지표 기온은 CRU-TS(Climate Research Unit-Time- series) 버전 4.02의 월평균, 월최댓값, 월최솟값 자료 를 이용하였으며, 해당 자료의 수평 해상도는 0.5° × 0.5°이다.
The surface temperature was using the monthly average, monthly, and monthly highs of CRU-TS (Client Research Unit-Time-series) version 4.02, and the horizontal resolution of the data is 0.5° × 0.5°.