Capitalization: Days of the week, months of the year, and holidays (but not the seasons)
Days, months, and holidays are always capitalized as these are proper nouns. Seasons aren’t generally capitalized unless they’re personified.
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The gardener comes on Tuesdays and Fridays.
My doctor’s appointment is on Monday afternoon.
Your birthday is in March, right?
Thanksgiving in November, Christmas in December, and New Year’s in January: North America has a lot of winter holidays.
The seasons aren’t capitalized unless they’re being used as a proper noun, such as when personified in creative writing or poetry. Consider the sentences below:
My favorite season is autumn.
Many animals hibernate in the winter.
It’s that time of year again, when Winter blankets all creatures with somniferous snow and whispers to them, “Rest, children, rest.”
Generally speaking, the days of the week and months of the year are capitalized, but there are exceptions to this rule.
