All seasons should be implemented into a map instead of generating a map for a specific season.
-No outdoor flora, farming or agriculture. It must be done indoors (greenhouse) during that time.
-No leaves on trees
-Blizzards could occur giving 0 visibility and damage your heatlh one hearth per minute if not indoors.
-Flooding from melting snow
-High winds/tornadoes that could do damage to the terrain including your house