Eratic Temp Readings

I was having Illegal Operation Errors on WD, after running great since I started running it for several months, so I upgraded to 10.12q and now I am having Temperature readings that are 6-10 Degrees High. I have not noticed any other readings being off.
Does anyone have any ideas on where to look for the problem? I have tried different “Data Length” and other settings, but no luck.
I will say the readings are correct for a minute or two, then the temp jumps the 6-10 degrees. Sometimes it varies 2-3 degrees in a 1-2 minute time frame before making the big jump. Restart the program, and it happens all over again.

I am running Window 98,and have a Peet Ultimeter 500.

I also have never been able to get the rain guage to work, but the Temp problem is my priority.

Any help would be greatly appreciated!
Thanks!
Andy

hi
email me your settings files,
wdisplay.ini
from c:\windows or c:\winnt
and
wdisplayftp.reg
from the folder databackup, after going, action, back up registry now (in WD)

Hi
it says ultimeter II across the top of the program when i started with your settings
i.e you need to select a ultimeter 500 as the weather station type
and then restart wd
try that