Crude Oil Seasonality: A Contract-Based Research Guide

Define what you are measuring

Crude oil seasonality can refer to an outright price, a calendar spread or a recurring feature of the forward curve. State which one you mean before comparing charts. A calendar spread measures the relationship between delivery months, so it can behave differently from the outright benchmark.

Also identify the benchmark. A WTI study and a Brent study should not be combined merely because both concern crude oil.

Use a consistent historical construction

Select the same contract-month relationship for every season. Record the rule used to align dates and exclude observations only under a documented method. If a price series rolls from one contract to another, understand the roll rule before interpreting a jump as a market event.

For a hypothetical July–December study, reconstruct that relationship each year rather than comparing an unspecified front-month series with December. This keeps the economic exposure closer to the research question.

Compare average and individual paths

Inspect the annual paths behind a seasonal average. A smooth mean can result from inconsistent years, and a few unusually large moves can dominate raw averages. Compare recent and longer windows, then check whether the direction and timing remain useful across those choices.

Choose entry and exit rules before examining every possible window. If you optimize the window on the same years used to report performance, label that result as in-sample research.

Add curve context

Read the forward curve alongside the seasonal chart. Ask whether the current relationship is in contango, backwardation or a mixed structure, and whether the selected spread crosses an important part of that curve. The curve is current pricing across delivery dates, not a guaranteed path for the spot price.

Use inventory and refinery information to test a proposed explanation. This guide is educational and contains no current crude price assessment. Platform energy coverage should be checked separately.

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