Agriculture is one of the most weather-sensitive industries． Adverse weather affects agricultural productions，and compels the“company ＆ farmer”pattern to face high default rates． To solve this issue，this paper considers an example of late spring coldness，and builds a decision model for a two-stage agricultural supply chain consisting of a risk-averse farmer and a risk-neutral company． By employing the CVaＲ criterion，a decision function is constructed for the risk-averse farmer． Further，an improved price protection contract is put forward based on adverse weather index． The results show that the improved price protection contract can solve the distortion in agricultural material input levels． However，it cannot eliminate the negative impacts of adverse weathers． Hence，a weather put option contract is developed based on the improved price protection contract． It is found that the weather put option contract can fully coordinate the supply chain，and the coordination will not be affected by the change of adverse weathers． In addition，the weather put option can help the company transfer the adverse weather risks，so that the relative stable revenues of both the company and the farmer are guaranteed．