Finds that from 1980 - 2010:
- Areas covered by extreme cold air in cold seasons decreased significantly in the northern hemisphere; observed trend was negative but not statistically significant in the southern hemisphere
- Areas covered by warm air during summer seasons increased significantly in both hemispheres
- The northern hemisphere is tending toward increasingly warmer and more humid summers: "overall, more warm air, larger ridges, and warmer air"
- During the warm season, the global area covered by precipitable water values equal to or greater than 60mm is increasing
- The significant changes in weather are "occurring in the tails of the distribution"
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