NOAA has an excellent website for monitoring global and U.S. conditions at http://www.ncdc.noaa.gov/climate-monitoring/index.php This site gives an overview of temperatures, precipitation, global hazards, tornadoes, wildfires, droughts, and other conditions for each month. The monthly reports are typically posted about a week or so after the end of the month. You can choose from the archive of past months/years as well.
Here is a screen shot of one of the many products available. This one is called the “U.S. Climate at a Glance” product. With this particular product you can generate national, regional, statewide maps as well as plots for key cities. Give it a try.