Doctor visits for flu-like illness

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Is this a proxy for flu severity each season? Why are the curves so different each season? What factors make one season more severe than another? Weather? Rain? Temperature? The particular mutation of the virus?

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Source: https://gis.cdc.gov/grasp/fluview/fluportaldashboard.html Accessed 9/14/14

Percentage of visits for influenza-like illness reported by the U.S. Outpatient Influenza-like Illness Surveillance Network (ILINet), weekly national summary, selected seasons

See more at CDC's FluView