GoodSeeing
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Frontera

26.928° N   101.452° W  ·  592 M
99 /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
1.00
Seeing
1.00
Cloud
0%
Moon
1%

Excellent tonight

Hour by hour, local to Frontera. 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
10
75
75
74
86
89
94
96
99
87
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
18%
20%
8%
6%
6%
3%
2%
1%
1%
0%
0%
0%
High cloud
9%
34%
23%
23%
23%
2%
0%
0%
0%
0%
0%
0%
Transparency
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
0.96
0.92
Seeing
0.81
0.61
0.68
0.63
0.56
0.58
0.63
0.79
0.87
0.95
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
−20
Transparency
−0
Seeing
−4
Moonlight
−0
Darkness
−76
Score
0
CLOUD 25% LOW 0% MID 18% HIGH 9% SUN 4.7° MOON 9.2° / 0% WIND 4 TEMP 37°
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 88

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

192123010305
CLOUD BREAKS 21:00TWILIGHT BEGINS 06:00
SET UP 20:30 · OBSERVE 21:00–06:00 · 9H · MEAN 81

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

192123010305
CLOUD BREAKS 21:00TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 20:30 · OBSERVE 21:00–06:00 · 9H · MEAN 89

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

192123010305
CLOUD BREAKS 21:00TWILIGHT BEGINS 06:00
SET UP 20:30 · OBSERVE 21:00–06:00 · 9H · MEAN 84

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

192123010305
CLOUD BREAKS 21:00TWILIGHT BEGINS 06:00
SET UP 20:30 · OBSERVE 21:00–06:00 · 9H · MEAN 89

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

192123010305
CLOUD BREAKS 21:00TWILIGHT BEGINS 06:00
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The next week of nights

Tonight · 12 Aug
99
Excellent
MOON 0%
21:00–06:00
Tomorrow · 13 Aug
87
Excellent
MOON 3%
21:00–06:00
Friday · 14 Aug
89
Excellent
MOON 7%
21:00–01:00
Saturday · 15 Aug
38
Fair
MOON 15%
00:00–01:00
Sunday · 16 Aug
46
Fair
MOON 23%
00:00–01:00
Monday · 17 Aug
99
Excellent
MOON 32%
00:00–01:00
Tuesday · 18 Aug
96
Excellent
MOON 42%
00:00–01:00
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Nearby locations

About this forecast

Conditions for Frontera, 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 →