The figure above graphs the 3-day NWS forecast for McDonald Observatory. The top panel shows predicitons of Relative Humidity (RH) percentage, Sky Cover percentage (how much of the sky will be covered in clouds) and Precipitation Chance. The middle panel shows the predicted temperature in F and the lower panel shows the predicted wind speed and wind gusts. These are, of course, forecasts, so take them with a grain (or more) of salt.