Thunder Snow. Weather Gods, #1.5

Freya thought that moving inland for university would mean safety. She was wrong. Despite taking her cat with her when she moved for university, Freya is lonely. Her need for friendship leads her to join a group on a night out. But can her new acquaintances be trusted? An out-of-season snowstorm descends on the city. The night streets are haunted by fierce black dogs. There's a freak accident in the climbing gym.
And not all of her new friends are what they seem. When a descendant of Apollo attacks the group with crows and arrows, Freya is horrified. But when it turns out he's on a vendetta to get rid of weres, Freya isn't sure what to think. Then, one of the group is reported missing. Deep in the underground rivers of Sheffield, Freya and her friends must find and neutralise the kidnapper, or they may not survive until their term exams.