| 100% | IMPS | 4 | The IETF, issuer of April Fool's Day RFCs since 1978, issued this RFC on April 1, 2000 (abbr.) |
| 45% | IMPS | 4 | 2000 April Fool's Day RFC issued by the Internet Society about the practicalities of the infinite monkey theorem |
| 29% | WORLDSTALLESTSKYSCRAPER | 23 | The subject of this puzzle, on 5/1/31, the day it opened |
| 26% | GOLDRINGS | 9 | These were received on the fifth day of Christmas |
| 26% | LEAVEITTOBEAVER | 15 | This and Sputnik 1 were launched on the same day |
| 26% | MON | 3 | Day of the week that Presidents' Day falls on: Abbr. |
| 26% | DANCING | 7 | The ladies were doing this on 9th day of Christmas |
| 26% | WED | 3 | Day of the wk. on which this puzzle was released |
| 25% | OCTOBER | 7 | Halloween is on the last day of this month |
| 25% | GOLDRINGS | 9 | On the fifth day, my true love gave me 5 of these |
| 25% | MENORAH | 7 | Candles on this are lit on the days of Hanukkah |
| 25% | APRIL | 5 | You may get fooled on the first of this month |
| 25% | APRILFOOL | 9 | Cry heard on April Fool's Day |
| 24% | USCENSUS | 8 | Once-per-decade count tabulated on the first day of April (and certainly not a prank) |
| 24% | BIRDS | 5 | On the fourth day of Christmas, your true love may send you these four calling "avians" |
| 24% | RINGS | 5 | On the fifth day of Christmas, your true love may send you these five "engagement pieces" |
| 24% | TUE | 3 | Day this week when BAS was at 1-Across for the Atlantic crossword: abbr. |
| 24% | PRANK | 5 | BIT OF APRIL FOOLS' DAY FOOLERY |
| 24% | TUE | 3 | 2/22/2022 aptly fell on this day of the week, for short |
| 24% | WED | 3 | Day the tenth anniversary of Rebecca Black's "Friday" was celebrated, oddly: abbr. |
| 24% | GMAIL | 5 | Service launched on April Fool's Day in 2004 |
| 24% | SALT | 4 | It may replace sugar, on April Fool's Day |
| 24% | HOAX | 4 | Fake news article on April Fool's Day, say |
| 24% | PRANKS | 6 | Plays practical jokes on April Fool's Day, say |
| 24% | PIZZA | 5 | About 1 in 8 Americans eat this food on any given day, per a Department of Agriculture study |
| 24% | TURTLE | 6 | On the second day of Christmas, your true love may send you these two doves that may "snap" |
| 24% | FRENCH | 6 | On the third day of Christmas, your true love may send you these three hens from Paris, perhaps |
| 24% | THU | 3 | Thanksgiving's day of the week: Abbr. |
| 24% | AGE | 3 | Donald Trump was indeed the greatest president in terms of this on Inauguration Day |
| 24% | ARIES | 5 | Zodiac sign for babies born on April Fool's Day |