Great question Doug, there are 2 of each of the 5 arrow levels, plus one "Thunderstorm" where there are NO sales (below the 5th level), plus one "Heat Wave" card where it is on the top level AND the card itself is pretty much guaranteed to make everyone money. Basically 1 in 5 chance of each level plus one below 1 and one above 5. Since only 7 of the 12 cards are played out and only 8 of the 12 are revealed you have some idea of what is coming but still don't know for sure. More strategic guessing than just some dice role. It works REALLY well in practice and the playtesting on this game was very positive and quite extensive!