Clear Outside v1.0 - International Weather Forecasts For Astronomers

Thursday 18

Waning Crescent 1%

07:58

14:54

19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad
01 Bad
02 Bad
03 Bad
04 Bad
05 Bad
06 Bad
07 Bad
08 Bad
09 Bad
10 Bad
11 Bad
12 Bad
13 OK
14 OK
15 OK
16 OK
17 OK
18 Bad

Sun - Rise: 07:57, Set: 16:01, Transit: 11:59. Moon - Rise: 07:58, Set: 14:54. Civil Dark: 16:39 - 07:19. Nautical Dark: 17:21 - 06:37. Astro Dark: 18:00 - 05:57

Total Clouds (% Sky Obscured)

75
70
63
43
46
50
50
50
45
45
45
45
53
70
96
99
94
76
46
35
35
30
34
39

Low Clouds (% Sky Obscured)

61
60
63
43
46
50
50
50
45
45
45
45
53
70
96
99
94
76
46
35
35
30
34
39

Medium Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

High Clouds (% Sky Obscured)

3
1
4
4
1
0
0
0
0
0
0
0
6
6
2
0
0
0
0
0
0
0
0
0

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
9
16
9
5
2
1
0
0

Precipitation Type

None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

3
3
3
4
4
4
4
4
4
4
4
4
4
5
5
5
5
4
4
3
3
2
2
2

Chance of Frost

Temperature (°C)

1
1
1
2
1
1
1
1
1
1
1
1
1
1
2
2
3
3
4
4
4
3
3
3

Feels Like (°C)

0
0
1
0
0
1
0
-0
-0
0
0
0
0
0
-1
-1
0
1
3
4
4
4
3
3

Dew Point (°C)

-1
-1
-0
0
-0
-1
-1
-1
-1
-0
-0
0
0
1
1
1
0
1
1
1
2
2
2
2

Relative Humidity (%)

88
89
89
89
89
89
88
89
89
91
91
93
93
94
94
89
83
82
80
82
86
89
89
89

Pressure (mb)

1026
1026
1026
1026
1026
1026
1026
1026
1025
1025
1025
1025
1026
1026
1026
1026
1026
1025
1025
1025
1025
1025
1025
1025

Ozone (du)

311
309
306
303
300
298
295
291
290
286
286
286
284
283
282
279
274
269
262
255
258
266
277
290

Friday 19

Waning Crescent 0%

08:52

15:48

19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad
01 Bad
02 Bad
03 Bad
04 Bad
05 Bad
06 Bad
07 Bad
08 Bad
09 Bad
10 Bad
11 Bad
12 Bad
13 Bad
14 Bad
15 Bad
16 Bad
17 Bad
18 Bad

Sun - Rise: 07:58, Set: 16:01, Transit: 11:59. Moon - Rise: 08:52, Set: 15:48. Civil Dark: 16:39 - 07:19. Nautical Dark: 17:21 - 06:37. Astro Dark: 18:01 - 05:58

Total Clouds (% Sky Obscured)

43
39
42
40
73
83
99
100
100
100
100
100
100
100
100
100
80
62
64
90
87
81
87
84

Low Clouds (% Sky Obscured)

43
39
42
40
68
73
94
96
97
100
100
100
100
100
94
90
80
62
64
66
66
65
65
70

Medium Clouds (% Sky Obscured)

0
6
8
4
40
55
78
82
79
80
78
71
82
79
80
80
28
37
33
33
38
48
34
2

High Clouds (% Sky Obscured)

0
0
0
0
0
0
0
1
6
7
7
5
7
39
27
22
32
8
7
52
51
3
7
43

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

0
5
19
41
51
89
100
100
100
100
100
100
100
100
100
87
88
81
50
31
16
8
2
0

Precipitation Type

None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

0
0
0
0
1
2
0
0
1
0
0
0
2
2
0
0
0
0
0
0
0
0
0
0

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

2
2
2
3
2
2
3
3
2
2
3
3
2
2
3
2
2
3
3
4
3
3
3
3

Chance of Frost

Temperature (°C)

3
3
3
2
2
2
2
2
2
2
2
2
2
3
3
3
4
4
5
5
4
4
3
3

Feels Like (°C)

3
3
3
2
2
0
0
-1
0
-0
-1
-1
0
0
1
1
2
3
3
3
2
1
2
1

Dew Point (°C)

1
1
1
1
1
0
0
0
1
0
1
1
1
1
1
0
1
0
0
0
1
1
1
2

Relative Humidity (%)

89
89
91
89
89
88
89
88
89
88
88
88
88
86
85
80
79
73
72
73
79
85
86
89

Pressure (mb)

1025
1025
1025
1025
1024
1024
1024
1024
1023
1023
1023
1023
1023
1023
1023
1023
1022
1022
1021
1021
1021
1020
1020
1020

Ozone (du)

293
287
292
298
302
305
308
314
319
324
328
327
322
316
311
306
301
297
292
289
285
284
284
283

Saturday 20

New Moon 2%

09:34

16:53

19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad
01 Bad
02 Bad
03 Bad
04 Bad
05 Bad
06 Bad
07 Bad
08 Bad
09 Bad
10 Bad
11 Bad
12 Bad
13 Bad
14 Bad
15 Bad
16 Bad
17 Bad
18 Bad

Sun - Rise: 07:58, Set: 16:01, Transit: 12:00. Moon - Rise: 09:34, Set: 16:53. Civil Dark: 16:40 - 07:20. Nautical Dark: 17:22 - 06:38. Astro Dark: 18:01 - 05:58

Total Clouds (% Sky Obscured)

84
88
100
97
100
100
100
92
61
57
60
54
54
51
54
72
92
91
94
99
99
89
99
99

Low Clouds (% Sky Obscured)

70
70
70
71
67
62
67
62
57
55
55
54
54
51
54
64
71
73
69
67
51
52
69
88

Medium Clouds (% Sky Obscured)

2
1
1
3
30
68
43
41
43
36
34
35
43
33
33
30
25
18
27
33
50
50
42
50

High Clouds (% Sky Obscured)

43
56
85
75
84
80
78
71
13
7
12
19
4
4
6
26
54
75
71
64
50
28
20
15

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

0
0
70
88
100
100
100
100
100
100
99
97
89
89
89
89
89
89
89
89
89
89
89
89

Precipitation Type

None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

3
3
3
3
3
3
3
3
4
4
4
5
5
5
4
5
6
7
8
8
7
6
6
6

Chance of Frost

Temperature (°C)

3
3
3
3
3
3
2
2
2
2
2
2
2
2
2
2
3
4
4
4
4
4
3
3

Feels Like (°C)

2
1
1
0
-0
0
-1
-0
0
1
0
1
1
1
1
1
1
1
1
1
0
1
0
-0

Dew Point (°C)

2
1
1
1
1
1
1
1
1
1
1
0
0
1
1
1
1
1
1
1
2
2
2
2

Relative Humidity (%)

89
89
89
91
89
91
91
91
91
91
91
91
91
93
93
89
83
80
79
79
83
89
91
89

Pressure (mb)

1020
1020
1020
1020
1020
1019
1019
1019
1019
1019
1019
1019
1019
1019
1019
1019
1019
1018
1018
1017
1017
1017
1017
1017

Ozone (du)

282
281
282
282
282
281
282
283
283
283
285
287
287
286
283
283
283
282
281
280
278
277
276
277

Sunday 21

Waxing Crescent 6%

10:06

18:05

19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad
01 Bad
02 Bad
03 Bad
04 Bad
05 Bad
06 Bad
07 Bad
08 Bad
09 Bad
10 Bad
11 Bad
12 Bad
13 Bad
14 Bad
15 Bad
16 Bad
17 Bad
18 Bad

Sun - Rise: 07:59, Set: 16:02, Transit: 12:00. Moon - Rise: 10:06, Set: 18:05. Civil Dark: 16:40 - 07:20. Nautical Dark: 17:22 - 06:38. Astro Dark: 18:02 - 05:59

Total Clouds (% Sky Obscured)

99
99
99
99
92
99
98
97
96
97
98
99
99
98
97
97
97
98
97
97
97
94
92
91

Low Clouds (% Sky Obscured)

96
97
98
97
81
88
94
93
93
94
96
98
97
96
95
89
83
79
85
90
94
91
88
84

Medium Clouds (% Sky Obscured)

50
49
49
46
47
53
41
30
28
42
56
74
60
45
30
43
60
75
62
52
38
36
33
28

High Clouds (% Sky Obscured)

14
15
15
13
20
38
44
44
40
38
37
37
30
24
23
19
16
8
11
15
10
5
10
9

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89

Precipitation Type

None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
2
0
1
11
1
2
0
14

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

8
8
8
9
10
9
9
10
10
11
11
12
12
13
13
13
13
14
14
13
13
12
12
12

Chance of Frost

Temperature (°C)

4
4
4
4
4
4
4
4
4
4
4
5
5
5
5
5
6
6
6
6
6
6
5
5

Feels Like (°C)

-1
-0
-1
-1
-1
-0
-1
-2
-1
-1
-1
-1
-1
-1
-1
-1
0
1
1
1
1
1
1
0

Dew Point (°C)

1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
1
1

Relative Humidity (%)

85
85
83
77
77
83
83
83
82
79
80
79
79
79
76
75
74
72
71
72
74
74
75
75

Pressure (mb)

1017
1017
1017
1017
1017
1017
1016
1016
1016
1015
1015
1015
1015
1015
1016
1016
1016
1015
1015
1015
1016
1016
1016
1017

Ozone (du)

279
280
282
282
281
279
280
282
281
282
284
286
287
289
293
298
306
313
317
317
324
334
328
324

Monday 22

Waxing Crescent 12%

10:30

No Set

19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad
01 Bad
02 Bad
03 Bad
04 Bad
05 Bad
06 Bad
07 Bad
08 Bad
09 Bad
10 Bad
11 Bad
12 Bad
13 Bad
14 Bad
15 Bad
16 Bad
17 Bad
18 Bad

Sun - Rise: 07:59, Set: 16:03, Transit: 12:01. Moon - Rise: 10:30, Set: No Set. Civil Dark: 16:41 - 07:21. Nautical Dark: 17:23 - 06:39. Astro Dark: 18:02 - 05:59

Total Clouds (% Sky Obscured)

89
89
89
88
89
87
90
91
92
91
90
89
100
100
100
100
99
98
99
99
100
99
99
99

Low Clouds (% Sky Obscured)

81
81
79
80
80
81
82
83
82
79
72
86
97
97
96
96
95
94
94
95
95
95
95
95

Medium Clouds (% Sky Obscured)

24
24
22
18
12
7
9
11
12
9
4
0
23
29
30
30
48
43
48
53
39
30
25
25

High Clouds (% Sky Obscured)

14
15
15
15
15
15
15
15
20
25
31
51
75
75
75
80
90
95
91
82
74
50
31
17

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
8
8
8
9

Fog (%)

89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89

Precipitation Type

None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
Very Light Rain
Very Light Rain

Precipitation Probability (%)

1
1
0
0
1
0
0
0
0
0
0
0
11
12
15
15
15
14
24
29
33
38
43
49

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0.2
0.3

Wind Speed/Direction (mph)

12
11
11
10
10
9
9
9
10
9
9
8
7
7
8
9
9
10
10
10
10
9
9
8

Chance of Frost

Temperature (°C)

4
4
4
4
3
3
3
3
3
3
3
3
4
4
4
5
5
5
5
5
4
4
4
4

Feels Like (°C)

-0
-0
-1
0
0
-0
1
0
-1
-0
-0
0
1
1
1
1
1
1
1
2
2
1
1
0

Dew Point (°C)

1
1
1
1
1
0
0
0
1
1
1
1
2
2
2
3
3
2
2
2
2
3
2
2

Relative Humidity (%)

77
79
80
80
83
82
82
82
83
86
88
88
86
86
86
88
85
82
80
85
88
93
89
88

Pressure (mb)

1017
1017
1018
1018
1018
1018
1018
1018
1018
1018
1019
1019
1019
1017
1017
1017
1017
1017
1017
1017
1017
1017
1017
1017

Ozone (du)

330
341
346
355
363
370
376
381
383
384
382
382
382
382
383
383
383
383
383
383
383
383
384
384

Tuesday 23

Waxing Crescent 19%

10:48

19:21

19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad
01 Bad
02 Bad
03 Bad
04 Bad
05 Bad
06 Bad
07 Bad
08 Bad
09 Bad
10 Bad
11 Bad
12 Bad
13 Bad
14 Bad
15 Bad
16 Bad
17 Bad
18 Bad

Sun - Rise: 07:59, Set: 16:03, Transit: 12:01. Moon - Rise: 10:48, Set: 19:21. Civil Dark: 16:42 - 07:21. Nautical Dark: 17:23 - 06:39. Astro Dark: 18:03 - 06:00

Total Clouds (% Sky Obscured)

99
99
99
99
99
100
100
100
100
100
100
100
100
100
100
100
100
100
97
95
93
90
87
81

Low Clouds (% Sky Obscured)

93
92
91
92
94
95
95
94
94
94
95
95
94
92
92
89
85
82
83
84
84
77
68
59

Medium Clouds (% Sky Obscured)

44
49
60
73
84
98
99
99
100
100
99
99
99
99
100
100
100
100
88
76
64
58
51
43

High Clouds (% Sky Obscured)

4
2
4
4
5
12
14
14
8
2
2
0
0
0
0
0
0
0
8
15
20
14
9
4

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
8
5
3
0
3
6
9
9
9
9
9
9
9
9
9

Fog (%)

89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89

Precipitation Type

Snow
Snow
Snow
Snow
Snow
Snow
Snow
Snow
Snow
Snow
Snow
None
Snow
Snow
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

48
47
48
49
48
51
50
49
56
52
47
40
51
49
37
43
41
21
24
22
9
9
7
2

Precipitation Amount (mm)

0.3
0.2
0.3
0.2
0.2
0.2
0.2
0.2
0.3
0.2
0.1
0
0.2
0.2
0
0
0
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

8
8
9
9
9
9
9
9
9
9
10
11
12
13
14
14
14
15
15
15
15
15
14
13

Chance of Frost

Temperature (°C)

3
3
3
2
2
2
3
3
3
3
2
2
1
2
2
2
2
2
3
2
1
1
1
0

Feels Like (°C)

-1
0
0
0
0
0
1
-1
-2
-1
-2
-2
-1
-3
-3
-4
-3
-4
-4
-3
-4
-4
-4
-5

Dew Point (°C)

1
1
0
0
0
0
0
0
0
1
0
1
0
-1
-2
-3
-3
-4
-4
-4
-4
-4
-4
-5

Relative Humidity (%)

83
85
85
85
86
85
85
85
85
86
88
91
93
84
78
72
69
65
64
65
68
69
70
70

Pressure (mb)

1018
1018
1018
1019
1019
1019
1019
1019
1019
1019
1019
1019
1020
1020
1021
1021
1021
1021
1021
1022
1022
1022
1023
1023

Ozone (du)

384
385
386
387
387
388
388
389
390
391
392
393
394
393
393
393
392
391
391
389
386
384
384
385

Wednesday 24

Waxing Crescent 28%

11:03

20:37

19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad
01 Bad
02 Bad
03 Bad
04 Bad
05 Bad
06 Bad
07 Bad
08 Bad
09 Bad
10 Bad
11 Bad
12 Bad

Sun - Rise: 08:00, Set: 16:04, Transit: 12:02. Moon - Rise: 11:03, Set: 20:37. Civil Dark: 16:42 - 07:21. Nautical Dark: 17:24 - 06:40. Astro Dark: 18:04 - 06:00

Total Clouds (% Sky Obscured)

80
79
79
83
88
93
89
86
84
85
83
82
74
64
57
55
54
54

Low Clouds (% Sky Obscured)

61
65
69
72
75
79
75
72
70
65
59
54
49
44
39
44
48
53

Medium Clouds (% Sky Obscured)

37
30
23
33
43
53
47
41
37
36
34
37
39
44
53
48
39
32

High Clouds (% Sky Obscured)

5
6
8
6
4
2
2
1
0
0
0
0
0
0
0
0
0
0

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9

Fog (%)

89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89
89

Precipitation Type

None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

3
3
2
3
3
1
2
2
1
3
3
2
4
4
2
3
3
1

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

13
12
12
12
12
12
13
13
12
12
12
13
13
13
14
14
14
15

Chance of Frost

Temperature (°C)

-0
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-1
-0
0

Feels Like (°C)

-5
-6
-6
-6
-6
-6
-6
-7
-6
-7
-7
-7
-7
-8
-7
-7
-8
-7

Dew Point (°C)

-5
-5
-5
-5
-6
-6
-6
-6
-6
-6
-6
-6
-6
-6
-6
-6
-6
-6

Relative Humidity (%)

71
71
71
71
71
70
71
70
71
71
70
70
70
68
67
67
66
65

Pressure (mb)

1024
1024
1025
1025
1025
1025
1026
1026
1026
1026
1026
1026
1027
1027
1027
1028
1028
1027

Ozone (du)

385
384
384
384
380
377
374
373
373
372
373
373
373
374
375
376
371
365

Forecast for Letňany, Praha 18, Czech Republic (50.14,14.52)

Generated: 18/12/25 19:01:50. Forecast: 18/12/25 to 24/12/25. Timezone: UTC+1.00