Week Number December 2025
Calculate and view week numbers for the year or a specific month. Select different standards to see how they compare.
ISO 8601 standard: Weeks start on Monday, and the first week of the year contains the first Thursday.
| Week | Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|---|
| Week 48 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Week 49 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| Week 50 | 15 | 16 | 17 | 18 | 19 | 20 | 21 |
| Week 51 | 22 | 23 | 24 | 25 | 26 | 27 | 28 |
| Week 52 | 29 | 30 | 31 | 1 | 2 | 3 | 4 |
Exploring the December 2025 Calendar
The calendar for December 2025 is structured across 5 weeks. This view helps in detailed monthly planning, from tracking project milestones to scheduling personal appointments. The week numbers, determined by the ISO 8601 standard, provide a clear framework.
Frequently Asked Questions for December 2025
How many weeks are in December 2025?
December 2025 has 4 complete weeks plus 3 additional days.
December 2025 spans across 5 weeks in total. Note that some weeks may be shared with the previous or next month.
What are the key facts about December 2025?
- Starts on Monday
- 31 days total
- 4 complete weeks + 3 days
- Week numbers determined by the ISO 8601 standard
Does the December 2025 calendar start on Monday?
Whether the calendar starts on a Monday depends on the selected standard. The ISO 8601 standard has weeks starting on a Monday. You can easily switch between standards to see the different layouts.
For December 2025 specifically, the month starts on a Monday.