What it means
Weather affects many businesses directly. Rain can force an outdoor concert to close, a late frost can destroy a fruit harvest, and a storm can delay a building project.
Weather insurance transfers part of that risk to an insurer in exchange for a premium. There are two main styles.
Traditional cover, called indemnity insurance, pays for the loss the business can prove, such as the ticket income lost when an event is cancelled. Parametric cover pays a pre-agreed amount when a measured trigger is reached, for example when rainfall at a named weather station exceeds a set number of millimetres.
Parametric cover has advantages in speed and certainty. Payment depends on the data, not on a loss adjuster visiting the site, so it is often made within days.
The trade-off is basis risk, which means the payout might be larger or smaller than the real loss, or might not be triggered at all even though the business suffered. Premiums reflect the chance and size of a loss.
Insurers study weather records, the location and the timing, and they add a margin for costs and profit. A summer outdoor event in a rainy region will cost more to insure than the same event in a dry one.
Weather insurance is related to, but separate from, weather derivatives. Insurance usually requires an insurable interest, which means the buyer must have a real exposure to the weather, while derivatives can be traded by anyone.
Many finance teams treat the premium as an operating cost and look at it alongside other protection such as business interruption cover.
In practice
Real-world examples.
Example
A wedding venue sells outdoor packages and buys cover against heavy rain on peak weekends. When rain forces several events indoors, the insurer pays a fixed sum for each affected day. The payment helps cover the cost of hiring marquees at short notice.
Example
A fruit grower buys frost cover for an orchard. A late cold spell damages the blossom and the harvest falls by 40%. The insurer pays for the loss in line with the policy terms, helping the grower repay the seasonal loan.
Example
A construction firm building a bridge buys cover that pays if the number of windy days exceeds an agreed number. Crane work is delayed and the firm incurs extra costs. The parametric payout arrives within a week and covers most of the standby charges.
Formula
Calculation
Expected loss = Probability of the weather event x Loss if it occurs
Premium = Expected loss x (1 + Loading), where loading covers the insurer's costs and profit
Suppose an organiser of an outdoor festival has $200,000 of income at risk if heavy rain forces a cancellation. Historical records suggest a 10% chance of such rain on the event date. The expected loss is 0.10 x 200,000 = $20,000. If the insurer adds a loading of 40%, the premium is 20,000 x 1.40 = $28,000. The organiser pays $28,000 to protect $200,000 of income.Case study
Seen in the real world.
Riverbank Open-Air Cinema is an illustrative, fictional company that screens films on summer evenings and earns $150,000 over twelve weeks. In a rainy season the owner had lost $30,000 of ticket income from cancelled shows.
The following year he bought parametric weather cover with a trigger of more than 15 millimetres of rain at the nearest official station on a show night. The policy paid $2,500 for each triggered night, up to a cap of $30,000, and cost a premium of $4,500.
In this illustrative story it rained on seven show nights, and the policy paid $17,500, which kept the business profitable for the season. The owner also noticed that two shows were hit by local showers that the station did not measure, which is the basis risk in practice.
Watch out
Common mistakes.
- Assuming the policy pays for any bad weather, when it only responds to the specific events and trigger levels written in the contract.
- Ignoring basis risk in parametric cover, where the weather at the station may differ from the weather at your site.
- Buying cover too late, since insurers may refuse or increase the price once a forecast shows a high chance of the event.
Questions
People also ask.
What is parametric insurance?
It is insurance that pays a set amount when a measurable event, such as rainfall above a threshold, occurs, regardless of the actual loss.
Is weather insurance the same as a weather derivative?
They have similar economics, but insurance needs a real exposure to the weather and is regulated as insurance, while a derivative can be traded by anyone.
What affects the price?
The probability of the event, the size of the possible payment, the location, the season and the insurer's costs all influence the premium.
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