Purists say they don't edit their photographs at all and they don't have to if the right camera settings were used. I'm fine with that philosophy if cheap old low-end cameras are used and they only can shoot in JPEG mode. Otherwise this approach is a complete waste of money on expensive cameras.
Weather conditions aren’t always perfect when shooting landscape photography; let's be honest they are usually not ideal. One way to turn poor weather into something special is by using a 10-stop neutral density filter which allows you to take very long exposures during the day resulting in some unique images.