Home > Publications . Search All . Browse All . Country . Browse PSC Pubs . PSC Report Series

PSC In The News

RSS Feed icon

Shaefer and Edin's book ($2 a Day) cited in piece on political debate over plight of impoverished Americans

Eisenberg tracks factors affecting both mental health and athletic/academic performance among college athletes

Shapiro says Americans' low spending reflects "cruel lesson" about the dangers of debt

Highlights

Susan Murphy elected to the National Academy of Sciences

Maggie Levenstein named director of ISR's Inter-university Consortium for Political and Social Research

Arline Geronimus receives 2016 Harold R. Johnson Diversity Service Award

PSC spring 2016 newsletter: Kristin Seefeldt, Brady West, newly funded projects, ISR Runs for Bob, and more

Next Brown Bag

PSC Brown Bags
will resume fall 2016

David Lam photo

Temperature and the Seasonality of Births

Publication Abstract

Lam, David, and Jeffrey A. Miron. 1991. "Temperature and the Seasonality of Births." In Temperature and Environmental Effects on the Testis edited by A.W. Zorgnoitti. Pp. 73-88. New York, NY: Plenum Press.

This paper considers the relation between temperature and the seasonal fluctuations in births. There is significant seasonality in births in every population for which data are available, and the presence of a seasonal pattern in any activity strongly suggests the influence of temperature. The differences in seasonal patterns across countries, however, provide at best ambiguous support for any temperature based explanation of birth seasonality. Thus, while temperature is probably one important factor in determining birth seasonality, it is clear that other factors are also at work. The paper has two purposes. The first is to survey existing evidence on the relation between temperature and the seasonality of births. The second is to provide new evidence on possible effects of temperature on fertility by using actual monthly temperature data to estimate temperature's direct contribution in explaining the seasonal variation in monthly births. Results show that temperature does have a quantitatively important influence on the seasonal variation in births in most of the populations considered. In particular, there is a consistent tendency for temperature to depress summer time conceptions. Even after controlling for the effects of temperature, however, there is still significant seasonality in births in all populations, specifically a global spring peak, a local September peak, and a global winter trough. Thus, controlling for the effects of temperature resolves some of the cross country differences in birth seasonality, but it does not fully explain this seasonality. There is clearly some other variable or combination of variables influencing seasonal fluctuations in births.

Browse | Search : All Pubs | Next