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 %.
If you don't mind getting wet, visit during Cusco's summer season for unbeatable hotel prices and fewer tourists. But beware: If you have the intent of trekking to Machu Picchu, the Inca Trail closes during the month of February for maintenance. Also, heavy summer rains leave the trail muddy and difficult to hike.