Because Venus has an axial tilt of only 2.7 degrees, it lacks the seasons found on both Earth and Mars. Venus also has a very thick atmosphere and suffers from a runaway greenhouse effect, meaning that the surface of the planet experiences no temperature variations whatsoever.
Seasonal changes are the result of the angle at which a planet spins upon its axis. Warmer summer temperatures are experienced by a hemisphere that is tilted toward the sun, while the opposite hemisphere can expect cooler winter temperatures. While the planet Venus is similar to Earth in many respects, its axis is tilted at a much narrower angle.
Venus has an atmosphere that is 93 times thicker than Earth's. Due to its density and the presence of high quantities of carbon dioxide, the greenhouse effect of the atmosphere traps a great deal of heat from the sun and distributes it around the surface of Venus. Temperatures on the surface of Venus average 860 degrees Fahrenheit, regardless of location. Venus rotates much more slowly than Earth, and some areas of the planet may be without direct sunlight for up to 50 Earth-days. Even the difference between the long day and night of the planet is unable to change surface temperatures.