GoodSeeing
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Courtenay

49.687° N   124.994° W  ·  13 M
70 /100
PEAK
Worth setting up — 6 hours of workable sky from 23:00.
BEST WINDOW 23:00–05:00 · ASTRO DARK 23:00–04:00 · MOON 1%
Transparency
0.52
Seeing
0.85
Cloud
0%
Moon
1%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
21
22
23
00
01
02
03
04
05
06
0
31
70
70
70
70
70
63
23
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
1%
2%
2%
Mid cloud
2%
1%
0%
0%
0%
0%
0%
0%
0%
0%
High cloud
1%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.53
0.52
0.48
0.44
0.42
0.40
0.36
0.31
0.30
0.31
Seeing
0.56
0.48
0.54
0.58
0.65
0.68
0.75
0.81
0.85
0.86
Moon clear
0%
down
down
down
down
down
down
down
down
down
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
21 Clouded out · 0/100
Starting from
100
Cloud
−2
Transparency
−18
Seeing
−9
Moonlight
−0
Darkness
−71
Score
0
CLOUD 2% LOW 0% MID 2% HIGH 1% SUN -3.2° MOON 0.2° / 0% WIND 6 TEMP 21°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.
Tonight's limiting factor
What the GoodSeeing score actually measures

One number from 0 to 100 per hour, combining cloud, transparency, seeing, moonlight and darkness. Cloud gates everything else — no amount of steady, dark air rescues an overcast sky.

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 22:30 · OBSERVE 23:00–05:00 · 6H · MEAN 72

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

2123010305
ASTRONOMICAL DARK FROM 23:00TWILIGHT BEGINS 05:00
SET UP 21:30 · OBSERVE 22:00–06:00 · 8H · MEAN 70

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

2123010305
TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 22:30 · OBSERVE 23:00–05:00 · 6H · MEAN 70

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

2123010305
ASTRONOMICAL DARK FROM 23:00TWILIGHT BEGINS 05:00
SET UP 22:30 · OBSERVE 23:00–05:00 · 6H · MEAN 61

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

2123010305
ASTRONOMICAL DARK FROM 23:00TWILIGHT BEGINS 05:00
SET UP 22:30 · OBSERVE 23:00–05:00 · 6H · MEAN 79

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

2123010305
ASTRONOMICAL DARK FROM 23:00TWILIGHT BEGINS 05:00
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The next week of nights

Tonight · 12 Aug
70
Good
MOON 1%
23:00–05:00
Tomorrow · 13 Aug
78
Excellent
MOON 3%
23:00–05:00
Friday · 14 Aug
73
Good
MOON 7%
23:00–00:00
Saturday · 15 Aug
76
Excellent
MOON 17%
23:00–00:00
Sunday · 16 Aug
23
Poor
MOON 25%
Monday · 17 Aug
9
Clouded out
MOON 35%
Tuesday · 18 Aug
27
Poor
MOON 44%
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Nearby locations

About this forecast

Conditions for Courtenay, British Columbia, 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 →