I have read the manual but it is sparse about weather effects. In the Caesar-Pompeii campaign of AJE, I have noted that in Winter months, if I move a stack, in addition to some loss of strength expected, there is a complete loss of cohesion. As a result I have to move back and then waste another move or two to regain cohesion, and by that time, it is Summer! And this happens in places like Spain and Turkey, which are not at the North Pole.
Another related thing I have noticed is that during my last move (December I think), all of Greece and most of Turkey were covered in snow. Now I know that Mireille Mathieu had a song that it had snowed in Mykonos, but should it happen every day for four months?
Am I right in supposing that the intent of the game is that troops should stay inside during five months of poor weather and fight only when the sun shines?
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Caesar: All right men, get you gear, we are attacking Pompeii today!
Soldier: No way Jose! It is cold, it is raining cats and dogs, and my rheumatism is acting up! I signed up in Southern Italy, so buzz off and go ask some of those Germanic tribes who are used to sleeping on wet ground.