Site contains much weather information, including “departure from average temperature” maps. You’ll just have to do some clicking of the many links provided.
COD’s Next Generation Weather Lab features many great weather analysis tools. In addition to the usual suite of satellite and radar imagery, surface and upper air weather maps and NWP output, the site also has pressure change maps, cross sectional analyses and isentropic charts.
College of DuPage
This site features an array of surface weather maps for the U.S., North America and the globe. If you click on the Unified Surface Analysis (hyperlink near top of page), you’ll get a global view of surface highs, lows, and fronts. Click on the map and you’ll zoom into that area and see plotted surface weather reports.
NOAA / National Center for Environmental Prediction
Created by students at OU, the site features lots of real-time weather data.
University of Oklahoma
Not sure what all the numbers and symbols mean on surface weather maps? Use this decoder page to help you make sense of the data.
Weather Station Plotting Model Decoded