Clear Outside v1.0 - International Weather Forecasts For Astronomers

Monday 22

Waxing Crescent 12%

10:30

18:05

15 Bad
16 Bad
17 Bad
18 Bad
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 OK
13 Bad
14 OK

Sun - Rise: 07:59, Set: 16:02, Transit: 12:01. Moon - Rise: 10:30, Set: 18:05. Civil Dark: 16:40 - 07:21. Nautical Dark: 17:22 - 06:39. Astro Dark: 18:02 - 05:59

Total Clouds (% Sky Obscured)

90
84
81
83
87
91
93
96
97
100
98
85
86
84
66
56
53
52
48
47
39
40
45
42

Low Clouds (% Sky Obscured)

82
84
81
83
87
91
93
96
97
100
98
85
86
84
66
56
53
52
48
47
39
40
45
42

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)

4
4
3
2
4
11
7
7
4
5
4
1
0
0
3
2
2
3
3
3
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
0
0
0
0
0
0
0
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
4
2
5
3
5
6
7
9
11
10
14
11
9
10
10
12
14
15
13
6
3

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
9
8
8
10
9
9
9
9
9
9
9
9
9
9
8
7
7
6
6
8
9
8
8

Chance of Frost

Temperature (°C)

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

Feels Like (°C)

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

Dew Point (°C)

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

Relative Humidity (%)

71
76
79
80
80
80
82
83
83
83
83
82
83
86
86
89
91
91
89
83
76
75
73
73

Pressure (mb)

1016
1016
1016
1016
1017
1017
1017
1017
1017
1017
1017
1017
1017
1017
1017
1017
1018
1018
1019
1019
1019
1019
1019
1019

Ozone (du)

298
301
308
318
322
324
325
328
337
341
344
347
352
355
357
359
362
363
362
365
366
366
369
372

Tuesday 23

Waxing Crescent 11%

10:48

19:21

15 OK
16 Bad
17 Bad
18 Bad
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 OK
08 OK
09 OK
10 Bad
11 Bad
12 Bad
13 OK
14 OK

Sun - Rise: 07:59, Set: 16:03, Transit: 12:01. Moon - Rise: 10:48, Set: 19:21. Civil Dark: 16:41 - 07:21. Nautical Dark: 17:23 - 06:39. Astro Dark: 18:02 - 06:00

Total Clouds (% Sky Obscured)

39
55
93
98
96
95
84
86
68
79
92
72
61
69
66
47
37
35
39
43
57
43
30
23

Low Clouds (% Sky Obscured)

39
55
93
97
96
84
79
80
68
62
50
28
31
46
56
47
37
35
39
43
53
43
30
23

Medium Clouds (% Sky Obscured)

0
17
30
62
55
53
49
43
38
33
46
41
31
30
17
7
0
0
7
6
18
2
2
2

High Clouds (% Sky Obscured)

0
0
0
0
0
0
0
1
0
0
0
0
0
0
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
9
9
9
9
9
9

Fog (%)

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 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 (%)

9
11
17
19
16
18
11
7
6
4
4
4
4
4
6
8
4
5
4
2
1
1
1
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)

8
7
7
6
6
6
5
5
4
5
5
6
6
6
7
8
9
10
10
11
14
15
16
16

Chance of Frost

Temperature (°C)

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

Feels Like (°C)

2
2
0
-1
-2
-2
-2
-1
-2
-2
-3
-4
-5
-5
-5
-5
-5
-5
-5
-5
-5
-6
-5
-5

Dew Point (°C)

1
1
1
-1
-1
-2
-2
-1
-2
-2
-2
-3
-5
-5
-5
-5
-5
-6
-7
-7
-7
-7
-7
-7

Relative Humidity (%)

77
85
86
80
79
78
80
83
84
86
86
81
75
74
72
72
72
68
65
60
57
56
57
58

Pressure (mb)

1020
1020
1021
1022
1022
1023
1023
1024
1024
1024
1025
1025
1025
1025
1026
1026
1026
1027
1028
1028
1028
1028
1028
1028

Ozone (du)

366
360
361
362
369
377
380
388
395
399
401
402
406
402
398
395
392
387
389
389
387
385
382
377

Wednesday 24

Waxing Crescent 19%

11:03

20:37

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

Sun - Rise: 08:00, Set: 16:03, Transit: 12:02. Moon - Rise: 11:03, Set: 20:37. Civil Dark: 16:42 - 07:21. Nautical Dark: 17:23 - 06:40. Astro Dark: 18:03 - 06:00

Total Clouds (% Sky Obscured)

20
19
12
14
6
6
7
7
12
56
76
68
65
63
63
56
51
44
15
9
6
4
4
4

Low Clouds (% Sky Obscured)

20
19
11
14
5
2
2
1
2
2
2
2
3
2
2
2
2
2
2
2
2
2
2
2

Medium Clouds (% Sky Obscured)

0
0
1
1
0
0
1
1
4
53
51
25
18
14
22
47
47
40
9
3
1
0
0
0

High Clouds (% Sky Obscured)

0
0
0
0
1
3
1
0
4
14
49
68
65
63
63
56
51
44
5
6
3
1
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
0
0
0
0
0
0
0
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)

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

Chance of Frost

Temperature (°C)

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

Feels Like (°C)

-6
-6
-6
-7
-8
-8
-9
-9
-9
-9
-9
-10
-10
-10
-10
-10
-9
-9
-9
-7
-6
-5
-4
-4

Dew Point (°C)

-7
-7
-8
-8
-9
-9
-9
-10
-10
-10
-10
-10
-10
-10
-10
-10
-10
-10
-10
-10
-10
-10
-9
-9

Relative Humidity (%)

59
61
61
61
59
59
59
59
59
59
59
59
59
58
58
58
59
60
59
57
53
52
51
53

Pressure (mb)

1029
1029
1030
1030
1031
1031
1031
1032
1032
1032
1032
1032
1032
1032
1032
1032
1032
1033
1033
1033
1033
1033
1032
1032

Ozone (du)

369
364
362
359
359
359
361
363
362
362
363
366
366
365
367
369
373
375
371
367
362
359
355
353

Thursday 25

Waxing Crescent 28%

11:17

21:54

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

Sun - Rise: 08:00, Set: 16:04, Transit: 12:02. Moon - Rise: 11:17, Set: 21:54. Civil Dark: 16:42 - 07:22. Nautical Dark: 17:24 - 06:40. Astro Dark: 18:04 - 06:00

Total Clouds (% Sky Obscured)

14
21
7
4
4
4
3
3
16
4
3
6
7
5
4
12
12
24
34
59
65
73
67
61

Low Clouds (% Sky Obscured)

9
14
4
2
2
2
2
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Medium Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
10
20
30
36
60
67
60
50

High Clouds (% Sky Obscured)

0
0
0
0
0
0
0
1
9
3
3
6
7
5
4
11
5
8
10
28
26
15
9
1

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
0
0
0
0
0
0
0
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)

8
7
7
6
5
5
4
4
4
3
4
3
3
2
2
2
2
1
1
1
2
2
3
3

Chance of Frost

Temperature (°C)

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

Feels Like (°C)

-4
-5
-5
-5
-5
-5
-5
-6
-6
-6
-6
-6
-6
-6
-6
-6
-7
-6
-5
-5
-6
-5
-4
-4

Dew Point (°C)

-8
-8
-7
-7
-7
-8
-8
-8
-8
-8
-8
-8
-8
-8
-9
-9
-9
-9
-9
-9
-9
-9
-8
-8

Relative Humidity (%)

56
62
67
68
71
71
72
72
73
72
72
73
73
73
73
73
73
74
72
65
62
59
58
60

Pressure (mb)

1032
1032
1032
1033
1033
1033
1033
1034
1033
1033
1033
1033
1033
1033
1033
1033
1033
1033
1033
1033
1033
1033
1032
1032

Ozone (du)

353
351
348
340
336
333
329
327
321
316
310
305
303
303
303
303
302
300
299
297
296
295
295
294

Friday 26

Waxing Crescent 38%

11:30

23:11

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

Sun - Rise: 08:00, Set: 16:05, Transit: 12:03. Moon - Rise: 11:30, Set: 23:11. Civil Dark: 16:43 - 07:22. Nautical Dark: 17:25 - 06:40. Astro Dark: 18:04 - 06:01

Total Clouds (% Sky Obscured)

48
31
29
34
36
42
48
65
74
36
30
35
42
56
66
57
39
43
46
48
51
56
48
38

Low Clouds (% Sky Obscured)

0
1
2
1
7
12
18
44
60
32
29
35
42
56
66
57
36
33
34
32
30
29
26
24

Medium Clouds (% Sky Obscured)

41
31
29
33
33
39
41
27
12
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

High Clouds (% Sky Obscured)

0
0
0
0
0
0
0
1
0
1
1
1
1
0
0
0
0
0
0
8
19
30
20
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 (%)

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

Chance of Frost

Temperature (°C)

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

Feels Like (°C)

-4
-5
-4
-5
-5
-5
-5
-5
-6
-6
-5
-4
-4
-5
-5
-4
-4
-4
-4
-4
-4
-4
-3
0

Dew Point (°C)

-7
-6
-7
-8
-9
-10
-11
-11
-12
-13
-12
-12
-12
-11
-10
-10
-9
-10
-9
-9
-8
-7
-6
-6

Relative Humidity (%)

64
71
71
67
64
59
55
51
48
44
46
48
49
51
53
55
56
54
53
52
53
53
54
58

Pressure (mb)

1032
1032
1032
1033
1033
1033
1033
1033
1033
1033
1033
1033
1033
1033
1033
1032
1032
1033
1033
1033
1032
1031
1030
1029

Ozone (du)

292
291
291
292
296
298
297
296
293
291
291
288
286
283
280
279
277
278
278
279
280
281
283
285

Saturday 27

First Quarter 49%

11:44

00:29

15 OK
16 OK
17 Good
18 OK
19 OK
20 OK
21 Bad
22 Bad
23 OK
00 OK
01 OK
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

Sun - Rise: 08:00, Set: 16:05, Transit: 12:03. Moon - Rise: 11:44, Set: 00:29. Civil Dark: 16:44 - 07:22. Nautical Dark: 17:25 - 06:40. Astro Dark: 18:05 - 06:01

Total Clouds (% Sky Obscured)

22
19
17
18
33
44
51
45
36
32
42
53
59
58
58
60
66
73
82
79
75
69
70
71

Low Clouds (% Sky Obscured)

22
18
17
17
27
29
27
23
18
16
34
51
59
58
58
60
66
73
82
79
75
69
70
68

Medium Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
0

High Clouds (% Sky Obscured)

0
1
1
2
2
2
6
6
6
12
10
5
0
0
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
9
9
9
9
9
9

Fog (%)

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 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
1
1
1
0
1
1
0
6
8
8
11
11
10
13
13
14
13
10
1
2
2

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)

5
4
5
6
8
7
8
7
8
9
10
9
8
7
7
8
9
9
10
11
11
12
13
12

Chance of Frost

Temperature (°C)

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

Feels Like (°C)

-1
-1
-1
-2
-2
-4
-5
-5
-5
-5
-5
-5
-5
-6
-6
-6
-6
-6
-6
-6
-6
-6
-6
-5

Dew Point (°C)

-5
-5
-5
-6
-6
-5
-4
-3
-4
-4
-4
-4
-4
-5
-6
-6
-6
-6
-6
-6
-6
-7
-7
-7

Relative Humidity (%)

63
67
67
67
66
72
80
87
86
84
83
81
83
81
78
76
75
74
72
71
65
61
58
60

Pressure (mb)

1028
1028
1028
1028
1028
1028
1027
1027
1027
1026
1026
1026
1026
1026
1026
1027
1027
1027
1028
1029
1029
1029
1029
1030

Ozone (du)

287
290
292
294
295
298
301
304
311
318
326
329
333
336
349
361
374
374
375
375
370
365
360
360

Sunday 28

Waxing Gibbous 61%

12:00

01:52

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

Sun - Rise: 08:00, Set: 16:06, Transit: 12:04. Moon - Rise: 12:00, Set: 01:52. Civil Dark: 16:45 - 07:22. Nautical Dark: 17:26 - 06:41. Astro Dark: 18:06 - 06:01

Total Clouds (% Sky Obscured)

65
60
58
67
64
59
52
53
53
54
51
50
49
48
45
42
31
18
3
2
2
1

Low Clouds (% Sky Obscured)

61
48
40
37
41
46
50
51
52
54
51
50
49
46
43
40
29
16
2
2
1
1

Medium Clouds (% Sky Obscured)

0
3
6
23
25
14
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

High 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

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

Fog (%)

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

Precipitation Probability (%)

1
4
5
4
9
9
6
10
9
4
6
5
2
4
3
1
1
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

Wind Speed/Direction (mph)

12
12
11
11
11
10
10
10
9
8
8
7
7
6
5
5
5
5
5
6
6
7

Chance of Frost

Temperature (°C)

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

Feels Like (°C)

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

Dew Point (°C)

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

Relative Humidity (%)

65
68
70
72
74
76
78
81
81
81
81
81
81
79
81
81
81
78
75
72
67
62

Pressure (mb)

1030
1031
1031
1031
1032
1032
1033
1033
1033
1033
1033
1033
1033
1034
1034
1034
1034
1034
1034
1034
1033
1033

Ozone (du)

360
360
356
352
347
339
331
323
320
317
314
311
308
304
304
304
304
304
303
303
303
303

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

Generated: 22/12/25 15:57:39. Forecast: 22/12/25 to 28/12/25. Timezone: UTC+1.00