The White House coronavirus task force warned that much of the country is in the grips of an “unrelenting” surge in Covid-19 cases and urged tough countermeasures, as the reported number of U.S. infections hit a new daily record of more than 91,000.

The United States broke the country’s daily record for new coronavirus infections with a reported 84,218 new cases due to outbreaks in virtually every part of the country, according to a Reuters tally.

Wisconsin and other states in the U.S. Midwest and beyond are battling surges in Covid-19 cases, with new infections and hospitalizations rising to record levels in an ominous sign of a nationwide resurgence as temperatures get colder.

U.S. cases of the novel coronavirus crossed 8 million, rising by 1 million in less than a month, as another surge in cases hits the nation at the onset of cooler weather.

Nine U.S. states 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.

A new study published in Scientific Reports found Noom Coach users who lived in colder temperatures were most successful at losing weight.