Writing the letter to a farmer may take thirty to forty five minutes. Heat makes water evaporate more quickly since water molecules move faster when they are warm. Since the molecules are moving faster, more of them can leave the surface of the water at one time. Warm air can hold more water vapor than cool air. This is because there is more space in the air for water molecules.
Wind also helps water evaporate more quickly.
It blows away moist air at the interface of water surface and air making room for more water molecules. Wind on Colorado's eastern plains often dries out the soil quickly. In Colorado, because of our semi-arid climate, evaporation happens very quickly. Evaporation is a cooling process. That is why we sweat and why breezes off of bodies of water are cool.