The price tag for staying warm in Maine increased dramatically over the past two weeks, a yang to the yin of falling temperatures.

Maine’s State Planning Office released figures Wednesday showing that No. 2 heating oil climbed an average of three cents since last week. It’s selling for $1.51 per gallon today. That’s 14 cents higher than a year ago.

It’s also 10 cents higher than oil cost just two weeks ago.

At that rate, someone who uses 1,000 gallons of No. 2 between now and the end of the heating season would pay an extra $100 to stay toasty.

Kerosene costs more, $1.74 per gallon, up four cents on the week and 14 cents on the year. Kerosene’s two-week price rise was 11 cents.

Propane didn’t get a pass, either. That heating source is retailing at $1.78 per gallon, up six cents on the week after a one-cent rise the week prior. A year ago it was selling for $1.62 per gallon.

The SPO explained the increases this way:

“While distillate fuel inventories have increased since the start of the new year, crude oil inventories are at a historical low point. The paucity of crude oil limits refinery capacity to immediately boost the production of key refined products to meet demand. This, in turn, can restrict distribution of refined products in areas where demand is greatest and can create the potential for price volatility.”

Spot crude futures prices passed the $36 per barrel price this week in the New York Mercantile trading. The prices reflect several factors.

Among them, an improving global economy is gobbling up more oil to fuel the expansion while oil-producing nations, for the most part, haven’t increased output or exports.

In the United States, the federal government also opted to begin purchasing large quantities of crude oil to fill the strategic oil reserve in Louisiana about the same time the weather in the Northeast turned wintry. That created additional price pressure on oil, sending up prices for refined products such as gasoline, diesel fuel and No. 2.

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