December 2025 has 31 days
The month opens on a Monday and closes on a Wednesday. It holds 23 working days and 8 weekend days, and covers days 335 to 365 of 2025. It ended 266 days ago.
How many days are in December 2025?
December 2025 has 31 days. Month lengths never change outside February, so December always has 31 days. Of those, 23 fall on a weekday and 8 at a weekend, which is the split before any public holiday is deducted.
What day does December 2025 start on?
1 December 2025 is a Monday and 31 December is a Wednesday. The month spans ISO weeks 49 to 1 and contains 5 Mondays, 4 Fridays, 4 Saturdays and 4 Sundays.
| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| 15 | 16 | 17 | 18 | 19 | 20 | 21 |
| 22 | 23 | 24 | 25 | 26 | 27 | 28 |
| 29 | 30 | 31 |
What is on in December 2025?
| Date | What it is | Kind | Days away |
|---|---|---|---|
| 1 December | December starts | observance | today |
| 1 December | World AIDS Day | observance | today |
| 4 December | Full Moon | sky event | 3 days |
| 10 December | Human Rights Day | observance | 9 days |
| 11 December | Last Quarter | sky event | 10 days |
| 14 December | Geminids peak | sky event | 13 days |
| 20 December | New Moon | sky event | 19 days |
| 21 December | December solstice | astronomical | 20 days |
| 22 December | Ursids peak | sky event | 21 days |
| 24 December | Christmas Eve | observance | 23 days |
| 25 December | Christmas Day | holiday | 24 days |
| 26 December | Boxing Day | holiday | 25 days |
| 27 December | First Quarter | sky event | 26 days |
| 31 December | New Year's Eve | observance | 30 days |
Moon phases in December 2025
| Phase | Date | Weekday | Note |
|---|---|---|---|
| Full Moon | 4 December | Thursday | traditionally the Cold Moon |
| Last Quarter | 11 December | Thursday | instant given in UTC |
| New Moon | 20 December | Saturday | instant given in UTC |
| First Quarter | 27 December | Saturday | instant given in UTC |
Phase instants are computed in Universal Time. A phase falling late in the UTC day can read as the previous calendar date in the Americas, which is why published moon calendars sometimes disagree by one day.
Sky events and season boundaries in December 2025
The december solstice falls in this month, opening winter in the northern hemisphere. Geminids and Ursids peak this month, with the moon waning crescent and waxing crescent on the peak nights. No eclipse is catalogued in it.
How many working days in December 2025?
There are 23 working days in December 2025 on a Monday to Friday week, and 8 weekend days. 2 public holidays from the catalogued countries fall in the month: Christmas Day on 25 December, Boxing Day on 26 December. Whether any of those reduces your own working total depends on which country you are in.
Questions about December 2025
- How many days are in December 2025?
- 31 days.
- What day of the week does December 2025 start on?
- A Monday. It ends on a Wednesday.
- How many working days are in December 2025?
- 23, counting Monday to Friday and not deducting public holidays.
- What holidays are in December 2025?
- Christmas Day, Boxing Day.
- How many weekends are in December 2025?
- 4 Saturdays and 4 Sundays.
Other months
November 2025 · January 2026 · The 2025 calendar year · Every date in 2025