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Tromsdalen · April 2027

Northern lights in Tromsdalen in April 2027

Answer

April gives Tromsdalen 4.8 hours of civil night on the 15th, the 8th darkest of its 12 months, under 81% mean cloud. 12% of April days since 1996 reached storm level, Kp 5.
4.3 h
civil night, average night
SunCalc for 69.65, 19.02; NASA POWER; GFZ Kp

April against the rest of the year

April cloud at Tromsdalen averages 81% in NASA POWER's 2001 to 2020 record, close to its yearly mean of 82%. July is Tromsdalen's clearest month at 79%. By civil night times clear sky, April scores 0.9 hours at Tromsdalen, 8th of 12. Tromsø, 2 km away, averages the same 81%.

Civil night at Tromsdalen starts April at 7 h 33 min and reaches 0 min by April 30, 7.5 hours shorter. 4 Tromsdalen nights this month have no civil darkness at all. The 10 PM to 2 AM window is fully dark on 12 of 30 nights. The sun never reaches 18 degrees down, so Tromsdalen 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 Europe/Oslo dates. Tromsdalen gets 62 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 (4 h), Apr 2 (4 h), Apr 3 (4 h).

  1. 1

    24% lit

    7.5 h

  2. 2

    16% lit

    7.4 h

  3. 3

    10% lit

    7.2 h

  4. 4

    5% lit

    7.0 h

  5. 5

    1% lit

    6.9 h

  6. 6

    0% lit

    6.7 h

  7. 7

    1% lit

    5.7 h

  8. 8

    5% lit

    0.0 h

  9. 9

    10% lit

    0.0 h

  10. 10

    18% lit

    0.0 h

  11. 11

    28% lit

    0.0 h

  12. 12

    38% lit

    0.0 h

  13. 13

    50% lit

    0.0 h

  14. 14

    61% lit

    0.0 h

  15. 15

    72% lit

    0.0 h

  16. 16

    81% lit

    0.0 h

  17. 17

    89% lit

    0.0 h

  18. 18

    95% lit

    0.0 h

  19. 19

    99% lit

    0.0 h

  20. 20

    100% lit

    0.0 h

  21. 21

    99% lit

    3.3 h

  22. 22

    96% lit

    3.0 h

  23. 23

    91% lit

    2.6 h

  24. 24

    84% lit

    2.2 h

  25. 25

    76% lit

    1.8 h

  26. 26

    68% lit

    1.1 h

  27. 27

    59% lit

    no night

  28. 28

    49% lit

    no night

  29. 29

    40% lit

    no night

  30. 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 Tromsdalen, so storm days matter more: 106 of the 900 April days from 1996 to 2025 (12%) reached Kp 5, 4th of 12 months. Tromsdalen sits at 67.5 degrees geomagnetic, inside SWPC's 60 to 75 degree band, where aurora can be seen on more than half of all nights. No storm is needed: by SWPC's rule the average oval edge is overhead at Kp 0.

April across Norway

Tromsdalen ranks 19th in Norway for civil night on April 15, behind Kristiansand at 8.0 hours. Coming from March (10.2 hours at Tromsdalen), April loses darkness, and May brings shorter nights (0.0 hours on the 15th).

Civil night on April 15 and April cloud, month-page towns in Norway
TownCivil nightCloud
Kristiansand8.0 h74%
Stavanger7.9 h74%
Haugesund7.8 h74%
Oslo7.7 h70%
Drammen7.7 h70%
Bergen7.6 h72%
Hamar7.5 h66%
Lillehammer7.5 h70%
Gjøvik7.5 h66%
Ålesund7.2 h82%
Kristiansund7.1 h73%
Molde7.1 h82%
Tromsdalen4.8 h81%

Darkness and moon, every night

Tromsdalen, April 2027: each night from local noon to the next noon
NightCivilAstronomicalMoon-free darkMoon-free, 10 PM to 2 AMMoon lit
Thu Apr 17 h 33 min0 min7 h 33 min4 h24%
Fri Apr 27 h 23 min0 min7 h 23 min4 h16%
Sat Apr 37 h 13 min0 min7 h 13 min4 h10%
Sun Apr 47 h 2 min0 min7 h 2 min4 h5%
Mon Apr 56 h 52 min0 min6 h 52 min4 h1%
Tue Apr 66 h 41 min0 min6 h 41 min4 h0%
Wed Apr 76 h 30 min0 min5 h 39 min3 h 38 min1%
Thu Apr 86 h 19 min0 min0 min0 min5%
Fri Apr 96 h 7 min0 min0 min0 min10%
Sat Apr 105 h 56 min0 min0 min0 min18%
Sun Apr 115 h 44 min0 min0 min0 min28%
Mon Apr 125 h 32 min0 min0 min0 min38%
Tue Apr 135 h 19 min0 min0 min0 min50%
Wed Apr 145 h 6 min0 min0 min0 min61%
Thu Apr 154 h 53 min0 min0 min0 min72%
Fri Apr 164 h 39 min0 min0 min0 min81%
Sat Apr 174 h 25 min0 min0 min0 min89%
Sun Apr 184 h 10 min0 min0 min0 min95%
Mon Apr 193 h 54 min0 min0 min0 min99%
Tue Apr 203 h 37 min0 min0 min0 min100%
Wed Apr 213 h 20 min0 min3 h 20 min2 h 58 min99%
Thu Apr 223 h0 min3 h2 h 48 min96%
Fri Apr 232 h 39 min0 min2 h 39 min2 h 38 min91%
Sat Apr 242 h 14 min0 min2 h 14 min2 h 14 min84%
Sun Apr 251 h 45 min0 min1 h 45 min1 h 45 min76%
Mon Apr 261 h 4 min0 min1 h 4 min1 h 4 min68%
Tue Apr 270 min0 min0 min0 min59%
Wed Apr 280 min0 min0 min0 min49%
Thu Apr 290 min0 min0 min0 min40%
Fri Apr 300 min0 min0 min0 min31%
Moon lit: SunCalc illuminated fraction at the middle of the 10 PM to 2 AM window.

Questions

Can you see the northern lights in Tromsdalen in April?
On dark, clear nights with enough activity. 26 of 30 nights at Tromsdalen have civil darkness, and 12% of past April days reached Kp 5.
How dark is Tromsdalen in April?
Tromsdalen averages 4.3 hours of civil night a night in April 2027, from 7 h 33 min on the 1st to 0 min on the last night.
How cloudy is Tromsdalen in April?
NASA POWER's 2001 to 2020 climatology gives Tromsdalen's 1 degree cell 81% mean cloud in April, against 82% for the whole year. It is an all-hours average, not a forecast.
What is the best night in April 2027 for aurora in Tromsdalen?
By darkness and moon alone, Apr 1, with 4 h of moon-free darkness inside 10 PM to 2 AM at Tromsdalen. Activity on that date will only be known hours ahead.
Is April or May better in Tromsdalen?
By civil night times the clear share, April scores 0.9 hours at Tromsdalen and May 0.0. April comes out ahead.

Sources and verification

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.