MIKE MOSS SAYS:     Laura,      If you click the "Almanac" link on our main weather page, you will find a box that allows you to view historical weather observations from the RDU airport for any date you choose from the past. Once you are on the historical data page, you can view the info day by day, or on graphs, or by week or month, and there will be links for stepping ahead or back to other months, weeks, and so on. Also, there is a box along the right hand side of the page that will allow you to change the view to different locations in case another weather site would be closer to your home than RDU.For your purposes, note that the monthly view has a daily summary at the bottom of the page that includes the max, min and mean observed pressure for each day.