Actual annual average temperature,

Actual annual average temperature, for organic liquids, means the temperature determined using the following methods:
(1) For heated or cooled storage tanks, use the calculated annual average temperature of the stored organic liquid as determined from a design analysis of the storage tank.
(2) For ambient temperature storage tanks:
(i) Use the annual average of the local (nearest) normal daily mean temperatures reported by the National Climatic Data Center; or
(ii) Use any other method that the EPA approves.

Source

40 CFR § 63.2406

Scoping language

Terms used in this subpart are defined in the CAA, in 63.2, 40 CFR part 63, subparts H, PP, SS, TT, UU, and WW, and in this section. If the same term is defined in another subpart and in this section, it will have the meaning given in this section for purposes of this subpart. Notwithstanding the introductory language in 63.921, the terms container and safety device shall have the meaning found in this subpart and not in 63.921.