Update: Tuesday, 8:30 a.m. \u2014 Schools opened on time in Wilton this morning despite the coldest temperatures in years. Schools in Fairfield County opened on schedule although a few districts \u2014 Somers, Coventry, West Hartford, and Windsor \u2014 opted for 90-minute to two-hour delays. CL&P reports few outages in this area, although more than 600 customers are without power in the Hartford area. Metro-North reports good service on the branch lines, although there are weather-related delays of up to 20 minutes on the New Haven line westbound between Bridgeport and Stamford. The Iowa Department of Health developed a chart to help parents and school officials make informed decisions about safety and outside play in a variety of weather conditions. According to that chart, and temperatures (real or wind chill) at 10 degrees or less are considered dangerous for children. Here is the Iowa Child Care Weather Watch chart. Monday, 4:45 p.m. \u2014 The National Weather Service has issued a wind chill advisory this afternoon that will remain in effect from midnight tonight through 6 p.m. Tuesday, Jan. 7. As morning fog and heavy rains gave way to clearing skies, temperatures have taken a tumble. Wind chills as low as 15 below are expected as winds from the west of 20 to 35 mph are expected. Gusts of 40 mph to 50 mph are possible. Temperatures will drop into the single digits tonight with a slight chance of snow showers after 10. Skies will be partly cloudy. Tuesday will be mostly sunny, but the high will only be near 11. A west wind of 21 to 25 mph will make it feel as cold as -15. Gusts of 39 mph are possible. Prolonged exposure to the bitter cold and wind could lead to frostbite and hypothermia. There will only be minor relief on Wednesday, when it will be sunny and the high is near 21. The wind will slow down to around 11 mph. The first chance of breaking the freezing mark will be Thursday, when it will be partly sunny with a high near 33. Our next chance of snow comes Friday, but right now the weather service pegs the chance of snow at only 30%.