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San Martin Texmelucan de Labastida

19.284° N   98.439° W  ·  2260 M
75 /100
PEAK
A genuinely good night — 9 hours of clear, dark sky from 21:00.
BEST WINDOW 21:00–06:00 · ASTRO DARK 21:00–05:00 · MOON 1%
Transparency
0.66
Seeing
1.00
Cloud
1%
Moon
1%

Excellent tonight

Hour by hour, local to San Martin Texmelucan de Labastida. 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
0
33
48
68
57
66
75
68
75
75
63
0
BEST WINDOW
Low cloud
1%
1%
20%
3%
0%
1%
0%
1%
1%
0%
0%
0%
Mid cloud
45%
36%
29%
13%
30%
16%
3%
13%
1%
1%
13%
0%
High cloud
4%
5%
2%
0%
2%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.78
0.66
0.51
0.50
0.49
0.45
0.44
0.43
0.41
0.39
0.37
0.38
Seeing
0.95
0.84
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
19 Clouded out · 0/100
Starting from
100
Cloud
−42
Transparency
−5
Seeing
−1
Moonlight
−0
Darkness
−52
Score
0
CLOUD 46% LOW 1% MID 45% HIGH 4% SUN 0.1° MOON 4.9° / 0% WIND 3 TEMP 19°
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 21:00–06:00 · 9H · MEAN 66

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

192123010305
ASTRONOMICAL DARK FROM 21:00TWILIGHT BEGINS 06:00
SET UP 19:30 · OBSERVE 20:00–06:00 · 10H · MEAN 75

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

192123010305
TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 20:30 · OBSERVE 21:00–06:00 · 9H · MEAN 63

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

192123010305
ASTRONOMICAL DARK FROM 21:00TWILIGHT BEGINS 06:00
SET UP 21:30 · OBSERVE 22:00–06:00 · 8H · MEAN 56

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

192123010305
CLOUD BREAKS 22:00TWILIGHT BEGINS 06:00
SET UP 20:30 · OBSERVE 21:00–06:00 · 9H · MEAN 67

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

192123010305
ASTRONOMICAL DARK FROM 21:00TWILIGHT BEGINS 06:00
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The next week of nights

Tonight · 12 Aug
75
Excellent
MOON 0%
21:00–06:00
Tomorrow · 13 Aug
45
Fair
MOON 3%
23:00–06:00
Friday · 14 Aug
54
Fair
MOON 7%
22:00–01:00
Saturday · 15 Aug
54
Fair
MOON 15%
00:00–01:00
Sunday · 16 Aug
62
Good
MOON 23%
00:00–01:00
Monday · 17 Aug
72
Good
MOON 32%
00:00–01:00
Tuesday · 18 Aug
43
Fair
MOON 42%
00:00–01:00
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Nearby locations

About this forecast

Conditions for San Martin Texmelucan de Labastida, 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 →