As we approach September the thoughts of when the first frost of the season may occur tends to come up in many of my conversations. Average first frost varies anywhere from mid September to the very early September. The early frosts usually occur in northwestern and northeastern North Dakota and on average the latest frost dates are generally in the southern Red River Valley. Looking beyond the typical 10-14 day outlook, currently there appears to be indications that in the September 15-20th range an air mass may invade north Dakota that would be strong enough to bring low to mid 30s temperatures to at least some parts of the region. About right on schedule if true.