Many different gases make up the layers of the atmosphere, the majority being nitrogen and oxygen. These gases let rays from the sun reach the surface of the Earth and allow heat reflected off the surface of the Earth into the atmosphere.he Greenhouse Effect is the effect of greenhouse gases in the Earthâs atmosphere trapping heat that is released from the Earth. The Enhanced Greenhouse Effect is the increase of greenhouse gases in the atmosphere resulting in more heat being trapped and so warming the surface of the Earth.
Weather in Montreal in September. Montreal temperatures in September range from 10 to 22 and there is an average of 18 days of rain. Weather Facts - Montreal in September. * The warmest temperature recorded in in September is 34Â°C. * The coldest temperature recorded in Montreal in September is (-3Â°C) * The average rainfall in Montreal in September is 91 mm. Yearly Average for Montreal. Max Temp.
Montreal May Weather: What to Wear Anticipate storing winter duds away and showing a bit of skin. May is clement and pleasant though chilly in the evening, especially the first half of the month.