Can you see the northern lights in Longyearbyen in April?

On dark, clear nights with enough activity. 2 of 30 nights at Longyearbyen have civil darkness, and 12% of past April days reached Kp 5.

How dark is Longyearbyen in April?

Longyearbyen averages 0.1 hours of civil night a night in April 2027, from 2 h 21 min on the 1st to 0 min on the last night.

How cloudy is Longyearbyen in April?

NASA POWER's 2001 to 2020 climatology gives Longyearbyen's 1 degree cell 67% mean cloud in April, against 76% for the whole year. It is an all-hours average, not a forecast.

What is the best night in April 2027 for aurora in Longyearbyen?

By darkness and moon alone, Apr 1, with 2 h 11 min of moon-free darkness inside 10 PM to 2 AM at Longyearbyen. Activity on that date will only be known hours ahead.

Is April or May better in Longyearbyen?

By civil night times the clear share, April scores 0.0 hours at Longyearbyen and May 0.0. They are level.

Longyearbyen · April 2027

Northern lights in Longyearbyen in April 2027

Answer

April gives Longyearbyen 0.0 hours of civil night on the 15th, the 8th darkest of its 12 months, under 67% mean cloud. 12% of April days since 1996 reached storm level, Kp 5.

0.1 h

civil night, average night

SunCalc for 78.22, 15.65; NASA POWER; GFZ Kp

April against the rest of the year

6.2

4.5

2.7

0.0

0.9

2.8

5.8

6.2

April cloud at Longyearbyen averages 67% in NASA POWER's 2001 to 2020 record, 9 points clearer than its yearly mean. No month at Longyearbyen is clearer. By civil night times clear sky, April scores 0.0 hours at Longyearbyen, 8th of 12. Alta, 945 km away, averages 76%, cloudier by 9 points.

Civil night at Longyearbyen starts April at 2 h 21 min and reaches 0 min by April 30, 2.4 hours shorter. 28 Longyearbyen nights this month have no civil darkness at all. No night keeps the 10 PM to 2 AM window fully dark at Longyearbyen. The sun never reaches 18 degrees down, so Longyearbyen gets no astronomical night in April.

April night by night

April opens toward a new moon on Apr 7, with full moon on Apr 21, in Arctic/Longyearbyen dates. Longyearbyen gets 4 hours of civil night with the moon below the horizon across the month. The best of them for moon-free darkness inside 10 PM to 2 AM: Apr 1 (2 h 11 min), Apr 2 (1 h 18 min).

1
24% lit
2.4 h
2
16% lit
1.3 h
3
10% lit
no night
4
5% lit
no night
5
1% lit
no night
6
0% lit
no night
7
1% lit
no night
New
8
5% lit
no night
9
10% lit
no night
10
18% lit
no night
11
28% lit
no night
12
38% lit
no night
13
50% lit
no night
14
61% lit
no night
15
72% lit
no night
16
81% lit
no night
17
89% lit
no night
18
95% lit
no night
19
99% lit
no night
20
100% lit
no night
21
99% lit
no night
Full
22
96% lit
no night
23
91% lit
no night
24
84% lit
no night
25
76% lit
no night
26
68% lit
no night
27
59% lit
no night
28
49% lit
no night
29
40% lit
no night
30
31% lit
no night

Each cell is the night that starts on that date. Hours are civil-dark time with the moon below the horizon; the green rule scales with them. Green outline: new moon. Bone outline: full moon.

Activity in past Aprils

Quiet activity already puts the oval edge over Longyearbyen, so storm days matter more: 106 of the 900 April days from 1996 to 2025 (12%) reached Kp 5, 4th of 12 months. Longyearbyen sits at 75.3 degrees geomagnetic, poleward of SWPC's 60 to 75 degree band. The quiet oval can lie south of the town, so aurora often shows low in the southern sky, and storms push the oval farther south.

April across Svalbard and Jan Mayen

Coming from March (8.9 hours at Longyearbyen), April loses darkness, and May holds about the same.

Darkness and moon, every night

Longyearbyen, April 2027: each night from local noon to the next noon
Night	Civil	Moon-free dark	Moon-free, 10 PM to 2 AM	Moon lit
Thu Apr 1	2 h 21 min	2 h 21 min	2 h 11 min	24%
Fri Apr 2	1 h 18 min	1 h 18 min	1 h 18 min	16%
Sat Apr 3	0 min	0 min	0 min	10%
Sun Apr 4	0 min	0 min	0 min	5%
Mon Apr 5	0 min	0 min	0 min	1%
Tue Apr 6	0 min	0 min	0 min	0%
Wed Apr 7	0 min	0 min	0 min	1%
Thu Apr 8	0 min	0 min	0 min	5%
Fri Apr 9	0 min	0 min	0 min	10%
Sat Apr 10	0 min	0 min	0 min	18%
Sun Apr 11	0 min	0 min	0 min	28%
Mon Apr 12	0 min	0 min	0 min	38%
Tue Apr 13	0 min	0 min	0 min	50%
Wed Apr 14	0 min	0 min	0 min	61%
Thu Apr 15	0 min	0 min	0 min	72%
Fri Apr 16	0 min	0 min	0 min	81%
Sat Apr 17	0 min	0 min	0 min	89%
Sun Apr 18	0 min	0 min	0 min	95%
Mon Apr 19	0 min	0 min	0 min	99%
Tue Apr 20	0 min	0 min	0 min	100%
Wed Apr 21	0 min	0 min	0 min	99%
Thu Apr 22	0 min	0 min	0 min	96%
Fri Apr 23	0 min	0 min	0 min	91%
Sat Apr 24	0 min	0 min	0 min	84%
Sun Apr 25	0 min	0 min	0 min	76%
Mon Apr 26	0 min	0 min	0 min	68%
Tue Apr 27	0 min	0 min	0 min	59%
Wed Apr 28	0 min	0 min	0 min	49%
Thu Apr 29	0 min	0 min	0 min	40%
Fri Apr 30	0 min	0 min	0 min	31%

Moon lit: SunCalc illuminated fraction at the middle of the 10 PM to 2 AM window.

Questions

Can you see the northern lights in Longyearbyen in April?: On dark, clear nights with enough activity. 2 of 30 nights at Longyearbyen have civil darkness, and 12% of past April days reached Kp 5.
How dark is Longyearbyen in April?: Longyearbyen averages 0.1 hours of civil night a night in April 2027, from 2 h 21 min on the 1st to 0 min on the last night.
How cloudy is Longyearbyen in April?: NASA POWER's 2001 to 2020 climatology gives Longyearbyen's 1 degree cell 67% mean cloud in April, against 76% for the whole year. It is an all-hours average, not a forecast.
What is the best night in April 2027 for aurora in Longyearbyen?: By darkness and moon alone, Apr 1, with 2 h 11 min of moon-free darkness inside 10 PM to 2 AM at Longyearbyen. Activity on that date will only be known hours ahead.
Is April or May better in Longyearbyen?: By civil night times the clear share, April scores 0.0 hours at Longyearbyen and May 0.0. They are level.

Sources and verification

SunCalchttps://github.com/mourner/suncalc
NASA POWER climatologyhttps://power.larc.nasa.gov/docs/services/api/temporal/climatology/
GFZ Potsdam Kp indexhttps://kp.gfz.de/en/data
NOAA SWPC, Tips on viewing the aurorahttps://www.spaceweather.gov/content/tips-viewing-aurora

Quoted figures last checked against their sources on 2026-09-30; next review 2026-12-31. Computed figures come from SunCalc and the IGRF-14 dipole as described in the methodology. Every quote is listed in the sources ledger.