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Saint-Jérôme · March 2027

Northern lights in Saint-Jérôme in March 2027

Answer

March gives Saint-Jérôme 11.0 hours of civil night on the 15th, the 6th darkest of its 12 months, under 64% mean cloud. 3% of March days since 1996 reached Kp 6, enough for the oval edge to reach Saint-Jérôme.
11.0 h
civil night, average night
SunCalc for 45.78, -74.00; NASA POWER; GFZ Kp

March against the rest of the year

March cloud at Saint-Jérôme averages 64% in NASA POWER's 2001 to 2020 record, close to its yearly mean of 64%. September is Saint-Jérôme's clearest month at 54%. By civil night times clear sky, March scores 4.0 hours at Saint-Jérôme, 4th of 12. Trois-Rivières, 129 km away, averages 62%, clearer by 2 points.

Civil night at Saint-Jérôme starts March at 11 h 45 min and reaches 10 h 8 min by March 31, 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 8.7 hours on the 15th.

March night by night

March opens toward a new moon on Mar 8, with full moon on Mar 22, in America/Toronto dates. Saint-Jérôme gets 187 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: Mar 1 (4 h), Mar 2 (4 h), Mar 3 (4 h).

  1. 1

    32% lit

    9.6 h

  2. 2

    23% lit

    10.2 h

  3. 3

    16% lit

    10.7 h

  4. 4

    9% lit

    11.1 h

  5. 5

    5% lit

    11.4 h

  6. 6

    1% lit

    11.5 h

  7. 7

    0% lit

    11.4 h

  8. 8

    1% lit

    11.3 h

  9. 9

    4% lit

    10.2 h

  10. 10

    8% lit

    8.9 h

  11. 11

    15% lit

    7.7 h

  12. 12

    24% lit

    6.4 h

  13. 13

    34% lit

    5.1 h

  14. 14

    44% lit

    3.9 h

  15. 15

    56% lit

    2.9 h

  16. 16

    67% lit

    2.1 h

  17. 17

    77% lit

    1.4 h

  18. 18

    86% lit

    0.9 h

  19. 19

    93% lit

    0.5 h

  20. 20

    98% lit

    0.1 h

  21. 21

    100% lit

    0.0 h

  22. 22

    99% lit

    0.2 h

  23. 23

    96% lit

    1.4 h

  24. 24

    91% lit

    2.7 h

  25. 25

    84% lit

    3.9 h

  26. 26

    76% lit

    5.0 h

  27. 27

    68% lit

    6.0 h

  28. 28

    58% lit

    6.8 h

  29. 29

    49% lit

    7.5 h

  30. 30

    40% lit

    8.1 h

  31. 31

    31% lit

    8.5 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 Marchs

Saint-Jérôme needs Kp 6 for the average oval edge to sit overhead. 30 of the 930 March days from 1996 to 2025 (3%) reached it in the GFZ Potsdam record, 6th of 12 months; storm days with Kp 5 or more made up 12%. Saint-Jérôme sits at 55.0 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.

March across Canada

No month-page town in Canada has more civil night on March 15 than Saint-Jérôme; the national median is 10.9 hours. Coming from February (12.5 hours at Saint-Jérôme), March loses darkness, and April brings shorter nights (9.3 hours on the 15th). The March equinox falls on March 20, 16:25 Saint-Jérôme time, inside the weeks SWPC links with larger storms.

Civil night on March 15 and March cloud, month-page towns in Canada
TownCivil nightCloud
Saint-Jérôme11.0 h64%
Québec11.0 h63%
Greater Sudbury11.0 h60%
Saguenay11.0 h66%
Trois-Rivières11.0 h62%
St. John's11.0 h80%
Thunder Bay11.0 h67%
Sydney11.0 h77%
Calgary10.9 h72%
Edmonton10.9 h72%
Winnipeg10.9 h61%
Saskatoon10.9 h68%

Darkness and moon, every night

Saint-Jérôme, March 2027: each night from local noon to the next noon
NightCivilAstronomicalMoon-free darkMoon-free, 10 PM to 2 AMMoon lit
Mon Mar 111 h 45 min9 h 27 min9 h 34 min4 h32%
Tue Mar 211 h 42 min9 h 24 min10 h 11 min4 h23%
Wed Mar 311 h 39 min9 h 21 min10 h 39 min4 h16%
Thu Mar 411 h 36 min9 h 18 min11 h 3 min4 h9%
Fri Mar 511 h 33 min9 h 14 min11 h 22 min4 h5%
Sat Mar 611 h 30 min9 h 11 min11 h 30 min4 h1%
Sun Mar 711 h 26 min9 h 8 min11 h 26 min4 h0%
Mon Mar 811 h 23 min9 h 4 min11 h 21 min4 h1%
Tue Mar 911 h 20 min9 h 1 min10 h 10 min4 h4%
Wed Mar 1011 h 17 min8 h 58 min8 h 56 min4 h8%
Thu Mar 1111 h 14 min8 h 54 min7 h 40 min3 h 58 min15%
Fri Mar 1211 h 10 min8 h 51 min6 h 23 min2 h 42 min24%
Sat Mar 1311 h 7 min8 h 47 min5 h 6 min27 min34%
Sun Mar 1411 h 4 min8 h 44 min3 h 54 min0 min44%
Mon Mar 1511 h 1 min8 h 40 min2 h 53 min0 min56%
Tue Mar 1610 h 57 min8 h 37 min2 h 4 min0 min67%
Wed Mar 1710 h 54 min8 h 33 min1 h 25 min0 min77%
Thu Mar 1810 h 51 min8 h 30 min54 min0 min86%
Fri Mar 1910 h 47 min8 h 26 min29 min0 min93%
Sat Mar 2010 h 44 min8 h 22 min6 min0 min98%
Sun Mar 2110 h 41 min8 h 19 min0 min0 min100%
Mon Mar 2210 h 38 min8 h 15 min12 min0 min99%
Tue Mar 2310 h 34 min8 h 11 min1 h 27 min0 min96%
Wed Mar 2410 h 31 min8 h 7 min2 h 41 min27 min91%
Thu Mar 2510 h 28 min8 h 4 min3 h 53 min1 h 40 min84%
Fri Mar 2610 h 24 min8 h5 h2 h 49 min76%
Sat Mar 2710 h 21 min7 h 56 min6 h3 h 50 min68%
Sun Mar 2810 h 18 min7 h 52 min6 h 50 min4 h58%
Mon Mar 2910 h 14 min7 h 48 min7 h 31 min4 h49%
Tue Mar 3010 h 11 min7 h 45 min8 h 3 min4 h40%
Wed Mar 3110 h 8 min7 h 41 min8 h 28 min4 h31%
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-Jérôme in March?
On dark, clear nights with enough activity. 31 of 31 nights at Saint-Jérôme have civil darkness, and 3% of past March days reached Kp 6.
How dark is Saint-Jérôme in March?
Saint-Jérôme averages 11.0 hours of civil night a night in March 2027, from 11 h 45 min on the 1st to 10 h 8 min on the last night.
How cloudy is Saint-Jérôme in March?
NASA POWER's 2001 to 2020 climatology gives Saint-Jérôme's 1 degree cell 64% mean cloud in March, against 64% for the whole year. It is an all-hours average, not a forecast.
What is the best night in March 2027 for aurora in Saint-Jérôme?
By darkness and moon alone, Mar 1, with 4 h of moon-free darkness inside 10 PM to 2 AM at Saint-Jérôme. Activity on that date will only be known hours ahead.
Is March or April better in Saint-Jérôme?
By civil night times the clear share, March scores 4.0 hours at Saint-Jérôme and April 3.3. March 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.