The start of summer depends on which definition you use: (based on Earth’s orbit) or meteorological (based on annual temperature cycles).
For most people in the Northern Hemisphere, is universally recognized as the month summer starts. Whether you pop the cork on June 1st (weather-wise) or wait for the solstice around June 21st (sun-wise), the season of sun has officially arrived what month does summer start
Because the temperature lag causes the hottest days to happen after the solstice, meteorologists split the year into neat, three-month chunks to make record-keeping easier. The start of summer depends on which definition
Summer begins on the December Solstice . This usually falls on December 21 or 22 . meteorologists split the year into neat