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Your symptoms are consistent with a failed battery. The lights to illuminate the interior only require about 3 amps to power up. The starter draws over 100 amps to crank the motor. If the charging system light (symbol of a battery) was not on when you last ran it, the cause is likely a failed battery. This time of year when the temperature turns cold, a battery's performance is reduced and often "pushes them over the edge" so to speak.
I suggest you "jump start" the vehicle. If the charging system light works (battery symbol illuminates with key on, extinguishes once engine starts, and remains off), and vehicle starts and runs normally for the day, and restarts once the battery has had time to charge. The battery has likely failed.
This condition should be confirmed with a battery and charging system check, as well as a "parasitic draw" test to verify the integrity of the system. If you wanted to take a chance and replace the battery without any further testing, it may correct the condition, but if the symptom were to return after a few days, the above described tests would be mandated in order to determine the actual cause.
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Jake "The Audi Doctor"