If the trend is correct and is -3.57 after 18 days and it is done on the calendar month 31 days it would have to push up to a stonking 4.95 for the remaining 13 days to bring the average out to zero.
Looking forward to seeing if this theory delivers a 2 month, (as a minimum!) colder than average winter.
Just a quick thanks to the usual suspects for their input, nice to see Steve back on form!
Clem