Is it just limited to those temperature sensors located near heat sinks like a concrete building or an asphalt parking lot? From Reuters, this story about a little "global warming" in Northern Ireland:
When the snow started falling on Thursday afternoon nobody in the Glens of Antrim could have predicted the devastating impact it would have on the farming community. Sub-zero temperatures and heavy snow fall combined with strong easterly winds produced 30 foot snowdrifts.(H/t Instapundit)
The rolling hillsides, where just a week previously daffodils had swayed in the breeze in the watery spring sunshine, now lay covered in an unseasonable layer of deep snow. But below the beautiful winter wonderland landscape the tragic reality of nature lay hidden – thousands of sheep buried with their farmers unable to reach them.
Many of the ewes were ready to lamb and were buried alive as the snow blew into drifts several feet high.