Including the change in gas prices in Arkansas during the past week, prices yesterday were 8.2 cents per gallon lower than the same day one year ago and are 11.4 cents per gallon higher than a month ago. The national average has increased 3.9 cents per gallon during the last month and stands 10.4 cents per gallon lower than this day one year ago. "The National Weather Service says this week begins with much of California under a 'hard freeze warning' and separate storm systems tracking across the Great Lakes region and from the Gulf Coast to the northeast, bringing snow, sleet and freezing rain from the Lower Mississippi River Valley northeastward to New England,' said Gregg Laskoski, senior petroleum analyst, GasBuddy. "Under conditions like that, consumer demand usually declines and that often results in a nominal decrease in retail gas prices," Laskoski added. "That may be what lies ahead this week."