Bouse
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bouse clear sky chart from 2005-11-06 to 2024-03-18.

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
76%
24625
39%
79581
34%
24549
82%
24549
58%
34632

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
72%
748
42%
3973
36%
736
79%
736
39%
1445
January11th to 20thNight
72%
747
45%
3895
36%
740
79%
740
43%
1311
January21st to endNight
65%
828
27%
4170
35%
814
76%
814
31%
1920
February1st to 10thNight
68%
760
40%
2280
35%
760
78%
760
54%
1070
February11th to 20thNight
65%
740
38%
2218
33%
740
75%
740
53%
1060
February21st to endNight
62%
628
36%
1884
33%
628
72%
628
52%
907
March1st to 10thNight
63%
760
37%
2206
29%
760
75%
760
56%
1052
March11th to 20thNight
69%
752
39%
2068
32%
752
77%
752
59%
1009
March21st to endNight
66%
792
38%
2178
27%
792
75%
792
59%
1053
April1st to 10thNight
69%
720
36%
1970
23%
720
77%
720
62%
932
April11th to 20thNight
65%
711
42%
1779
22%
711
75%
711
70%
847
April21st to endNight
71%
558
48%
1638
32%
558
82%
558
76%
653
May1st to 10thNight
75%
540
45%
1620
32%
540
82%
540
72%
640
May11th to 20thNight
75%
531
43%
1594
32%
531
81%
531
73%
638
May21st to endNight
77%
582
41%
1746
29%
582
83%
582
80%
663
June1st to 10thNight
83%
540
38%
1620
32%
540
85%
540
77%
628
June11th to 20thNight
86%
540
41%
1620
34%
540
88%
540
84%
597
June21st to endNight
88%
540
37%
1620
32%
540
90%
540
76%
638
July1st to 10thNight
91%
525
33%
1575
29%
525
91%
525
65%
685
July11th to 20thNight
87%
522
32%
1566
27%
522
87%
522
53%
745
July21st to endNight
85%
591
34%
1674
29%
558
86%
558
50%
834
August1st to 10thNight
90%
537
39%
1602
32%
534
91%
534
64%
699
August11th to 20thNight
88%
647
38%
1715
28%
647
88%
647
62%
849
August21st to endNight
88%
792
41%
1980
31%
792
89%
792
66%
990
September1st to 10thNight
85%
720
37%
1970
31%
720
86%
720
61%
959
September11th to 20thNight
88%
720
47%
1980
41%
720
91%
720
79%
825
September21st to endNight
85%
720
44%
1980
36%
720
89%
720
74%
864
October1st to 10thNight
78%
720
41%
1980
33%
720
83%
720
65%
923
October11th to 20thNight
84%
720
48%
2076
43%
720
89%
720
77%
842
October21st to endNight
81%
792
47%
2376
42%
792
88%
792
75%
938
November1st to 10thNight
82%
740
42%
2364
42%
740
86%
740
65%
960
November11th to 20thNight
81%
760
42%
2470
42%
760
86%
760
65%
999
November21st to endNight
71%
760
40%
2470
38%
760
80%
760
56%
1087
December1st to 10thNight
73%
760
39%
2470
38%
760
79%
760
51%
1140
December11th to 20thNight
71%
758
36%
2923
36%
758
77%
758
39%
1429
December21st to endNight
67%
824
24%
4331
36%
817
74%
817
34%
1801

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
3212323346%72%
79142
Night
3212323345%72%
80720
TransparencyDay
15%2411%25%43%
78869
Night
15%2312%25%42%
80515
SeeingDay
3415%33%32%13%
14353
Night
3214%41%36%4
24678

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
4424323345%66%
2858
11th to 20thDay
3313324435%68%
2860
21st to endDay
9%41442345%6%57%
3210
February1st to 10thDay
3313323336%70%
1900
11th to 20thDay
4313323447%66%
1850
21st to endDay
4214423346%68%
1570
March1st to 10thDay
421222245%6%69%
1972
11th to 20thDay
321232235%6%70%
2058
21st to endDay
3212323235%75%
2178
April1st to 10thDay
2212223447%71%
1986
11th to 20thDay
2112112335%80%
2129
21st to endDay
1111112235%82%
2322
May1st to 10thDay
1112212345%79%
2340
11th to 20thDay
211111222484%
2301
21st to endDay
11111122485%
2530
June1st to 10thDay
11211122385%
2340
11th to 20thDay
111111291%
2340
21st to endDay
111221123384%
2340
July1st to 10thDay
1113323446%73%
2340
11th to 20thDay
2213425%46%8%63%
2340
21st to endDay
5%224445%6%7%9%52%
2545
August1st to 10thDay
2213424446%68%
2328
11th to 20thDay
2212324447%69%
2183
21st to endDay
321232345%7%70%
2376
September1st to 10thDay
3313424345%68%
1988
11th to 20thDay
21111122384%
1980
21st to endDay
211322223478%
1980
October1st to 10thDay
3112222335%77%
1980
11th to 20thDay
11211222485%
1882
21st to endDay
112212235%82%
1980
November1st to 10thDay
1111223336%78%
1711
11th to 20thDay
1212222345%76%
1710
21st to endDay
3223222347%69%
1710
December1st to 10thDay
4414433347%63%
1710
11th to 20thDay
33245%345%6%7%57%
2169
21st to endDay
6%5%2432346%8%56%
3146
January1st to 10thNight
4313323445%68%
4097
11th to 20thNight
331232345%7%68%
4110
21st to endNight
10%42332335%6%59%
4455
February1st to 10thNight
4414223346%68%
2280
11th to 20thNight
5%223432235%69%
2218
21st to endNight
5%31332345%6%66%
1884
March1st to 10thNight
421333345%6%67%
2206
11th to 20thNight
3314223346%69%
2068
21st to endNight
3213223446%69%
2178
April1st to 10thNight
2212222446%71%
1970
11th to 20thNight
121221233480%
1779
21st to endNight
11111224482%
1638
May1st to 10thNight
111212235%80%
1620
11th to 20thNight
211111122384%
1594
21st to endNight
1111222487%
1746
June1st to 10thNight
111121213484%
1620
11th to 20thNight
111112389%
1620
21st to endNight
111111223483%
1620
July1st to 10thNight
111132245%6%74%
1620
11th to 20thNight
32134235%5%8%65%
1620
21st to endNight
2224435%5%6%10%58%
1773
August1st to 10thNight
2112223447%72%
1611
11th to 20thNight
221232345%7%69%
1715
21st to endNight
211232345%7%70%
1980
September1st to 10thNight
211242345%5%71%
1970
11th to 20thNight
11111223485%
1980
21st to endNight
111121223482%
1980
October1st to 10thNight
2112223345%73%
1980
11th to 20thNight
11221112385%
2076
21st to endNight
111221223483%
2376
November1st to 10thNight
2212222235%77%
2364
11th to 20thNight
121322233477%
2470
21st to endNight
431321334472%
2470
December1st to 10thNight
5%31332335%7%65%
2470
11th to 20thNight
5%42442445%7%59%
3041
21st to endNight
6%31343445%5%62%
4521

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
22%2413%38%22%
2859
11th to 20thDay
19%25%21%34%18%
2860
21st to endDay
27%48%13%32%16%
3210
February1st to 10thDay
18%2413%27%36%
1900
11th to 20thDay
18%3314%28%34%
1860
21st to endDay
18%2415%30%31%
1570
March1st to 10thDay
16%2314%30%35%
1972
11th to 20thDay
17%2412%27%38%
2058
21st to endDay
15%1212%32%37%
2178
April1st to 10thDay
13%2311%30%41%
1986
11th to 20thDay
10%128%26%54%
2132
21st to endDay
7%128%28%53%
2322
May1st to 10thDay
9%238%26%52%
2340
11th to 20thDay
7%127%22%61%
2304
21st to endDay
7%115%22%64%
2530
June1st to 10thDay
8%11319%68%
2340
11th to 20thDay
411211%82%
2340
21st to endDay
9%11310%75%
2340
July1st to 10thDay
12%447%14%60%
2276
11th to 20thDay
17%5%7%18%24%30%
2271
21st to endDay
25%7%9%18%19%22%
2404
August1st to 10thDay
17%4413%23%39%
2313
11th to 20thDay
15%4414%28%35%
2183
21st to endDay
15%3412%28%38%
2376
September1st to 10thDay
20%3411%19%43%
1988
11th to 20thDay
8%127%21%62%
1980
21st to endDay
12%227%17%60%
1980
October1st to 10thDay
12%2310%23%49%
1980
11th to 20thDay
8%127%23%60%
1882
21st to endDay
8%138%24%55%
1980
November1st to 10thDay
10%2311%31%44%
1711
11th to 20thDay
12%2311%27%45%
1710
21st to endDay
17%2410%30%37%
1710
December1st to 10thDay
23%25%15%23%32%
1710
11th to 20thDay
24%26%22%28%18%
2168
21st to endDay
24%36%24%26%16%
3146
January1st to 10thNight
19%3314%34%28%
4097
11th to 20thNight
16%2322%37%20%
4110
21st to endNight
27%36%16%27%21%
4455
February1st to 10thNight
19%2312%26%38%
2280
11th to 20thNight
20%2412%24%38%
2219
21st to endNight
20%2411%26%37%
1884
March1st to 10thNight
18%2313%28%35%
2206
11th to 20thNight
18%2312%25%40%
2068
21st to endNight
17%2311%29%39%
2178
April1st to 10thNight
15%2310%26%44%
1970
11th to 20thNight
11%227%25%53%
1779
21st to endNight
7%128%25%56%
1638
May1st to 10thNight
8%128%26%54%
1620
11th to 20thNight
8%217%21%61%
1595
21st to endNight
6%125%24%62%
1746
June1st to 10thNight
8%11318%70%
1620
11th to 20thNight
5%11212%79%
1620
21st to endNight
8%2139%77%
1620
July1st to 10thNight
12%347%13%60%
1575
11th to 20thNight
17%46%17%23%33%
1566
21st to endNight
19%5%8%22%20%26%
1674
August1st to 10thNight
13%2413%24%44%
1602
11th to 20thNight
15%4316%27%36%
1715
21st to endNight
13%4414%27%38%
1980
September1st to 10thNight
15%45%12%20%43%
1970
11th to 20thNight
7%227%20%63%
1980
21st to endNight
9%227%17%62%
1980
October1st to 10thNight
14%249%20%51%
1980
11th to 20thNight
8%117%19%64%
2076
21st to endNight
9%138%20%61%
2376
November1st to 10thNight
12%219%26%50%
2364
11th to 20thNight
12%138%26%49%
2470
21st to endNight
18%1311%28%40%
2470
December1st to 10thNight
20%3315%23%37%
2470
11th to 20thNight
26%2413%29%25%
3041
21st to endNight
23%35%19%32%17%
4521

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
7%6%23%35%25%4
270
11th to 20thDay
8%413%35%32%8%
270
21st to endDay
46%21%32%25%12%
335
February1st to 10thDay
5%6%22%31%27%8%
460
11th to 20thDay
6%8%26%33%22%4
455
21st to endDay
5%10%26%38%18%3
382
March1st to 10thDay
5%8%25%39%20%3
460
11th to 20thDay
49%19%33%27%8%
449
21st to endDay
412%25%33%20%6%
462
April1st to 10thDay
36%22%37%24%8%
420
11th to 20thDay
311%28%31%20%6%
412
21st to endDay
27%26%29%24%12%
420
May1st to 10thDay
15%18%35%30%11%
423
11th to 20thDay
2321%34%29%11%
448
21st to endDay
2423%34%25%12%
485
June1st to 10thDay
1412%34%36%12%
450
11th to 20thDay
116%33%31%18%
450
21st to endDay
218%40%35%15%
450
July1st to 10thDay
15%37%37%20%
446
11th to 20thDay
1226%45%25%
444
21st to endDay
31319%45%29%
487
August1st to 10thDay
21429%44%21%
447
11th to 20thDay
21327%41%27%
437
21st to endDay
2225%43%27%
495
September1st to 10thDay
337%28%40%19%
450
11th to 20thDay
218%34%43%14%
450
21st to endDay
3314%30%35%15%
450
October1st to 10thDay
3315%34%31%13%
450
11th to 20thDay
1214%33%35%15%
352
21st to endDay
1318%27%34%19%
297
November1st to 10thDay
1311%38%37%10%
270
11th to 20thDay
2311%34%39%12%
270
21st to endDay
2418%37%25%14%
270
December1st to 10thDay
6%114%39%31%10%
270
11th to 20thDay
217%37%35%9%
270
21st to endDay
9%6%21%37%21%6%
297
January1st to 10thNight
6%215%44%29%4
760
11th to 20thNight
5%216%42%30%5%
760
21st to endNight
8%317%45%25%3
836
February1st to 10thNight
5%418%40%28%4
760
11th to 20thNight
5%320%46%23%2
744
21st to endNight
7%323%46%18%3
628
March1st to 10thNight
4426%46%19%2
760
11th to 20thNight
4319%38%30%6%
752
21st to endNight
35%22%43%24%3
792
April1st to 10thNight
2320%45%27%3
720
11th to 20thNight
2425%42%24%3
711
21st to endNight
1322%45%25%3
558
May1st to 10thNight
1417%48%28%2
540
11th to 20thNight
2219%41%33%3
531
21st to endNight
1217%48%28%3
584
June1st to 10thNight
1112%45%37%3
540
11th to 20thNight
112%49%37%2
540
21st to endNight
117%42%45%4
540
July1st to 10thNight
2338%54%4
525
11th to 20thNight
3223%66%5%
522
21st to endNight
3324%62%8%
591
August1st to 10thNight
2326%63%6%
537
11th to 20thNight
2425%60%8%
647
21st to endNight
21322%63%9%
792
September1st to 10thNight
216%28%57%6%
720
11th to 20thNight
116%36%48%7%
720
21st to endNight
219%36%46%6%
720
October1st to 10thNight
2214%43%37%2
720
11th to 20thNight
2110%45%39%5%
720
21st to endNight
1211%40%37%9%
792
November1st to 10thNight
2110%49%33%5%
740
11th to 20thNight
2210%43%36%7%
760
21st to endNight
5%116%43%31%5%
760
December1st to 10thNight
6%112%46%32%3
760
11th to 20thNight
6%314%45%30%3
760
21st to endNight
7%316%47%23%4
836
Page generated at 2024-03-15 11:01:43. Version ac07

Copyright © 2024 Attilla Danko.


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