Weather derivatives are financial contracts whose value depends on measurable weather outcomes — temperature, rainfall, snowfall, wind speed. The market, worth an estimated $30 billion in notional value, lets energy companies, agricultural firms, retailers, and yes, speculators, trade weather risk.
How They Work
The most common contracts are based on Heating Degree Days (HDD) and Cooling Degree Days (CDD) — measures of how much temperatures deviate from 65°F. A natural gas utility might buy HDD put options to protect against warm winters that reduce heating demand. A ski resort might buy snowfall contracts.
Where They Trade
CME Group lists standardized weather futures and options for major US and European cities. Kalshi offers binary weather contracts for retail traders — simpler bets on whether temperature will exceed a threshold on a specific day. The barrier to entry has never been lower.
The AI Edge
Quantitative trading firms are applying machine learning to weather prediction, seeking forecast edges of even 0.5°F over consensus models. Better predictions translate directly to profitable positions. Firms like Climavision and Tomorrow.io sell proprietary weather data and forecasts to financial clients.
Growing Relevance
As climate change increases weather volatility, demand for weather risk management is growing across industries. Airlines hedge fuel costs against temperature-dependent demand. Event companies hedge against rain. Agriculture has always been weather-dependent — now the hedging tools are more accessible.
