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Ciudad de Armería

18.937° N   103.965° W  ·  79 M
56 /100
PEAK
Worth setting up — 3 hours of workable sky from 03:00.
BEST WINDOW 03:00–06:00 · ASTRO DARK 21:00–06:00 · MOON 1%
Transparency
0.51
Seeing
1.00
Cloud
14%
Moon
1%

Good tonight

Hour by hour, local to Ciudad de Armería. 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
8
36
36
34
31
31
31
56
52
46
17
0
BEST WINDOW
Low cloud
2%
1%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
5%
4%
5%
0%
2%
6%
11%
26%
17%
7%
15%
9%
9%
High cloud
95%
96%
96%
97%
98%
99%
92%
78%
14%
41%
48%
6%
2%
Transparency
0.53
0.51
0.48
0.45
0.37
0.29
0.29
0.30
0.29
0.29
0.36
0.39
0.38
Seeing
1.00
1.00
1.00
1.00
1.00
0.99
0.96
1.00
1.00
1.00
0.91
0.92
0.94
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
−55
Transparency
−9
Seeing
−0
Moonlight
−0
Darkness
−37
Score
0
CLOUD 95% LOW 2% MID 5% HIGH 95% SUN 5.0° MOON 9.9° / 0% WIND 2 TEMP 31°
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
When a clear gap is worth driving for

Ask how long the gap is relative to your setup time and your exposure length. A two-hour gap is a real session for a visual observer and close to worthless for someone doing four-minute subs on a target that needs three hours.

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 02:30 · OBSERVE 03:00–06:00 · 3H · MEAN 50

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

19212301030507
HIGH CLOUD CLEARS 03:00TWILIGHT BEGINS 06:00
SET UP 20:30 · OBSERVE 21:00–07:00 · 10H · MEAN 46

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

19212301030507
ASTRONOMICAL DARK FROM 21:00TWILIGHT BEGINS 07:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 02:30 · OBSERVE 03:00–06:00 · 3H · MEAN 43

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

19212301030507
HIGH CLOUD CLEARS 03:00TWILIGHT BEGINS 06:00
SET UP 02:30 · OBSERVE 03:00–04:00 · 1H · MEAN 39

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

19212301030507
HIGH CLOUD CLEARS 03:00CLOUD RETURNS 04:00
SET UP 02:30 · OBSERVE 03:00–06:00 · 3H · MEAN 49

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

19212301030507
HIGH CLOUD CLEARS 03:00TWILIGHT BEGINS 06:00
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The next week of nights

Tonight · 12 Aug
56
Good
MOON 0%
03:00–06:00
Tomorrow · 13 Aug
70
Good
MOON 3%
21:00–06:00
Friday · 14 Aug
43
Fair
MOON 7%
21:00–22:00
Saturday · 15 Aug
52
Fair
MOON 15%
00:00–01:00
Sunday · 16 Aug
30
Poor
MOON 23%
Monday · 17 Aug
47
Fair
MOON 32%
00:00–01:00
Tuesday · 18 Aug
49
Fair
MOON 42%
00:00–01:00
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Nearby locations

About this forecast

Conditions for Ciudad de Armería, 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 →