Based on research, the months with the lowest average IQ are January to March.
Research Findings on Birth Month and IQ
Studies have explored the connection between birth month and various cognitive and developmental outcomes. Specifically, one study in 1929 by Blonsky (5) indicated that children born in spring had the highest mean IQ. However, Pintner (13) later researched 4925 cases and found a slightly different result.
Here’s a summary of the key findings:
| Researcher(s) | Year | Findings |
|---|---|---|
| Blonsky (5) | 1929 | Children born in spring had the highest mean IQ. |
| Pintner (13) | 1929 | Children born in the winter months, January to March, had the lowest mean IQ. |
Analyzing the IQ Variance
While there were variations in mean IQ based on birth months, the difference was relatively small. Pintner (13) reported the greatest seasonal difference was only 1.7 IQ points. Despite this small difference, the finding was considered statistically reliable, suggesting a genuine trend, although not a major one.
Key Observations:
- The lowest IQ average is associated with winter births.
- The specific months are January, February, and March.
- The seasonal variance in IQ is relatively small, only 1.7 points.
- The small variance is still statistically significant.
Practical Insights
It's important to note that these findings represent population trends and do not predict an individual's IQ. Many other factors, including genetics, environment, and education, play a crucial role in determining someone's IQ. Therefore, a person's birth month is only one small factor in this complex picture.
