Trading Strategies and ideas

Does VIX Always Decline In December?

December typically is when everybody slows down and celebrates holidays. So naturally one would think the market volatility should also decline in December.

I decided to do a quick calculation with VIX historical data (2004 – 2017) to find out if VIX has always gone down in December from November.

While the calculation methods I used were rather simple and may not be scientifically acceptable, there is a higher probability that VIX is lower in December compared to November.

VIX Historical Data 2004 – 2017

Historically, VIX is known to go down in December because the market is not as active so the hedging effect is not as high. To find out how significant the drop is, I did a quick analysis of the historical VIX data shown in the following video.

The reason I am particularly interested in this topic is that I hold open positions for December 2018 expiration options shorting VXX and UVXY, so my hope is for the VIX to go down at least closer to 15 or even lower.

In addition to playing around with the VIX historical data, I have also found this article and this article from to be very helpful.

In which they talk about the SKEW index and VVIX along with other facts that indicate VIX will likely go lower in the near future.

According to the CBOE website, the SKEW index definition is as follows. It is also known as a “Black Swan index”.

The crash of October 1987 sensitized investors to the potential for stock market crashes and forever changed their view of S&P 500® returns. Investors now realize that S&P 500 tail risk – the risk of outlier returns two or more standard deviations below the mean – is significantly greater than under a lognormal distribution. The Cboe SKEW Index (“SKEW”) is an index derived from the price of S&P 500 tail risk. Similar to VIX®, the price of S&P 500 tail risk is calculated from the prices of S&P 500 out-of-the-money options. SKEW typically ranges from 100 to 150. A SKEW value of 100 means that the perceived distribution of S&P 500 log-returns is normal, and the probability of outlier returns is therefore negligible. As SKEW rises above 100, the left tail of the S&P 500 distribution acquires more weight, and the probabilities of outlier returns become more significant. One can estimate these probabilities from the value of SKEW. Since an increase in perceived tail risk increases the relative demand for low strike puts, increases in SKEW also correspond to an overall steepening of the curve of implied volatilities, familiar to option traders as the “skew”.

VVIX is essentially the volatility of VIX, so we can use it to gauge which way VIX is likely to move.

In addition to these two, I have also found VIX9D (9-day volatility index) to be a useful indicator. Based on my observation, a lot of time Backwardation happens when VIX9D is higher than VIX.

When plotted VIX, VVIX, and VIX9D together, they do correlate together and the baseline of VVIX could potentially be used as an early indicator of which ways VIX will likely move. In fact, the articles by mentioned earlier show that the recent spike in VIX (November) was not the same as the one in October because of the VVIX level.

I have also plotted the chart below showing the level of VVIX (blue) in November is substantially lower comparing the two previous VIX peaks in October.

VIX and VVIX in Oct-Nov 2018


Based on the VIX historical data from 2004 – 2017, there is a higher probability that VIX is lower in December compared to November.

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