Abstract
Summary The relationship between season of birth and intelligence was examined in a sample of children with significant learning disabilities. Sixty subjects born in May-October were compared with 60 subjects born in November-April and were found to have significantly higher mean IQ as measured by the WISC Full Scale. Within the range 35 to 70 degrees, IQ varied linearly with mean temperature of birth month, with subjects born in warm months exhibiting higher intelligence than those born in cold months. Intelligence was not significantly related to infant mortality figures for birth month. The effects of temperature and humidity upon neonatal cortex development are offered as a possible explanation of the differences noted.
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