We live quite close to a Site of Special scientific Interest (SSSI), which is a wild area at one time used for peat-cutting.
It has been allowed to remain in its original state with paths crossing it to permit people to walk around in relative freedom. Because of the perpetually-damp state of the area, a mist can hang over it at certain times, which must be reminiscent of the great English moors.
This morning we had the first evidence of the mist moving over our back garden, with the resultant silence.
Yes Autumn has arrived!