A Greenhouse Climate Response Index is an index developed by the National Climatic Data Centre of the United States of America that includes the following variables: much-above-normal temperature, much-above-normal precipitation in the cool months, extreme or severe drought in the warm months, a much greater than normal proportion of annual precipitation falling on days having more than 50.8 millimetres of precipitation, and reduced day to day temperature swings. (Source: OECD)