So far, August of 2004 has been one of the coolest on record. Overall, the summer is among the top 10 coolest summers on record in Arkansas, but it`s sitting low at Number 8 on the chart. The first half of this month is in the top spot for the coolest first-half-of-August on record. The average temperature for the first 16 days of August was only 75.6. A high-pressure system headed toward Arkansas is expected to bring changes with higher temperatures and more humidity.