There are 4 seasons, and they always refer to a certain set of calendar months about calendar_fallacies HOT 3 OPEN

Also note that a single "Calendar" year has multiple summers, since in New Zealand, Summer is December-February. So "Summer 2018" could mean "Jan-Feb 2018" or December 2018. It can also be May to August/September or June to September.

There is also "astronomical summer" which starts at the solstice (Which is either ~20-22nd of June or ~21-22nd of December) vs "meteorological summer".
Of course, different countries have different definitions of various seasons and when they happen etc.

Tech companies love to say "Coming season " or "Coming this/next "! Which is of course confusing, given the above.

Also, some calendars have more than 4 seasons! Apparently Hindu calendars have six different seasons!

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And "this summer" could mean you haven't updated the Web page for 8 months. "this summer" isn't a date.

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And "this summer" could mean you haven't updated the Web page for 8 months. "this summer" isn't a date.

That applies to any kind of relative specification though. If I say something will happen in two months time that info will be outdated immediately if it isn't possible to tell when I said it.

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