The climate of Ashburn is temperate and becomes increasingly warmer and more humid farther south and east. Seasonal extremes vary from average lows of 26 °F in January to average highs of 86 °F in July. The Atlantic Ocean has a strong effect on eastern and southeastern coastal areas of the state. Influenced by the Gulf Stream, coastal weather is subject to hurricanes, most pronouncedly near the mouth of Chesapeake Bay. In spite of its position adjacent to the Atlantic Ocean, even the coastal areas have a significant continental influence with quite large temperature differences between summer and winter, particularly given the state climate’s subtropical classification, which is typical of states in the Upper South.
Virginia has an annual average of 35–45 days of thunderstorm activity, particularly in the western part of the state, and an average annual precipitation of 42.7 inches. Cold air masses arriving over the mountains in winter can lead to significant snowfalls, such as the Blizzard of 1996 and winter storms of 2009–2010. The interaction of these elements with the state’s topography creates distinct microclimates in the Shenandoah Valley, the mountainous southwest, and the coastal plains. Virginia averages seven tornadoes annually, most F2 or lower on the Fujita scale.
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