A microphone assembly includes a base that includes a first surface, a second surface and a third surface. The first surface is configured to connect the base to a mounting location in an external environment. The second surface is positioned parallel to the first surface with the third surface positioned therebetween. The third surface defines a curved shape to direct air flow that contacts the third surface in a direction away from the first surface. The microphone assembly also includes a cap disposed over and separated from the base by a gap. The cap includes a domed portion that has a convex shape that curves away from the second surface of the base. The microphone assembly also includes a microphone array that includes a plurality of microphones. The microphone array is disposed within the cap and is configured to receive acoustic signals from the external environment through the gap.