I WONDER - How Hot It Is On Mars?

Mars, despite its warm color, is quite cold due to its thin atmosphere. This atmosphere doesn't retain much heat, leading to significant temperature variations. In summer, temperatures can reach 20 degrees Celsius, but in winter, they can plummet to minus 100 degrees Celsius.

What is the reason for Mars's inability to hold heat?

What is the maximum temperature Mars can reach in degrees Celsius?