Beggars Canyon
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Beggars Canyon clear sky chart from 2005-11-06 to 2024-01-14.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
43%
22523
15%
74802
13%
22487
49%
22487
22%
48780

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 10thNight
22%
756
4%
2646
2%
756
25%
756
5%
2254
January11th to 20thNight
28%
736
6%
2574
5%
736
31%
736
8%
2097
January21st to endNight
33%
792
6%
2713
4%
792
36%
792
10%
2160
February1st to 10thNight
33%
720
8%
2340
6%
720
36%
720
13%
1773
February11th to 20thNight
36%
700
12%
2274
10%
700
41%
700
17%
1577
February21st to endNight
33%
592
12%
1793
10%
592
37%
592
15%
1278
March1st to 10thNight
37%
720
10%
2157
8%
720
40%
720
16%
1563
March11th to 20thNight
39%
720
14%
1980
10%
720
43%
720
20%
1386
March21st to endNight
30%
792
11%
2073
4%
792
34%
792
18%
1512
April1st to 10thNight
35%
720
11%
1800
4%
720
37%
720
24%
1268
April11th to 20thNight
37%
711
16%
1779
7%
711
41%
711
28%
1170
April21st to endNight
41%
579
16%
1659
9%
579
47%
579
28%
1023
May1st to 10thNight
46%
360
21%
1440
20%
360
56%
360
30%
705
May11th to 20thNight
53%
354
18%
1416
20%
354
59%
354
28%
733
May21st to endNight
52%
388
12%
1552
14%
388
59%
388
27%
821
June1st to 10thNight
45%
360
11%
1440
13%
360
52%
360
23%
799
June11th to 20thNight
41%
360
16%
1440
15%
360
54%
360
33%
648
June21st to endNight
54%
360
20%
1440
25%
360
65%
360
41%
593
July1st to 10thNight
62%
350
20%
1400
25%
350
73%
350
56%
498
July11th to 20thNight
60%
348
28%
1392
33%
348
76%
348
61%
479
July21st to endNight
69%
394
35%
1488
40%
372
84%
372
70%
463
August1st to 10thNight
73%
401
34%
1467
35%
399
82%
399
60%
545
August11th to 20thNight
77%
534
35%
1602
27%
534
82%
534
64%
688
August21st to endNight
59%
776
36%
1964
18%
776
65%
776
61%
962
September1st to 10thNight
65%
720
33%
1800
17%
720
69%
720
67%
872
September11th to 20thNight
63%
720
30%
1800
18%
720
66%
720
49%
1007
September21st to endNight
61%
720
28%
2031
22%
720
65%
720
44%
1089
October1st to 10thNight
54%
720
20%
2160
17%
720
60%
720
36%
1243
October11th to 20thNight
53%
720
21%
2160
20%
720
58%
720
29%
1331
October21st to endNight
45%
792
20%
2494
16%
792
52%
792
24%
1597
November1st to 10thNight
41%
740
14%
2433
12%
740
45%
740
17%
1728
November11th to 20thNight
34%
760
8%
2660
7%
760
37%
760
10%
2032
November21st to endNight
38%
760
9%
2660
6%
760
44%
760
14%
1942
December1st to 10thNight
32%
760
8%
2660
6%
760
35%
760
9%
2095
December11th to 20thNight
27%
759
3%
3274
3%
759
29%
759
4%
2860
December21st to endNight
23%
829
5%
4841
5%
817
28%
817
4%
3989

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
10%7%36%5%3445%7%44%
74772
Night
12%9%47%5%3445%6%41%
75007
TransparencyDay
39%6%14%23%15%5%
74475
Night
42%7%15%21%12%3
74825
SeeingDay
16%17%28%23%14%3
13407
Night
15%10%22%32%18%2
22540

By Month

Percentage Cloud Cover SW (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
24%18%7%12%8%45%33411%
1519
11th to 20thDay
20%15%7%11%10%5%6%5%45%14%
1464
21st to endDay
17%12%6%13%9%45%5%5%7%16%
1642
February1st to 10thDay
19%13%5%7%6%36%6%5%7%23%
1620
11th to 20thDay
15%9%5%7%5%46%5%7%8%28%
1575
21st to endDay
12%12%410%8%47%6%5%6%28%
1462
March1st to 10thDay
13%11%5%6%7%37%7%7%8%25%
1800
11th to 20thDay
14%10%49%9%36%6%7%9%24%
1980
21st to endDay
12%10%48%7%5%7%6%7%7%26%
2282
April1st to 10thDay
11%9%48%6%47%6%7%8%31%
2160
11th to 20thDay
9%9%36%6%47%6%6%7%36%
2129
21st to endDay
6%5%25%5%46%7%7%9%43%
2297
May1st to 10thDay
6%5%36%5%35%5%6%8%50%
2520
11th to 20thDay
9%7%35%5%35%5%7%10%41%
2477
21st to endDay
9%6%35%5%36%6%6%8%45%
2723
June1st to 10thDay
8%6%35%5%35%5%6%8%47%
2520
11th to 20thDay
5%425%5%45%45%10%52%
2520
21st to endDay
3313324446%67%
2520
July1st to 10thDay
1212222345%76%
2520
11th to 20thDay
3112222335%77%
2520
21st to endDay
211111222385%
2741
August1st to 10thDay
2212212345%78%
2462
11th to 20thDay
1211223336%77%
2298
21st to endDay
2113323346%71%
2391
September1st to 10thDay
3212322346%74%
2160
11th to 20thDay
5%31443445%7%59%
2160
21st to endDay
7%5%24434446%56%
1927
October1st to 10thDay
8%6%25%5%3447%7%49%
1800
11th to 20thDay
10%6%46%6%35%5%6%8%42%
1800
21st to endDay
16%8%47%6%445%48%35%
1860
November1st to 10thDay
16%11%49%6%46%6%5%8%26%
1641
11th to 20thDay
17%14%6%10%7%46%5%5%7%19%
1520
21st to endDay
17%12%48%8%5%5%5%6%7%23%
1520
December1st to 10thDay
17%15%8%11%7%34345%24%
1520
11th to 20thDay
22%19%10%15%7%33345%10%
1928
21st to endDay
23%19%8%13%8%44235%11%
2794
January1st to 10thNight
21%17%6%12%7%45%45%5%15%
2646
11th to 20thNight
22%15%6%11%6%34446%19%
2574
21st to endNight
17%12%5%10%7%45%45%8%23%
2713
February1st to 10thNight
16%14%5%8%5%35%45%8%27%
2340
11th to 20thNight
14%10%48%6%35%45%6%35%
2272
21st to endNight
12%13%5%8%6%35%5%6%8%29%
1793
March1st to 10thNight
15%9%37%6%46%6%7%8%29%
2157
11th to 20thNight
11%8%36%7%46%5%7%9%32%
1980
21st to endNight
12%10%5%7%8%36%6%7%6%31%
2073
April1st to 10thNight
12%9%47%6%35%6%5%10%34%
1800
11th to 20thNight
9%7%25%5%45%5%6%7%44%
1779
21st to endNight
7%5%25%5%346%9%10%45%
1659
May1st to 10thNight
6%425%5%345%5%8%54%
1440
11th to 20thNight
7%5%25%5%25%5%7%9%49%
1416
21st to endNight
5%5%35%435%6%7%10%48%
1552
June1st to 10thNight
9%5%35%5%36%5%5%8%47%
1440
11th to 20thNight
5%43442445%8%58%
1440
21st to endNight
3313425%445%68%
1440
July1st to 10thNight
212213345%77%
1440
11th to 20thNight
112311435%80%
1440
21st to endNight
11111123386%
1576
August1st to 10thNight
222212335%78%
1475
11th to 20thNight
31231223478%
1602
21st to endNight
212312345%76%
1964
September1st to 10thNight
2213222335%76%
1800
11th to 20thNight
4413434446%63%
1800
21st to endNight
7%31442445%6%60%
2031
October1st to 10thNight
9%6%25%42345%7%55%
2160
11th to 20thNight
11%6%26%435%45%7%47%
2160
21st to endNight
14%8%25%5%3445%7%43%
2494
November1st to 10thNight
18%7%47%5%36%6%6%7%32%
2433
11th to 20thNight
19%11%5%7%7%45%5%5%6%27%
2660
21st to endNight
14%10%5%8%7%46%5%5%7%30%
2660
December1st to 10thNight
18%13%6%9%7%35%445%25%
2660
11th to 20thNight
23%16%6%12%8%45%445%12%
3276
21st to endNight
21%19%7%10%6%34345%18%
4862

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
76%7%8%8%1
1519
11th to 20thDay
72%6%13%7%1
1464
21st to endDay
67%8%12%10%3
1642
February1st to 10thDay
61%8%17%11%2
1620
11th to 20thDay
51%9%18%18%4
1584
21st to endDay
51%9%17%15%8%
1462
March1st to 10thDay
52%9%14%18%7%
1800
11th to 20thDay
52%7%15%21%4
1980
21st to endDay
52%9%18%18%4
2282
April1st to 10thDay
45%8%18%21%9%
2160
11th to 20thDay
42%8%18%19%11%2
2132
21st to endDay
31%8%21%25%13%2
2297
May1st to 10thDay
30%6%17%31%16%1
2520
11th to 20thDay
36%5%17%27%14%2
2480
21st to endDay
33%7%20%28%11%1
2724
June1st to 10thDay
33%6%15%31%13%2
2520
11th to 20thDay
27%417%38%13%2
2520
21st to endDay
18%315%35%21%8%
2520
July1st to 10thDay
11%312%30%30%15%
2451
11th to 20thDay
12%28%22%35%20%
2445
21st to endDay
7%2423%41%22%
2589
August1st to 10thDay
11%310%28%34%14%
2445
11th to 20thDay
11%210%30%33%13%
2298
21st to endDay
15%49%33%32%7%
2391
September1st to 10thDay
12%210%34%28%14%
2160
11th to 20thDay
24%416%25%24%7%
2160
21st to endDay
30%414%28%18%5%
1927
October1st to 10thDay
33%7%14%27%17%3
1800
11th to 20thDay
39%7%18%22%13%1
1800
21st to endDay
49%7%13%21%9%
1860
November1st to 10thDay
56%8%13%18%4
1641
11th to 20thDay
62%10%13%12%3
1520
21st to endDay
60%8%15%11%5%1
1520
December1st to 10thDay
64%6%12%15%4
1520
11th to 20thDay
78%5%9%6%1
1928
21st to endDay
79%47%8%1
2794
January1st to 10thNight
71%8%11%8%1
2646
11th to 20thNight
67%7%12%10%4
2574
21st to endNight
60%10%14%14%21
2713
February1st to 10thNight
55%9%19%14%3
2340
11th to 20thNight
47%9%19%20%5%1
2274
21st to endNight
48%9%17%19%5%1
1793
March1st to 10thNight
48%10%16%18%6%1
2157
11th to 20thNight
46%7%19%22%6%
1980
21st to endNight
48%8%20%19%5%
2073
April1st to 10thNight
42%8%19%22%8%1
1800
11th to 20thNight
36%7%20%24%11%2
1779
21st to endNight
31%9%19%27%11%2
1659
May1st to 10thNight
27%5%20%34%14%1
1440
11th to 20thNight
29%6%21%29%12%2
1416
21st to endNight
29%8%26%27%9%1
1552
June1st to 10thNight
35%6%15%34%9%1
1440
11th to 20thNight
23%422%38%12%1
1440
21st to endNight
19%313%38%21%6%
1440
July1st to 10thNight
11%415%28%28%15%
1400
11th to 20thNight
9%311%25%34%18%
1392
21st to endNight
6%26%21%44%21%
1488
August1st to 10thNight
11%39%32%32%13%
1467
11th to 20thNight
12%210%31%33%11%
1602
21st to endNight
12%49%33%34%8%
1964
September1st to 10thNight
11%313%32%27%14%
1800
11th to 20thNight
22%5%13%29%19%11%
1800
21st to endNight
24%415%29%22%6%
2031
October1st to 10thNight
31%5%12%26%24%2
2160
11th to 20thNight
36%6%15%26%14%2
2160
21st to endNight
39%8%14%23%15%1
2494
November1st to 10thNight
50%8%15%21%7%
2433
11th to 20thNight
58%9%14%15%4
2660
21st to endNight
52%9%16%17%5%1
2660
December1st to 10thNight
63%7%12%14%3
2660
11th to 20thNight
74%8%10%6%1
3276
21st to endNight
71%6%9%12%2
4862

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
32%21%16%21%11%1
180
11th to 20thDay
31%14%21%23%8%2
166
21st to endDay
27%9%26%25%12%1
234
February1st to 10thDay
29%17%23%22%9%1
340
11th to 20thDay
28%19%27%20%6%1
335
21st to endDay
21%22%26%22%8%1
338
March1st to 10thDay
22%21%29%19%8%1
420
11th to 20thDay
21%19%26%24%8%1
420
21st to endDay
23%23%27%20%7%1
462
April1st to 10thDay
26%22%26%15%7%2
420
11th to 20thDay
19%29%26%15%7%3
412
21st to endDay
16%25%31%19%7%2
420
May1st to 10thDay
14%22%29%21%11%3
423
11th to 20thDay
20%15%31%16%15%4
448
21st to endDay
13%16%31%25%12%4
485
June1st to 10thDay
14%22%28%20%14%3
450
11th to 20thDay
14%26%33%16%10%1
450
21st to endDay
7%15%33%26%16%3
450
July1st to 10thDay
410%42%29%13%2
446
11th to 20thDay
5%16%32%27%17%3
444
21st to endDay
211%33%28%20%6%
487
August1st to 10thDay
5%8%32%26%20%9%
447
11th to 20thDay
38%28%27%26%8%
437
21st to endDay
6%14%28%25%20%6%
495
September1st to 10thDay
411%29%27%22%6%
450
11th to 20thDay
9%12%27%25%24%3
450
21st to endDay
12%15%24%28%18%3
450
October1st to 10thDay
12%15%27%22%18%5%
450
11th to 20thDay
18%14%20%25%17%6%
450
21st to endDay
20%18%23%22%13%5%
375
November1st to 10thDay
24%14%21%28%11%2
255
11th to 20thDay
27%17%19%23%11%3
180
21st to endDay
24%11%21%27%16%2
180
December1st to 10thDay
26%12%20%21%16%6%
180
11th to 20thDay
32%13%22%25%7%1
180
21st to endDay
25%15%22%24%14%1
198
January1st to 10thNight
28%12%21%27%11%1
760
11th to 20thNight
27%8%19%30%14%2
736
21st to endNight
23%9%17%32%18%2
792
February1st to 10thNight
25%11%21%29%13%1
720
11th to 20thNight
20%13%23%29%15%1
704
21st to endNight
20%17%22%30%11%1
592
March1st to 10thNight
19%13%21%31%14%1
720
11th to 20thNight
16%14%22%35%13%
720
21st to endNight
17%15%28%28%10%2
792
April1st to 10thNight
17%15%25%29%14%1
720
11th to 20thNight
15%17%26%24%15%3
711
21st to endNight
10%17%28%30%15%1
579
May1st to 10thNight
10%13%26%33%16%1
360
11th to 20thNight
8%8%24%36%21%2
354
21st to endNight
7%8%29%38%16%3
389
June1st to 10thNight
11%11%29%31%17%1
360
11th to 20thNight
11%13%32%31%12%1
360
21st to endNight
413%25%35%23%1
360
July1st to 10thNight
38%23%42%23%1
350
11th to 20thNight
1432%45%17%1
348
21st to endNight
26%22%42%28%1
394
August1st to 10thNight
25%16%47%26%3
401
11th to 20thNight
3412%34%38%8%
534
21st to endNight
310%25%35%23%4
776
September1st to 10thNight
36%23%34%30%4
720
11th to 20thNight
6%5%21%31%31%6%
720
21st to endNight
7%8%19%34%29%3
720
October1st to 10thNight
11%7%20%38%21%3
720
11th to 20thNight
14%9%18%32%24%3
720
21st to endNight
18%10%21%31%18%3
792
November1st to 10thNight
19%11%21%35%14%1
740
11th to 20thNight
26%10%21%29%14%1
760
21st to endNight
16%8%24%33%15%3
760
December1st to 10thNight
23%9%20%31%16%2
760
11th to 20thNight
28%8%19%32%13%1
760
21st to endNight
28%14%20%28%9%1
836
Page generated at 2024-01-11 10:32:02. Version ac07

Copyright 2024 Attilla Danko


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