What are the best meteorological conditions for manned space launch? why

The best meteorological conditions for manned space launch mainly include: no precipitation, ground wind speed less than 8 meters per second, and horizontal visibility more than 20 kilometers; From 8 hours before launch to 1 hour after launch, there is no lightning activity within 30 km to 40 km of the site; The maximum wind speed in the airspace from 3 km to 18 km from the launch site of the ship and arrow is less than 70 meters per second. In addition, there should be no lightning for 9 hours before and after launch.