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difference Site Outdoor Air Drybulb Temperature and Zone Outdoor Air Drybulb Temperature

Why there is difference between these two?

Site Outdoor Air Drybulb Temperature
Zone Outdoor Air Drybulb Temperature

Site Outdoor Air Drybulb Temperature
26.7135 26.409 26.19375 26.00475 25.8525 25.8735 26.18325 26.99175 28.13625 29.25975 30.25725 31.0185 31.575 31.96875 32.1 31.8795 31.428 30.8505 30.03675 29.23875 28.61925 28.05225 27.55875 27.11775

and

Zone Outdoor Air Drybulb Temperature
27.104459 26.978256 26.866087 26.765204 26.671216 26.593249 26.556566 25.089114 25.0 25 25 25 25 25 25 25 25 25 25 27.502535 27.858049 27.670282 27.519915 27.382448

strange is that difference (Site Outdoor Air Drybulb Temperature - Zone Outdoor Air Drybulb Temperature) is fixed for each hour ...where this come from?

0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325

I just run

Simulation Control

Do Zone Sizing, Do System Sizing, Do Plant Sizing, Do Design Days, Do Weather Simulation, Do HVAC SizingSi 1, Yes, Yes, Yes, Yes, No, No

difference Site Outdoor Air Drybulb Temperature and Zone Outdoor Air Drybulb Temperature

Why there is difference between these two?

Site Outdoor Air Drybulb Temperature
Zone Outdoor Air Drybulb Temperature

Site Outdoor Air Drybulb Temperature
26.7135 26.409 26.19375 26.00475 25.8525 25.8735 26.18325 26.99175 28.13625 29.25975 30.25725 31.0185 31.575 31.96875 32.1 31.8795 31.428 30.8505 30.03675 29.23875 28.61925 28.05225 27.55875 27.11775

and

Zone Outdoor Air Drybulb Temperature
27.104459 26.978256 26.866087 26.765204 26.671216 26.593249 26.556566 25.089114 25.0 25 25 25 25 25 25 25 25 25 25 27.502535 27.858049 27.670282 27.519915 27.382448

strange is that difference (Site Outdoor Air Drybulb Temperature - Zone Outdoor Air Drybulb Temperature) is fixed for each hour ...where this come from?

0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325 0.00325

I just run

Simulation Control

Do Zone Sizing, Do System Sizing, Do Plant Sizing, Do Design Days, Do Weather Simulation, Do HVAC SizingSi 1, Yes, Yes, Yes, Yes, No, No