Nine U.S. states have reported record increases in COVID-19 cases over the last seven days, mostly in the upper Midwest and West where chilly weather is forcing more activities indoors. On Saturday alone, four states - Kentucky, Minnesota, Montana and Wisconsin - saw record increases in new cases and nationally nearly 49,000 new infections were reported, the highest for a Saturday in seven weeks, according to a Reuters analysis. … Health experts have long warned that colder temperatures driving people inside could promote the spread of the virus. Daytime highs in the upper Midwest are now in the 50s Fahrenheit (10 Celsius).