Clear Outside v1.0 - International Weather Forecasts For Astronomers

Sunday 31

Full Moon 100%

21:54

04:17

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
19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad

Sun - Rise: 04:57, Set: 21:02, Transit: 12:59. Moon - Rise: 21:54, Set: 04:17. Civil Dark: 21:44 - 04:14. Nautical Dark: 22:45 - 03:13. Astro Dark: N/A - N/A

Total Clouds (% Sky Obscured)

62
72
61
70
99
60
94
50
54
53
100
97
95
100
100
100
100
100
100
100
100
96
100
100

Low Clouds (% Sky Obscured)

0
0
0
0
3
0
0
0
0
23
22
14
34
23
54
53
54
2
13
35
35
42
58
57

Medium Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
2
2
29
76
90
94
80
74
95
82
100
100
100
90
88
73

High Clouds (% Sky Obscured)

62
53
61
70
98
60
91
36
39
44
100
41
12
100
100
100
100
100
100
100
100
91
100
100

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
4
9
9
9
5
8
9
5
7
8

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

Precipitation Probability (%)

0
0
0
0
0
0
0
0
0
0
2
0
22
70
54
30
71
76
95
65
89
83
75
86

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0.4
0
0
0.2
0.3
0.5
0
0.3
0.2
0.2
0.4

Wind Speed/Direction (mph)

3
3
3
4
3
3
3
4
5
5
6
6
5
9
9
6
6
5
5
7
3
4
2
2

Chance of Frost

Temperature (°C)

16
15
13
13
12
12
14
17
19
21
23
24
25
25
24
24
24
22
21
19
18
17
17
17

Feels Like (°C)

15
14
14
12
11
12
14
17
20
22
23
23
24
24
23
25
25
22
21
19
19
18
18
17

Dew Point (°C)

13
13
12
11
11
11
11
13
13
13
13
13
14
14
22
22
20
17
16
17
17
16
16
16

Relative Humidity (%)

85
87
89
89
90
89
80
73
67
60
54
51
49
50
87
89
79
74
76
84
90
92
92
93

Pressure (mb)

1017
1017
1016
1016
1016
1016
1015
1015
1015
1014
1014
1013
1012
1012
1012
1011
1011
1011
1011
1011
1011
1011
1011
1011

Ozone (du)

342
341
340
340
342
344
344
343
342
341
341
340
342
344
348
345
344
345
344
344
344
343
343
343

Monday 1

Waning Gibbous 100%

22:49

04:56

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
19 Bad
20 OK
21 OK
22 OK
23 Bad
00 Bad

Sun - Rise: 04:56, Set: 21:03, Transit: 12:59. Moon - Rise: 22:49, Set: 04:56. Civil Dark: 21:46 - 04:13. Nautical Dark: 22:47 - 03:12. Astro Dark: N/A - N/A

Total Clouds (% Sky Obscured)

100
100
100
100
100
100
100
100
100
100
98
99
100
97
90
87
44
26
33
45
19
37
51
64

Low Clouds (% Sky Obscured)

57
65
59
65
61
79
92
76
78
77
74
62
76
68
23
36
32
26
17
7
0
1
2
2

Medium Clouds (% Sky Obscured)

71
96
97
99
97
100
97
97
100
97
91
95
93
88
66
36
33
0
1
14
17
32
45
56

High Clouds (% Sky Obscured)

100
100
100
100
98
4
71
26
9
5
70
70
92
70
52
69
6
4
12
19
0
8
11
19

ISS Passover

Visibility (miles)

3
5
7
3
4
4
9
3
5
9
4
9
9
9
9
6
8
5
8
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

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

Precipitation Probability (%)

95
86
86
95
95
95
95
95
95
90
83
35
47
43
56
72
59
48
36
1
0
0
0
0

Precipitation Amount (mm)

0.7
0.4
0.3
0.4
0.4
0.3
1.2
1.8
0.8
0.6
0.6
0
0
0
0
0.5
0.3
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

2
3
4
5
5
5
5
9
12
10
12
9
10
9
6
7
8
7
5
4
3
2
2
2

Chance of Frost

Temperature (°C)

16
16
16
16
16
16
16
16
15
15
16
16
17
17
17
19
20
20
19
18
16
16
15
14

Feels Like (°C)

17
17
17
16
16
16
16
14
13
13
13
15
16
15
17
19
18
20
21
20
18
18
17
16

Dew Point (°C)

16
15
16
15
15
15
14
14
14
14
14
15
14
14
14
12
13
14
15
15
13
13
13
12

Relative Humidity (%)

96
96
98
98
98
96
90
90
90
93
90
93
81
83
78
63
67
68
75
80
82
85
86
87

Pressure (mb)

1011
1011
1011
1011
1011
1011
1012
1012
1013
1014
1014
1015
1015
1015
1015
1015
1015
1014
1014
1015
1015
1015
1015
1015

Ozone (du)

342
344
347
355
359
361
362
362
361
360
360
359
358
358
358
361
365
370
368
364
364
361
359
359

Tuesday 2

Waning Gibbous 97%

23:33

05:46

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
19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad

Sun - Rise: 04:55, Set: 21:04, Transit: 13:00. Moon - Rise: 23:33, Set: 05:46. Civil Dark: 21:47 - 04:12. Nautical Dark: 22:49 - 03:10. Astro Dark: N/A - N/A

Total Clouds (% Sky Obscured)

65
63
94
97
97
87
88
88
77
72
76
89
97
100
97
100
85
96
100
100
83
96
100
100

Low Clouds (% Sky Obscured)

1
0
19
6
0
0
0
0
0
0
14
28
55
49
45
23
1
0
0
0
0
0
1
21

Medium Clouds (% Sky Obscured)

61
43
57
43
32
35
22
48
72
35
35
59
82
80
78
33
21
40
42
29
27
32
41
70

High Clouds (% Sky Obscured)

31
48
83
94
94
80
78
75
13
47
52
60
82
100
77
100
82
94
100
100
83
96
100
100

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

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
1
1
1
2
2
2
4
4
5
6
5
5
5
6
7
6
6
6
5
5
5
4
5

Chance of Frost

Temperature (°C)

13
13
13
13
12
13
14
16
18
20
22
23
24
24
25
25
25
25
24
22
21
19
18
17

Feels Like (°C)

15
15
14
13
12
13
15
16
18
20
22
23
24
24
23
24
24
24
24
22
20
19
18
16

Dew Point (°C)

12
12
11
11
11
12
12
14
14
14
14
14
13
13
13
13
14
15
17
16
15
15
14
14

Relative Humidity (%)

89
89
89
89
90
92
87
83
75
68
61
55
50
48
47
47
48
53
63
68
70
76
81
83

Pressure (mb)

1015
1015
1015
1015
1014
1014
1014
1014
1014
1013
1013
1012
1011
1011
1010
1009
1009
1008
1008
1008
1008
1008
1007
1007

Ozone (du)

358
356
353
352
352
351
349
348
346
344
344
343
343
343
343
343
343
342
342
344
347
348
348
350

Wednesday 3

Waning Gibbous 94%

00:06

06:48

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
19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad

Sun - Rise: 04:55, Set: 21:05, Transit: 13:00. Moon - Rise: 00:06, Set: 06:48. Civil Dark: 21:48 - 04:11. Nautical Dark: 22:50 - 03:09. Astro Dark: N/A - N/A

Total Clouds (% Sky Obscured)

100
98
98
97
98
99
100
100
100
100
100
100
100
100
100
100
99
98
97
98
99
100
100
95

Low Clouds (% Sky Obscured)

9
0
0
7
7
35
40
56
72
90
87
86
83
72
64
55
46
27
15
22
24
34
35
21

Medium Clouds (% Sky Obscured)

61
66
93
93
80
59
100
100
100
100
100
100
100
100
99
99
96
90
88
79
65
54
55
45

High Clouds (% Sky Obscured)

100
87
75
55
76
90
100
100
98
100
99
100
100
100
99
99
91
83
68
75
90
100
100
95

ISS Passover

Visibility (miles)

9
9
9
9
9
9
8
7
6
4
8
8
6
7
8
8
7
7
8
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
Very Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Very Light Rain
None
None
None
None
None
None
None

Precipitation Probability (%)

1
3
5
3
15
36
60
82
95
95
95
95
95
95
95
95
70
52
29
24
10
3
1
0

Precipitation Amount (mm)

0
0
0
0
0
0
0.3
0.4
0.8
0.6
0.8
1.1
1.8
1.2
1.1
0.6
0.2
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

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

Chance of Frost

Temperature (°C)

17
16
15
15
15
15
16
16
16
16
16
16
16
17
17
18
17
18
18
17
16
15
14
14

Feels Like (°C)

16
15
14
13
14
14
15
14
14
14
15
15
16
16
17
17
17
18
18
18
15
13
12
12

Dew Point (°C)

14
13
14
13
13
14
14
15
15
14
15
14
13
12
13
12
13
13
12
13
12
11
11
11

Relative Humidity (%)

82
85
89
90
90
90
87
92
93
90
92
87
79
75
74
68
77
73
69
76
78
80
80
83

Pressure (mb)

1007
1007
1007
1007
1007
1007
1007
1008
1008
1009
1009
1009
1009
1010
1010
1010
1010
1010
1010
1011
1011
1011
1011
1011

Ozone (du)

353
355
356
358
360
362
363
363
364
362
362
362
361
362
363
363
364
364
367
371
374
377
382
387

Thursday 4

Waning Gibbous 88%

00:31

07:57

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
19 Bad
20 Bad
21 Bad
22 Bad
23 Bad
00 Bad

Sun - Rise: 04:54, Set: 21:06, Transit: 13:00. Moon - Rise: 00:31, Set: 07:57. Civil Dark: 21:49 - 04:11. Nautical Dark: 22:52 - 03:08. Astro Dark: N/A - N/A

Total Clouds (% Sky Obscured)

84
75
70
65
63
68
58
58
100
100
90
80
69
65
65
61
68
70
72
81
89
98
97
96

Low Clouds (% Sky Obscured)

6
0
0
0
0
0
0
9
18
27
33
63
56
49
50
46
40
31
21
14
7
1
1
0

Medium Clouds (% Sky Obscured)

38
25
16
7
5
4
0
4
9
55
53
53
59
44
40
46
57
65
69
74
79
84
68
51

High Clouds (% Sky Obscured)

84
75
70
65
63
68
58
58
100
100
75
25
15
27
42
50
36
28
20
41
63
87
90
95

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
2
4
6
21
25
25
24
22
20
18
13
2
2
1

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)

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

Chance of Frost

Temperature (°C)

13
12
12
12
11
12
14
15
17
19
20
21
20
19
19
20
20
19
18
18
17
17
16
15

Feels Like (°C)

11
11
12
12
12
12
13
15
17
17
18
17
17
17
16
17
17
17
17
17
15
15
15
15

Dew Point (°C)

11
10
10
10
10
11
11
11
11
10
10
11
12
13
13
13
13
13
13
13
12
13
12
12

Relative Humidity (%)

86
87
89
90
92
90
83
74
65
56
50
53
61
68
66
65
64
67
71
73
73
76
75
80

Pressure (mb)

1012
1012
1012
1011
1011
1011
1011
1011
1011
1010
1010
1010
1010
1010
1009
1009
1009
1009
1009
1009
1009
1010
1010
1010

Ozone (du)

397
401
376
369
367
366
365
365
365
364
367
369
372
374
375
375
376
373
369
366
364
361
359
354

Friday 5

Waning Gibbous 81%

00:50

09:09

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 OK
18 OK
19 OK
20 OK
21 OK
22 OK
23 Bad
00 Bad

Sun - Rise: 04:54, Set: 21:06, Transit: 13:00. Moon - Rise: 00:50, Set: 09:09. Civil Dark: 21:50 - 04:10. Nautical Dark: 22:53 - 03:07. Astro Dark: N/A - N/A

Total Clouds (% Sky Obscured)

96
95
89
85
81
80
82
86
89
93
80
69
58
57
56
52
43
34
26
23
27
28
47
66

Low Clouds (% Sky Obscured)

0
5
8
14
19
21
25
37
44
48
46
45
44
39
35
30
27
23
22
22
20
18
23
29

Medium Clouds (% Sky Obscured)

27
33
39
49
52
61
67
67
66
66
61
57
55
42
28
12
11
9
8
11
11
11
29
48

High Clouds (% Sky Obscured)

96
88
78
70
49
26
4
5
6
7
6
4
3
2
2
4
2
1
0
1
2
3
16
41

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
7

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
11
19
27
29
30
32
28
23
7
8
5
0
0
0
0
0
0
0
0
0
0
15
22

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)

4
4
5
5
5
5
5
5
5
5
6
6
7
8
9
9
9
8
8
7
6
6
5
2

Chance of Frost

Temperature (°C)

14
13
13
13
13
14
15
16
18
19
20
21
22
23
24
24
25
24
23
22
21
19
17
17

Feels Like (°C)

14
14
11
11
12
12
11
10
17
17
17
17
18
18
23
23
23
23
24
24
22
22
22
21

Dew Point (°C)

12
12
12
12
11
11
11
12
11
11
11
11
12
12
12
12
13
14
15
16
16
15
15
14

Relative Humidity (%)

86
93
92
93
92
84
78
73
66
62
57
54
52
49
47
47
45
51
58
67
73
78
85
83

Pressure (mb)

1010
1010
1011
1011
1011
1012
1012
1012
1012
1012
1012
1012
1012
1012
1011
1011
1011
1010
1010
1010
1011
1011
1011
1012

Ozone (du)

350
345
341
337
333
331
329
327
327
327
327
325
324
323
324
324
324
324
324
324
325
325
326
325

Saturday 6

Waning Gibbous 72%

01:06

10:22

Sun - Rise: 04:53, Set: 21:07, Transit: 13:00. Moon - Rise: 01:06, Set: 10:22. Civil Dark: 21:51 - 04:09. Nautical Dark: 22:54 - 03:06. Astro Dark: N/A - N/A

Total Clouds (% Sky Obscured)

Low Clouds (% Sky Obscured)

Medium Clouds (% Sky Obscured)

High Clouds (% Sky Obscured)

ISS Passover

Visibility (miles)

Fog (%)

Precipitation Type

Precipitation Probability (%)

Precipitation Amount (mm)

Wind Speed/Direction (mph)

Chance of Frost

Temperature (°C)

Feels Like (°C)

Dew Point (°C)

Relative Humidity (%)

Pressure (mb)

Ozone (du)

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

Generated: 31/05/26 01:27:04. Forecast: 31/05/26 to 06/06/26. Timezone: UTC+2.00