How dark is Rivière-des-Prairies-Pointe-aux-Trembles in August?

Rivière-des-Prairies-Pointe-aux-Trembles averages 8.8 hours of civil night a night in August 2027, from 8 h 1 min on the 1st to 9 h 34 min on the last night.

How cloudy is Rivière-des-Prairies-Pointe-aux-Trembles in August?

NASA POWER's 2001 to 2020 climatology gives Rivière-des-Prairies-Pointe-aux-Trembles's 1 degree cell 57% mean cloud in August, against 65% for the whole year. It is an all-hours average, not a forecast.

What is the best night in August 2027 for aurora in Rivière-des-Prairies-Pointe-aux-Trembles?

By darkness and moon alone, Aug 1, with 4 h of moon-free darkness inside 10 PM to 2 AM at Rivière-des-Prairies-Pointe-aux-Trembles. Activity on that date will only be known hours ahead.

Rivière-des-Prairies-Pointe-aux-Trembles · August 2027

Northern lights in Rivière-des-Prairies-Pointe-aux-Trembles in August 2027

Answer

August gives Rivière-des-Prairies-Pointe-aux-Trembles 8.7 hours of civil night on the 15th, the 9th darkest of its 12 months, under 57% mean cloud. 3% of August days since 1996 reached Kp 6, enough for the oval edge to reach Rivière-des-Prairies-Pointe-aux-Trembles.

8.8 h

civil night, average night

SunCalc for 45.64, -73.58; NASA POWER; GFZ Kp

August against the rest of the year

4.2

4.0

3.8

3.1

2.7

2.6

3.1

3.7

4.8

3.8

3.4

August cloud at Rivière-des-Prairies-Pointe-aux-Trembles averages 57% in NASA POWER's 2001 to 2020 record, 8 points clearer than its yearly mean. September is Rivière-des-Prairies-Pointe-aux-Trembles's clearest month at 54%. By civil night times clear sky, August scores 3.7 hours at Rivière-des-Prairies-Pointe-aux-Trembles, 7th of 12. Trois-Rivières, 112 km away, averages 59%, cloudier by 2 points.

Civil night at Rivière-des-Prairies-Pointe-aux-Trembles starts August at 8 h 1 min and reaches 9 h 34 min by August 31 as the nights lengthen by 1.6 hours. SWPC's 10 PM to 2 AM window is fully dark on every night. True astronomical darkness, the sun 18 degrees down, lasts 5.9 hours on the 15th.

August night by night

August opens toward a new moon on Aug 2 and Aug 31, with full moon on Aug 17, in America/Toronto dates. Rivière-des-Prairies-Pointe-aux-Trembles gets 137 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: Aug 1 (4 h), Aug 2 (4 h), Aug 3 (4 h).

1
0% lit
8.0 h
2
1% lit
8.1 h
New
3
5% lit
8.1 h
4
11% lit
7.8 h
5
19% lit
7.5 h
6
29% lit
7.1 h
7
39% lit
6.8 h
8
50% lit
6.3 h
9
60% lit
5.8 h
10
69% lit
5.1 h
11
78% lit
4.3 h
12
85% lit
3.4 h
13
91% lit
2.4 h
14
96% lit
1.4 h
15
99% lit
0.3 h
16
100% lit
0.0 h
17
99% lit
0.0 h
Full
18
97% lit
0.0 h
19
93% lit
0.1 h
20
87% lit
0.4 h
21
79% lit
0.8 h
22
70% lit
1.2 h
23
60% lit
1.7 h
24
49% lit
2.4 h
25
38% lit
3.2 h
26
28% lit
4.3 h
27
18% lit
5.6 h
28
10% lit
7.0 h
29
4% lit
8.4 h
30
1% lit
9.5 h
31
0% lit
9.6 h
New

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 Augusts

Rivière-des-Prairies-Pointe-aux-Trembles needs Kp 6 for the average oval edge to sit overhead. 28 of the 930 August days from 1996 to 2025 (3%) reached it in the GFZ Potsdam record, 8th of 12 months; storm days with Kp 5 or more made up 11%. Rivière-des-Prairies-Pointe-aux-Trembles sits at 54.9 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.

August across Canada

No month-page town in Canada has more civil night on August 15 than Rivière-des-Prairies-Pointe-aux-Trembles; the national median is 8.2 hours. Coming from July (7.3 hours at Rivière-des-Prairies-Pointe-aux-Trembles), August adds darkness, and the nights keep growing into September (10.4 hours on the 15th).

Civil night on August 15 and August cloud, month-page towns in Canada
Town	Civil night	Cloud
Rivière-des-Prairies-Pointe-aux-Trembles	8.7 h	57%
Trois-Rivières	8.7 h	59%
Sydney	8.7 h	65%
Québec	8.6 h	60%
Greater Sudbury	8.6 h	56%
St. John's	8.5 h	72%
Saguenay	8.4 h	68%
Thunder Bay	8.4 h	64%
Winnipeg	8.3 h	52%
Kelowna	8.3 h	45%
Lethbridge	8.3 h	51%
Regina	8.2 h	53%

Darkness and moon, every night

Rivière-des-Prairies-Pointe-aux-Trembles, August 2027: each night from local noon to the next noon
Night	Civil	Astronomical	Moon-free dark	Moon-free, 10 PM to 2 AM	Moon lit
Sun Aug 1	8 h 1 min	4 h 51 min	8 h 1 min	4 h	0%
Mon Aug 2	8 h 4 min	4 h 56 min	8 h 4 min	4 h	1%
Tue Aug 3	8 h 7 min	5 h	8 h 7 min	4 h	5%
Wed Aug 4	8 h 9 min	5 h 4 min	7 h 47 min	4 h	11%
Thu Aug 5	8 h 12 min	5 h 9 min	7 h 27 min	4 h	19%
Fri Aug 6	8 h 15 min	5 h 13 min	7 h 7 min	3 h 59 min	29%
Sat Aug 7	8 h 18 min	5 h 18 min	6 h 45 min	3 h 36 min	39%
Sun Aug 8	8 h 21 min	5 h 22 min	6 h 19 min	3 h 8 min	50%
Mon Aug 9	8 h 24 min	5 h 26 min	5 h 48 min	2 h 35 min	60%
Tue Aug 10	8 h 27 min	5 h 31 min	5 h 8 min	1 h 55 min	69%
Wed Aug 11	8 h 30 min	5 h 35 min	4 h 21 min	1 h 6 min	78%
Thu Aug 12	8 h 33 min	5 h 40 min	3 h 25 min	9 min	85%
Fri Aug 13	8 h 36 min	5 h 44 min	2 h 24 min	0 min	91%
Sat Aug 14	8 h 39 min	5 h 48 min	1 h 21 min	0 min	96%
Sun Aug 15	8 h 42 min	5 h 53 min	16 min	0 min	99%
Mon Aug 16	8 h 46 min	5 h 57 min	0 min	0 min	100%
Tue Aug 17	8 h 49 min	6 h 1 min	0 min	0 min	99%
Wed Aug 18	8 h 52 min	6 h 6 min	0 min	0 min	97%
Thu Aug 19	8 h 55 min	6 h 10 min	7 min	0 min	93%
Fri Aug 20	8 h 58 min	6 h 14 min	26 min	0 min	87%
Sat Aug 21	9 h 1 min	6 h 18 min	48 min	0 min	79%
Sun Aug 22	9 h 5 min	6 h 23 min	1 h 13 min	0 min	70%
Mon Aug 23	9 h 8 min	6 h 27 min	1 h 43 min	7 min	60%
Tue Aug 24	9 h 11 min	6 h 31 min	2 h 22 min	44 min	49%
Wed Aug 25	9 h 14 min	6 h 35 min	3 h 14 min	1 h 33 min	38%
Thu Aug 26	9 h 17 min	6 h 39 min	4 h 18 min	2 h 36 min	28%
Fri Aug 27	9 h 21 min	6 h 44 min	5 h 35 min	3 h 51 min	18%
Sat Aug 28	9 h 24 min	6 h 48 min	7 h	4 h	10%
Sun Aug 29	9 h 27 min	6 h 52 min	8 h 27 min	4 h	4%
Mon Aug 30	9 h 30 min	6 h 56 min	9 h 30 min	4 h	1%
Tue Aug 31	9 h 34 min	7 h	9 h 34 min	4 h	0%

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

Questions

Can you see the northern lights in Rivière-des-Prairies-Pointe-aux-Trembles in August?: On dark, clear nights with enough activity. 31 of 31 nights at Rivière-des-Prairies-Pointe-aux-Trembles have civil darkness, and 3% of past August days reached Kp 6.
How dark is Rivière-des-Prairies-Pointe-aux-Trembles in August?: Rivière-des-Prairies-Pointe-aux-Trembles averages 8.8 hours of civil night a night in August 2027, from 8 h 1 min on the 1st to 9 h 34 min on the last night.
How cloudy is Rivière-des-Prairies-Pointe-aux-Trembles in August?: NASA POWER's 2001 to 2020 climatology gives Rivière-des-Prairies-Pointe-aux-Trembles's 1 degree cell 57% mean cloud in August, against 65% for the whole year. It is an all-hours average, not a forecast.
What is the best night in August 2027 for aurora in Rivière-des-Prairies-Pointe-aux-Trembles?: By darkness and moon alone, Aug 1, with 4 h of moon-free darkness inside 10 PM to 2 AM at Rivière-des-Prairies-Pointe-aux-Trembles. Activity on that date will only be known hours ahead.
Is August or September better in Rivière-des-Prairies-Pointe-aux-Trembles?: By civil night times the clear share, August scores 3.7 hours at Rivière-des-Prairies-Pointe-aux-Trembles and September 4.8. September comes out ahead.

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.