Summer puts rare droughts and forest fires into the game. Winter puts blizzards (snow blocks spawn) and floods (water spawns in valleys randomly). Spring adds faster crop growth, animal spawning (excluding hostile mobs), makes grass and other plants grow faster, etc. Autumn makes leaves change colors, and when it gets to the transition of autumn and winter, the leaves will disappear. In certain seasons, animals migrate. If anyone makes a mod that somewhat resembles the ideas stated in this topic, then please reply to this post or send me a message with information about the mod and/or tell me where to view it and download it.