The temperature is very low. The air is very thin, a human could not survive. This is also the bottom of the 'ozone layer'. The ozone Layer Ozone is just a form of oxygen. Normally, we find oxygen as two oxygen atoms bonded together.
Ozone is three oxygen atoms bonded together.
At this height you find the largest concentration of ozone. The temperature has gone up slightly from STEP 2, as the ozone absorbs sunlight and converts this to 'heat'. Ozone Hole, discovered from observations at a British Antarctic base. We are still in the ozone layer. The temperature has increased by a large amount from the step below, due to the absorption of solar ultra-violet light by ozone.