The surface temperature of Venus varies from about 462 degrees Celsius (864 degrees Fahrenheit) across the planet. Venus has a thick atmosphere made primarily of carbon dioxide, with clouds of sulfuric acid, contributing to a runaway greenhouse effect that traps heat. This extreme temperature is consistent all over the planet, day and night, making it the hottest planet in our solar system. In addition to its high temperatures, the atmospheric pressure on Venus is about 92 times that of Earth, which adds to the challenges of exploring the planet.