If the weather's not playing nicely, why not spend some time at Puyang Museum? You'll be fascinated by just how much you can learn about the past here.
This Hualong District collection of historical artifacts is a good place to begin your day of sightseeing. There's plenty to explore nearby, like Qicheng Ruins and Hui Luan Monument. Wander around at your leisure at Puyang Museum before hitting up these other fine sights.