Have you ever seen horses in a field facing the same direction?

I had to do an errand today that required me to drive by many farms with horses standing in fields.  What seemed odd to me was that many of the horses were just standing with their heads hung down but facing the same direction.  I noticed this at each farm I passed and I mean that all of the horses- not only the horses at one farm- but all of them were faceing the same direction.  Why? 
First, if you start to look for this, you will notice that not ALL horses face the same direction everyday on every farm.  But many do on some days. 

In this case we had a huge rain storm headed our way.  I wondered if the horses were facing away from the oncoming rainstorm.  I also googled this question and found that horses me face the same direction for the following reasons:
To avoid sun in their eyes
To avoid wind in their eyes
and to avoid bad weather coming at them (such as rain or snow).