WETHERSFIELD — Employment stagnation attributed to the harsh winter weather seems to have experienced a seasonal thaw, with the state adding 4,900 non-farm positions in March, according to preliminary statistics from the state Department of Labor’s Office of Research. That’s a 0.3-percent increase in jobs over February. The unemployment rate for March remained at seven percent, the same as the previous month. “March showed some solid signs of a return to previous job growth trends,” said Andy Condon, director of the Office of Research, in a release. “These include the third month in a row of an expanding labor force and employment/population ratio, growing manufacturing employment, and positive movements in private-sector hours and earnings Recovery trend employment growth appears to be returning following the volatile winter.” Among sectors reporting the greatest job gains for the month of March are leisure and hospitality (2,300 added positions) and transportation and public utilities (2,000 positions). Two sectors reported net job losses for March. The professional and business services sector lost 900 positions, and construction ended the month with 700 fewer jobs. DOL estimates that the state has recovered slightly more than half of the positions lost during the recessionary period from March 2008 to February 2010. Approximately 119,100 seasonally adjusted nonfarm jobs were lost during that time, the department reports. It asserts that since then a total of 65,000 positions, or 54.6 percent, have been regained.