That appears to be a possibility in light of this latest science news:
Researchers studied 400 people and matched their personality type to the season when they were born. The scientists claim people born at particular times of the year have a greater chance of developing certain personality traits. They said this was because the seasons had an affect on certain chemical substances in the brain, such as dopamine and serotonin, which control mood. They discovered that babies born in the summer were much more likely to suffer mood swings when they grow up.
In contrast, those born in spring tended to be excessively positive, upbeat and optimistic. They also found that those born in the autumn were less likely to be depressive, while winter babies were less likely to be irritable.
As the scientific research progresses, it would be interesting to map these “chemically generated seasonal personality types” to the various astrological signs and see how well they match. It would certainly be amusing to see the expression on the faces of various science fetishists upon learning that they were henceforth to be deprived of one of their favorite rhetorical devices.