Close to midday, the Sun may still be below the horizon, however, it does get quite close to it. During this time, the light levels rise to a twilight before sinking back into darkness again.
|Midday on 30-Nov-2013 at KAIRA. (Photo: D. McKay-Bukowski)|
Despite the midnight sun in Summer and huge spans of twiilight, the sun never rises particularly high and so the incident light and warmth remains marginal... hence the cooler temperatures.