From Harold Brooks at the US Severe Weather Blog:
There were no tornadoes reported in the United States in February 2010. Assuming that no late reports are received, it will be the first time in the National Weather Service’s database that starts in 1950 that there has been a February without a tornado. If we include Tom Grazulis’s database of F2 and stronger tornadoes, the last time it’s possible there wasn’t a February tornado was 1947. The last tornado reported in the US was on 24 January, in north-central Tennessee. The last calendar month without a tornado was January 2003.
He goes on to say that this tells us nothing about what is in store for the US this spring and summer during tornado season.
January, however, saw some tornadic activity, the strangest being tornadoes that occurred in California near the end of that month. But the fact that there were no tornadoes in February is not surprising given how nasty this winter has been in the US. According to the Omaha World Herald, Omaha has had snow on the ground for a record 84 days and counting and Nebraska has been hit with 4 blizzards (they average 1 every 5 to 10 years). Iowa has seen 3. Snow storms have seemingly been the norm this month from the Canadian border all the way down to Texas and the southeast United States. So while there hasn't been any spring-type severe weather in February, the winter has been severe in other ways.