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 %.
Given its exposed location, it can get quite hot in Machu Picchu, and at its elevation, the sun is strong -- do not forget your sunscreen! The dry season is the best time to travel to Machu Picchu -- and not surprisingly, coincides with the high season. To avoid the crowds, consider traveling in late April, May, June, or early October. Crowds are the heaviest during July and August.