What are the features that make winter, winter? What about summer? Depending on where you live, the seasons can be very distinct and the differences between them are often discussed with the earliest readers. In this book, readers meet a cute, blue monster named Mo and investigate all the main features of the season--plus more science content! From the position of the sun to the water cycle, important curriculum concepts are interspersed in an illustrated story about Mo and friends having fun all year long.