I couldn’t think of a single bad episode, so I was curious what other people thought was the worst. Both the pilot and the second Queen of Jordan were rated the worst, at 7.2. Still a pretty good rating!

• Note that the Y axis on each chart does not go from 0-10. They are all 7-9.5.
• Data source: IMDb
• Tools used: LibreOffice Calc, GIMP

Season 1 chart

Season 2 chart

Season 3 chart

Season 4 chart

Season 5 chart

Season 6 chart

Season 7 chart

Raw data

Season	Episode	Chronological	Name	Rating
1	1	1	Pilot	7.2
1	2	2	The Aftermath	7.5
1	3	3	Blind Date	7.8
1	4	4	Jack the Writer	7.4
1	5	5	Jack-Tor	8.0
1	6	6	Jack Meets Dennis	7.6
1	7	7	Tracy Does Conan	8.2
1	8	8	The Break-Up	7.7
1	9	9	The Baby Show	7.9
1	10	10	The Rural Juror	7.9
1	11	11	The Head and the Hair	8.1
1	12	12	Black Tie	8.4
1	13	13	Up All Night	7.9
1	14	14	The C Word	7.8
1	15	15	Hard Ball	8.3
1	16	16	The Source Awards	7.7
1	17	17	The Fighting Irish	7.8
1	18	18	Fireworks	8.1
1	19	19	Corporate Crush	7.7
1	20	20	Cleveland	8.0
1	21	21	Hiatus	8.1
2	1	22	Seinfeldvision	8.2
2	2	23	Jack Gets in the Game	7.9
2	3	24	The Collection	7.7
2	4	25	Rosemary’s Baby	8.1
2	5	26	Greenzo	8.2
2	6	27	Somebody to Love	8.1
2	7	28	Cougars	8.0
2	8	29	Secrets and Lies	7.7
2	9	30	Ludachristmas	8.1
2	10	31	Episode 210	7.9
2	11	32	MILF Island	8.3
2	12	33	Subway Hero	7.6
2	13	34	Succession	8.3
2	14	35	Sandwich Day	8.0
2	15	36	Cooter	8.3
3	1	37	Do-Over	8.1
3	2	38	Believe in the Stars	8.4
3	3	39	The One with the Cast of ‘Night Court’	7.9
3	4	40	Gavin Volure	8.1
3	5	41	Reunion	8.5
3	6	42	Christmas Special	7.7
3	7	43	Señor Macho Solo	8.0
3	8	44	Flu Shot	7.7
3	9	45	Retreat to Move Forward	7.9
3	10	46	Generalissimo	8.5
3	11	47	St. Valentine’s Day	8.2
3	12	48	Larry King	8.0
3	13	49	Goodbye, My Friend	8.0
3	14	50	The Funcooker	8.2
3	15	51	The Bubble	8.1
3	16	52	Apollo, Apollo	8.4
3	17	53	Cutbacks	7.6
3	18	54	Jackie Jormp-Jomp	7.9
3	19	55	The Ones	7.9
3	20	56	The Natural Order	7.8
3	21	57	Mamma Mia	8.0
3	22	58	Kidney Now!	8.6
4	1	59	Season 4	7.7
4	2	60	Into the Crevasse	7.7
4	3	61	Stone Mountain	7.7
4	4	62	Audition Day	7.9
4	5	63	The Problem Solvers	7.9
4	6	64	Sun Tea	7.7
4	7	65	Dealbreakers Talk Show #0001	8.1
4	8	66	Secret Santa	8.0
4	9	67	Klaus and Greta	8.3
4	10	68	Black Light Attack!	7.9
4	11	69	Winter Madness	7.4
4	12	70	Verna	7.6
4	13	71	Anna Howard Shaw Day	8.5
4	14	72	Future Husband	7.7
4	15	73	Don Geiss, America, and Hope	7.9
4	16	74	Floyd	7.8
4	17	75	Lee Marvin vs. Derek Jeter	7.8
4	18	76	Khonani	7.4
4	19	77	Argus	7.6
4	20	78	The Moms	7.7
4	21	79	Emmanuelle Goes to Dinosaur Land	8.1
4	22	80	I Do Do	8.5
5	1	81	The Fabian Strategy	7.9
5	2	82	When It Rains, It Pours	8.2
5	3	83	Let’s Stay Together	7.7
5	4	84	Live Show	8.5
5	5	85	Reaganing	8.0
5	6	86	Gentleman’s Intermission	7.8
5	7	87	Brooklyn Without Limits	7.9
5	8	88	College	7.8
5	9	89	Chain Reaction of Mental Anguish	7.6
5	10	90	Christmas Attack Zone	7.9
5	11	91	Mrs. Donaghy	8.2
5	12	92	Operation Righteous Cowboy Lightning	8.3
5	13	93	¡Qué Sorpresa!	7.9
5	14	94	Double-Edged Sword	8.3
5	15	95	It’s Never Too Late for Now	8.2
5	16	96	TGS Hates Women	8.2
5	17	97	Queen of Jordan	7.5
5	18	98	Plan B	7.8
5	19	99	I Heart Connecticut	7.6
5	20	100	100: Part 1	8.0
5	21	101	100: Part 2	8.4
5	22	102	Everything Sunny All the Time Always	7.9
5	23	103	Respawn	7.6
6	1	104	Dance Like Nobody’s Watching	7.9
6	2	105	Idiots Are People Two!	7.8
6	3	106	Idiots Are People Three!	7.9
6	4	107	The Ballad of Kenneth Parcell	7.7
6	5	108	Today You Are a Man	7.8
6	6	109	Hey, Baby, What’s Wrong?: Part 1	7.7
6	7	110	Hey, Baby, What’s Wrong?: Part 2	7.9
6	8	111	The Tuxedo Begins	8.4
6	9	112	Leap Day	8.1
6	10	113	Alexis Goodlooking and the Case of the Missing Whisky	7.6
6	11	114	Standards and Practices	7.9
6	12	115	St. Patrick’s Day	7.6
6	13	116	Grandmentor	7.4
6	14	117	Kidnapped by Danger	8.2
6	15	118	The Shower Principle	7.4
6	16	119	Nothing Left to Lose	7.5
6	17	120	Meet the Woggels!	7.5
6	18	121	Murphy Brown Lied to Us	7.7
6	19	122	Live from Studio 6H	8.5
6	20	123	Queen of Jordan 2: The Mystery of the Phantom Pooper	7.2
6	21	124	The Return of Avery Jessup	7.6
6	22	125	What Will Happen to the Gang Next Year?	7.8
7	1	126	The Beginning of the End	7.6
7	2	127	Governor Dunston	7.6
7	3	128	Stride of Pride	7.7
7	4	129	Unwindulax	7.8
7	5	130	There’s No I in America	7.5
7	6	131	Aunt Phatso vs. Jack Donaghy	7.5
7	7	132	Mazel Tov, Dummies!	8.2
7	8	133	My Whole Life is Thunder	7.9
7	9	134	Game Over	8.3
7	10	135	Florida	7.9
7	11	136	A Goon’s Deed in a Weary World	8.3
7	12	137	Hogcock!	8.9
7	13	138	Last Lunch	9.2

Separated by season, with seasonal averages

Ep. #	Season 1	Season 2	Season 3	Season 4	Season 5	Season 6	Season 7
1	7.2	8.2	8.1	7.7	7.9	7.9	7.6
2	7.5	7.9	8.4	7.7	8.2	7.8	7.6
3	7.8	7.7	7.9	7.7	7.7	7.9	7.7
4	7.4	8.1	8.1	7.9	8.5	7.7	7.8
5	8.0	8.2	8.5	7.9	8.0	7.8	7.5
6	7.6	8.1	7.7	7.7	7.8	7.7	7.5
7	8.2	8.0	8.0	8.1	7.9	7.9	8.2
8	7.7	7.7	7.7	8.0	7.8	8.4	7.9
9	7.9	8.1	7.9	8.3	7.6	8.1	8.3
10	7.9	7.9	8.5	7.9	7.9	7.6	7.9
11	8.1	8.3	8.2	7.4	8.2	7.9	8.3
12	8.4	7.6	8.0	7.6	8.3	7.6	8.9
13	7.9	8.3	8.0	8.5	7.9	7.4	9.2
14	7.8	8.0	8.2	7.7	8.3	8.2
15	8.3	8.3	8.1	7.9	8.2	7.4
16	7.7		8.4	7.8	8.2	7.5
17	7.8		7.6	7.8	7.5	7.5
18	8.1		7.9	7.4	7.8	7.7
19	7.7		7.9	7.6	7.6	8.5
20	8.0		7.8	7.7	8.0	7.2
21	8.1		8.0	8.1	8.4	7.6
22			8.6	8.5	7.9	7.8
23					7.6
Avg.	7.9	8.0	8.1	7.9	8.0	7.8	8.0

How many episodes are rated the same?

Rating	Frequency
7.2	2
7.4	5
7.5	6
7.6	13
7.7	18
7.8	13
7.9	24
8.0	11
8.1	12
8.2	11
8.3	9
8.4	5
8.5	6
8.6	1
8.9	1
9.2	1