1 Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components.  A chemical substance is composed of one type of atom or molecule.
February (Inca Trail Closed) 1  Overview: Another wet month, and not the best time to visit to Machu Picchu. 2  Temperature: Daytime average highs are around 20 degree C (68F) and night time average lows around 8C (46F) 3  Humidity: Average daily relative humidity is around 66 %.
January will be in the midst of the rainy season, but many tourists happily visit Machu Picchu during that time. Last year, the area near Machu Picchu had devastating flooding in late January (rail lines were torn out by floodwaters, cutting off access to MP). But this was an extremely rare occurrence, unlikely to happen two years in a row.