Observation log for Wolf Sunspot Number - 2025

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January 2025
Date	Time (JST)	P	B0	L0	North.		South.		Revised Wolf number
					g'	f	g'	f	North.	South.	Total
01	11:45	1.8	-3.1	73.5	2	30	9	76	50	166	216
02	10:26	1.4	-3.2	62.8	2	20	8	97	40	177	217
03
04	10:29	0.5	-3.4	36.4	3	15	8	75	45	155	200
05	9:38	0.0	-3.5	23.7	4	39	9	80	79	170	249
06
07
08	7:51	-1.4	-3.8	345.2	3	14	6	12	44	72	116
09	10:24	-2.0	-3.9	330.6	5	38	5	24	88	74	162
10
11	10:26	-2.9	-4.2	304.2	5	49	5	11	99	61	160
12
13	9:46	-3.8	-4.4	278.2	5	41	6	5	91	65	156
14	7:53	-4.3	-4.5	266.1	4	28	3	4	68	34	102
15	8:00	-4.7	-4.6	252.9	4	11	3	8	51	38	89
16	10:14	-5.3	-4.7	238.5	6	37	3	23	97	53	150
17	7:55	-5.7	-4.8	226.6	6	20	2	14	80	34	114
18	10:35	-6.2	-4.9	212.0	7	55	3	39	125	69	194
19	14:37	-6.7	-5.0	196.6	5	47	4	37	97	77	174
20	11:49	-7.1	-5.1	185.0	5	50	4	52	100	92	192
21
22
23	7:58	-8.4	-5.3	147.6	5	30	4	68	80	108	188
24	8:50	-8.9	-5.4	133.9	5	30	4	88	80	128	208
25	10:28	-9.3	-5.5	119.9	6	32	4	54	92	94	186
26	10:04	-9.7	-5.6	106.9	5	19	4	31	69	71	140
27
28
29	7:53	-11.0	-5.8	68.6	5	12	4	12	62	52	114
30	7:53	-11.4	-5.9	55.5	4	18	4	12	58	52	110
31	7:54	-11.8	-6.0	42.3	5	64	3	20	114	50	164
Monthly mean					4.6	31.8	4.8	38.3	77.7	86.0	163.7
February 2025
Date	Time (JST)	P	B0	L0	North.		South.		Revised Wolf number
					g'	f	g'	f	North.	South.	Total
01	10:54	-12.3	-6.0	27.5	5	80	3	33	130	63	193
02
03
04	7:55	-13.4	-6.2	349.6	5	76	3	6	126	36	162
05	7:56	-13.8	-6.3	336.4	8	105	2	4	185	24	209
06	7:56	-14.2	-6.4	323.3	9	95	2	5	185	25	210
07	9:45	-14.6	-6.4	309.1	9	80	3	2	170	32	202
08	9:56	-15.0	-6.5	295.8	9	48	3	9	138	39	177
09	9:39	-15.4	-6.5	282.8	7	37	4	9	107	49	156
10	9:15	-15.7	-6.6	269.9	6	22	3	6	82	36	118
11	9:01	-16.1	-6.6	256.8	5	11	3	15	61	45	106
12
13	7:53	-16.8	-6.7	231.1	3	5	5	15	35	65	100
14	10:33	-17.1	-6.8	216.5	4	8	6	59	48	119	167
15	10:14	-17.5	-6.8	203.5	5	12	7	64	62	134	196
16	9:25	-17.8	-6.9	190.8	4	26	7	93	66	163	229
17
18	7:56	-18.4	-7.0	165.3	4	31	7	67	71	137	208
19	7:55	-18.7	-7.0	152.1	4	33	6	41	73	101	174
20	7:54	-19.0	-7.0	138.9	4	7	5	53	47	103	150
21	10:00	-19.4	-7.1	124.6	5	33	4	80	83	120	203
22	10:04	-19.7	-7.1	111.4	7	43	4	66	113	106	219
23	8:54	-19.9	-7.1	98.9	8	39	6	52	119	112	231
24	9:53	-20.2	-7.1	85.2	7	46	5	65	116	115	231
25	10:12	-20.5	-7.2	71.8	7	38	5	50	108	100	208
26	7:57	-20.8	-7.2	59.9	7	23	5	35	93	85	178
27	7:54	-21.0	-7.2	46.7	5	12	4	10	62	50	112
28
Monthly mean					6.0	39.6	4.4	36.5	99.1	80.8	180.0
March 2025
Date	Time (JST)	P	B0	L0	North.		South.		Revised Wolf number
					g'	f	g'	f	North.	South.	Total
01	9:25	-21.6	-7.2	19.6	6	56	2	21	116	41	157
02
03
04
05
06
07	7:58	-22.9	-7.3	301.3	4	4	8	56	44	136	180
08
09	10:01	-23.4	-7.2	273.9	3	3	6	40	33	100	133
10	7:56	-23.5	-7.2	261.8	2	7	6	28	27	88	115
11
12
13	8:17	-24.1	-7.2	222.1	7	52	7	27	122	97	219
14	10:58	-24.3	-7.2	207.4	7	49	6	29	119	89	208
15
16
17
18
19
20	9:21	-25.1	-7.1	129.2	10	46	6	64	146	124	270
21	9:20	-25.3	-7.0	116.1	10	29	6	44	129	104	233
22	8:53	-25.4	-7.0	103.1	10	45	8	28	145	108	253
23	10:42	-25.5	-7.0	88.9	9	64	8	27	154	107	261
24	8:32	-25.6	-6.9	76.9	7	61	7	14	131	84	215
25
26
27
28
29
30	10:39	-26.1	-6.7	356.7	5	82	5	36	132	86	218
31
Monthly mean					6.7	41.5	6.3	34.5	108.2	97.0	205.2
April 2025
Date	Time (JST)	P	B0	L0	North.		South.		Revised Wolf number
					g'	f	g'	f	North.	South.	Total
01
02
03
04	8:32	-26.2	-6.4	291.8	4	30	3	67	70	97	167
05	9:42	-26.3	-6.3	278.0	5	33	7	118	83	188	271
06
07
08
09	7:15	-26.2	-6.1	226.6	5	17	5	36	67	86	153
10
11
12	8:46	-26.2	-5.8	186.1	6	83	2	8	143	28	171
13
14
15
16	7:16	-25.9	-5.5	134.1	5	21	2	9	71	29	100
17	7:06	-25.9	-5.5	121.0	6	33	4	26	93	66	159
18
19	11:04	-25.7	-5.3	92.4	4	24	4	54	64	94	158
20
21	7:15	-25.5	-5.1	68.1	3	28	5	32	58	82	140
22
23
24
25
26	9:13	-24.9	-4.7	0.9	3	33	11	52	63	162	225
27	9:08	-24.7	-4.6	347.8	3	11	11	28	41	138	179
28
29	9:16	-24.4	-4.4	321.3	5	22	7	39	72	109	181
30	9:31	-24.3	-4.3	308.0	4	33	5	24	73	74	147
Monthly mean					4.4	30.7	5.5	41.1	74.8	96.1	170.9
May 2025
Date	Time (JST)	P	B0	L0	North.		South.		Revised Wolf number
					g'	f	g'	f	North.	South.	Total
01	12:46	-24.1	-4.2	293.0	4	31	5	19	71	69	140
02
03	9:26	-23.7	-4.0	268.4	3	32	4	3	62	43	105
04	12:11	-23.5	-3.9	253.7	3	65	5	7	95	57	152
05
06
07	7:21	-22.9	-3.6	216.6	3	67	1	11	97	21	118
08
09
10
11	10:12	-21.9	-3.1	162.2	3	26	2	7	56	27	83
12
13	7:27	-21.5	-2.9	137.2	4	18	2	8	58	28	86
14
15	7:16	-20.9	-2.7	110.9	3	21	2	1	51	21	72
16
17
18
19
20	7:15	-19.5	-2.1	44.8	2	15	4	11	35	51	86
21
22
23
24
25
26
27
28	7:19	-16.8	-1.2	298.9	4	21	6	25	61	85	146
29
30
31	14:20	-15.7	-0.8	255.3	5	95	6	28	145	88	233
Monthly mean					3.4	39.1	3.7	12.0	73.1	49.0	122.1
June 2025
Date	Time (JST)	P	B0	L0	North.		South.		Revised Wolf number
					g'	f	g'	f	North.	South.	Total
01
02
03
04
05	7:54	-13.8	-0.2	192.7	4	34	2	22	74	42	116
06
07	9:52	-13.0	0.1	165.2	3	6	3	53	36	83	119
08
09	10:03	-12.2	0.3	138.6	2	8	4	69	28	109	137
10
11
12
13
14
15	15:56	-9.6	1.1	55.9	5	56	4	16	106	56	162
16
17	7:17	-8.9	1.2	34.2	6	85	2	4	145	24	169
18
19
20	10:03	-7.5	1.6	353.0	5	57	3	26	107	56	163
21	10:00	-7.1	1.7	339.8	5	34	3	21	84	51	135
22	10:03	-6.6	1.9	326.5	4	13	3	38	53	68	121
23
24
25
26
27	11:56	-4.4	2.4	259.3	2	26	5	26	46	76	122
28	11:34	-3.9	2.5	246.2	5	34	6	22	84	82	166
29	10:21	-3.5	2.7	233.7	5	32	7	24	82	94	176
30
Monthly mean					4.2	35.0	3.8	29.2	76.8	67.4	144.2
July 2025
Date	Time (JST)	P	B0	L0	North.		South.		Revised Wolf number
					g'	f	g'	f	North.	South.	Total
01
02
03
04	12:02	-1.2	3.2	166.6	4	24	6	35	64	95	159
05	13:21	-0.7	3.3	152.6	4	16	6	19	56	79	135
06
07
08
09
10
11
12
13	14:37	2.9	4.2	46.0	4	58	3	15	98	45	143
14
15
16
17
18	7:24	5.0	4.6	343.9	6	92	5	38	152	88	240
19	13:41	5.5	4.7	327.1	7	63	6	20	133	80	213
20	9:21	5.9	4.8	316.3	7	70	5	23	140	73	213
21	7:13	6.3	4.9	304.3	8	56	5	20	136	70	206
22
23	7:09	7.2	5.1	277.8	6	21	6	17	81	77	158
24	10:10	7.6	5.2	262.9	6	31	6	36	91	96	187
25	9:47	8.0	5.2	249.9	5	24	6	41	74	101	175
26	11:21	8.5	5.3	235.8	4	20	8	64	60	144	204
27	11:03	8.9	5.4	222.8	4	18	8	56	58	136	194
28
29	7:16	9.6	5.6	198.4	5	8	8	53	58	133	191
30
31	9:45	10.5	5.7	170.6	8	22	8	52	102	132	234
Monthly mean					5.6	37.4	6.1	34.9	93.1	96.4	189.4
August 2025
Date	Time (JST)	P	B0	L0	North.		South.		Revised Wolf number
					g'	f	g'	f	North.	South.	Total
01	11:27	10.9	5.8	156.4	7	36	7	39	106	109	215
02	10:12	11.3	5.9	143.9	6	53	7	22	113	92	205
03	10:56	11.7	5.9	130.3	5	65	6	18	115	78	193
04
05	7:15	12.4	6.1	105.8	4	75	3	6	115	36	151
06
07
08	9:29	13.6	6.3	64.9	7	59	4	12	129	52	181
09	9:30	13.9	6.3	51.7	9	67	4	10	157	50	207
10
11
12
13	9:46	15.4	6.5	358.7	7	78	4	18	148	58	206
14	9:17	15.7	6.6	345.7	8	53	4	21	133	61	194
15	9:14	16.1	6.6	332.5	10	38	5	27	138	77	215
16	10:00	16.4	6.7	318.9	9	29	5	36	119	86	205
17	13:00	16.8	6.7	304.0	9	24	4	21	114	61	175
18	9:02	17.0	6.8	293.0	7	11	3	16	81	46	127
19	8:23	17.4	6.8	280.1	5	5	4	15	55	55	110
20
21
22	11:50	18.3	6.9	238.6	5	18	4	6	68	46	114
23	9:26	18.6	7.0	226.7	5	17	3	2	67	32	99
24	9:39	18.9	7.0	213.4	5	32	4	4	82	44	126
25
26
27	7:15	19.7	7.1	175.0	7	68	8	61	138	141	279
28
29	8:48	20.3	7.1	147.7	6	35	8	90	95	170	265
30	9:18	20.6	7.2	134.3	9	30	8	111	120	191	311
31	9:47	20.8	7.2	120.8	9	43	6	101	133	161	294
Monthly mean					7.0	41.8	5.1	31.8	111.3	82.3	193.6
September 2025
Date	Time (JST)	P	B0	L0	North.		South.		Revised Wolf number
					g'	f	g'	f	North.	South.	Total
01
02	7:12	21.3	7.2	95.8	9	30	6	57	120	117	237
03	7:16	21.6	7.2	82.6	9	45	6	35	135	95	230
04
05
06	8:50	22.3	7.3	42.1	7	52	3	3	122	33	155
07	11:05	22.5	7.3	27.6	6	36	3	15	96	45	141
08
09
10
11
12	8:37	23.5	7.2	323.0	5	15	2	13	65	33	98
13
14	10:29	23.9	7.2	295.5	3	16	2	7	46	27	73
15	9:17	24.1	7.2	283.0	4	36	3	16	76	46	122
16
17
18
19
20
21	8:21	25.0	7.1	204.3	5	25	6	68	75	128	203
22	11:19	25.1	7.1	189.5	5	10	6	82	60	142	202
23	8:19	25.2	7.0	177.9	6	16	8	78	76	158	234
24	7:55	25.3	7.0	164.9	6	14	8	79	74	159	233
25	8:02	25.4	7.0	151.7	4	9	8	75	49	155	204
26	8:04	25.5	6.9	138.5	4	9	8	80	49	160	209
27	11:58	25.7	6.9	123.1	3	6	7	62	36	132	168
28	8:53	25.7	6.9	111.6	5	28	6	68	78	128	206
29
30	7:56	25.9	6.8	85.8	6	84	6	47	144	107	251
Monthly mean					5.4	26.9	5.5	49.1	81.3	104.1	185.4
October 2025
Date	Time (JST)	P	B0	L0	North.		South.		Revised Wolf number
					g'	f	g'	f	North.	South.	Total
01
02	7:52	26.0	6.7	59.4	8	61	6	20	141	80	221
03	8:06	26.1	6.6	46.1	8	92	6	14	172	74	246
04	8:28	26.1	6.6	32.7	8	92	4	19	172	59	231
05	14:10	26.2	6.5	16.3	8	88	2	24	168	44	212
06
07
08	7:51	26.2	6.4	340.2	8	18	4	27	98	67	165
09
10	8:17	26.3	6.2	313.6	5	9	5	20	59	70	129
11
12	9:21	26.2	6.1	286.6	5	67	6	18	117	78	195
13
14
15
16
17	7:57	26.1	5.7	221.4	5	56	5	14	106	64	170
18	11:09	26.0	5.6	206.5	5	28	7	31	78	101	179
19
20
21
22
23
24	7:20	25.5	5.2	129.5	6	5	8	9	65	89	154
25
26
27
28	7:52	25.1	4.8	76.4	4	9	9	14	49	104	153
29	7:55	24.9	4.7	63.2	3	18	8	13	48	93	141
30	7:54	24.8	4.6	50.0	3	17	7	4	47	74	121
31	8:08	24.6	4.5	36.7	3	9	4	4	39	44	83
Monthly mean					5.6	40.6	5.8	16.5	97.1	74.4	171.4
November 2025
Date	Time (JST)	P	B0	L0	North.		South.		Revised Wolf number
					g'	f	g'	f	North.	South.	Total
01	12:59	24.4	4.4	20.9	2	1	4	7	21	47	68
02	10:11	24.3	4.3	9.2	3	2	3	0	32	30	62
03	13:45	24.1	4.2	354.1	2	3	3	13	23	43	66
04	7:54	23.9	4.1	344.1	4	34	3	24	74	54	128
05
06
07	7:53	23.3	3.8	304.5	4	57	4	18	97	58	155
08	9:16	23.1	3.7	290.6	4	98	4	34	138	74	212
09
10	7:52	22.6	3.4	265.0	4	87	4	41	127	81	208
11
12	7:55	22.1	3.2	238.6	4	57	5	53	97	103	200
13
14	7:53	21.6	3.0	212.3	4	40	5	41	80	91	171
15	9:29	21.3	2.9	198.2	3	24	7	24	54	94	148
16	11:07	21.0	2.7	184.1	2	1	7	14	21	84	105
17
18
19	7:51	20.2	2.4	146.3	0	0	6	18	0	78	78
20
21	9:34	19.5	2.1	119.1	2	4	6	22	24	82	106
22	11:24	19.2	2.0	104.9	2	4	6	10	24	70	94
23
24
25
26	7:52	17.9	1.5	54.1	3	9	5	31	39	81	120
27	7:59	17.5	1.4	40.8	3	6	5	36	36	86	122
28
29	10:06	16.8	1.1	13.3	3	24	5	45	54	95	149
30	10:38	16.4	1.0	359.9	5	23	5	78	73	128	201
Monthly mean					3.0	26.3	4.8	28.3	56.3	76.6	132.9
December 2025
Date	Time (JST)	P	B0	L0	North.		South.		Revised Wolf number
					g'	f	g'	f	North.	South.	Total
01
02
03
04	7:53	14.9	0.5	308.6	3	22	6	106	52	166	218
05	7:55	14.5	0.4	295.5	3	23	6	161	53	221	274
06	8:47	14.0	0.3	281.8	3	40	6	149	70	209	279
07	9:31	13.6	0.1	268.2	3	42	6	155	72	215	287
08	9:51	13.2	0.0	254.9	4	34	4	104	74	144	218
09
10	9:14	12.3	-0.3	228.8	4	24	5	52	64	102	166
11
12	7:54	11.5	-0.5	203.2	5	11	6	33	61	93	154
13	9:47	11.0	-0.7	189.0	4	10	7	35	50	105	155
14
15	7:55	10.1	-0.9	163.7	2	10	5	22	30	72	102
16
17	7:53	9.2	-1.2	137.3	3	28	4	13	58	53	111
18
19	9:24	8.3	-1.4	110.2	4	13	3	5	53	35	88
20	9:33	7.8	-1.5	96.9	6	7	1	2	67	12	79
21
22
23	7:55	6.4	-1.9	58.3	7	42	3	15	112	45	157
24
25
26	9:37	5.0	-2.3	17.8	7	21	3	29	91	59	150
27	10:26	4.5	-2.4	4.2	8	40	4	40	120	80	200
28	11:04	4.0	-2.5	350.7	7	48	6	60	118	120	238
29	10:16	3.5	-2.7	338.0	7	35	7	45	105	115	220
30	9:57	3.0	-2.8	325.0	5	54	10	92	104	192	296
31
Monthly mean					4.7	28.0	5.1	62.1	75.2	113.2	188.4

This individual observed result has no garantee of reliability by any public sector organizations.