There are 4 season cycles, Winter, Autumn, Summer and Spring. These are signified by the color of the trees. They also signify the specific Natural Disasters.
Winter - Trees turn white and are inedible, the water has a chance of freezing. When frozen, the player may left click on the ice multiple times and a light blue blob/circle will appear, allowing the player to drink water. Ferns are almost inaccessible.
Summer - Trees turn green and droughts may occur, in which rivers and lakes dry up almost completely. During Summer, herbivores and omnivores may eat leaves from the trees by left clicking, given that they can reach. Ferns are common.
Autumn= Trees turn yellow/orange and are enedible, flooding occurs, level and length of the flood differs. After a flood, fog appears, limiting the player's sight. Ferns are rare.
Spring= Trees turn pink and flooding occurs, level differs. After a flood, fog appears, limiting the player's sight. During Spring, like Summer, herbivores and omnivores may eat leaves from the trees. Ferns appear in large numbers across the map.