A model has been developed, which provides a risk reference of BTv transmission at any time and location based on historical climate records. The risk reference of BTv transmission is indicated as the percentage of days with potential for BTv transmission. The figure shows example outcomes from the model which mapped the percentage of days during 1993-2016 that had some potential for BTv transmission (aggregated by the fortnight). It illustrates that the risk of BTv transmission in Scotland increased in warmer seasons.