Final answer:
The best statement for describing the climate of an area is one that refers to long-term averages, such as the average yearly rainfall, rather than specific weather events.
Step-by-step explanation:
The statement that best describes the climate of an area is "C. The average yearly rainfall in Nevada is approximately 23 cm."
Climate refers to the long-term, predictable atmospheric conditions of a specific area including consistent seasonal temperature and precipitation ranges. Statement C describes the average yearly rainfall, which is a climate indicator, as opposed to statements A, B, and D, which refer to specific short-term weather conditions.