My car battery goes dead when it is wet outside, otherwise it is fine. What might cause this?

1999 CHEVROLET LUMINA
140 MILES
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KAFFAFFIE
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Today it was raining/snowing and I went out after my car was sitting overnight and the car started...I drove to the store, about 10 minutes, shopped and the car battery was dead. After a jump start I let the car run for a while, went home (about 20 minutes running) turned off the car and it would not start again..any ideas?
Mar 4, 2012 at 5:39 AM
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CARADIODOC
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Start by measuring the battery voltage with the engine off and with it running. All you need is an inexpensive digital voltmeter. Harbor Freight Tools has them for $5.99 and often on sale for $2.99. Holler back with those numbers to at least one decimal point.
Mar 4, 2012 at 7:07 AM