Although weather is just one factor, it can really affect your travel plans, especially if you are planning a longer stay in Martinsburg. The hottest months are usually July and August, with an average temperature of 22°C, while the coldest months are January and February, with an average of -3°C. The snowiest months in Martinsburg are January, December, October and February, with each month seeing an average of 14 cm of snowfall.