Richard Schad has been keeping weather records in Ellicott City since 2004. "I see day after day of mild-to-warm temperatures for nearly every year for December and January. How has the daily average temperature changed over the last 5 to 10 years ... at BWI?" Ditch the fur hat. It has trended generally milder. Six of the past 10 Decembers and eight of the past 10 Januaries, have surpassed the 30-year averages. You can graph the long-term change and see for yourself at baltimoresun.com/climate