Here are various Illinois statistics from startseeingmotorcycles.org – a safety campaign by the Illinois Department of Transportation.
When Motorcyclists Are Killed
Generally, the hours of 6:00 p.m. on Friday through 11:59 p.m. on Sunday are deadlier for motorcyclists than other periods of the week. In 2009, 73 (59%) of the fatal crashes involving motorcycles occurred during the weekend.
41 (35%) of the 116 motorcycle operators killed in 2009 had been drinking. While the age of the impaired operators ranged from 22 to 67, almost 49% of them were aged 40-49.
The BAC results for the impaired motorcycle operators tested in 2009 ranged from 0.02 to 0.28, with the average BAC being 0.14.
All but one of the 41 impaired motorcycle operators killed were male.
Only one of the impaired operators killed, a male with a BAC of 0.16, wore a helmet.
27 (66%) of the fatal crashes involving impaired motorcycle operators occurred between 6:00 p.m. on Friday and 11:59 p.m. on Sunday.
Also, the page says that “Weather and roadway surface condition are generally not factors in crashes that result in motorcycle fatalities. In 2009, approximately 93% of such crashes occurred in clear weather, on dry pavement.”