Using http://www.wunderground.com/ research the following:
a) Choose 4 different GLOBAL cities at the same time 2 from the northern and 2 from the southern hemisphere, and compile their
daily average pressure and observed weather conditions for 5 days. 
All you need to do this part
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b) Analyze the data and explain the correlations between the daily average pressures and the observed weather conditions.
Weather stations (red dots) are scattered unevenly across the globe. They are especially sparse in Africa and over the oceans. Before scientists could be confident in global temperature records, Hansen needed to demonstrate that widely spaced observations captured global temperature trends accurately. (NASA map by Robert Simmon, based on data from the http://www.ncdc.noaa.gov/oa/climate/ghcn-monthly/index.php
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