How common are January birthdays?
- 10,721births per day#12 of 12 months
- 8.1%of all births in the sample6,979,322 recorded
- January 24most common January date#200 of 366
- January 1quietest date that occurs every year#364 of 366
January is the least common birth month of the 12, at 10,721 recorded births per day, 4.1% below an average day across 85,712,738 U.S. births from 1994–2014. Its most common date is January 24 (#200 of 366) and its quietest date that occurs every year is January 1 (#364).
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#364
- 2#361
- 3#301
- 4#207
- 5#241
- 6#268
- 7#254
- 8#343
- 9#339
- 10#205
- 11#227
- 12#247
- 13#342
- 14#230
- 15#346
- 16#340
- 17#258
- 18#279
- 19#330
- 20#303
- 21#302
- 22#334
- 23#283
- 24#200
- 25#238
- 26#296
- 27#305
- 28#297
- 29#345
- 30#319
- 31#278
Every January date: recorded U.S. births 1994–2014
One column per January date in calendar order, coloured by rarity tier, total recorded births 1994–2014.
Every January 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 | |
|---|---|---|---|---|
| January 24 | 233,021 | #200 | 1 in 368 | |
| January 10 | 232,521 | #205 | 1 in 369 | |
| January 4 | 232,354 | #207 | 1 in 369 | |
| January 11 | 231,414 | #227 | 1 in 370 | |
| January 14 | 231,343 | #230 | 1 in 371 | |
| January 25 | 230,897 | #238 | 1 in 371 | |
| January 5 | 230,826 | #241 | 1 in 371 | |
| January 12 | 230,499 | #247 | 1 in 372 | |
| January 7 | 230,233 | #254 | 1 in 372 | |
| January 17 | 230,038 | #258 | 1 in 373 | |
| January 6 | 229,776 | #268 | 1 in 373 | |
| January 31 | 229,472 | #278 | 1 in 374 | |
| January 18 | 229,465 | #279 | 1 in 374 | |
| January 23 | 229,163 | #283 | 1 in 374 | |
| January 26 | 228,394 | #296 | 1 in 375 | |
| January 28 | 228,365 | #297 | 1 in 375 | |
| January 3 | 228,259 | #301 | 1 in 376 | |
| January 21 | 228,190 | #302 | 1 in 376 | |
| January 20 | 228,138 | #303 | 1 in 376 | |
| January 27 | 228,012 | #305 | 1 in 376 | |
| January 30 | 226,669 | #319 | 1 in 378 | |
| January 19 | 225,387 | #330 | 1 in 380 | |
| January 22 | 225,098 | #334 | 1 in 381 | |
| January 9 | 224,116 | #339 | 1 in 382 | |
| January 16 | 224,055 | #340 | 1 in 383 | |
| January 13 | 223,803 | #342 | 1 in 383 | |
| January 8 | 223,766 | #343 | 1 in 383 | |
| January 29 | 222,831 | #345 | 1 in 385 | |
| January 15 | 222,374 | #346 | 1 in 385 | |
| January 2 | 196,481 | #361 | 1 in 436 | |
| January 1 | 164,362 | #364 | 1 in 521 |
January in the year
January has 8.14% of all recorded births in this sample, over 651 observed days. Months are ranked by births per day. On that measure it is last of the 12; September is at the top (11,811 per day). 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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