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Saint-Eustache

45.565° N   73.906° W  ·  42 M
55 /100
PEAK
Worth setting up — 2 hours of workable sky from 00:00.
BEST WINDOW 00:00–02:00 · ASTRO DARK 23:00–04:00 · MOON 0%
Transparency
0.24
Seeing
1.00
Cloud
5%
Moon
0%

Good tonight

Hour by hour, local to Saint-Eustache. Colour encodes the score and nothing else; every other measurement is luminance.

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
20
21
22
23
00
01
02
03
04
05
06
0
16
55
34
36
50
11
0
0
0
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
2%
48%
99%
99%
99%
99%
Mid cloud
14%
1%
1%
1%
1%
2%
4%
3%
12%
22%
27%
High cloud
13%
3%
23%
89%
84%
43%
75%
89%
97%
79%
48%
Transparency
0.27
0.24
0.22
0.20
0.20
0.18
0.15
0.15
0.16
0.16
0.15
Seeing
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
0.99
Moon clear
0%
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Inspect

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Why this hour scored what it did
20 Clouded out · 0/100
Starting from
100
Cloud
−19
Transparency
−24
Seeing
−0
Moonlight
−0
Darkness
−58
Score
0
CLOUD 25% LOW 0% MID 14% HIGH 13% SUN 0.6° MOON 3.6° / 0% WIND 2 TEMP 19°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.

What are you doing tonight?

The same forecast, weighted for the target. Planetary work barely cares about moonlight; long exposures die on high cloud a visual observer would never notice.

SET UP 21:30 · OBSERVE 22:00–23:00 · 1H · MEAN 52

Darkness and moonlight dominate. Faint fuzzies need a genuinely dark sky more than they need steady air.

202200020406
ASTRONOMICAL DARK FROM 22:00CLOUD RETURNS 23:00
SET UP 20:30 · OBSERVE 21:00–02:00 · 5H · MEAN 55

Seeing is everything and moonlight is irrelevant. Bright targets punch through twilight, so darkness barely counts.

202200020406
CLOUD BREAKS 21:00CLOUD RETURNS 02:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 21:30 · OBSERVE 22:00–23:00 · 1H · MEAN 47

Tolerates soft seeing, but high cloud wrecks a wide frame and moonlight raises the background everywhere.

202200020406
ASTRONOMICAL DARK FROM 22:00CLOUD RETURNS 23:00
SET UP 21:30 · OBSERVE 22:00–23:00 · 1H · MEAN 37

Needs conditions to hold still for hours. Sustained transparency matters more than any single good hour.

202200020406
ASTRONOMICAL DARK FROM 22:00CLOUD RETURNS 23:00
SET UP 21:30 · OBSERVE 22:00–23:00 · 1H · MEAN 54

Naked eye, whole sky. Total cloud and moonlight are the only things that count.

202200020406
ASTRONOMICAL DARK FROM 22:00CLOUD RETURNS 23:00
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The next week of nights

Tonight · 12 Aug
55
Good
MOON 0%
00:00–02:00
Tomorrow · 13 Aug
72
Good
MOON 3%
22:00–05:00
Friday · 14 Aug
76
Excellent
MOON 7%
22:00–03:00
Saturday · 15 Aug
33
Poor
MOON 15%
Sunday · 16 Aug
7
Clouded out
MOON 23%
Monday · 17 Aug
73
Good
MOON 32%
02:00–03:00
Tuesday · 18 Aug
33
Poor
MOON 42%
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Nearby locations

About this forecast

Conditions for Saint-Eustache, Quebec, Canada are computed from the MET Norway forecast model for these exact coordinates, combined with sun and moon positions we calculate directly. The score weighs cloud cover by layer, atmospheric transparency, estimated seeing, moonlight and how dark the sky actually gets. Read the full method →