The summer solstice marks the beginning of summer astronomically just as the winter solstice marks the beginning of astronomical winter.<p>Midsummer is celebrated on the longest day in some cultures, on the solstice in others, but does not denote the middle of astronomical summer.<p>Meteorologic summer and winter currently begin weeks before the solstice.  <a href="https:&#x2F;&#x2F;www.ncdc.noaa.gov&#x2F;news&#x2F;meteorological-versus-astronomical-summer%E2%80%94what%E2%80%99s-difference" rel="nofollow">https:&#x2F;&#x2F;www.ncdc.noaa.gov&#x2F;news&#x2F;meteorological-versus-astrono...</a> has a discussion on the difference.