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Lo Prado

-33.444° S   70.725° W  ·  509 M
76 /100
PEAK
A genuinely good night — 11 hours of clear, dark sky from 20:00.
BEST WINDOW 20:00–07:00 · ASTRO DARK 20:00–06:00 · MOON 0%
Transparency
0.60
Seeing
1.00
Cloud
0%
Moon
0%

Excellent tonight

Hour by hour, local to Lo Prado. 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
07
0
28
71
61
42
51
56
74
76
75
57
43
39
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
2%
1%
0%
0%
0%
0%
2%
0%
0%
0%
0%
0%
0%
0%
High cloud
0%
0%
2%
25%
74%
53%
41%
2%
0%
9%
54%
87%
98%
98%
Transparency
0.44
0.34
0.29
0.26
0.28
0.31
0.34
0.36
0.40
0.46
0.52
0.56
0.60
0.63
Seeing
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
Moon clear
0%
down
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
−1
Transparency
−22
Seeing
−0
Moonlight
−0
Darkness
−76
Score
0
CLOUD 2% LOW 0% MID 2% HIGH 0% SUN 1.5° MOON 4.8° / 0% WIND 2 TEMP 12°
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 19:30 · OBSERVE 20:00–07:00 · 11H · MEAN 57

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

18202200020406
ASTRONOMICAL DARK FROM 20:00TWILIGHT BEGINS 07:00
SET UP 18:30 · OBSERVE 19:00–07:00 · 12H · MEAN 68

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

18202200020406
TWILIGHT BEGINS 07:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 22:30 · OBSERVE 23:00–05:00 · 6H · MEAN 57

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

18202200020406
HIGH CLOUD CLEARS 23:00CLOUD RETURNS 05:00
SET UP 23:30 · OBSERVE 00:00–05:00 · 5H · MEAN 52

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

18202200020406
CLOUD RETURNS 05:00
SET UP 19:30 · OBSERVE 20:00–06:00 · 10H · MEAN 60

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

18202200020406
ASTRONOMICAL DARK FROM 20:00
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The next week of nights

Tonight · 12 Aug
76
Excellent
MOON 0%
20:00–07:00
Tomorrow · 13 Aug
58
Good
MOON 3%
22:00–02:00
Friday · 14 Aug
40
Fair
MOON 7%
21:00–22:00
Saturday · 15 Aug
32
Poor
MOON 15%
Sunday · 16 Aug
0
Clouded out
MOON 23%
Monday · 17 Aug
42
Fair
MOON 32%
02:00–03:00
Tuesday · 18 Aug
71
Good
MOON 42%
02:00–03:00
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Nearby locations

About this forecast

Conditions for Lo Prado, Chile 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 →