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Coyula

20.661° N   103.228° W  ·  1548 M
35 /100
PEAK
Marginal, but there is a 2 hours gap from 21:00.
BEST WINDOW 21:00–23:00 · ASTRO DARK 21:00–06:00 · MOON 1%
Transparency
0.25
Seeing
1.00
Cloud
66%
Moon
1%

Fair tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
19
20
21
22
23
00
01
02
03
04
05
06
07
0
7
35
35
32
35
2
1
0
1
12
0
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
80%
84%
92%
84%
60%
100%
99%
Mid cloud
7%
6%
0%
0%
0%
0%
0%
1%
1%
1%
0%
1%
0%
High cloud
98%
98%
91%
90%
98%
89%
81%
88%
83%
49%
12%
7%
1%
Transparency
0.10
0.25
0.24
0.23
0.24
0.19
0.16
0.16
0.16
0.17
0.17
0.16
0.15
Seeing
0.89
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
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
19 Clouded out · 0/100
Starting from
100
Cloud
−57
Transparency
−15
Seeing
−1
Moonlight
−0
Darkness
−27
Score
0
CLOUD 98% LOW 0% MID 7% HIGH 98% SUN 4.8° MOON 9.5° / 0% WIND 3 TEMP 21°
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.

NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

19212301030507
CLOUD NEVER DROPS BELOW 66%
SET UP 20:30 · OBSERVE 21:00–01:00 · 4H · MEAN 40

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

19212301030507
ASTRONOMICAL DARK FROM 21:00MOONLIGHT IGNORED FOR THIS TARGET
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

19212301030507
CLOUD NEVER DROPS BELOW 66%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

19212301030507
CLOUD NEVER DROPS BELOW 66%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

19212301030507
CLOUD NEVER DROPS BELOW 66%
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The next week of nights

Tonight · 12 Aug
35
Fair
MOON 0%
21:00–23:00
Tomorrow · 13 Aug
62
Good
MOON 3%
00:00–04:00
Friday · 14 Aug
47
Fair
MOON 7%
21:00–01:00
Saturday · 15 Aug
37
Fair
MOON 15%
00:00–01:00
Sunday · 16 Aug
33
Poor
MOON 23%
Monday · 17 Aug
45
Fair
MOON 32%
00:00–01:00
Tuesday · 18 Aug
38
Fair
MOON 42%
00:00–01:00
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Nearby locations

About this forecast

Conditions for Coyula, 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 →