If their bin is too wet or too dry, the worms will become restless. You don't even want to think about dealing with a herd of stampeding worms. Cattle and worms also don't like weather extremes. If it is too cold neither species wants to eat. They just want to stay warm.
Cattle get out of the wind.
Usually the worms will gather in a clump or wriggling mass to retain warmth. Worms work within a temperature range of 40F to 90F degrees. Like people, they prefer a constant temperature around 70F degrees. The worm bin I am working with now is larger than the models present in many classrooms. The worms are not particular about where they live as long as they get food, air and water.