Can temperature effect the VIX? How about daylight? CXO has some answers (hat tip Abnormal Returns).
Guy Kaplanski and Haim Levy test the effect of seasonal environmental factors (daylight hours, temperature and fall season) on perceived market risk as indicated by the Chicago Board Options Exchange Volatility Index (VIX). VIX, also known as the Fear Index, is a measure of the risk perceived by traders of S&P 500 index options. Using VIX and actual volatility data and environmental measurements (for latitude 41 degrees north, Chicago and New York) over the period 1990-2007, they conclude that:
- The Fear Index (VIX) increases significantly during the fall and when the number of daylight hours is relatively small.
- The relationship between temperature and the Fear Index is inconsistent, perhaps because temperatures can vary considerably even for cities with the same number of daylight hours.
- On an annualized basis across the sample period:
- An increase of one hour of daylight boosts average stock market return by 1.35%.
- An increase of ten degrees Fahrenheit in temperature depresses average stock market return by 1.16%.
- The onset of the fall season depresses average stock the rate of stock market return by 1.72%.
- Seasonal environmental factors do not strongly affect actual volatility. In other words, options traders may be able to exploit differences between perceived risk and actual risk based on seasonal factors.
OK, not sure it’s “daylight” and not just something else having to do with the time of the year that causes this. Everyone knows that October is volatile for example, so why don’t we say like Pumpkins or wet leaves or the World Series causes VIX spikes.
But truthfully, that last bullet point has some actionable info. The VIX is about perception of what happens to volatility over the next 30 days. But this work suggests that even though perceived risk has lifted, actual risk has not.
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