Hot and cold are comparative terms.
It is colder on Jupiter's surface than it is on Earth's surface, by mean.
Wikipedia gives the mean surface temperature as 112-165 K, which translates to about -108 Celsius and lower (consider +21 Celsius is recognized as standard room temperature on earth). The coldest temperatures ever verified on earth seem to rank at around -90 Celsius in what are essentially uninhabitable areas.
An important realization is that, due to many factors, Earth's temperature is extremely consistent. A mean temperature hides the fact that other planets undergo 'daily' cycles that range in temperature by hundreds of Celsius.
If that happened on Earth, we wouldn't last very long.
Caveats to this question/answer include: Fluctuations of temperature according to location on Jupiter/Earth, where Jupiter/Earth is in its orbit, where you even define 'surface' to be on a gas giant, etc etc.
Small & cold.
The exoplanets called "Hot Jupiters."
As with any planet, the interior of Jupiter is quite hot, but at the level in its atmosphere where pressure is similar to what we find on Earth it is actually quite cold.
Neptune is thirty times farther from the Sun than we are, and is so far away that the Sun just looks like a star, so as you can imagine the upper atmosphere is freezing cold - just -225 degrees Celsius! This is extremely cold. However, inside Neptune it is hot - very hot - and reaches tens of thousands of degrees, hotter than the surface of the Sun! This immense difference between Neptune's bitterly cold upper atmosphere and seething hot core causes huge convection currents to flow through the planet, stirring its air and causing Neptune to have the fastest winds in the solar system.
100 oC is the boiling point of water at 1 atmosphere pressure.
Small & cold.
It is not necessarily cold above the atmosphere. In direct sunlight, it can be quite hot.
very cold
Nope. Jupiter's atmosphere contains hydrogen and helium.
very cold
the atmosphere of Jupiter is made of 90% hydrogen, and 10% helium
Jupiters upper atmosphere is mainly carbon dioxide and nitrous oxide below that is a layer of condensed hydrogen or a sea of hydrogen because of the immense pressure in the atmosphere
It gets hot and cold. Hot because there is no atmosphere so the sun's rays get in much easily. Cold because there is not atmosphere to trap the heat and don't forget the moon rotates so it still has day and night.
jupiters atmosphere is made up of hydrogen, helium, amonia, and many other gases.
It doesn't have an atmosphere to regulate the temperature.
The outside layers of the atmosphere are very cold, as they get little heat from the Sun. The surface is unreachable beneath the hot, extremely dense lower atmosphere.
Models suggest that the clouds on hot Jupiters could be composed of minerals like corundum and silicates, as well as exotic compounds such as titanium oxide and aluminum oxide. These clouds may form due to strong winds, vertical mixing, and high temperatures in the atmospheres of hot Jupiters.