Thirty days has September,
April , June and November
February hath 28,
the odd one that is great;
All the others have 31,
every year it has begun
 

Version 67

30 days hath September
April, June, and November.
All the rest have 31,
save February - the shortest one.
28 is all it stores,
till Leap Year gives it one day more.

30 days has September
April, June and November
All the rest have 31
February has 28 alone
But in every Leap year
That come once in four
February has just 1 day MORE!
 

Version 65

Thirty days hath September,
April, June, and November;
February has twenty-eight alone.
All the rest have thirty-one,
Excepting leap year, that’s the time
When February has twenty-nine

Thirty days hath September,
April, June and November.
All the rest have 31
except February which hath 28
and sometimes 29

30 days hath September
April, June and November
February has 28 alone and
all the rest have 31
Leap year comes once in four
and February has 1 day MORE!
 

Thirty days hath September
April, June, and November
All the rest have 31
Except February on 28 is done
Unless the Leap Year doth combine
And give to February 29

Fourth, eleventh, ninth, and sixth,
 Thirty days to each affix,
 Every other thirty-one
 Except the second month alone.

30 days hath September,
April, June, and November,
All the rest have 31,
Excepting February which alone,
has 28, and 1 day more,
in which we add in "the year of four"...

Version 46

Thirty days hath September,
April, June, and November,
All the rest I don't remember.

Thirty days hath September
April, June, and November
The 2nd month has 28 days of rhyme
'til Leap Year gives her 29.
All the rest get thirty-one
Repeat the mnemonic, as it is done.
 

30 days has September,
April, June and November.
All the rest have 31
except the second month alone,
To which we 28 assign,
'til Leap Year gives it 29.

Version 43

30 days hath September,
April, June, and November;
All the rest have thirty-one
Except February -
That's the weird one.

Thirty days hath September,
All the rest I can't remember.
The calendar hangs on the wall;
Why bother me with this at all?

Thirty days hath September,
April June and November.
All the rest have thirty-one
Excepting February alone,
Which has twenty-eight days clear,
But twenty-nine each Leap Year.
 

 
Version 40

Thirty days has September,
April, June and November,
All the rest have thirty one,
Excepting February, fun!
And that has twenty eight days clear,
And twenty nine in a Leap Year!
 

Version 41

Thirty days hath September,
April, June, and November.
All the rest have 31,
Though February's underdone
With 28--hold the line!--
Leap Day makes it 29.

Version 42

Thirty days has September,
April, June and November.
All the rest have 31
except February which has 4 and 24,
'til Leap Year gives it one day more.

Version 37

Thirty days hath September,
April, June, and November;
All the rest have thirty-one
Excepting February alone:
Which hath but twenty-eight, in fine,
Till Leap Year gives it twenty-nine.

 
Version 38

Thirty days hath September,
April, June, and November;
all the rest have thirty-one,
except for February alone.
February has twenty-eight days clear,
and twenty-nine in each Leap Year.
 

Version 39

Thirty days hath September,
April, June and November;
All the rest of thirty-one,
Excepting February alone,
Which has but twenty-eight days clear
And twenty-nine in each Leap Year.

 
Version 34

Thirty days have September,
April, June, and November,
All the rest have thirty-one
Except short February
Which in line
Has twenty-eight,
Leap Year makes it twenty-nine.
 

Version 35

30 days hath September,
April, June and November
(all the rest have 31 except February
which has 28 and 29 in a Leap Year).

Version 36

Thirty days hath September,
April, June, and November;
All the rest have thirty-one,
Excepting February alone,
And it has twenty-eight days time,
But in Leap Years,
February has twenty-nine.

 
Version 31

Thirty days hath September
April, June, and November
Except the second month alone
Which has but twenty-eight, 'tis fine
'Til Leap Year makes it twenty-nine 
All the rest have thirty-one
 

Version 32

Thirty days hath September,
April, June and November;
all the rest have thirty one
except for February alone,
which has twenty eight each year,
twenty nine each Leap Year.

Version 33

Thirty days hath September,
April, June, and November;
February has twenty-eight alone,
All the rest have thirty-one,
Excepting Leap-Year, that's the time
When February's days are twenty-nine.  

 
Version 28

Thirty days hath September,
April, June, and November;
All the rest have thirty-one,
Excepting February alone,
Which hath but twenty-eight, in fine,
Till Leap Year gives it twenty-nine.
 

Version 29

Thirty days hath November,
April, June, and September,
February hath xxviii alone,
And all the rest have xxxi. 
Richard Grafton:
Chronicles of England. (1590.)

Version 30

Thirty days hath September,
April, June and November;
All the rest have thirty-one
Save February, she alone
Hath eight days and a score
'Til Leap Year gives her one day more.

Version 25

30 days hath September
April, June, and November
All the rest have thirty-one
Save February
Which has 28 in fine
Till Leap Year gives it 29

Thirty days hath September,
April, June and November.
All the rest have thirty-one,
with February's 28 to make it fun.
Leap Year happening once in four,
Gives February one day more.
 

Thirty days has September
April, June, and November.
All the rest have thirty-one,
Except February, which has
twenty-eight,
In a Leap Year, twenty-nine.

Version 22

Thirty days hath September,
April, June, and November;
All the rest have thirty-one
Except February alone:
Which has twenty-eight 3 years in four,
Till Leap Year gives it just one more.

Thirty days has September,
April, June and November.
All the rest have thirty-one,
except that one contrary, February,
which has twenty-eight,
most of the time,
but in Leap Year twenty-nine.
 

Thirty days hath September,
April June and November.
When short February's done,
All the rest have thirty-one

 
Version 19

Thirty days has September,
April, June and November.
All the rest have 31
excepting February which alone has 28,
and one day more
we add to it each year in four.
 

Thirty Days hath September,
April, June and November
To all the rest we add 31,
Except the shortest month alone,
February, which has twenty-eight,
And twenty-nine in Leap Year

Thirty Days are in September,
April, June and also November
All the rest have thirty-one,
Except for February, which, when done,
Has twenty-eight that we assign
But Leap Year gives it twenty-nine

30 days hath September
April, June & November
All the rest hath 31
Except February
Which alone has 28
And 1 day more
When Leap Year comes
One year in four.

 
Version 17
 

Thirty days have September,
April, June and November.
All the rest have thirty-one,
Except February the only one
Which Leap Years change
each fourth time
From twenty-eight to twenty-nine.
Century 100s don’t always leap,
each 400 years that leap we keep.
 

Thirty days hath September
April, June and November
All the rest have thirty-one
Save February, and it alone,
Has twenty-eight we do confine
Till Leap year gives it twenty nine.

Thirty days hath September
April June and November
All the rest have thirty-one
But Leap Year coming once in four
February then has one day more
 

30 days in November
with April, June and September
of twenty-eight there is one
all the rest have thirty-one

Fourth, eleventh, ninth, and sixth,
Thirty days to each affix,
Every other thirty-one
Except the second month alone.

30 days hath September,
April, June, and November.
The rest have 31... no, wait!
February has only 28!
Except in Leap Year, that's the time,
When February's days are 29!
 

30 days (or not)
 
Thirty days has September
April June and November
All the rest have 31 save February
That's the real odd one

30 days hath September
April June and November
all the rest have 31
except for February which alone
has 28 and 1 day more, 1 year in 4

30 days hath September,
April, June and November;
all the rest have 31
excepting February alone,
which has 28 days clear
and 29 in each Leap Year.

Thirty days has September,
April, June, and November.
Thirty-one days for all the rest,
except February has 28, which is less.
This happens three years in four
until a leap year gives it one day more.
 

30 days hath September,
April, June, and November.
All the rest have 31,
excepting February,
that contrary son of a gun.

Version 4

Thirty days hath Septober,
April, June, and no wonder
All the rest have thirty one
Except Gramma
And she has a little red wagon
 

Thirty day hath Septober
April, June, and Montana
All the rest have cold weather
Except in the summer
which ain't very often

Thirty days hath Juvember,
Apples, Noon and No Wonder,
All the rest have Peanut Butter,
Except my Grandma
And she has a little red tricycle.

 
Version 1

30 days hath Septober
April June and no wonder
All the rest eat peanut butter
Except Grandma and
she rides a tricycle
 

Thirty days hath Septober
April, June and Novober
All the rest have peanut butter
Except Grandma
and she rides a Harley Sportster

Thirty days hath September,
April, June, and no wonder,
all the rest eat peanut butter
except for my Grandma...
she drives a Ford.