BALTIMORE, MD (WBFF) — Gas prices in Baltimore have risen 19.3 cents per gallon in the past week, averaging $3.50 per gallon, according to GasBuddy's new survey.

Prices in Baltimore are 12.0 cents per gallon higher than a month ago and stand 22.5 cents per gallon higher than a year ago.

The national average price of diesel has declined 2.2 cents in the last week and stands at $4.00 per gallon.

"Most Americans continued to see average gasoline prices march higher last week. The reason is the season: gasoline demand is rising as more Americans are getting out, combined with the summer gasoline switchover, which is well underway, and continued refinery maintenance," said Patrick De Haan, head of petroleum analysis at GasBuddy. "The madness should slow down in the next few weeks as we've seen positive data that refinery output is starting to increase, a sign that the peak of maintenance season could be behind us. In some positive news for Midwest motorists, the bp refinery in Whiting, Indiana that can process 440,000 barrels of oil per day is finally back to normal operations for the first time since an electrical failure happened in early February. For now, gas prices will likely continue to trend higher, but the fever may break soon. When it comes to diesel, the news has been good - above average temperatures have lowered heating oil demand, and average diesel prices are on the cusp of falling back below $4 per gallon."

According to GasBuddy price reports, the cheapest station in Baltimore was priced at $3.23/g yesterday while the most expensive was $4.47/g, a difference of $1.24/g.

The national average price of gasoline has risen 4.4 cents per gallon in the last week..

The national average is up 18.7 cents per gallon from a month ago and stands 1.6 cents per gallon higher than a year ago, according to GasBuddy data.