(Radio Iowa) – The kids may hate it, but Iowa parents could lay down the law that they’ll have to wear a coat over their costumes if they’re trick-or-treating tonight (Monday) or tomorrow night. Temperatures across the state are expected to dip some 20 degrees colder than normal, while wind chill factors may drop into the teens, according to meteorologist Rod Donavon at the National Weather Service. “While it’s going to be sunny today, we are expecting temperatures to remain pretty cold with highs in the 30s,” Donavon says. “That will be dropping off pretty quickly as we get into trick-or-treat time this evening, with temperatures dropping off in the 30s pretty quickly, and if anybody is out there beyond seven o’clock, you’d see some 20s out there.”

Some Iowa cities hold their trick-or-treating on Halloween, and Donavon says it may be even colder tomorrow night, as a system is approaching. “We are expecting a little bit more wind, which could add a little bit to the chill factor,” Donavon says. “High temperatures, we’re still looking generally in the 30s but as we drop into trick-or-treat time, we will be having temperatures in the 20s and 30s, and we will be looking at that wind basically in the 10-20 mile per hour range. It could drop some wind chills into the teens.”

Parts of Iowa had snow over the weekend, and Donavon says we’re nearly done with that, at least for now. “We did have some areas up across northwest Iowa that did have one-to-three inches of snowfall,” Donavon says. “With that, we did see some flurries across central Iowa this morning, but overall, generally dry conditions outside. We do have a chance of snow showers across far northeast Iowa later tonight into Tuesday morning, but otherwise mostly dry.”

The forecast calls for high temperatures back to near-normal in the low 50s by Friday.