You have the option of customising what you see in the calendar headings, be it either weather data, or man-hours.
Change the calendar headings, you will first have to click on the cogwheel in the calendar window:
Once clicked, the first option is to either set it to display man-hours or weather data.
If you have selected 'Weather data', you have the option of displaying the weather as either 'Average' or 'Maximum'
On the bottom, you have the option of selecting what you want to see in the calendar headings, depending on your selection.
'Weather data' selected:
'Man-hours' selected:
You also have the option of moving the different criteria you see by dragging and dropping the different selections:
