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Comalapa

15.660° N   92.141° W  ·  659 M
76 /100
PEAK
A genuinely good night — 7 hours of clear, dark sky from 20:00.
BEST WINDOW 20:00–03:00 · ASTRO DARK 20:00–05:00 · MOON 1%
Transparency
0.80
Seeing
1.00
Cloud
16%
Moon
1%

Excellent tonight

Hour by hour, local to Comalapa. 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
2
35
50
55
76
62
48
50
30
39
25
0
BEST WINDOW
Low cloud
0%
2%
4%
1%
1%
2%
6%
15%
20%
22%
13%
13%
13%
Mid cloud
14%
18%
25%
7%
2%
0%
0%
3%
4%
1%
4%
0%
0%
High cloud
97%
92%
79%
70%
61%
14%
34%
49%
34%
95%
77%
73%
86%
Transparency
0.91
0.80
0.77
0.68
0.63
0.61
0.57
0.54
0.54
0.55
0.56
0.58
0.58
Seeing
1.00
0.88
0.69
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
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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
−59
Transparency
−2
Seeing
−0
Moonlight
−0
Darkness
−39
Score
0
CLOUD 98% LOW 0% MID 14% HIGH 97% SUN 7.2° MOON 11.7° / 0% WIND 2 TEMP 30°
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 20:30 · OBSERVE 21:00–03:00 · 6H · MEAN 55

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

18202200020406
CLOUD RETURNS 03:00
SET UP 20:30 · OBSERVE 21:00–03:00 · 6H · MEAN 62

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

18202200020406
CLOUD RETURNS 03:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 20:30 · OBSERVE 21:00–03:00 · 6H · MEAN 48

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

18202200020406
CLOUD RETURNS 03:00
SET UP 22:30 · OBSERVE 23:00–01:00 · 2H · MEAN 53

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

18202200020406
HIGH CLOUD CLEARS 23:00CLOUD RETURNS 01:00
SET UP 20:30 · OBSERVE 21:00–03:00 · 6H · MEAN 52

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

18202200020406
CLOUD RETURNS 03:00
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The next week of nights

Tonight · 12 Aug
76
Excellent
MOON 0%
20:00–03:00
Tomorrow · 13 Aug
69
Good
MOON 3%
20:00–05:00
Friday · 14 Aug
70
Good
MOON 7%
20:00–01:00
Saturday · 15 Aug
29
Poor
MOON 15%
Sunday · 16 Aug
45
Fair
MOON 23%
00:00–01:00
Monday · 17 Aug
87
Excellent
MOON 32%
00:00–01:00
Tuesday · 18 Aug
30
Poor
MOON 42%
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Nearby locations

About this forecast

Conditions for Comalapa, Mexico 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 →