Weather is probably a major factor when you plan your trip to Old Harbor, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and July, with an average temperature of 11°C, while the coldest months are March and January, with an average of 1°C. The snowiest months in Old Harbor are December, February, March and January, with each month seeing an average of 43 cm of snowfall.