Scientifically informed climate policymaking starts with the exchange of credible, salient, and legitimate scientific information between scientists and policymakers. It is therefore important to understand what explains the exchange of scientific information in national climate policymaking processes. This article applies exponential random graph models to network data from the Czech Republic, Finland, Ireland, and Portugal to investigate which types of organizations are favored sources of scientific information and whether actors obtain scientific information from those with similar beliefs as their own. Results show that scientific organizations are favored sources in all countries, while only in the Czech Republic do actors obtain scientific information from those with similar policy beliefs. These findings suggest that actors involved in climate policymaking mostly look to scientific organizations for information, but that in polarized contexts where there is a presence of influential denialists overcoming biased information exchange is a challenge.