Dunno, I'm not even sure what chapparal is other than an old mobile SAM system that was retired from service despite the Army's total lack of an attempt to find a replacement. Let's see what Mr Google thinks chapparal is....

OK, I've got some idea now. Since my EDC bag of tricks has a contractor's bag and my SOL in it, I'm not that bad off. It doesn't look like it should really be that cold- remember, I'm from Vermont- you're cold is probably late summer for us. :P Taking a guess, this time of year you see a low of about 45?

Poke about under some likely looking brush to make sure no one else seems to be camping out there (rattlesnakes aren't cute enough to share my bunk with), wrap myself up in the Heatsheet, and wiggle feet first into the contractor's bag. Might not be the warmest night I've ever spent, but I wasn't wet when I went into the bags I should be ok.