The atmosphere on Mars is extremely thin. The atmosphere — what little there is of it — is about 95 percent carbon dioxide. The average atmospheric pressure on Mars is around 7.5 millibars, is compared to 1013 millibars on earth. When the Curiosity rover landed in the Gale Crater in August 2012, it was in the midst of Mars’ version of a high pressure system, with the barometer on the rover measuring 9 millibars.
Harmful radiation also bombards the planet. Because of these factors, Martian weather is vastly different from ours and no human can exist on it without a proper space suit or a tightly controlled environmental habitat.
https://www.washingtonpost.com/blogs/capital-weather-gang/wp/2015/10/18/the-weather-on-mars-is-both-totally-alien-and-somewhat-earth-like-all-at-once/
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