Days Until Winter

Calculate how many days remain until winter begins.

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Enter your values and click Calculate

Winter begins on the winter solstice, approximately December 21st — the shortest day of the year when nighttime is at its longest. Knowing how many days remain until winter matters for ski resort operators planning their season opening, homeowners scheduling furnace inspections and weatherisation work, retailers timing their winter clothing arrivals, and travellers booking cold-weather destinations. This calculator reads today's date automatically and counts forward to December 21st of the current or next year as appropriate. The result refreshes on every page load so it always reflects today's accurate countdown.

How It Works

The calculator reads today's date with JavaScript's new Date() and constructs a target set to December 21 of the current year — month index 11 in JavaScript's zero-indexed system. If today is already past December 21, the year is incremented so the countdown always points to the next occurrence. The difference between the target and now is measured in milliseconds, divided by 86,400,000, and rounded up with Math.ceil so that any partial remaining day counts as a full day.

Examples

Early December
Running the calculator on December 1st.
Result: Shows approximately 20 days until winter.
Day After Winter Starts
Running the calculator on December 22nd.
Result: Shows approximately 364 days until next winter.
Early Autumn
Running the calculator on September 22nd.
Result: Shows approximately 90 days until winter.

Frequently Asked Questions

When does winter officially begin?
Winter begins on the winter solstice, which falls around December 20th, 21st, or 22nd each year in the Northern Hemisphere. This calculator uses December 21st as a consistent fixed approximation.
Is the winter solstice always December 21st?
Not always — it can fall on December 20th, 21st, or 22nd depending on the year and time zone. The exact moment varies because the calendar year does not perfectly match Earth's orbital period, but the 21st is the most common date.
Does this work for the Southern Hemisphere?
No. In the Southern Hemisphere, winter begins around June 21st — the Northern Hemisphere's summer solstice. This calculator is calibrated for Northern Hemisphere users only.

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