I am in Ottawa, Canada, so not sure if the country is causing a lookup problem. My baseline is 2.82mm (0.111 inches) and has not been hot or dry here. Just barely getting into the 70s during the day and mid 40s at night.
I am a coder so if you can point me to the code I can take a peek on how it is working and may have some ideas.
Also, not sure if you are interested, but this was my previous version. Back when I wrote it, nobody published daily ET or even solar radiation so I had to compute it based on historical cloud cover and math. Maybe that has changed in the last 4 years.