# Weather Derivative: Definition, How It Works, Types & Examples

> **Definition**
>
> A weather derivative is a financial instrument that allows companies or individuals to hedge against the risk of financial losses due to adverse weather conditions.

## What Is a Weather Derivative?

A weather derivative is a financial instrument used by companies or individuals to [hedge](https://www.investopedia.com/terms/h/hedge.asp) against the risk of weather-related losses. The seller of a weather derivative agrees to bear the risk of disasters in return for a [premium](https://www.investopedia.com/terms/p/premium.asp). If no damages occur before the expiration of the contract, the seller will make a profit—and in the event of unexpected or adverse weather, the buyer of the derivative claims the agreed amount.

### Key Takeaways

*   A weather derivative is a financial instrument used by companies or individuals to hedge against the risk of weather-related losses.
*   They trade over-the-counter (OTC), through brokers, and via an exchange.
*   Weather derivatives work like insurance, paying out contract holders if weather events occur or if losses are incurred due to certain weather-related events.
*   Agriculture, tourism and travel, and energy are just a few of the sectors that utilize weather derivatives to mitigate the risks of weather.

## Understanding Weather Derivatives

The [profitability](https://www.investopedia.com/terms/p/profit.asp) and revenues of virtually every industry—agriculture, energy, entertainment, construction, travel, and others—depend to a great extent on the vagaries of temperature, rainfall, and storms. Unexpected weather rarely results in price adjustments that entirely make up for lost revenue, making weather derivatives securities that allow companies to hedge against the possibility of weather that might adversely affect their business a pivotal investment for many.

Companies whose business depends on the weather, such as hydroelectric businesses or those who manage sporting events, might use weather derivatives as part of a risk-management strategy. Farmers, meanwhile, may use weather derivatives to hedge against a poor harvest caused by too much or too little rain, sudden temperature swings, or destructive winds.

> **Fast Fact**
>
> It is estimated that nearly one-third of the world's GDP is affected by the climate.

In 1997, weather derivatives began trading [over-the-counter](https://www.investopedia.com/terms/o/otc.asp) (OTC) and, within a few years, they had become tradeable on an exchange and treated by some hedge funds as an investment class. The [Chicago Mercantile Exchange](https://www.investopedia.com/terms/c/cme.asp) (CME) lists weather futures contracts for a few dozen cities, the majority of them in the U.S.

CME weather futures, unlike OTC contracts, are standardized contracts traded publicly on the open market in an electronic auction type of environment, with continuous negotiation of prices and complete [price transparency](https://www.investopedia.com/terms/p/pricetransparency.asp). Investors who like weather derivatives appreciate their low [correlation](https://www.investopedia.com/terms/c/correlation.asp) with traditional markets.

## Types of Weather Derivatives

Weather derivatives typically have a basis to an [index](https://www.investopedia.com/terms/i/index.asp) that measures a particular aspect of weather. For example, an index might be the total rainfall over a specified period in a specific place. Another can be for the number of times the temperature falls below freezing. 

One climate index for weather derivatives is known as [heating degree days](https://www.investopedia.com/terms/h/heatingdegreeday.asp) or HDD. Under HDD contracts, each day the daily mean temperature falls below a predetermined reference point over a specified period, the amount of the departure is recorded and added to a cumulative count. The final figure determines whether the seller pays out or receives payment.

## Weather Derivatives vs. Insurance

Weather derivatives are similar to but different from insurance. Insurance covers low-probability, catastrophic weather events such as hurricanes, earthquakes, and tornadoes. In contrast, [derivatives](https://www.investopedia.com/terms/d/derivative.asp) cover higher-probability events such as a dryer-than-expected summer.

Insurance does not protect against the reduction of demand resulting from a slightly wetter summer than average, for example, whereas weather derivatives can do just that. Since weather derivatives and insurance cover two different possibilities, a company might have an interest in purchasing both.

Also, since the contract is index-based, buyers of weather derivatives do not need to demonstrate a loss. In order to collect insurance, on the other hand, the damage must be shown.

## Weather Derivatives vs. Commodity Derivatives

One important point that differentiates utilities/[commodity](https://www.investopedia.com/investing/commodities-trading-overview/) derivatives (power, electricity, agricultural) and weather derivatives is that the former set allows hedging on price based on a specific volume, while the latter offers to hedge the actual utilization or the yield, independent of the volume.

For instance, one can lock the price of X barrels of [crude oil](https://www.investopedia.com/terms/c/crude-oil.asp) or X bushels of corn by buying oil [futures](https://www.investopedia.com/terms/f/futures.asp) or corn futures, respectively. But getting into weather derivatives allows hedging the overall risk for yield and utilization.

A temperature dipping below 10 degrees will result in complete damage to wheat crop, whereas rain on weekends in Las Vegas will impact city tours. Hence, a combination of weather and commodity derivatives is best for overall risk mitigation.

## What Are Climate Derivatives?

Climate derivatives are financial instruments used to [hedge against financial losses](https://www.investopedia.com/articles/active-trading/111014/it-possible-trade-weather.asp) related to adverse weather conditions, such as droughts, hurricanes, and monsoons. Climate derivatives, also known as weather derivatives, work in a similar fashion to insurance. The buyer of a climate derivative will receive a monetary payment (as stipulated by the derivative contract) by the seller of the derivative in the event a certain climate-related event occurs or if the buyer suffers any financial loss due to a climate event.

## How Do Weather Derivatives Work?

Weather derivatives work as a contract between a buyer and a seller. The seller of a weather derivative receives a premium from a buyer with the understanding that the seller will provide a monetary amount in case the buyer suffers an economic loss due to adverse weather or if any adverse weather occurs. If no adverse weather event occurs, then the seller makes a profit through the premium paid.  

## What Are the Types of Derivatives?

A derivative is a financial instrument whose value is tied to an underlying asset. The main types of derivatives are options, futures, forwards, and swaps.

> **Article Sources**
>
> 1.  Investment Executive. "[Hedging Against Climate Risks Using Weather Derivatives](https://www.investmentexecutive.com/inside-track_/the-canadian-derivatives-institute/hedging-against-climate-risks-using-weather-derivatives/)."
>     
> 2.  CME Group. "[Introduction to Weather Derivatives](https://www.cmegroup.com/trading/weather/files/WEA_intro_to_weather_der.pdf)," Page 1.