The Boston Celtics had their highest three-point percentage in a season in 2008-09, at 39.7 percent.

Interpreted as:

celtics highest three point percentage in a regular season

	TEAM	3P%	SEASON	GP	MPG	PPG	RPG	APG	SPG	BPG	FGM	FGA	FG%	3PM	3PA	FTM	FTA	FT%	TS%	OREB	DREB	TPG	MIN	PTS	REB	AST	STL	BLK	TOV	PF
1	Celtics	39.7	2008-09	82	242.4	100.9	42.1	22.7	7.6	4.7	37.5	77.2	48.6	6.6	16.5	19.4	25.3	76.5	57.1	10.6	31.5	15.6	19,880	8,275	3,455	1,862	621	387	1,280	1,897
2	Celtics	38.8	2023-24	82	241.8	120.6	46.3	26.9	6.8	6.6	43.9	90.2	48.7	16.5	42.5	16.3	20.2	80.7	60.9	10.7	35.6	11.9	19,830	9,887	3,799	2,207	557	538	979	1,326
3	Celtics	38.4	1987-88	82	241.2	113.6	41.1	29.9	7.6	5.1	43.9	84.2	52.1	3.3	8.6	22.5	28.0	80.3	58.8	11.3	29.8	15.9	19,780	9,315	3,370	2,448	620	415	1,304	1,804
4	Celtics	38.4	1979-80	82	242.4	113.5	44.9	26.8	9.9	3.8	44.1	90.1	49.0	2.0	5.1	23.3	29.9	77.9	55.0	15.0	30.0	18.8	19,880	9,303	3,684	2,198	809	308	1,539	1,974
5	Celtics	38.1	2007-08	82	240.9	100.5	42.0	22.4	8.5	4.6	36.4	76.7	47.5	7.3	19.1	20.5	26.5	77.1	56.9	10.1	31.9	15.2	19,755	8,245	3,445	1,833	696	379	1,246	1,864
6	Celtics	37.7	2017-18	82	241.5	104.0	44.5	22.5	7.4	4.5	38.3	85.1	45.0	11.5	30.4	16.0	20.7	77.1	55.2	9.4	35.1	14.0	19,805	8,529	3,645	1,842	604	373	1,148	1,618
7	Celtics	37.7	2022-23	82	243.7	117.9	45.3	26.7	6.4	5.2	42.2	88.8	47.5	16.0	42.6	17.5	21.6	81.2	60.0	9.7	35.6	13.4	19,980	9,671	3,717	2,186	521	430	1,095	1,542
8	Celtics	37.4	2020-21	72	241.4	112.6	44.3	23.5	7.7	5.3	41.5	88.9	46.6	13.6	36.4	16.1	20.8	77.5	57.4	10.6	33.6	14.1	17,380	8,109	3,186	1,689	556	383	1,012	1,471
9	Celtics	37.1	1995-96	82	242.7	103.6	42.4	21.9	8.0	5.0	38.6	84.7	45.6	6.6	17.7	19.9	27.9	71.4	53.4	12.8	29.6	15.9	19,905	8,495	3,477	1,792	653	406	1,302	2,041
10	Celtics	36.8	2024-25	82	241.8	116.3	45.3	26.1	7.2	5.5	41.6	90.0	46.2	17.8	48.2	15.3	19.1	79.9	59.1	11.4	33.9	11.9	19,830	9,534	3,716	2,144	589	452	973	1,303
11	Celtics	36.8	1994-95	82	241.5	102.8	42.4	21.7	7.5	4.4	38.8	83.5	46.4	4.4	12.0	20.8	27.7	75.3	53.7	14.1	28.3	15.9	19,805	8,428	3,476	1,783	612	361	1,305	1,975
12	Celtics	36.7	2011-12	66	241.5	91.8	38.8	23.6	7.5	5.5	35.5	77.1	46.0	5.5	15.0	15.4	19.8	77.8	53.5	7.7	31.1	14.8	15,940	6,062	2,560	1,557	498	362	979	1,315
13	Celtics	36.7	2006-07	82	242.1	95.8	40.4	19.9	7.2	4.7	34.9	78.7	44.3	5.7	15.6	20.4	26.6	76.7	53.0	11.2	29.2	16.5	19,855	7,857	3,309	1,630	589	382	1,350	1,971
14	Celtics	36.6	1986-87	82	241.5	112.6	42.9	29.5	6.8	6.4	44.5	86.0	51.7	2.5	6.9	21.2	26.3	80.8	57.7	11.4	31.5	15.9	19,805	9,237	3,518	2,421	561	526	1,300	1,710
15	Celtics	36.5	2018-19	82	241.2	112.4	44.5	26.3	8.6	5.3	42.1	90.5	46.5	12.6	34.5	15.6	19.5	80.2	56.7	9.8	34.7	12.8	19,780	9,216	3,653	2,155	706	435	1,052	1,670
16	Celtics	36.5	2010-11	82	241.2	96.5	38.8	23.4	8.2	4.2	36.9	75.8	48.6	5.0	13.6	17.8	23.1	77.0	56.1	7.8	31.0	14.6	19,780	7,913	3,181	1,921	676	344	1,195	1,678
17	Celtics	36.4	2019-20	72	242.1	113.7	46.1	23.0	8.3	5.6	41.3	89.6	46.1	12.6	34.5	18.6	23.2	80.1	57.0	10.7	35.4	13.8	17,430	8,183	3,317	1,655	595	406	995	1,553
18	Celtics	36.3	2000-01	82	241.8	94.6	39.8	20.8	9.4	4.1	33.8	79.1	42.8	7.2	19.9	19.8	26.7	74.0	52.1	10.9	28.9	15.7	19,830	7,759	3,264	1,708	769	336	1,285	1,952
19	Celtics	36.2	2005-06	82	242.4	98.0	39.6	20.9	7.0	5.1	36.0	77.1	46.7	5.7	15.7	20.3	26.9	75.5	55.1	9.9	29.7	16.6	19,880	8,033	3,245	1,716	578	422	1,359	2,033
20	Celtics	36.0	1998-99	50	243.0	93.0	42.8	21.5	9.1	5.1	36.3	83.3	43.6	5.5	15.2	14.9	21.5	69.2	50.1	13.6	29.2	16.1	12,150	4,650	2,138	1,073	453	255	807	1,193
21	Celtics	35.9	2016-17	82	240.9	108.0	42.0	25.2	7.5	4.1	38.6	85.1	45.4	12.0	33.4	18.7	23.2	80.7	56.7	9.1	32.9	13.3	19,755	8,857	3,442	2,069	617	340	1,088	1,686
22	Celtics	35.9	2001-02	82	241.8	96.4	42.2	21.0	9.7	3.6	34.8	82.1	42.4	8.5	23.7	18.3	23.9	76.4	52.0	10.9	31.3	13.6	19,830	7,901	3,461	1,722	793	292	1,114	1,776
23	Celtics	35.8	2012-13	81	244.9	96.5	39.3	22.8	8.2	4.5	37.0	79.7	46.5	6.1	17.2	16.3	21.0	77.6	54.2	8.1	31.3	14.6	19,840	7,818	3,187	1,843	667	365	1,181	1,717
24	Celtics	35.6	2021-22	82	242.7	111.8	46.1	24.8	7.2	5.8	40.7	87.4	46.6	13.2	37.1	17.0	20.9	81.6	57.8	10.5	35.5	13.6	19,905	9,164	3,778	2,036	591	478	1,118	1,521
25	Celtics	35.6	1984-85	82	240.3	114.8	45.7	27.9	7.9	5.0	45.4	89.3	50.8	1.3	3.8	22.7	28.1	80.6	56.4	13.6	32.1	16.2	19,705	9,412	3,746	2,287	645	414	1,332	1,781