Hi Mr. Wood, this is Breanna from period 4 I would expect the CO2 level to go up because the decomposers and the snow and the permafrost is releasing the CO2. The weather does affect it because it depends on how cold, hot, sunny, or dark it is in the sky. Then you will get your result from there. For example, if it's dark then there would be more CO2 because there is no sun. Any way, have fun!!