Very large close lightning bolts striking in the sky with a lightning bolt that appears to be smaller but mighty in the distance of the agriculture farming fields of east Boulder County Colorado. July 15th, 2014 10:53 pm - ISO 500 - f5.6 - 30 sec - 16mm - Canon 6D Full Frame. The average lightning strike is six miles long. A cloud-to-ground lightning channel can be 2 to 10 miles long. Voltage in a cloud-to-ground strike is 100 million to 1 billion volts. Colorado fine art nature landscape weather photography.