This is just some information on where they're located and some assets.

FORT

Fort was the first Weyr founded. It's high in the mountains of the west, as all Weyrs are, and has a moderate climate.

BENDEN

The second Weyr and in the East, Benden is more North than Fort and therefore slightly colder.

HIGH REACHES

Far in the North and West, High Reaches has rather cold weather and harsher winds.

IGEN

Igen is in the mid south of the Northern Continent, very warm and temperate for dragons.

ISTA

Residing on a large island in the south of the north, Ista is known for it's scorching temperatures.

TELGAR

Also high in the north, Telgar can get quite cold at times.

SOUTHERN

The only of the Seven Weyrs on the Southern Continent, Southern is steaming hot. Sick and/or injured riders from other Weyrs are often sent here to heal.