Two or three weeks? Hell, most of the time they can’t get it right within two or three DAYS. I can’t even count the number of times I’ve canceled weekend plans because the forecast I saw on Wednesday was dead wrong.
“Wrong” is a very imprecise term.
Did they say it was going to be -90 degrees and it was 65?
In other words, they were off by a certain amount. All forecasts have uncertainty, and you’re saying that the precision and accuracy didn’t meet your standards.