Random selection of weather for Dead Air 0.98b addon

This algorithm was written a long time ago, I expected that only me and a couple of "friends" would have this script, however... now it is in the public domain. In fact, there is nothing special here: as the name already implies, the weather for the location is chosen randomly, however, there is a configurator that determines for what period and with what probability this or that weather will fall on the location. In addition, after changing from one period to another, the weather database will be updated, so you will have an unlikely repetition of the same weather.