Home > Observation data > Monthly overview > Monthly overview (Dec 2025)

Monthly overview (Dec 2025)

The monthly mean values of the geomagnetic field components at Kakioka are D: -7°-59.1′°, H: 30120nT, Z: 36013nT and F: 46948nT for December 2025.

Monthly average of the K-index daily sum is 17.4. indicates a high level of geomagnetic activity during the month.

Notable geomagnetic events include 2 magnetic storms, 2 si, 10 bay, 1 sfe, 6 pi and 2 pc.

The international 5 quietest days are the 8,9,14,15,20^th.

The international 5 most disturbed days are the 3,4,11,12,21^th.

Date	K-index daily sum	Geomagnetic activity	International 5 quietest days	International 5 quietest days	geomagnetic 1-minute value plot
1	17	moderately disturbed			plot
2	13	moderately calm			plot
3	25	disturbed		○	plot
4	29	disturbed		○	plot
5	21	moderately disturbed			plot
6	22	moderately disturbed			plot
7	10	calm			plot
8	5	calm	○		plot
9	6	calm	○		plot
10	21	moderately disturbed			plot
11	28	disturbed		○	plot
12	27	disturbed		○	plot
13	20	moderately disturbed			plot
14	10	calm	○		plot
15	9	calm	○		plot
16	17	moderately disturbed			plot
17	20	moderately disturbed			plot
18	21	moderately disturbed			plot
19	10	calm			plot
20	10	calm	○		plot
21	29	disturbed		○	plot
22	24	disturbed			plot
23	22	moderately disturbed			plot
24	23	disturbed			plot
25	17	moderately disturbed			plot
26	12	moderately calm			plot
27	13	moderately calm			plot
28	11	moderately calm			plot
29	14	moderately calm			plot
30	16	moderately calm			plot
31	17	moderately disturbed			plot

*) Plot diagram opens in a separate window.