A collection of simultaneous meteorological measurements taken and recorded in a mountainous location. The harshness of the high-mountain environment, the inaccessibility of sites, and the remoteness of these regions are special problems that have limited the availability of long-term records of mountain weather. These difficulties are compounded by the issue of representativeness of a measurement. Over flatter, simpler terrain, care is taken to place instrumentation in exposed locations where the measurement can be considered as representing a larger area. Barry (1992) defines at least three types of situations in the mountains: “summit, slope, and valley bottom apart from considerations of slope orientation; slope angle; topographic screening; and irregularities of small-scale relief. ” Thus it is very difficult; perhaps inappropriate; to claim representativeness for a single observation; and one must interpret mountain observations with great caution. Barry further states; “These factors necessitate either a very dense network of stations or some other approach to determining mountain climate. In the future; the use of ground-based and satellite remote sensors combined with intensive case studies of particular phenomena; may provide the best solution. ”