Answer:
One possible explanation for the difference in the amount of Ca(OH)₂ collected between winter and summer is that temperature affects the solubility of Ca(OH)₂ in water. At higher temperatures, the solubility of Ca(OH)₂ increases, meaning that more of it will dissolve in the water instead of precipitating out as a solid during the reaction.
Therefore, if the reaction was carried out under the same conditions in both winter and summer, but the temperature was significantly different, it is possible that less Ca(OH)₂ was collected in the summer because more of it remained dissolved in the water rather than precipitating out as a solid.
Other factors such as changes in humidity or air pressure could also potentially affect the outcome of the reaction, but temperature is likely to have the biggest impact on the solubility of Ca(OH)₂.