With the temp in single digits 8.5 volts is only a bit high for a 6 volt generator system.
Keep in mind also as the generator/VR warm up to "normal" temps the output voltage will drop by as much as a volt or so. Also under extreme cold it takes extra voltage to recharge the battery.
I'd say long as the ammeter indicates 10 - 12 amps or less while charging I wouldn't be concerned.
Also as JimN suggests below double check your DVM against a known good analog meter! Reason is even many "good" DVM's give inaccurate readings when confronted with the electrical noise in old tractor electrics.
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