Fertility treatment success rates can vary with seasons, and some studies suggest that summer may have a positive impact on conception. Research indicates that sperm quality tends to improve in warmer months, with higher motility and concentration.

A study published in Chronobiology International found that IVF success rates were slightly higher in summer, possibly due to increased vitamin D levels, which enhance reproductive health. Some clinics report a 2-3% rise in pregnancy rates during summer cycles. While seasonal effects are not the sole factor, lifestyle changes, reduced stress, and better hormonal balance in summer may contribute to improved outcomes.