Dear Malsatpoole and WeatherCat faithful,
Since this is your first posting on the WeatherCat forum, by all means welcome!

With regards to the rain and temperature columns;
How do I enter the average rainfall and temperature for each month.
This is needed in order for the report to show any deviation from the normal.
I have tried searching without success.
I don't believe WeatherCat provides a way to enter the averages. The problem with trying to do this is that you would need averages for your particular weather station. Most of us are too far away from any established data collection stations to be able to use those averages and even our longest running stations don't have enough data to really provide reasonable estimates of the averages.
Is your station an exception and you do have trustworthy average values from some source?
Cheers, Edouard