Thursday, March 31, 2011

Roraima: Always On Cloud Nine

Dramatic clouds, heavy rains, and misty fog combine to create a climatic environment unlike anywhere else on Earth. Adiabatic cooling on Mount Roraima causes the formation of cirrostratus clouds and frequent rain. As moist air rises and multiplies, it cools and allows for the production of these specific clouds. The adiabatic process claims sole responsibility for the extraordinary cloud formations and numerous rain showers. Roraima's moist air rises, swells, and cools as it reaches the dew point. The ground gives birth to an eerie radiation fog when the rain ceases to fall.

High clouds and fog engulf the mountain top. Photo from

The mist sets in on Roraima. Photo from

Roraima has an equatorial and tropical climate type. Average temperatures are 24 degrees Celsius to 26 degrees Celsius. On the summit, temperatures can drop as low as 4 or 5 degrees Celsius. On account of the large amount of moisture existing in the air, humidity levels can reach a staggering 90%. Humidity, rain, and fog cause a physical struggle for the hiker. Proper gear is paramount if you desire to climb this mountain.

The steady rainfall makes for a much more arduous hike. Photo from


  1. This is an incredible place! We love it. The pictures obviously don't do it justice but puts into perspective how amazing this area of the world is! The pictures make it look like a fantasy world! Maybe you could embed a video of a group of climbers trying to reach the summit and looking down from the top. That would be awesome!

  2. Great Blog, i liked how you described the clouds and valley fog. and the pictures are spectacular. It would have been nice if you explained the climate a little bit more, how and why it has the temperature it gets since that was a big part of the last section. Really like the place thou.