Earthzine published an interesting article earlier this month about the decrease in wind speeds that have occurred in recent years compared to the longer-term average. You can read it at https://earthzine.org/2016/06/10/a-new-kind-of-drought-u-s-record-low-windiness-in-2015/. This is important because of our increasing use of wind power to provide electricity, since lower wind speeds are less efficient for power production and could reduce our electrical output. Note that the study addresses average wind speeds, not extreme winds which can cause structural damage.
The record low wind is linked mainly to a strong ridge of high pressure which dominated the western US and part of the South in 2015. This ridge was in turn linked to unusually warm waters in the Pacific Ocean (both El Nino near the equator and “the blob” of warm water in the central Pacific which existed for much of 2015.
