And not only do we have weather radar, but we also have radarscopes for planes to depict the weather. If you are up in the tower, you can see the weather moving in, see the lightning coming. Really bad weather is usually not a good thing because it's hard work on the pilots. Normally, there are just a couple spots without the bad weather and everyone wants to go there. Sometimes the pilots don't want to be where they are asked to go.
Clear weather is more mundane.
I kind of like mediocre weather because it's a challenge, but not too much. Depending on the severity of the weather, it's not harder work, but it's different. You need to make sure not to leave anything out. For example, you must make sure the pilot knows how far he can see down the runway, how long he has to brake. There are different procedures for different phenomena, such as icing in the air versus icing on the ground.