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La Barca

20.290° N   102.542° W  ·  1558 M
41 /100
PEAK
Marginal, but there is a 1 hour gap from 21:00.
BEST WINDOW 21:00–22:00 · ASTRO DARK 21:00–06:00 · MOON 1%
Transparency
0.21
Seeing
1.00
Cloud
65%
Moon
1%

Fair tonight

Hour by hour, local to La Barca. 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
10
41
22
20
18
14
14
14
15
17
0
0
BEST WINDOW
Low cloud
0%
3%
4%
28%
29%
29%
37%
39%
43%
45%
52%
100%
99%
Mid cloud
38%
1%
0%
0%
8%
8%
19%
5%
1%
4%
9%
3%
0%
High cloud
66%
82%
67%
66%
62%
77%
80%
86%
87%
70%
21%
23%
9%
Transparency
0.10
0.10
0.21
0.18
0.18
0.17
0.16
0.17
0.17
0.18
0.18
0.16
0.17
Seeing
1.00
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
−58
Transparency
−15
Seeing
−0
Moonlight
−0
Darkness
−27
Score
0
CLOUD 75% LOW 0% MID 38% HIGH 66% SUN 4.1° MOON 8.8° / 0% WIND 2 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 21:00–22:00 · 1H · MEAN 39

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

19212301030507
ASTRONOMICAL DARK FROM 21:00
SET UP 20:30 · OBSERVE 21:00–22:00 · 1H · MEAN 50

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 65%
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 65%
SET UP 20:30 · OBSERVE 21:00–22:00 · 1H · MEAN 37

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

19212301030507
ASTRONOMICAL DARK FROM 21:00
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The next week of nights

Tonight · 12 Aug
41
Fair
MOON 0%
21:00–22:00
Tomorrow · 13 Aug
33
Poor
MOON 3%
Friday · 14 Aug
42
Fair
MOON 7%
23:00–00:00
Saturday · 15 Aug
13
Clouded out
MOON 15%
Sunday · 16 Aug
36
Fair
MOON 23%
00:00–01:00
Monday · 17 Aug
35
Fair
MOON 32%
00:00–01:00
Tuesday · 18 Aug
41
Fair
MOON 42%
00:00–01:00
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Nearby locations

About this forecast

Conditions for La Barca, 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 →