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Saint-Jean-sur-Richelieu · April 2027

Northern lights in Saint-Jean-sur-Richelieu in April 2027

Answer

April gives Saint-Jean-sur-Richelieu 9.3 hours of civil night on the 15th, the 8th darkest of its 12 months, under 67% mean cloud. 4% of April days since 1996 reached Kp 6, enough for the oval edge to reach Saint-Jean-sur-Richelieu.
9.3 h
civil night, average night
SunCalc for 45.31, -73.26; NASA POWER; GFZ Kp

April against the rest of the year

April cloud at Saint-Jean-sur-Richelieu averages 67% in NASA POWER's 2001 to 2020 record, 2 points cloudier than its yearly mean. September is Saint-Jean-sur-Richelieu's clearest month at 54%. By civil night times clear sky, April scores 3.1 hours at Saint-Jean-sur-Richelieu, 10th of 12. Trois-Rivières, 128 km away, averages 66%, clearer by 1 points.

Civil night at Saint-Jean-sur-Richelieu starts April at 10 h 6 min and reaches 8 h 33 min by April 30, 1.6 hours shorter. SWPC's 10 PM to 2 AM window is fully dark on every night. True astronomical darkness, the sun 18 degrees down, lasts 6.7 hours on the 15th.

April night by night

April opens toward a new moon on Apr 6, with full moon on Apr 20, in America/Toronto dates. Saint-Jean-sur-Richelieu gets 147 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

    22% lit

    8.8 h

  2. 2

    15% lit

    9.1 h

  3. 3

    8% lit

    9.4 h

  4. 4

    4% lit

    9.7 h

  5. 5

    1% lit

    9.9 h

  6. 6

    0% lit

    9.8 h

  7. 7

    2% lit

    9.1 h

  8. 8

    6% lit

    7.8 h

  9. 9

    12% lit

    6.5 h

  10. 10

    20% lit

    5.2 h

  11. 11

    30% lit

    4.2 h

  12. 12

    41% lit

    3.3 h

  13. 13

    53% lit

    2.6 h

  14. 14

    64% lit

    2.0 h

  15. 15

    74% lit

    1.6 h

  16. 16

    84% lit

    1.2 h

  17. 17

    91% lit

    0.8 h

  18. 18

    96% lit

    0.5 h

  19. 19

    99% lit

    0.1 h

  20. 20

    100% lit

    0.0 h

  21. 21

    98% lit

    0.9 h

  22. 22

    94% lit

    2.0 h

  23. 23

    89% lit

    3.1 h

  24. 24

    82% lit

    4.0 h

  25. 25

    74% lit

    4.8 h

  26. 26

    66% lit

    5.4 h

  27. 27

    57% lit

    5.8 h

  28. 28

    47% lit

    6.2 h

  29. 29

    38% lit

    6.5 h

  30. 30

    29% lit

    6.8 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

Saint-Jean-sur-Richelieu needs Kp 6 for the average oval edge to sit overhead. 37 of the 900 April days from 1996 to 2025 (4%) reached it in the GFZ Potsdam record, 5th of 12 months; storm days with Kp 5 or more made up 12%. Saint-Jean-sur-Richelieu sits at 54.5 degrees geomagnetic. The lowest NOAA storm level whose typical viewing latitude reaches it is G3 (Kp = 7). By SWPC's rule the average oval edge is overhead only at Kp 6.

April across Canada

No month-page town in Canada has more civil night on April 15 than Saint-Jean-sur-Richelieu; the national median is 8.9 hours. Coming from March (11.0 hours at Saint-Jean-sur-Richelieu), April loses darkness, and May brings shorter nights (7.8 hours on the 15th).

Civil night on April 15 and April cloud, month-page towns in Canada
TownCivil nightCloud
Saint-Jean-sur-Richelieu9.3 h67%
Sydney9.3 h73%
Québec9.2 h67%
Greater Sudbury9.2 h64%
Trois-Rivières9.2 h66%
St. John's9.2 h77%
Saguenay9.1 h70%
Thunder Bay9.1 h69%
Lethbridge9.0 h68%
Winnipeg8.9 h61%
Regina8.9 h67%
Kelowna8.9 h71%

Darkness and moon, every night

Saint-Jean-sur-Richelieu, April 2027: each night from local noon to the next noon
NightCivilAstronomicalMoon-free darkMoon-free, 10 PM to 2 AMMoon lit
Thu Apr 110 h 6 min7 h 40 min8 h 49 min4 h22%
Fri Apr 210 h 2 min7 h 36 min9 h 7 min4 h15%
Sat Apr 39 h 59 min7 h 32 min9 h 23 min4 h8%
Sun Apr 49 h 56 min7 h 28 min9 h 40 min4 h4%
Mon Apr 59 h 53 min7 h 24 min9 h 53 min4 h1%
Tue Apr 69 h 49 min7 h 20 min9 h 49 min4 h0%
Wed Apr 79 h 46 min7 h 16 min9 h 5 min4 h2%
Thu Apr 89 h 43 min7 h 12 min7 h 47 min4 h6%
Fri Apr 99 h 39 min7 h 8 min6 h 28 min2 h 44 min12%
Sat Apr 109 h 36 min7 h 4 min5 h 14 min1 h 32 min20%
Sun Apr 119 h 33 min7 h4 h 9 min29 min30%
Mon Apr 129 h 30 min6 h 56 min3 h 16 min0 min41%
Tue Apr 139 h 26 min6 h 52 min2 h 34 min0 min53%
Wed Apr 149 h 23 min6 h 48 min2 h 2 min0 min64%
Thu Apr 159 h 20 min6 h 44 min1 h 35 min0 min74%
Fri Apr 169 h 17 min6 h 39 min1 h 11 min0 min84%
Sat Apr 179 h 13 min6 h 35 min49 min0 min91%
Sun Apr 189 h 10 min6 h 31 min27 min0 min96%
Mon Apr 199 h 7 min6 h 27 min4 min0 min99%
Tue Apr 209 h 4 min6 h 23 min0 min0 min100%
Wed Apr 219 h 1 min6 h 18 min53 min0 min98%
Thu Apr 228 h 57 min6 h 14 min2 h 3 min25 min94%
Fri Apr 238 h 54 min6 h 10 min3 h 6 min1 h 30 min89%
Sat Apr 248 h 51 min6 h 6 min4 h 1 min2 h 27 min82%
Sun Apr 258 h 48 min6 h 1 min4 h 46 min3 h 13 min74%
Mon Apr 268 h 45 min5 h 57 min5 h 22 min3 h 50 min66%
Tue Apr 278 h 42 min5 h 53 min5 h 50 min4 h57%
Wed Apr 288 h 39 min5 h 48 min6 h 13 min4 h47%
Thu Apr 298 h 36 min5 h 44 min6 h 32 min4 h38%
Fri Apr 308 h 33 min5 h 40 min6 h 50 min4 h29%
Moon lit: SunCalc illuminated fraction at the middle of the 10 PM to 2 AM window.

Questions

Can you see the northern lights in Saint-Jean-sur-Richelieu in April?
On dark, clear nights with enough activity. 30 of 30 nights at Saint-Jean-sur-Richelieu have civil darkness, and 4% of past April days reached Kp 6.
How dark is Saint-Jean-sur-Richelieu in April?
Saint-Jean-sur-Richelieu averages 9.3 hours of civil night a night in April 2027, from 10 h 6 min on the 1st to 8 h 33 min on the last night.
How cloudy is Saint-Jean-sur-Richelieu in April?
NASA POWER's 2001 to 2020 climatology gives Saint-Jean-sur-Richelieu's 1 degree cell 67% mean cloud in April, against 65% for the whole year. It is an all-hours average, not a forecast.
What is the best night in April 2027 for aurora in Saint-Jean-sur-Richelieu?
By darkness and moon alone, Apr 1, with 4 h of moon-free darkness inside 10 PM to 2 AM at Saint-Jean-sur-Richelieu. Activity on that date will only be known hours ahead.
Is April or May better in Saint-Jean-sur-Richelieu?
By civil night times the clear share, April scores 3.1 hours at Saint-Jean-sur-Richelieu and May 2.7. 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.