What Your Birth Month Secretly Says About You

How the months got their characters

The twelve names on your calendar are Roman leftovers. January belongs to Janus, god of doorways and beginnings; March to Mars; June, most probably, to Juno. July and August were renamed to flatter Julius Caesar and Augustus. September through December still count from March, which is why the ninth month carries a word meaning seventh: the year once began elsewhere and nobody renumbered the tail.

Personality came later. Almanacs sold on street corners paired each month with a stone, a flower and a temperament, and Victorian gift books turned that into a whole language: the January carnation, the amethyst, the sturdy but chilly winter child. Newspaper columns kept it going, and it slid neatly into the birthday posts we still scroll past. None came from watching actual babies; they were arranged for symmetry, so that every month ended up with a virtue no other month had claimed.

What survives underneath is a habit of thinking in seasons. Ask someone born in November about their birthdays and you will usually get weather in the answer: dark afternoons, wet coats, cake eaten indoors. The month is a container for a particular set of childhood memories, and much of what a reading picks up is that.

The small, stubborn effects that are real

One birth-date pattern does keep showing up in data, and it has nothing to do with character. In 1985 Roger Barnsley and colleagues noticed that elite Canadian junior hockey squads were stuffed with players born in January, February and March. The cause was administrative: age groups were cut at 1 January, so the oldest in each cohort were bigger, got picked more often and trained more. English football shows the same skew towards September, tracking the school-year cut-off. It is a selection artefact, worth knowing because from the inside it looks exactly like destiny.

Season-of-birth research turns up fainter signals: modest associations with short-sightedness, some allergies, and a slight winter excess in schizophrenia diagnoses, usually pinned on maternal infection or vitamin D. Those are population-level whispers, visible across hundreds of thousands of records and invisible in one person.

Which leaves the reading below doing what these things do best. In 1948 Bertram Forer handed a class the same vague sketch, told each student it was theirs alone, and watched them rate it 4.26 out of 5 for accuracy. Generous, faintly contradictory descriptions fit almost everybody. Knowing that does not spoil the fun; it moves the pleasure to where it lives, which is recognising yourself rather than being diagnosed.