Clear Outside v1.0 - International Weather Forecasts For Astronomers

Monday 25

Waxing Gibbous 73%

14:50

02:28

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

Sun - Rise: 05:02, Set: 20:55, Transit: 12:58. Moon - Rise: 14:50, Set: 02:28. Civil Dark: 21:36 - 04:20. Nautical Dark: 22:34 - 03:22. Astro Dark: 00:05 - 01:46

Total Clouds (% Sky Obscured)

14
15
7
10
29
23
17
6
4
11
6
6
7
6
24
16
5
6
5
3
0
0
0
0

Low Clouds (% Sky Obscured)

14
0
0
0
0
0
0
0
0
9
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
0
0
0
0
0
0
0
0

High Clouds (% Sky Obscured)

14
4
6
10
18
17
12
4
4
6
6
3
4
4
24
16
4
6
5
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
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)

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

Chance of Frost

Temperature (°C)

21
20
18
17
15
15
15
16
18
20
21
22
24
25
26
26
27
27
26
26
24
20
19
17

Feels Like (°C)

22
21
19
18
17
16
17
18
19
20
21
22
23
24
26
26
27
27
28
28
26
22
20
19

Dew Point (°C)

19
19
17
16
15
14
14
14
14
13
12
12
12
12
13
13
14
14
15
17
17
15
14
13

Relative Humidity (%)

92
95
95
95
95
96
95
87
77
66
56
50
46
44
43
43
44
44
49
60
65
69
72
76

Pressure (mb)

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

Ozone (du)

309
310
310
308
307
306
306
305
305
306
307
306
306
306
307
308
308
308
306
306
307
307
309
311

Tuesday 26

Waxing Gibbous 82%

16:03

02:40

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

Sun - Rise: 05:01, Set: 20:56, Transit: 12:59. Moon - Rise: 16:03, Set: 02:40. Civil Dark: 21:38 - 04:19. Nautical Dark: 22:36 - 03:21. Astro Dark: 00:10 - 01:41

Total Clouds (% Sky Obscured)

3
3
4
4
4
4
4
4
4
3
2
4
4
4
5
2
3
4
3
7
3
2
0
1

Low 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

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
3
4
4
4
4
4
4
4
3
2
3
4
3
4
2
3
4
3
7
3
2
0
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)

4
4
4
4
3
3
3
3
4
5
6
6
6
6
6
6
6
6
6
5
4
4
3
3

Chance of Frost

Temperature (°C)

17
16
15
14
14
13
14
16
18
21
22
24
25
26
27
28
28
28
28
27
25
22
21
19

Feels Like (°C)

18
17
17
16
15
15
15
17
20
22
24
25
27
28
29
29
30
29
30
29
27
24
23
22

Dew Point (°C)

13
13
12
12
11
11
11
12
13
15
14
14
14
14
15
15
15
14
16
18
18
16
16
15

Relative Humidity (%)

79
81
83
84
84
86
83
77
72
68
60
54
50
48
45
44
43
42
48
57
65
69
74
77

Pressure (mb)

1030
1030
1030
1030
1030
1030
1030
1030
1030
1030
1030
1029
1029
1028
1027
1026
1026
1025
1024
1024
1024
1024
1024
1024

Ozone (du)

311
311
310
310
310
310
310
311
312
313
313
312
312
312
313
315
317
317
317
316
314
313
314
315

Wednesday 27

Waxing Gibbous 89%

17:14

02:53

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

Sun - Rise: 05:00, Set: 20:57, Transit: 12:59. Moon - Rise: 17:14, Set: 02:53. Civil Dark: 21:39 - 04:18. Nautical Dark: 22:38 - 03:19. Astro Dark: 00:16 - 01:35

Total Clouds (% Sky Obscured)

0
0
0
10
2
0
7
0
0
7
40
54
27
31
24
37
22
9
8
5
4
4
4
4

Low Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
0
5
11
14
18
25
16
25
13
0
0
0
0
0
0
0

Medium Clouds (% Sky Obscured)

0
0
0
10
0
0
7
0
0
0
24
0
0
0
0
0
0
0
0
0
0
0
0
0

High Clouds (% Sky Obscured)

0
0
0
0
1
0
0
0
0
0
6
23
6
7
8
7
5
5
8
4
3
3
3
2

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
1
2
0
0
0
1
0
8
22
5
2
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
6
9
10
11
13
15
16
15
14
15
14
13
10
8
6
5

Chance of Frost

Temperature (°C)

17
16
15
15
14
14
15
17
20
21
22
23
23
23
23
23
23
22
21
20
18
16
14
12

Feels Like (°C)

20
18
17
17
17
16
17
19
21
22
22
23
22
21
21
21
20
19
19
17
16
15
13
11

Dew Point (°C)

14
13
12
12
12
12
12
13
15
15
16
15
15
15
15
15
14
12
12
10
9
7
6
5

Relative Humidity (%)

79
81
83
83
84
84
84
78
72
69
68
63
59
58
62
60
56
51
54
53
56
57
58
61

Pressure (mb)

1023
1023
1023
1022
1022
1021
1021
1021
1021
1021
1022
1021
1021
1021
1021
1021
1021
1021
1021
1021
1022
1022
1023
1023

Ozone (du)

315
315
316
317
317
318
317
319
321
323
329
329
328
328
327
324
323
324
325
327
331
334
337
339

Thursday 28

Waxing Gibbous 94%

18:27

03:08

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

Sun - Rise: 04:59, Set: 20:58, Transit: 12:59. Moon - Rise: 18:27, Set: 03:08. Civil Dark: 21:41 - 04:17. Nautical Dark: 22:40 - 03:18. Astro Dark: 00:22 - 01:28

Total Clouds (% Sky Obscured)

0
0
4
10
15
11
7
3
4
4
3
6
9
13
34
57
79
57
40
39
40
40
27
31

Low Clouds (% Sky Obscured)

0
0
4
10
15
11
7
0
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
0
0
0
0
0
0
0
0

High Clouds (% Sky Obscured)

0
0
0
0
0
2
3
3
4
3
2
5
8
12
31
53
73
56
40
26
27
28
21
29

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)

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

Chance of Frost

Temperature (°C)

11
10
9
8
8
7
9
11
13
14
16
17
18
19
21
21
21
21
20
19
17
15
13
11

Feels Like (°C)

11
10
9
8
8
7
9
11
13
14
15
17
18
19
20
20
19
18
18
17
15
13
11
10

Dew Point (°C)

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

Relative Humidity (%)

65
69
72
74
77
78
78
71
64
58
54
50
46
44
40
36
33
35
44
51
60
60
63
66

Pressure (mb)

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

Ozone (du)

339
336
336
336
336
336
335
335
335
333
333
333
334
334
333
332
332
332
333
334
335
336
337
338

Friday 29

Waxing Gibbous 98%

19:39

03:25

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

Sun - Rise: 04:58, Set: 20:59, Transit: 12:59. Moon - Rise: 19:39, Set: 03:25. Civil Dark: 21:42 - 04:16. Nautical Dark: 22:42 - 03:16. Astro Dark: 00:29 - 01:19

Total Clouds (% Sky Obscured)

40
62
51
26
5
5
3
4
20
32
47
47
27
4
19
30
43
25
13
0
12
27
41
40

Low 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

Medium Clouds (% Sky Obscured)

0
0
0
0
0
0
0
0
5
11
15
11
5
0
6
13
16
10
4
0
4
7
11
11

High Clouds (% Sky Obscured)

40
56
44
21
1
1
1
1
20
32
47
47
27
2
19
30
43
25
13
0
12
27
41
40

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)

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

Chance of Frost

Temperature (°C)

10
9
8
7
6
6
8
11
13
15
17
19
20
22
22
22
22
22
21
19
17
16
15
13

Feels Like (°C)

10
8
6
5
6
6
8
11
13
15
17
19
19
21
21
21
21
21
21
21
21
15
16
16

Dew Point (°C)

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

Relative Humidity (%)

69
72
74
77
79
81
78
72
66
61
56
49
42
39
34
34
34
35
42
49
60
62
62
64

Pressure (mb)

1023
1024
1024
1024
1024
1024
1024
1024
1024
1024
1023
1023
1022
1022
1021
1021
1020
1020
1020
1020
1019
1019
1020
1020

Ozone (du)

338
337
337
336
336
335
334
333
334
335
336
337
338
339
340
341
342
342
343
344
344
344
344
344

Saturday 30

Waxing Gibbous 99%

20:49

03:47

00 Bad
01 Bad
02 Bad
03 Bad
04 Bad
05 Bad
06 OK
07 OK
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

Sun - Rise: 04:58, Set: 21:01, Transit: 12:59. Moon - Rise: 20:49, Set: 03:47. Civil Dark: 21:43 - 04:15. Nautical Dark: 22:44 - 03:15. Astro Dark: 00:39 - N/A

Total Clouds (% Sky Obscured)

49
52
67
57
57
49
42
41
47
55
60
73
79
84
79
78
66
62
58
58
55
62
66
69

Low Clouds (% Sky Obscured)

0
0
0
0
0
5
9
13
10
6
0
0
0
0
0
0
0
0
0
0
0
0
0
0

Medium Clouds (% Sky Obscured)

10
6
6
6
7
9
15
19
24
27
28
38
48
57
47
34
23
20
18
15
21
21
20
17

High Clouds (% Sky Obscured)

49
52
57
57
57
49
42
41
47
55
60
73
79
84
79
78
66
62
58
58
55
62
66
69

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 (%)

1
0
4
4
2
4
3
0
2
6
12
21
23
10
33
31
17
14
12
0
1
0
0
8

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
4
3
3
3
3
3
3
3
4
5
5
5
6
5
5
5
4
5
6
4
3
2

Chance of Frost

Temperature (°C)

12
12
12
12
12
12
14
16
18
19
21
23
24
25
26
26
26
27
26
25
23
22
20
19

Feels Like (°C)

15
15
15
12
12
14
13
13
12
19
19
19
20
20
21
26
26
26
27
27
28
23
23
23

Dew Point (°C)

6
6
7
7
7
8
9
9
10
10
10
10
11
11
12
12
13
13
14
16
17
16
16
15

Relative Humidity (%)

66
68
71
72
75
77
70
65
60
54
49
44
43
42
41
41
42
41
49
57
66
69
74
78

Pressure (mb)

1019
1019
1019
1019
1019
1018
1018
1018
1018
1018
1018
1018
1017
1017
1016
1016
1015
1015
1014
1014
1014
1014
1014
1013

Ozone (du)

344
345
345
346
347
347
346
345
344
344
344
344
344
344
344
344
343
342
342
342
341
341
341
341

Sunday 31

Full Moon 100%

21:54

04:17

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)

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: 25/05/26 00:38:17. Forecast: 25/05/26 to 31/05/26. Timezone: UTC+2.00