Temperatures well above the historical average from the winter through early spring may have offered some comfort to consumers through lower heating bills. However, AccuWeather meteorologists say there are some concerns the warmth will raise the risk of damaging frosts and freezes in the Midwest and Northeast before the end of April. Temperatures since Dec. 1 have averaged 6-8 degrees Fahrenheit above the historical levels in the Midwest while most locations in the Northeast have been 3-6 degree