(CSMONITOR) — A combination of high crude prices, refinery shutdowns, and early speculation has sent gas prices soaring to seasonal highs earlier than usual this year, with no signs of prices at the pump falling until spring, according to recent estimates.

Gas prices have climbed every day for the past 25 days, reaching a national average of $3.59 per gallon Monday, the most expensive national average ever for Feb. 11, according to AAA.

During just the past two weeks, average prices have climbed almost 25 cents, the biggest jump in gas prices in almost a year.

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