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Udachny · April 2027

Northern lights in Udachny in April 2027

Answer

April gives Udachny 6.2 hours of civil night on the 15th, the 8th darkest of its 12 months, under 63% mean cloud. 12% of April days since 1996 reached Kp 5, enough for the oval edge to reach Udachny.
6.1 h
civil night, average night
SunCalc for 66.43, 112.40; NASA POWER; GFZ Kp

April against the rest of the year

April cloud at Udachny averages 63% in NASA POWER's 2001 to 2020 record, 3 points cloudier than its yearly mean. February is Udachny's clearest month at 40%. By civil night times clear sky, April scores 2.3 hours at Udachny, 6th of 12. Talnakh, 1,050 km away, averages 67%, cloudier by 4 points.

Civil night at Udachny starts April at 8 h 16 min and reaches 3 h 27 min by April 30, 4.8 hours shorter. The 10 PM to 2 AM window is fully dark on 10 of 30 nights. The sun never reaches 18 degrees down, so Udachny 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 Asia/Yakutsk dates. Udachny gets 100 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

    27% lit

    8.3 h

  2. 2

    19% lit

    8.1 h

  3. 3

    12% lit

    8.0 h

  4. 4

    6% lit

    7.8 h

  5. 5

    2% lit

    7.7 h

  6. 6

    0% lit

    7.6 h

  7. 7

    1% lit

    7.2 h

  8. 8

    3% lit

    5.0 h

  9. 9

    8% lit

    1.0 h

  10. 10

    16% lit

    0.0 h

  11. 11

    25% lit

    0.0 h

  12. 12

    35% lit

    0.0 h

  13. 13

    46% lit

    0.0 h

  14. 14

    58% lit

    0.0 h

  15. 15

    69% lit

    0.0 h

  16. 16

    79% lit

    0.0 h

  17. 17

    87% lit

    0.0 h

  18. 18

    94% lit

    0.0 h

  19. 19

    98% lit

    0.0 h

  20. 20

    100% lit

    0.0 h

  21. 21

    99% lit

    0.8 h

  22. 22

    97% lit

    5.1 h

  23. 23

    92% lit

    4.9 h

  24. 24

    86% lit

    4.7 h

  25. 25

    79% lit

    4.5 h

  26. 26

    71% lit

    4.3 h

  27. 27

    62% lit

    4.1 h

  28. 28

    52% lit

    3.9 h

  29. 29

    43% lit

    3.7 h

  30. 30

    33% lit

    3.5 h

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

Udachny needs Kp 5 for the average oval edge to sit overhead. 106 of the 900 April days from 1996 to 2025 (12%) reached it in the GFZ Potsdam record, 4th of 12 months; storm days with Kp 5 or more made up 12%. Udachny sits at 57.2 degrees geomagnetic. By SWPC's rule the average oval edge is overhead at Kp 5, and aurora is usually visible on the northern horizon at G1 (Kp 5) or less.

April across Russia

Udachny ranks 12th in Russia for civil night on April 15, behind Velikiy Novgorod at 7.9 hours. Coming from March (10.4 hours at Udachny), 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 Russia
TownCivil nightCloud
Velikiy Novgorod7.9 h65%
Saint Petersburg7.7 h66%
Kolpino7.7 h66%
Petrozavodsk7.4 h73%
Syktyvkar7.4 h69%
Noyabrsk7.1 h69%
Ukhta7.0 h70%
Arkhangel'sk6.7 h72%
Severodvinsk6.7 h73%
Kostomuksha6.7 h72%
Anadyr6.7 h67%
Udachny6.2 h63%

Darkness and moon, every night

Udachny, April 2027: each night from local noon to the next noon
NightCivilAstronomicalMoon-free darkMoon-free, 10 PM to 2 AMMoon lit
Thu Apr 18 h 16 min1 h 29 min8 h 16 min4 h27%
Fri Apr 28 h 8 min33 min8 h 8 min4 h19%
Sat Apr 38 h0 min8 h4 h12%
Sun Apr 47 h 51 min0 min7 h 51 min4 h6%
Mon Apr 57 h 43 min0 min7 h 43 min4 h2%
Tue Apr 67 h 34 min0 min7 h 34 min4 h0%
Wed Apr 77 h 26 min0 min7 h 14 min3 h 59 min1%
Thu Apr 87 h 17 min0 min5 h 2 min1 h 52 min3%
Fri Apr 97 h 9 min0 min1 h 1 min0 min8%
Sat Apr 107 h0 min0 min0 min16%
Sun Apr 116 h 51 min0 min0 min0 min25%
Mon Apr 126 h 42 min0 min0 min0 min35%
Tue Apr 136 h 33 min0 min0 min0 min46%
Wed Apr 146 h 24 min0 min0 min0 min58%
Thu Apr 156 h 14 min0 min0 min0 min69%
Fri Apr 166 h 5 min0 min0 min0 min79%
Sat Apr 175 h 55 min0 min0 min0 min87%
Sun Apr 185 h 45 min0 min0 min0 min94%
Mon Apr 195 h 35 min0 min0 min0 min98%
Tue Apr 205 h 25 min0 min0 min0 min100%
Wed Apr 215 h 15 min0 min48 min47 min99%
Thu Apr 225 h 4 min0 min5 h 4 min3 h 4 min97%
Fri Apr 234 h 53 min0 min4 h 53 min2 h 58 min92%
Sat Apr 244 h 42 min0 min4 h 42 min2 h 53 min86%
Sun Apr 254 h 30 min0 min4 h 30 min2 h 47 min79%
Mon Apr 264 h 19 min0 min4 h 19 min2 h 42 min71%
Tue Apr 274 h 7 min0 min4 h 7 min2 h 36 min62%
Wed Apr 283 h 54 min0 min3 h 54 min2 h 30 min52%
Thu Apr 293 h 41 min0 min3 h 41 min2 h 23 min43%
Fri Apr 303 h 27 min0 min3 h 27 min2 h 16 min33%
Moon lit: SunCalc illuminated fraction at the middle of the 10 PM to 2 AM window.

Questions

Can you see the northern lights in Udachny in April?
On dark, clear nights with enough activity. 30 of 30 nights at Udachny have civil darkness, and 12% of past April days reached Kp 5.
How dark is Udachny in April?
Udachny averages 6.1 hours of civil night a night in April 2027, from 8 h 16 min on the 1st to 3 h 27 min on the last night.
How cloudy is Udachny in April?
NASA POWER's 2001 to 2020 climatology gives Udachny's 1 degree cell 63% mean cloud in April, against 60% for the whole year. It is an all-hours average, not a forecast.
What is the best night in April 2027 for aurora in Udachny?
By darkness and moon alone, Apr 1, with 4 h of moon-free darkness inside 10 PM to 2 AM at Udachny. Activity on that date will only be known hours ahead.
Is April or May better in Udachny?
By civil night times the clear share, April scores 2.3 hours at Udachny 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.