Clear Outside v1.0 - International Weather Forecasts For Astronomers

Tuesday 25

Waxing Gibbous 95%

19:14

03:41

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

Sun - Rise: 06:02, Set: 20:02, Transit: 13:02. Moon - Rise: 19:14, Set: 03:41. Civil Dark: 20:38 - 05:26. Nautical Dark: 21:23 - 04:43. Astro Dark: 22:14 - 03:53

Total Clouds (% Sky Obscured)

26
27
38
82
92
89
86
78
79
76
78
70
59
73
88
98
99
100
100
100
100
100
100
100

Low Clouds (% Sky Obscured)

0
6
19
20
22
25
31
23
17
0
0
0
0
1
13
37
64
71
76
74
67
66
50
58

Medium Clouds (% Sky Obscured)

12
17
16
16
24
24
19
11
51
73
78
70
28
73
88
82
74
69
69
100
100
92
95
90

High Clouds (% Sky Obscured)

26
27
38
50
55
60
50
60
55
47
45
40
17
3
5
65
97
100
100
99
100
100
100
100

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
8
9
9
9
4
3
4
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
Light Rain
Light Rain
Light Rain
Very Light Rain
None
Very Light Rain
Light Rain

Precipitation Probability (%)

0
0
0
0
0
0
0
0
0
0
1
1
1
16
17
13
33
75
95
95
63
41
66
95

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0.6
1.8
1.3
0.3
0
0.3
0.9

Wind Speed/Direction (mph)

5
5
6
11
12
14
14
14
14
14
14
13
13
13
11
10
8
8
7
6
5
5
5
5

Chance of Frost

Temperature (°C)

14
14
14
15
17
19
21
23
24
25
25
24
24
23
21
20
18
18
17
17
17
17
17
17

Feels Like (°C)

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

Dew Point (°C)

11
11
11
11
10
9
9
8
7
8
9
10
10
10
10
10
10
10
13
16
16
16
16
16

Relative Humidity (%)

86
84
83
75
62
49
43
38
34
34
36
39
43
44
49
55
58
58
74
92
95
93
95
93

Pressure (mb)

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

Ozone (du)

323
324
324
323
319
316
316
317
319
319
318
317
318
316
315
314
313
312
314
316
319
321
324
325

Wednesday 26

Waxing Gibbous 99%

19:31

04:58

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
01 Bad
02 Bad
03 Bad
04 Bad

Sun - Rise: 06:04, Set: 20:00, Transit: 13:02. Moon - Rise: 19:31, Set: 04:58. Civil Dark: 20:36 - 05:28. Nautical Dark: 21:21 - 04:45. Astro Dark: 22:11 - 03:55

Total Clouds (% Sky Obscured)

100
94
98
94
93
76
59
51
50
77
87
100
100
100
100
100
85
100
99
99
100
100
100
100

Low Clouds (% Sky Obscured)

61
80
94
90
92
62
39
39
40
36
53
89
83
22
13
7
5
8
14
52
78
29
37
76

Medium Clouds (% Sky Obscured)

81
63
15
9
0
9
27
0
2
28
8
7
2
0
69
77
63
56
86
91
100
100
86
98

High Clouds (% Sky Obscured)

100
64
73
35
12
13
2
3
3
8
79
99
100
100
100
100
72
100
95
93
63
100
100
86

ISS Passover

Visibility (miles)

4
4
4
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
3
9
9
4

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
Light Rain
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None

Precipitation Probability (%)

95
95
86
52
23
18
22
12
12
12
15
37
46
17
2
0
0
0
1
24
23
25
35
51

Precipitation Amount (mm)

1.2
1.4
0.4
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
6
7
9
8
7
6
6
6
6
7
8
8
8
8
6
5
7
6
7
6
5
5
5

Chance of Frost

Temperature (°C)

17
17
17
18
18
20
21
23
24
25
26
26
25
24
23
22
21
20
19
18
18
19
19
18

Feels Like (°C)

17
17
17
17
18
20
22
24
25
26
26
25
24
22
22
22
20
19
18
18
18
19
19
19

Dew Point (°C)

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

Relative Humidity (%)

93
96
96
89
85
80
69
59
51
45
41
40
45
49
52
58
62
67
73
76
82
82
82
85

Pressure (mb)

1011
1011
1012
1012
1012
1012
1012
1012
1012
1011
1011
1011
1011
1011
1011
1011
1011
1011
1011
1011
1010
1010
1009
1008

Ozone (du)

327
327
326
326
327
326
324
322
321
320
319
319
319
319
320
318
320
318
317
317
318
316
315
317

Thursday 27

Waxing Gibbous 100%

19:45

04:58

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
01 Bad
02 Bad
03 Bad
04 Bad

Sun - Rise: 06:05, Set: 19:58, Transit: 13:02. Moon - Rise: 19:45, Set: 04:58. Civil Dark: 20:34 - 05:30. Nautical Dark: 21:18 - 04:47. Astro Dark: 22:08 - 03:58

Total Clouds (% Sky Obscured)

100
100
100
100
95
97
95
82
77
51
74
94
100
79
74
100
100
100
100
100
94
88
84
81

Low Clouds (% Sky Obscured)

36
31
35
95
52
32
49
68
36
38
40
39
37
17
9
5
3
9
41
54
66
70
62
34

Medium Clouds (% Sky Obscured)

96
95
77
89
81
94
79
79
0
2
30
16
62
4
10
51
100
100
100
99
94
88
84
5

High Clouds (% Sky Obscured)

100
100
100
100
39
72
73
23
32
19
74
78
100
68
65
100
100
100
100
100
77
55
32
31

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
9
7
8
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

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

Precipitation Probability (%)

62
95
89
22
22
16
6
15
7
1
0
0
0
0
4
1
11
51
43
42
41
17
1
2

Precipitation Amount (mm)

0.2
1.6
1.1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0.2
0
0
0
0
0
0

Wind Speed/Direction (mph)

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

Chance of Frost

Temperature (°C)

19
18
18
19
20
21
22
23
24
25
25
25
24
23
22
21
20
18
17
17
16
16
16
16

Feels Like (°C)

19
18
18
19
20
21
20
22
22
23
23
22
21
20
21
20
17
15
15
15
14
15
15
14

Dew Point (°C)

16
16
16
16
17
17
16
16
17
13
10
9
8
9
10
11
10
10
12
13
13
12
12
13

Relative Humidity (%)

82
85
86
82
82
75
70
64
63
48
37
35
35
39
44
52
54
58
72
78
83
78
75
82

Pressure (mb)

1008
1008
1008
1008
1008
1008
1008
1008
1007
1007
1007
1006
1006
1006
1006
1006
1006
1006
1007
1007
1007
1006
1006
1006

Ozone (du)

319
320
321
322
324
324
326
327
332
335
335
334
335
336
334
330
329
331
334
336
337
337
337
338

Friday 28

Full Moon 99%

19:57

06:15

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
01 Bad
02 Bad
03 Bad
04 Bad

Sun - Rise: 06:07, Set: 19:56, Transit: 13:01. Moon - Rise: 19:57, Set: 06:15. Civil Dark: 20:31 - 05:31. Nautical Dark: 21:15 - 04:49. Astro Dark: 22:05 - 04:00

Total Clouds (% Sky Obscured)

78
75
80
83
87
90
95
100
100
100
100
100
100
99
95
92
89
82
66
57
85
72
88
92

Low Clouds (% Sky Obscured)

34
31
29
30
31
32
32
28
34
39
32
36
23
20
17
34
65
62
49
50
57
65
71
47

Medium Clouds (% Sky Obscured)

5
0
1
3
7
13
12
20
32
100
100
36
29
26
68
67
45
45
8
4
5
8
85
92

High Clouds (% Sky Obscured)

21
15
15
15
25
50
75
100
100
100
100
99
98
98
91
38
34
25
15
2
35
6
25
8

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
1
1
1
10
15
20
33
42
46
42
31
5
6
7
0
1
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)

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

Chance of Frost

Temperature (°C)

15
15
15
16
17
19
20
20
21
22
21
21
21
20
20
19
18
17
16
16
16
16
16
16

Feels Like (°C)

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

Dew Point (°C)

13
13
12
12
12
12
11
9
7
6
4
4
4
6
7
7
8
10
11
12
13
14
14
14

Relative Humidity (%)

86
86
86
79
68
63
56
49
40
35
32
32
33
39
42
47
51
62
69
77
83
89
89
87

Pressure (mb)

1006
1006
1006
1006
1006
1006
1006
1006
1006
1005
1005
1005
1005
1005
1005
1005
1005
1006
1006
1006
1006
1006
1006
1006

Ozone (du)

337
337
338
337
337
337
337
338
338
337
334
333
332
332
331
329
329
324
319
318
316
317
317
314

Saturday 29

Waning Gibbous 96%

20:08

07:32

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 OK
01 Good
02 Good
03 Good
04 OK

Sun - Rise: 06:09, Set: 19:54, Transit: 13:01. Moon - Rise: 20:08, Set: 07:32. Civil Dark: 20:29 - 05:33. Nautical Dark: 21:13 - 04:51. Astro Dark: 22:02 - 04:03

Total Clouds (% Sky Obscured)

79
55
94
99
99
100
100
100
100
100
100
100
100
100
86
73
59
45
28
13
7
6
3
34

Low Clouds (% Sky Obscured)

37
37
61
84
26
62
48
60
68
75
82
90
96
100
86
71
57
44
28
13
7
6
3
34

Medium Clouds (% Sky Obscured)

65
6
74
97
10
22
69
87
91
95
99
94
86
75
49
28
6
1
0
0
0
0
0
0

High Clouds (% Sky Obscured)

16
23
43
67
99
100
100
100
100
100
100
96
91
82
56
28
0
0
0
0
0
0
0
0

ISS Passover

Visibility (miles)

9
9
9
9
9
9
9
9
9
7
4
2
4
7
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
Very Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
Light Rain
None
None
None
None
None

Precipitation Probability (%)

1
1
1
1
1
4
5
13
46
64
81
95
95
95
95
95
95
95
64
7
4
2
0
0

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0.3
0.5
0.7
0.9
1.4
1.5
1.6
1.9
1
0.4
0
0
0
0
0

Wind Speed/Direction (mph)

10
9
9
11
10
11
12
12
12
11
9
9
6
6
9
8
8
8
8
8
9
8
8
8

Chance of Frost

Temperature (°C)

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

Feels Like (°C)

14
15
15
14
15
16
16
16
17
16
16
16
15
14
13
14
15
15
16
17
17
14
15
14

Dew Point (°C)

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

Relative Humidity (%)

86
87
86
82
79
63
55
49
52
62
73
88
89
89
89
90
92
93
90
89
86
84
86
86

Pressure (mb)

1006
1007
1007
1008
1008
1008
1008
1008
1008
1007
1007
1007
1006
1006
1005
1006
1006
1006
1006
1007
1007
1008
1008
1008

Ozone (du)

311
309
307
305
303
301
300
298
299
301
302
304
305
307
309
309
310
310
309
309
308
307
307
307

Sunday 30

Waning Gibbous 91%

20:19

08:51

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
01 Bad
02 Bad
03 Bad
04 Bad

Sun - Rise: 06:10, Set: 19:51, Transit: 13:01. Moon - Rise: 20:19, Set: 08:51. Civil Dark: 20:27 - 05:35. Nautical Dark: 21:10 - 04:53. Astro Dark: 21:59 - 04:05

Total Clouds (% Sky Obscured)

64
83
85
89
95
95
95
95
87
78
69
72
74
74
67
60
50
47
44
41
50
60
70
67

Low Clouds (% Sky Obscured)

64
83
85
89
95
95
95
95
85
70
56
59
62
65
54
43
32
23
15
6
16
26
35
38

Medium Clouds (% Sky Obscured)

0
0
1
5
17
16
16
18
20
23
25
14
12
8
8
8
7
4
2
0
10
20
27
20

High Clouds (% Sky Obscured)

0
0
2
5
7
6
3
0
15
20
15
10
10
10
12
14
16
20
25
28
22
22
38
50

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

Precipitation Probability (%)

0
0
0
0
0
0
0
0
23
41
61
78
91
95
92
77
56
45
35
8
10
13
13
13

Precipitation Amount (mm)

0
0
0
0
0
0
0
0
0
0
0.3
0.4
0.7
0.8
0.7
0.5
0.3
0
0
0
0
0
0
0

Wind Speed/Direction (mph)

8
7
7
8
8
10
10
11
12
12
12
13
13
13
13
13
13
13
13
13
13
13
13
12

Chance of Frost

Temperature (°C)

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

Feels Like (°C)

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

Dew Point (°C)

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

Relative Humidity (%)

78
70
63
61
61
60
55
50
47
44
42
40
45
50
56
62
67
74
77
79
83
80
80
80

Pressure (mb)

1009
1009
1009
1010
1010
1010
1010
1009
1009
1008
1008
1007
1006
1006
1005
1005
1005
1005
1005
1005
1005
1004
1004
1004

Ozone (du)

306
306
306
307
308
309
311
313
315
316
318
319
322
325
328
329
329
330
331
332
333
335
336
337

Monday 31

Waning Gibbous 83%

20:32

10:11

Sun - Rise: 06:12, Set: 19:49, Transit: 13:01. Moon - Rise: 20:32, Set: 10:11. Civil Dark: 20:24 - 05:37. Nautical Dark: 21:08 - 04:55. Astro Dark: 21:56 - 04:08

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 Welwyn Garden City, Hertfordshire, United Kingdom (51.80,-0.21)

Generated: 25/08/26 05:06:45. Forecast: 25/08/26 to 31/08/26. Timezone: UTC+1.00