouds, creating beautiful contrast in the landscape, the dark clouds with glorious light bursting through.
Just because the day looks gloomy in the morning doesn't mean its going to stay that way. Amazing images happen unexpectedly and in the end, photography is (to a degree) a numbers game.