This paper compares the effects of weather shocks on agricultural production in Britain, France and Germany during the late nineteenth century. Using semi- parametric models to estimate the non-linear agro-weather relationship, we find that weather shocks explain between one and two-thirds of variations in agricultural production. Given the large size of the agricultural sector during this period, the high variance of agricultural production and the cyclical nature of weather shocks, the agro-weather relationship transmitted large effects on macroeconomic fluctuations over much of the period.