If there is any way you can get a tank in your basement or within the heat envelope of your house, do it! Around here external kerosene tanks are nearly exclusively for mobile homes.
The Northeast is having issues getting kerosene, and it's like $7/gal due to the war in Europe.
You don't want to "time the market" ordering Kerosene just before a cold snap. Mother Nature waits for no one. You'll want Kerosene, all the time, save maybe for one order in April to get through the summer, especially if you get your hot water from your boiler.
If I owned a 55 gal barrell, I'd fill it up, stabilize it, and hold it in reserve. Then I'd have the oil company deliver fuel.