Well I think you are definitely in a Micro-Climate like location (as am I, my temp is not indicative of the Waynesboro area due to elevation). The official NWS recording station should be at a location that is more smoothed for the area. With that said, your changes were no where near as dramatic as THV. You had a 7 degree difference in an hour. Wind mixing temps like you suggested. They had a 9 degree difference in 20 min. Chinook worthy? Your humidity dropped 20%, theirs dropped 35%. I am not questioning the temps being real I am suggesting the sensors for THV are not indicative of the area as a whole and they are artificially lowered by a micro-climate. What do they do about it? Outside my pay. Someone could have a large property with temp differences of 5-10 degrees if there are hills and a calm night so placing the therm. at the bottom of the hills shows artificially induced temps that the majority of the area will not realize. Weather fun.