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Nevada as a state can be visited year round, but different regions of the state have different weather patterns.
In general, the weather is hotter in the southern regions of the state. Las Vegas for example, is very hot in the summer months of July and August, during which time the daytime temperatures will reach into the 100’s - with some days as high as 110F°. May and June are the perfect months, temps in the low 90's and dry. July is hot, and August starts the monsoon season with frequent days of clouds and even rain - flash flood warnings are common. February and March are known for their winds. December and January are downright cold with overnight temps in the 40's and daytime highs in the high 50's. (F).
On the other hand, the high temperatures in the summer months in city of Wells (located in Northeastern Nevada) will reach only the upper 80’s.
Then there are the Mountains, more specifically the Sierra Nevada’s, which butt up the Western side of the state. Reno, which is on the western side of Nevada near Lake Tahoe, has summertime temperatures that reach the lower 90’s on average.
As far as precipitation is concerned, Nevada is the driest state in all of the US. On average, with measurements taken throughout the state as a whole, less than eight inches of rain fall in an entire calendar year. This is less rain than falls in certain states in a single month. The general landscape is very arid and desert like.