"As If" analysis Part 2

"Fashion sector bellwether Next unveils full-year figures next week, and much of the focus is likely to be on recent trading performance.
Bad weather has hit clothing groups..."

It's amazing that the planning done in these businesses is so finely tuned that something as utterly unexpected as a smattering of snow in March can upset the applecart isn't it ;-)
You might expect that a bit of cold weather in March would help clear the remaining Winter merchandise...

...and of course, if we don't venture out to buy Summer merchandise in March due to a bit of bad weather, most of us decide not to bother with the new season at all don't we ;-)

Is the logical deduction from all this that UK Retail forecasting is hopelessly optimistic and totally fails to take into account banal and predictable events like a spot of bad weather?

Or is it that unrealistic pressure from the city forces retailers into making these unrealistic and undeliverable forecasts in the first place?