Weather is probably a major factor when you plan your trip to Nimpo Lake, 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 14°C, while the coldest months are December and February, with an average of -3°C. The snowiest months in Nimpo Lake are January, February, December and March, with each month seeing an average of 123 cm of snowfall.