And the Pocket Guide to the Empire: First Edition:
With these two clear accounts in hand and with the knowledge that no author could possibly mistake the climate of his home province, which is right outside his window, people were shocked and horrified when the developers of the Elder Scrolls Online claimed:
"What nonsense!!!" The community cried. How could an Imperials mistake the climate of their own province!?? Errors by Imperial scholars are well documented (such as the laughable claim that the Hist are a strain of Argonian) but an error such as this is beyond the realm of possibility.
Moreover, we already have a much better explanation:
Tiber Septim used the power of CHIM to reshape the land into a climate more favored by his people. This explanation was confirmed twice by in-game texts. First, the Mythic Dawn Commentaries:
Next, by the prophet Heimskr in Skyrim:
So why would the developers abandon this perfectly good explanation in favor of a unbelievable and boring one? This is where the confusion began. The "transcription error" is not in the Pocket Guide nor is it in the Provinces of Tamriel. The transcription error was on an Elder Scroll.
Elder Scrolls contain all knowledge of how things are, how they were, and how they will be. Yet, what is written can be changed. The future is not set in stone. Nor, it would appear, is the past. Talos Stormcrown, master of the Mundus, saw the transcription error on the Elder Scroll. "Cyrodiil is an endless jungle'....this cannot be," said Tiber. Using his mighty pink metaphysical-eraser and his powerful elder-pencil, Talos re-wrote the Elder Scroll. This change occurred past, present, and future. The famous line about 'breathing in royalty' of course refers to Talos blowing away his eraser shavings.
So you see, its was all a big misunderstanding. There is nothing to be upset about. All is as it should be.
PS:
There is apparently some fool scholar claiming that the transcription error was indeed on the Pocket Guide:
This fool, of course, should be ignored. His ramblings are merely an example of the frailty of the human mind. A person of such low intelligence cannot possibly be expected to comprehend the power and significance of the Elder Scrolls.