By Graham ShelbyGas prices are up in Louisville and throughout Kentucky. The average cost of a gallon of gasoline in Louisville is $3.05 per gallon. The statewide average is about $2.99. That’s about fifty cents higher than the average cost a year ago. Triple-A spokesperson Roger Boyd says the increase is due to many factors. “First of all, forecasts, we’ve already seen a very cold winter. Obviously, that affects the market that affects gas prices. But then there’s also price per barrel, which is over ninety dollars a barrel, additionally inventories are a little bit low, so a number of issues going in,” he said. Boyd says the price increase, though frustrating to motorists, is within the normal range for this time of year.