We have "on Monday" for 1 occasion & "on Mondays" for repeated events, can we have similar patterns for "in July" or "in Winter"?

According to Cambridge Dictionary,

with a singular day of the week to refer to one occasion:

I’ve got to go to London on Friday.

with a plural day of the week to refer to repeated events:

The office is closed on Fridays. (every Friday) In informal situations, we often leave out on before plural days:

Do you work Saturdays?

I’ve got to go to London on Friday.=I’ve got to go to London this/next Friday.

The office is closed on Fridays.=The office is closed every Friday.

However, I would think that "in July" or "in Winter" can be used for both cases "one occasion" & "repeated events", but I am not so sure.

Example 1:

  • I’ve got to go to London in July.=I’ve got to go to London this July.
  • The office is closed in July.=The office is closed every July.

Example 2:

  • I’ve got to go to London in Winter.=I’ve got to go to London this Winter.
  • The office is closed in Winter.=The office is closed every Winter.

We have "on Monday" for 1 occasion & "on Mondays" for repeated events, can we have similar patterns for "in July" or "in Winter"?

For example, can we say the following?

  • The office is closed in Winters / in Julies.=The office is closed every Winter / every July.

The rules work rather differently for months and seasons.

Months.

The golf course is closed in/during January could mean every January or just the next forthcoming January. To be absolutely clear one would need to say either ...is closed every January/is always closed in/during January; or ...is closed this/next January.

Seasons

The golf course is closed in/during winter means every winter. The golf course is closed this/next winter - means only this year.