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Saint George's

12.053° N   61.752° W  ·  26 M
59 /100
PEAK
Worth setting up — 5 hours of workable sky from 00:00.
BEST WINDOW 00:00–05:00 · ASTRO DARK 20:00–05:00 · MOON 0%
Transparency
0.42
Seeing
0.51
Cloud
8%
Moon
0%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
18
19
20
21
22
23
00
01
02
03
04
05
06
0
6
28
27
28
26
35
55
58
57
59
40
0
BEST WINDOW
Low cloud
5%
4%
7%
5%
2%
8%
6%
7%
4%
7%
6%
7%
9%
Mid cloud
13%
5%
4%
4%
3%
7%
5%
7%
8%
7%
5%
2%
13%
High cloud
71%
84%
96%
100%
100%
98%
72%
6%
3%
2%
3%
1%
0%
Transparency
0.43
0.40
0.40
0.42
0.41
0.38
0.37
0.38
0.40
0.40
0.41
0.42
0.13
Seeing
0.43
0.45
0.47
0.44
0.48
0.47
0.46
0.47
0.51
0.50
0.49
0.45
0.44
Moon clear
0%
down
down
down
down
down
down
down
down
down
down
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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
18 Clouded out · 0/100
Starting from
100
Cloud
−49
Transparency
−12
Seeing
−6
Moonlight
−0
Darkness
−34
Score
0
CLOUD 76% LOW 5% MID 13% HIGH 71% SUN 6.0° MOON 9.7° / 0% WIND 8 TEMP 28°
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
Why thin high cloud ruins long exposures

Cirrus you can barely see will halo your bright stars, lift your background and vary between frames. Visual observers shrug it off. Long exposures integrate it, so it accumulates.

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 23:30 · OBSERVE 00:00–06:00 · 6H · MEAN 53

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

18202200020406
HIGH CLOUD CLEARS 00:00TWILIGHT BEGINS 06:00
SET UP 00:30 · OBSERVE 01:00–06:00 · 5H · MEAN 57

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

18202200020406
HIGH CLOUD CLEARS 01:00TWILIGHT BEGINS 06:00SEEING STAYS SOFT THROUGHOUT
SET UP 00:30 · OBSERVE 01:00–06:00 · 5H · MEAN 56

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

18202200020406
HIGH CLOUD CLEARS 01:00TWILIGHT BEGINS 06:00
SET UP 00:30 · OBSERVE 01:00–05:00 · 4H · MEAN 48

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

18202200020406
HIGH CLOUD CLEARS 01:00TWILIGHT BEGINS 05:00
SET UP 23:30 · OBSERVE 00:00–06:00 · 6H · MEAN 57

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

18202200020406
HIGH CLOUD CLEARS 00:00TWILIGHT BEGINS 06:00
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The next week of nights

Tonight · 12 Aug
59
Good
MOON 0%
00:00–05:00
Tomorrow · 13 Aug
53
Fair
MOON 3%
02:00–05:00
Friday · 14 Aug
53
Fair
MOON 7%
20:00–23:00
Saturday · 15 Aug
33
Poor
MOON 15%
Sunday · 16 Aug
37
Fair
MOON 23%
02:00–03:00
Monday · 17 Aug
54
Fair
MOON 32%
02:00–03:00
Tuesday · 18 Aug
56
Good
MOON 42%
02:00–03:00
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Nearby locations

About this forecast

Conditions for Saint George's, Grenada 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 →