Tis the season.

TheStreet.com: Winter's Chill May Warm Energy Stocks.

If you look at this chart from the article, it looks like, on average, the time to be in energy service stocks is December 1 through April 30.

Which corresponds pretty well with the "Sell in May, and go away." seasonal timing theory that some people use for the market as a whole.

Amusing, but, as they say, your mileage may vary.