Do Seasonal Temperatures Exist on Saturn?

Saturn's surface temperature stays basically the same throughout its year.
••• Stockbyte/Stockbyte/Getty Images

Earth's 23.4-degree axial tilt has a profound effect on climate, and with a tilt of 26.75 degrees, Saturn should experience similar climatic effects, but it doesn't. Instead of seasonal temperature variations and temperature differences between the poles, such as those that exist on Earth, Saturn's surface temperature changes little with latitude and from season to season. The reason is that most of Saturn's warmth comes from inside -- not from the sun.

Colors of the Seasons

Saturn takes 29.45 Earth years to orbit the sun, making each of its seasons last a little longer than seven years. As each of its poles tilts away from the sun, and winter descends on that hemisphere, the atmosphere takes on a bluish tinge that NASA scientists think is ultraviolet sunlight reacting with stratospheric methane. At the same time, the bluish color gradually fades from the opposite hemisphere. These color variations, recorded in detail by the Cassini orbiter, can give the impression of seasonal temperature variations on the surface, but that impression is misleading.

Saturn's Surface Temperature

Saturn is a gaseous world and doesn't have a surface, but at the top level of its clouds, the temperature remains a steady minus 178 degrees Celsius (minus 288 degrees Fahrenheit) throughout the year. Horizontal variations exist, owing to high winds that blow at speeds as fast as 1,800 kilometers per hour (1,118 miles per hour), but the temperature varies little with latitude. In 2004, however, astronomers at the Keck Observatory in Hawaii discovered a vortex at the tip of the south pole with a temperature in the range of minus 122 degrees Celsius (minus 188 degrees Fahrenheit).

Internal Heat Generation

Saturn radiates more than twice the energy it receives from the sun, which is the most of any planet in the solar system. Part of this comes from the heat generated at its core, where compressive forces generate temperatures around 11,700 degrees Celsius (21,000 degrees Fahrenheit). Saturn generates more heat than Jupiter, because it has cooled enough to allow helium to condense and rain out of its upper atmosphere. The helium droplets generate frictional heat as they fall through the hydrogen atmosphere. This phenomenon is responsible for the near-uniform temperatures on the planet's surface and the lack of seasonal differences.

Causes of Temperature Variations

Saturn's polar hot spot is a phenomenon peculiar to that world. Earth, Jupiter, Venus and Mars all have polar vortices, but they are colder than their surroundings. Scientists aren't sure what causes it, but one suggestion is that particulate matter in the upper atmosphere traps ultraviolet sunlight, which would make the hot spot seasonal. This theory doesn't explain the concentration of the particles at the poles, however. Another possible influence on Saturn's surface temperature is a rain of charged water droplets from its rings. These interact with the ionosphere and cause shadows to form at specific latitudes.

Related Articles

Saturn's Temperature Ranges
How Does Latitude Affect Climate?
What Is the Wind Speed on Neptune?
10 Interesting Facts About Saturn
Facts About the Planet Neptune
Which Planets Have No Seasons?
What Is the Average Temperature of Jupiter?
Weather Facts About Saturn
What Is the Order of the Planets From Hottest to Coldest?
Does Mars Have a Greenhouse Effect?
Geology Facts on Neptune
What Is the Weather on Other Planets?
What Layer of the Atmosphere Is of the Greatest Interest...
Rain Clouds Vs. Snow Clouds
What Are the Planets in Our Solar System Held in Their...
What Planet Radiates More Energy Into Space?
What Is the Earth's Atmosphere Composition & Temperature?
List of 10 Short Facts About Neptune
Two Types of Planetary Motion
Does Pluto Have Storms?

Dont Go!

We Have More Great Sciencing Articles!