The top of the orange bar would be the record high temperature for that day, and the bottom would be the lowest high temperature ever recorded for that day. Similarly, the blue bars show the range of daily low temperatures . The bottom of the blue bar would be the record low temperature, while the top would be the highest low temperature ever recorded for that day. We can also see that there's only been one recorded freeze ever in the month of October in Gainesville. By November the average high is in the 70's and the average low is in the 50's.
Freezes are much more common and there are instances of severe cold, as well.
There's even been one day in December when the high temperature was only in the 20's. This graph shows that the average high temperature stays in the 60's until about mid-February, while the average low remains in the 40's until early March. Low temperatures into the teens have been recorded as late as the end of February, and hard freezes can occur as late as the first day of Spring. With only a handful of exceptions, the high temperature in January and February always reaches into the 40's. By the end of March, the average high temperature is around 80.