The warmer-than-usual temperatures in Wisconsin this month are of historic proportions.
Record keepers say it's the warmest start to a year since 1880.
UW- Madison research meteorologist Scott Bachmeier says it's pretty amazing given the magnitude of how much warmer it is compared to normal.
An entrenched jet stream is causing the moderate temperatures. Meteorologists say it's trapped Arctic air north of the United States and has been in place since December 22nd.
Bachmeier says computer models suggest a change coming in mid-February, when some of that Arctic air could move south into Wisconsin.