30 C.F.R. § 779.18
(a) When requested by the regulatory authority, the application shall contain a statement of the climatological factors that are representative of the proposed permit area, including:
[44 FR 15354, Mar. 13, 1979, as amended at 45 FR 51550, Aug. 4, 1980; 81 FR 93327, Dec. 20, 2016; 82 FR 54948, Nov. 17, 2017]