Neptune has a fairly constant temperature of 72 degrees Kelvin. 200 c
-868 degrees Fahrenheit
Technically speaking, Neptune is the planet with the lowest surface temperature; however, Neptune does not have a solid surface.
The lowest surface temperature is Jupiter. 
Farthest from Sun
Neptune(If you include dwarf planets it is Eris)
Neptune
Technically speaking, Neptune is the planet with the lowest surface temperature; however, Neptune does not have a solid surface.
The lowest surface temperature is Jupiter. 
Farthest from Sun
Neptune(If you include dwarf planets it is Eris)
Neptune's moon Triton has the lowest recorded temperature of any moon.
The moon that is the farthest from the Sun. Triton, a moon of Neptune, has the lowest temperature so far measured.
Neptune
The average temperature of Neptune is -200 degrees Celsius
The surface temperature on Neptune is very very cold. it is - 391 F.
Neptune has a temperature of 330.1 degrees... :L
Pluto is not the lowest temperature. The lowest temperature possible is −273.15°C. Pluto's coldest temperature is about −233°C.
jupiter highest and lowest temperature