How common are December birthdays?
- 10,991births per day#7 of 12 months
- 8.3%of all births in the sample7,155,101 recorded
- December 20most common December date#11 of 366
- December 25quietest date that occurs every year#365 of 366
December is the 7th most common birth month of the 12, at 10,991 recorded births per day, 1.6% below an average day across 85,712,738 U.S. births from 1994–2014. Its most common date is December 20 (#11 of 366) and its quietest date that occurs every year is December 25 (#365).
Every date is coloured by the same six rarity tiers the reveal uses; the small number is its rank of 366 from most common.
- 1#137
- 2#148
- 3#166
- 4#224
- 5#167
- 6#234
- 7#320
- 8#274
- 9#290
- 10#233
- 11#264
- 12#99
- 13#286
- 14#240
- 15#150
- 16#111
- 17#93
- 18#52
- 19#17
- 20#11
- 21#54
- 22#107
- 23#351
- 24#363
- 25#365
- 26#360
- 27#56
- 28#28
- 29#16
- 30#23
- 31#348
Every December date: recorded U.S. births 1994–2014
One column per December date in calendar order, coloured by rarity tier, total recorded births 1994–2014.
Every December date, ranked
Ranked by total recorded births across the 21 years, the same measure as the site-wide rank of 366.
| Date | Total births | Rank of 366 | Odds | |
|---|---|---|---|---|
| December 20 | 253,354 | #11 | 1 in 338 | |
| December 29 | 252,082 | #16 | 1 in 340 | |
| December 19 | 251,948 | #17 | 1 in 340 | |
| December 30 | 250,577 | #23 | 1 in 342 | |
| December 28 | 249,921 | #28 | 1 in 343 | |
| December 18 | 246,454 | #52 | 1 in 348 | |
| December 21 | 246,261 | #54 | 1 in 348 | |
| December 27 | 246,214 | #56 | 1 in 348 | |
| December 17 | 242,325 | #93 | 1 in 354 | |
| December 12 | 241,615 | #99 | 1 in 355 | |
| December 22 | 240,078 | #107 | 1 in 357 | |
| December 16 | 239,301 | #111 | 1 in 358 | |
| December 1 | 237,160 | #137 | 1 in 361 | |
| December 2 | 235,990 | #148 | 1 in 363 | |
| December 15 | 235,882 | #150 | 1 in 363 | |
| December 3 | 235,077 | #166 | 1 in 365 | |
| December 5 | 234,986 | #167 | 1 in 365 | |
| December 4 | 231,793 | #224 | 1 in 370 | |
| December 10 | 231,087 | #233 | 1 in 371 | |
| December 6 | 231,084 | #234 | 1 in 371 | |
| December 14 | 230,859 | #240 | 1 in 371 | |
| December 11 | 229,817 | #264 | 1 in 373 | |
| December 8 | 229,572 | #274 | 1 in 373 | |
| December 13 | 228,959 | #286 | 1 in 374 | |
| December 9 | 228,743 | #290 | 1 in 375 | |
| December 7 | 226,439 | #320 | 1 in 379 | |
| December 31 | 219,101 | #348 | 1 in 391 | |
| December 23 | 218,051 | #351 | 1 in 393 | |
| December 26 | 201,577 | #360 | 1 in 425 | |
| December 24 | 170,166 | #363 | 1 in 504 | |
| December 25 | 138,628 | #365 | 1 in 618 |
December in the year
December has 8.35% of all recorded births in this sample, over 651 observed days. Months are ranked by births per day. On that measure December is #7 of 12, against September at the top (11,811 per day) and January at the bottom (10,721). Full month ranking.
Keep going
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Sources, method and limits
Main ranking: 85,712,738 recorded U.S. births on 7,670 calendar dates, 1994–2014. CDC/NCHS daily counts for 1994–1999 and Social Security Administration daily counts for 2000–2014, as compiled by FiveThirtyEight and attributed under CC BY 4.0. The overlapping years 2000–2003 are counted once.
Ranks compare totals across the 366 observed month-and-day dates. February 29 occurred 5 times in this window; every other date occurred 21 times, so per-occurrence figures are used wherever seasonality is compared.
Every figure above comes from the administrative records named here, at the granularity those records publish: a day, a month or a year. Coverage and definitions differ between countries and eras, so two sources are combined only where their documentation states the windows are separate, and the page where that happens says so.
Full method, leap-day treatment and definitions.
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