The start of 2013 has been tough for consumers. Now we're getting hit at the gas pump, with fuel prices climbing to an average of $3.75 a gallon. What's behind the jump?

Refinery shutdowns are leading to tighter supply, which also has driven up prices. Refineries often use winter for maintenance, given historically lower demand for gasoline as drivers cut back in poor weather.

But some analysts are puzzled by the rise, given that gas prices typically see a jump in March and April, when drivers start using their cars more frequently.Analysts are agreeing  Prices aren't likely to reverse direction anytime soon. Residents in Southern California are paying the highest prices in the country, with Santa Barbara drivers paying an average of $4.32 a gallon. The cheapest gas is found in Billings, Mt. where a gallon sells for an average of $3.17.

Some consumers are paying even more. A few locations have reported gas prices of more than $5 per gallon. One station in Los Angeles was selling regular unleaded for $5.19 a gallon. When will it stop?