A spatial analysis of trends in the UK climate since 1914 using gridded datasets
of annual indices have also been calculated and gridded. These were derived from daily temperature (T) or precipitation data using the following definitions: • Growing Season Length (GSL) = period (days) bounded by daily T_mean > 5 °C and < 5 °C (after 1 st July) for ≥ 6 days. • Heating Degree Days