what makes is electricity inside a cloud. Scientists do not know exactly loud can be this electricity. But they know that the elec inside electricity, a as much as ioo million volts. From this extremely strong lightning bolt, like a streak of bright light, comes down the sky. Its temperature can reach 50,000 degrees Fahrenheit within a few millionths of a second. That's almost five times the temperature on the sun's surface. The lightning bolt is very quick. It move at a speed of 87,000 miles per second. A rocket traveling at this speed would reach the moon in 2.5 seconds. With the lightning bolt, usually hear thunder, which is the sound of hot air exploding Lightning and thunder happen at exactly the same time, but we see lightning first because light travels a million times faster than sound.