Jean-Jacques Rochat spent a few days skiing near his chalet in Ovronnaz, Switzerland. Even though he is no longer a science teacher (now a principal), he could not resist collecting data. Here is a photo and a day’s data from a temperature probe and a barometer, used to calculate approximate altitude. Note that you can see each run, his (short) waits in lift lines, and his visit to the store. The altitude data nicely matches the labeled altitudes of the tops of the chair lifts.