savage13
commented
11 months ago Sky and Depths (MinusField) have a single temperature for each FieldMapArea.
Surface (MainField) areas have an array of Temperatures associated with different heights from 0 m to 1000 m. Since we do not know the height (directly/quickly) in an area or the height is variable in some areas it is difficult to attach a temperature to the Surface for a region.
Below are graphs of the Day and Night temperatures for a particular region against height (elevation). Attached to the y-axis is a histogram of the elevations for a specific region based on the heightmap data file. The background colors represent the Level 1 and 2 Heat or Cold temperatures. Some areas like the Gerudo Desert have different Day/Night temperatures and some areas like the Gerudo Frost Climate have elevations that cross the boundaries between Lv1 and Lv2 cold.
This all becomes more complicated in totk because "taking to the sky" is possible.
FYI: These are from botw, but it should be similar (should probably do these for totk).
The Sky and Depths Field Maps appear to show some or all temperatures for each area, but the Surface Field Maps are missing both the temperature ranges and the hazardous temperature levels/icons.