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103 places · same rules as every spot page
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Iceland (countrywide) vs Tromsø

Two places, side by side, in the same language every spot page uses: the Kp each needs, tonight's live verdict, twelve months of real cloud cover, the season, and how often the sky has reached each threshold this past year.

Between them

Tromsø is clearer in 4 of 6 dark months; Tromsø needs a smaller storm — Kp 1+ against Kp 2+.

Watch point
Iceland (countrywide)
🇮🇸 Iceland · Northern Europe · N
Watch point
Tromsø
🇳🇴 Norway · Northern Europe · N
The Kp each needs
Iceland (countrywide)
Kp 2+
a glow on the horizon · Kp 4 overhead · 64° geomagnetic
on the edge of the oval — you want an active night
Tromsø
needs less
Kp 1+
a glow on the horizon · Kp 3 overhead · 67° geomagnetic
deep under the auroral oval — quiet nights are often enough
Tonight · live
Iceland (countrywide)
Overcast.The sky is clouded over.
peak tonight Kp 4.7 · oval now 0% · 9.3 h dark (~20:24–05:40 local · UTC)
● Full page — live →
Tromsø
Overcast.The sky is clouded over.
peak tonight Kp 4.7 · oval now 0% · 8.7 h dark (~20:09–04:52 local · UTC+2)
● Full page — live →
Clear sky by month · ERA5 climatology
Iceland (countrywide)

Clearest dark months: Jan, Mar, Sep.

Tromsø
clearer

Clearest dark months: Jan, Mar, Oct.

Clear sky = 100 − mean cloud cover; outlined months are each place's three clearest dark months; faint months have no night with an hour of astronomical darkness. ERA5 reanalysis, 2015–2024 monthly mean — climatology, not a forecast; a regional ~25 km grid, local microclimates are not captured. Darkness & moon calendar → Best month, all spots →

Season
Iceland (countrywide)
mid August to late April
when the nights are long and dark
Tromsø
early September to early April
when the nights are long and dark
How often, historically · last 365 days
Iceland (countrywide)
310 / 365
days the global daily-max Kp reached this spot's Kp 2 — GFZ definitive record
Tromsø
more often
361 / 365
days the global daily-max Kp reached this spot's Kp 1 — GFZ definitive record

Kp is a global index — the thresholds are each spot's own, from its geomagnetic latitude; a book spot borrows its parent watch point's geomagnetic fields and climatology row. Tonight's verdict is NOAA Kp + Open-Meteo cloud + the moon, the same call every spot page makes. Best month, all spots → Plan the trip →