It has been hypothesized that there is a link between Sudden
Infant Death Syndrome (SIDS) and environmental temperature. Between
8 January 1979 and 31 November 1985 (242 days), that day's average
temperature (in degrees Celsius) and the number of SIDS deaths on
the FOLLOWING day were recorded. The data set  
contains these pairs of observations (count followed by temperature).

These data courtesy of Dr. Marie Davidian at NC State University.