According to the FAA and NTSB loss of control accidents, many of them weather related, are the leading cause of flight related deaths in general aviation VFR private pilots.  

This is the reason why your insurance company will significantly reduce your premiums upon achieving your instrument rating. It statically makes you a much safer pilot.

For more information:

https://www.ntsb.gov/safety/safety-studies/Documents/SS0501.pdf