Tromsø, Norway
Tier 1 · needs Kp 2 · Bortle 4. Live answer for Tromsø tonight.
Crunching NOAA Kp, cloud cover, moon phase and darkness for Murmansk…
connecting to NOAA SWPC + Open-Meteo…
Murmansk sits close enough to the auroral oval that the northern lights are a routine winter occurrence rather than a special event.
Murmansk needs only Kp 1 and is the largest city anywhere north of the Arctic Circle. Its magnetic latitude of 68.9°N puts it under the auroral oval, and it spends roughly six weeks of each winter in polar night, when the sun does not rise at all — so the aurora here can appear in what would otherwise be the middle of the working day.
Counted properly, Murmansk gets 190 nights of astronomical darkness a year. They begin around **17 Sep** and end about **25 Mar**, and inside that window the sky is dark enough that the only things standing between you and a display are cloud and geomagnetic activity. The counter-season is just as clearly defined: from about **26 Mar** to **16 Sep** (175 nights) the sun never gets 18° below the horizon, so the sky never reaches full darkness, and between roughly 11 Apr and 31 Aug it does not get properly dark at all — no display, however strong, is visible in that stretch.
The sun stays above the horizon at solar midnight for about 63 days a year here, and on its deepest night it only drops to 44.5° below the horizon — after which it is climbing again. This is why our engine returns NO for Murmansk through the summer regardless of the Kp forecast: the aurora may well be there, but the sky is not dark.
The city is a major port and unusually bright for its latitude, so the outskirts and the roads leading away from the harbour are where you need to be; the open tundra beyond the city has almost no light at all.
One practical rule covers most of it: from Murmansk the aurora appears in the northern sky, so plan the spot around that view rather than the forecast. The "best window" above is the earliest hour tonight where cloud cover drops below roughly 40% and the sky at this latitude is genuinely dark.
Here is what each Kp value would actually put in Murmansk's sky — the row that matters is the one at Kp 1, which is where this city's magnetic latitude of 68.9° places its threshold:
| Kp index | What you'd see from Murmansk |
|---|---|
| Kp 0 | Marginal: expect at most a dull arc low in the north, and only away from town. A camera will pull more colour out of this than your eyes will. |
| Kp 1 | Visible low on the northern horizon from Murmansk — active arcs, and movement you can see with the naked eye. Worth clearing an evening for if the cloud cooperates. |
| Kp 2 | A good display: brighter arcs, rays climbing higher, curtains beginning to form overhead. Any genuinely open horizon will do at this level. |
| Kp 3 | A big night: the lights are overhead rather than on the horizon, moving quickly and showing strong colour. Get out early: big displays often peak within an hour of the substorm. |
| Kp 4 | Once-a-cycle territory (G4–G5). Displays of this size have been seen overhead at latitudes like Murmansk's. Watch the live forecast through the evening; this level can build quickly. |
| Kp 5 | Severe storm (G4–G5): the aurora reaches deep into mid-latitudes. From Murmansk, look straight up — it can be everywhere. Find a wide-open horizon — at this level the display can move overhead. |
| Kp 6 | Exceptional event (G4–G5). At this level the display can fill the whole sky above Murmansk, not just the northern horizon. Rare enough that it is worth cancelling other plans for. |
| Kp 7 | Once-a-cycle territory (G4–G5). Displays of this size have been seen overhead at latitudes like Murmansk's. Watch the live forecast through the evening; this level can build quickly. |
| Kp 8 | Exceptional event (G4–G5). At this level the display can fill the whole sky above Murmansk, not just the northern horizon. Find a wide-open horizon — at this level the display can move overhead. |
| Kp 9 | Once-a-cycle territory (G4–G5). Displays of this size have been seen overhead at latitudes like Murmansk's. Rare enough that it is worth cancelling other plans for. |
The most common reason people miss a display at this latitude is timing rather than strength: a Kp 1 night is enough, but substorms come and go inside a single Kp interval, so a 20-minute gap in your attention can be the whole show. Check the sky every 20–30 minutes rather than once.
The score above is built from five weighted factors, each using Murmansk's own figures rather than a regional default: Kp against a local threshold of 1 (35%), cloud cover averaged across the dark hours at 68.97°, 33.08° (25%), moon illumination (15%), this latitude's astronomical darkness window (15%) and Bortle 6 light pollution (10%). The method, its data sources and its known limitations are documented on our methodology page. No signup, no app, no account — the page computes everything in your browser from NOAA and Open-Meteo directly. Anonymous analytics and Google's advertising script are the only third parties involved, and both are set out on our privacy page.
Watch for Kp 1. The table further up this page walks through each index value for Murmansk specifically, but the short version is that 1 is the first level where a clear sky is likely to reward you, and Kp 3 is where the display stops being subtle. It is a magnetic-latitude figure (68.9°), so it does not shift with the seasons or the solar cycle — only with how the field happens to be behaving on the night.
Very dark in mid-winter, not dark at all in mid-summer. The sun sits 44.5° below the horizon on the darkest night of the year, yet never sets for about 63 days around the solstice — which is why the answer above returns NO through the summer.
In principle, but not on a typical night. With Bortle 6 skies, Murmansk's light dome hides everything short of a bright, active display. The difference between watching from the centre and watching from dark ground half an hour away is not marginal — it is the difference between a grey smudge and something you will remember.
The season here is set by the sun rather than the calendar: full astronomical darkness runs from about 17 Sep to about 25 Mar, 190 nights in total. The 175 nights between roughly 26 Mar and 16 Sep never get dark enough, and the engine returns NO through them rather than overstating what you would see.
Five inputs, all recomputed every 15 minutes: the NOAA SWPC Kp forecast (accurate to about 12 hours), cloud cover for Murmansk's coordinates from Open-Meteo, moon phase, this latitude's darkness window, and Bortle 6 light pollution. The engine is deliberately willing to say MAYBE or NO rather than overstate — including on the 175 nights a year when the sky here cannot get dark enough to see anything at all.
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