Take into account the type of natural lighting that the local climate typically provides.

If there is a high proportion of cloudy, rainy or overcast days, provide for greater amounts of natural lighting.

If there is a high proportion of sunny days, provide for sufficient shading from the harsh sun.

Also take into account how high the sun typically is in the sky. At high latitudes, the sun will be lower in the sky for a greater portion of the year. At lower latitudes, the sun will be higher.