Third egg

In the past years there never remained an unhatched egg, so I do not know what should or shouldn't happen to that egg. Here we can see that it lies there untouched. 
But the weather has been miserable all day in that part of the country where the nest is. In the EXTRA we can see that it is rainy and windy, and we know that it has been cold. Even though the chicks are quite grown already, their mother still shields them with her large wings.