Remember, not all wire is listed or labeled as "sunlight resistant" as required by 310.10(D). Unfortunately they only have to be listed but are not required to be marked "sunlight resistant."
For example, USA Wire & Cable only lists its Black 1/0 or larger as sunlight resistant. That means no red or white exposed to sunlight and nothing under 1/0 such as what you would see on a temp service.
SouthWire, however says that their SIMpull THHN/THWN is listed and should be marked for "sunlight resistant" on wire #2awg and larger.
General Cable is the same as USA Wire & Cable with "sunlight resistant" marking for 1/0 and larger in black insulation only.
Republic Wire actually has UL approval giving a "sunlight resistant" rating to all sizes and colors.
There are other manufactures out there so for exposed mast weatherheads, you need to know what type wire, what color, what size and what manufacturer in order to check for compliance with 110.3(B) and 310.10(D)