Precipitation is distributed fairly evenly over all months of the year, and mostly originates from a westerly airflow. There is, however, significant variation in precipitation with altitude. For example, Chamonix has an elevation of approximately and receives around of annual precipitation, whilst the Col du Midi, which is at above sea level, receives significantly more, totalling . However, at an even higher altitude (near to the summit of Mont Blanc) precipitation is considerably less, with only around recorded, despite the latter measurements being taken at a height of .: