Oberon and Titania are fighting and because of this, the weather and climate are affected. The weather is volatile and tumultuous, just like Oberon and Titania's relationship at this point. When they fight with each other, it disrupts nature's natural rhythm and causes discontent in the natural world. This, in turn, also affects the "city world." Once Oberon casts a spell on Titania (when she falls in love with Bottom) and after he has seen enough of her doting on Bottom, he decides to release the spell. Afterwards, Titania gives the child to Oberon and due to Titania and Oberon's reconciliation, the natural world returns to its harmonious state again.