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San Bernardino Tlaxcalancingo

19.029° N   98.277° W  ·  2138 M
70 /100
PEAK
Worth setting up — 9 hours of workable sky from 21:00.
BEST WINDOW 21:00–06:00 · ASTRO DARK 21:00–05:00 · MOON 1%
Transparency
0.59
Seeing
1.00
Cloud
2%
Moon
1%

Good tonight

Hour by hour, local to San Bernardino Tlaxcalancingo. 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
21
48
58
42
61
51
57
70
66
66
0
BEST WINDOW
Low cloud
4%
4%
0%
0%
13%
16%
14%
14%
4%
3%
2%
4%
Mid cloud
66%
48%
44%
28%
40%
2%
23%
12%
0%
7%
0%
0%
High cloud
16%
20%
9%
10%
12%
12%
1%
0%
0%
0%
0%
0%
Transparency
0.45
0.27
0.59
0.55
0.49
0.45
0.39
0.35
0.33
0.32
0.30
0.26
Seeing
0.85
0.84
0.97
0.99
1.00
0.98
0.98
1.00
1.00
1.00
0.99
0.94
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
−64
Transparency
−8
Seeing
−1
Moonlight
−0
Darkness
−27
Score
0
CLOUD 71% LOW 4% MID 66% HIGH 16% SUN -0.1° MOON 4.7° / 0% WIND 4 TEMP 20°
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 57

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 20:30 · OBSERVE 21:00–06:00 · 9H · MEAN 68

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

192123010305
ASTRONOMICAL DARK FROM 21:00TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 20:30 · OBSERVE 21:00–06:00 · 9H · MEAN 54

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 23:30 · OBSERVE 00:00–06:00 · 6H · MEAN 48

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

192123010305
CLOUD BREAKS 00:00TWILIGHT BEGINS 06:00
SET UP 20:30 · OBSERVE 21:00–06:00 · 9H · MEAN 57

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
70
Good
MOON 0%
21:00–06:00
Tomorrow · 13 Aug
58
Good
MOON 3%
00:00–03:00
Friday · 14 Aug
56
Good
MOON 7%
21:00–01:00
Saturday · 15 Aug
58
Good
MOON 15%
00:00–01:00
Sunday · 16 Aug
59
Good
MOON 23%
00:00–01:00
Monday · 17 Aug
65
Good
MOON 32%
00:00–01:00
Tuesday · 18 Aug
66
Good
MOON 42%
00:00–01:00
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Nearby locations

About this forecast

Conditions for San Bernardino Tlaxcalancingo, 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 →