The one unique fact about the subtropical areas is about the climate. You can see the regions are experiencing cold climates during winter. And also during summer, they are often experienced with mild heat. However as they are away from tropical regions, the climate condition will be moderate or mild.The temperatures in summer can go up to 80 degrees Fahrenheit and during winters the maximum temperature can be up to 50 degrees Fahrenheit. So from this data itself, students can easily assume that the largest part of sunlight falls into this area. And this does come directly under Koppen's classification of climate. Although we name it as humid subtropicals, the humid climate is experienced near 20 degree and 40-degree latitudes.