Kp index — May 2025
The Kp archive
GFZ definitive record · 3-hour UTC intervals · 1932 → 2026-07-31
Max Kp
6.3
17 May · G2
Storm nights
12
G1×10G2×2
Time at storm level
11.3%
intervals at Kp ≥ 5−
Avg Kp
2.8
all intervals
Tap a day — its eight intervals open here.
Highlights
- G2 storm · May 17–18 · peak Kp 6.3
- 12 storm nights — most in a month since 2005
2025 · the year at a glance — storm nights by month · year peak Kp 8.7
All-time record: Kp 9.0 — reached on 27 days, most recently 2024-05-11.