They used large national datasets and performed some clever analysis to explore the effects of being born in different months on school attainment, wellbeing, university attendance and employment. (thenferblog.org)
Interestingly, when I looked at different months of the year, I found that the nighttime warming was even greater during the summer. (climatecentral.org)
So the difference in CO2 - rise for different months is tiny. (realclimate.org)