This week in 1971, Apollo 15 became the first mission to use the Lunar Roving Vehicle. via NASA http://www.nasa.gov/centers/marshall/history/this-week-in-nasa-history-first-use-of-the-lunar-roving-vehicle-july-31.html
With a high of 81F and a low of 60F. Current temp 73 Current condition Partly Cloudy. Sunrise at July 31, 2019 at 06:23AM sunset at July 31, 2019 at 08:42PM. Humidity 47%.