Answer:
Regions near rivers experience winds from the water that prevent extreme temperature changes.
Step-by-step explanation:
The big bodies of water have a cooling effect on the environment during the summer, but in the winter it helps to keep the warmth. This is especially true for the rivers as they experience winds that affect the climate. The temperature of the river does not change too drastically, and neither does climate around the river valley.
Therefore, the regions that surround the river banks often are affected by the winds and these cooling effects during the summer, and therefore do not have such drastic temperature changes even when the weather is hot.