Space is nothing, it is the lack of matter, it doesn't have a speed, it doesn't have a temperature, it does have a smell or a taste... it is nothing, it's empty space.
I would call it current speed, not average speed.
18,000 mph
The average orbital speed is 17.882 km/s of asteroid in space
1 m-p-s
1700 mph
17,500 mph
It's average speed is 27,743.8 km/h.
Current scientific belief is that the maximum speed any object can achieve is the speed of light.
This will depend not only upon the strength of the current (in Amperes), but also on the wire's cross-section. In any case, in a typical current, the electrons have an average speed of a tiny fraction of a milliter per second.
The average speed of the International Space Station is 17,221 miles per hour. It completes an orbit every 91.48 minutes at an average altitude of 222.3 miles.
There are three different speeds here.The average speed of electrons - whether there is a current or not - is a significant fraction of the speed of light. That speed depends on the temperature. (The average VELOCITY of course is zero if there is no current, since as many electrons will go in one direction as in another.) The drift velocity (the average velocity) of the electrons is a small fraction of a millimeter per second. The exact value depends on the current, the cross section, and the material. The speed at which a signal can propagate in copper is about 2/3 of the speed of light in a vacuum - so, about 200,000 km/second. It is this speed that makes your light react quickly when you activate a switch.
Instantaneous speed is the speed of a body at any one instant. There is really no such thing as the instantaneous speed, it is merely the average speed over a very short space of time.