Neighborhood Weather Station

Someone in the neighborhood has put up a low tech weather station near by that Frannie and I pass most days of the week. As you can see it consist simply of a rock hanging from a rope. The sign above explains the use of the weather station. It reads as follows:

Rock is wet .................. It is raining
Rock is white ................ It is snowing
Rock is moving ............. It is windy
Rock can not be seen .... It is cloudy
Rock throws a shadow .. The sun shines
Rock is not there ............ Rock has been stolen