A powerful cold front brought temperatures crashing down during the early morning hours across the state today. Temperatures fell 36 degrees in a 13 hour period. The drop was even greater in some parts of the state where temperatures fell as much as 45 degrees over the same 13 hour period. At 6am this morning, the temperature was 53 and by 7pm this evening, the temperature was 17. The graph is from my own weather station and you can see the progression of the drop.
This isn't the largest temperature drop recorded in the state though. The greatest single day temperature drop was in 1916 when the temperature went from a high of 68 to a low of 10. Source: Indianapolis NWS