What Is a Weather Derivative?

What Is a Weather Derivative?

Let me explain to you what a weather derivative is—it's a financial instrument that you or your company can use to hedge against the risk of financial losses due to adverse weather conditions. As the seller, you agree to bear the risk of disasters in exchange for a premium. If no damages happen before the contract expires, you make a profit, but if unexpected or adverse weather hits, the buyer claims the agreed amount.

Understanding Weather Derivatives

You need to know that the profitability and revenues of almost every industry—think agriculture, energy, entertainment, construction, travel, and more—depend heavily on temperature, rainfall, and storms. Unexpected weather rarely leads to price adjustments that fully cover lost revenue, so weather derivatives become crucial securities for hedging against weather that could harm your business.

If your business relies on weather, like hydroelectric operations or managing sporting events, you might incorporate weather derivatives into your risk-management strategy. Farmers, for instance, use them to protect against poor harvests from too much or too little rain, sudden temperature changes, or destructive winds.

Here's a fast fact: it's estimated that nearly one-third of the world's GDP is affected by the climate.

Weather derivatives started trading over-the-counter in 1997, and soon after, they became available on exchanges and even treated as an investment class by some hedge funds. The Chicago Mercantile Exchange lists weather futures for dozens of cities, mostly in the U.S. Unlike OTC contracts, CME weather futures are standardized, traded publicly in an electronic auction with continuous price negotiation and full transparency. Investors value them for their low correlation with traditional markets.

Types of Weather Derivatives

Weather derivatives usually base themselves on an index measuring a specific weather aspect, such as total rainfall over a period in a certain place or the number of times the temperature drops below freezing.

One common index is heating degree days, or HDD. With HDD contracts, each day the mean temperature falls below a set reference point during a period, you record the departure and add it to a cumulative count. That final figure decides if the seller pays out or receives payment.

Weather Derivatives vs. Insurance

Weather derivatives resemble insurance but differ in key ways. Insurance covers low-probability, catastrophic events like hurricanes, earthquakes, and tornadoes. Derivatives, however, handle higher-probability events, such as a drier-than-expected summer.

Insurance won't protect against reduced demand from a slightly wetter summer, but weather derivatives can. Since they cover different risks, you might want both. Also, being index-based, weather derivatives don't require you to prove a loss to collect—unlike insurance, which demands evidence of damage.

Weather Derivatives vs. Commodity Derivatives

A key difference between utility or commodity derivatives—like those for power, electricity, or agriculture—and weather derivatives is that the former let you hedge price based on a specific volume, while the latter hedge actual utilization or yield, regardless of volume.

For example, you can lock in the price of X barrels of crude oil or X bushels of corn with futures, but weather derivatives let you hedge overall risk for yield and utilization. A temperature drop below 10 degrees could destroy a wheat crop, or weekend rain in Las Vegas could hurt city tours. That's why combining weather and commodity derivatives works best for comprehensive risk mitigation.

What Are Climate Derivatives?

Climate derivatives are financial instruments you use to hedge against losses from adverse weather like droughts, hurricanes, and monsoons. Also called weather derivatives, they operate much like insurance. As the buyer, you get a monetary payment from the seller if a specified climate event occurs or if you suffer financial loss from one.

How Do Weather Derivatives Work?

These derivatives function as a contract between buyer and seller. You, as the seller, receive a premium from the buyer, agreeing to pay out if the buyer faces economic loss from adverse weather or if such weather occurs. If nothing happens, you profit from the premium.

What Are the Types of Derivatives?

A derivative is a financial instrument whose value ties to an underlying asset. The main types include options, futures, forwards, and swaps.