Infinity's Edge Observatory - CO
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Infinity's Edge Observatory - CO clear sky chart from 2005-11-06 to 2024-11-28.

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
49%
25443
27%
98551
16%
25219
61%
25219
34%
47921

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
42%
940
32%
4331
14%
926
59%
926
31%
1994
January11th to 20thNight
38%
852
39%
4106
19%
834
57%
834
38%
1480
January21st to endNight
45%
825
22%
4317
19%
814
63%
814
28%
2029
February1st to 10thNight
36%
760
30%
2470
13%
760
58%
760
45%
1178
February11th to 20thNight
35%
743
29%
2248
12%
740
54%
740
42%
1155
February21st to endNight
33%
628
36%
1884
12%
628
57%
628
48%
932
March1st to 10thNight
39%
752
33%
3608
12%
744
55%
744
32%
1554
March11th to 20thNight
46%
749
24%
3456
14%
740
56%
740
25%
1939
March21st to endNight
36%
709
20%
3496
11%
695
54%
695
27%
1584
April1st to 10thNight
37%
570
29%
1900
15%
570
56%
570
39%
927
April11th to 20thNight
36%
563
23%
1877
14%
563
51%
563
30%
1048
April21st to endNight
40%
570
22%
1900
13%
570
55%
570
31%
1071
May1st to 10thNight
41%
569
26%
2908
16%
559
51%
559
21%
1412
May11th to 20thNight
52%
549
13%
2450
11%
541
56%
541
20%
1370
May21st to endNight
47%
605
15%
2731
11%
593
56%
593
28%
1229
June1st to 10thNight
64%
570
23%
1520
16%
570
69%
570
43%
850
June11th to 20thNight
61%
570
25%
1520
19%
570
65%
570
50%
798
June21st to endNight
69%
570
23%
1520
20%
570
70%
570
44%
852
July1st to 10thNight
67%
543
25%
2169
17%
535
69%
535
25%
1167
July11th to 20thNight
74%
538
21%
2134
20%
533
75%
533
32%
1070
July21st to endNight
72%
607
14%
2398
12%
569
74%
569
21%
1290
August1st to 10thNight
68%
557
11%
2684
12%
545
69%
545
16%
1670
August11th to 20thNight
72%
551
15%
2897
24%
544
75%
544
24%
1447
August21st to endNight
70%
611
19%
3248
25%
605
72%
605
22%
1652
September1st to 10thNight
68%
570
28%
1900
27%
570
73%
570
34%
1037
September11th to 20thNight
67%
570
32%
1901
28%
570
73%
570
42%
959
September21st to endNight
55%
579
30%
2099
24%
579
66%
579
40%
1014
October1st to 10thNight
56%
748
42%
3370
17%
740
66%
740
35%
1348
October11th to 20thNight
58%
753
27%
3479
19%
740
71%
740
38%
1541
October21st to endNight
51%
833
43%
3793
19%
817
64%
817
44%
1318
November1st to 10thNight
48%
975
35%
2535
16%
975
59%
975
55%
1307
November11th to 20thNight
45%
1000
37%
2600
16%
1000
57%
1000
55%
1286
November21st to endNight
48%
986
33%
2653
17%
986
59%
986
49%
1363
December1st to 10thNight
41%
950
29%
2660
14%
950
53%
950
49%
1321
December11th to 20thNight
40%
948
29%
3120
14%
948
53%
948
42%
1528
December21st to endNight
34%
1030
20%
4669
12%
1026
50%
1026
27%
2201

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
35%26%445%46%9%53%
105363
Night
25%25%43446%8%58%
102902
TransparencyDay
25%7%12%23%23%9%
105111
Night
22%7%13%27%24%7%
102744
SeeingDay
9%14%28%29%16%4
15579
Night
5%8%31%41%14%1
25644

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
325%33445%9%61%
2538
11th to 20thDay
1217%44346%9%59%
2732
21st to endDay
5%37%5%4446%8%55%
3146
February1st to 10thDay
427%43445%8%59%
1710
11th to 20thDay
21334346%8%65%
1816
21st to endDay
426%34435%8%62%
1570
March1st to 10thDay
15%25%33335%7%62%
3152
11th to 20thDay
210%47%5%45%46%8%45%
3490
21st to endDay
15%25%44446%9%56%
4027
April1st to 10thDay
26%15%445%5%6%9%54%
2280
11th to 20thDay
48%37%445%46%8%48%
2251
21st to endDay
39%37%5%45%46%9%45%
2280
May1st to 10thDay
5%7%26%445%46%9%46%
3914
11th to 20thDay
5%7%27%6%5%6%5%8%10%40%
4379
21st to endDay
242444447%10%53%
4825
June1st to 10thDay
3425%5%5%6%5%8%11%47%
2660
11th to 20thDay
4425%445%46%8%54%
2660
21st to endDay
3425%5%5%6%6%8%10%47%
2660
July1st to 10thDay
3425%45%5%5%7%9%51%
4430
11th to 20thDay
5%426%5%5%7%5%8%11%41%
4430
21st to endDay
6%427%5%5%7%5%7%8%44%
4584
August1st to 10thDay
7%5%28%7%6%6%5%7%11%35%
4092
11th to 20thDay
4426%45%6%6%8%9%46%
3731
21st to endDay
4426%5%6%6%5%8%10%44%
4180
September1st to 10thDay
6%426%45%5%46%8%50%
2280
11th to 20thDay
5%416%44435%6%57%
2277
21st to endDay
4415%333346%63%
2076
October1st to 10thDay
2313323245%72%
3170
11th to 20thDay
2424345%46%9%58%
3150
21st to endDay
2313323246%71%
3390
November1st to 10thDay
142332236%6%69%
1763
11th to 20thDay
31332235%7%70%
1800
21st to endDay
426%33435%9%62%
1680
December1st to 10thDay
132433435%9%63%
1520
11th to 20thDay
315%33437%12%59%
1926
21st to endDay
1316%43447%10%58%
2794
January1st to 10thNight
327%435%36%9%57%
4417
11th to 20thNight
111334445%8%67%
4269
21st to endNight
5%36%44435%8%57%
4521
February1st to 10thNight
336%423348%64%
2470
11th to 20thNight
1426%333347%63%
2248
21st to endNight
426%33335%7%64%
1884
March1st to 10thNight
17%35%33335%7%61%
3708
11th to 20thNight
212%47%33446%7%48%
3490
21st to endNight
16%26%43446%9%55%
3619
April1st to 10thNight
15%15%43335%8%62%
1900
11th to 20thNight
310%37%335%35%7%52%
1877
21st to endNight
310%27%43336%7%52%
1900
May1st to 10thNight
5%9%26%44335%7%52%
3056
11th to 20thNight
6%10%26%34447%8%45%
2522
21st to endNight
46%25%33435%7%57%
2762
June1st to 10thNight
332433448%8%58%
1520
11th to 20thNight
321333347%8%62%
1520
21st to endNight
2315%4445%8%9%54%
1520
July1st to 10thNight
4426%4445%7%8%53%
2540
11th to 20thNight
23244445%8%12%51%
2540
21st to endNight
3425%45%5%5%9%10%48%
2974
August1st to 10thNight
5%6%38%6%5%6%5%9%11%36%
2847
11th to 20thNight
231445%5%5%8%11%50%
3105
21st to endNight
3425%46%6%6%9%12%45%
3487
September1st to 10thNight
5%425%45%5%5%7%8%50%
1900
11th to 20thNight
5%42433435%8%58%
1901
21st to endNight
5%5%24433346%61%
2099
October1st to 10thNight
3313333245%70%
3800
11th to 20thNight
26%14333347%64%
3778
21st to endNight
2313223246%73%
4136
November1st to 10thNight
1314333246%69%
2535
11th to 20thNight
31322235%7%72%
2600
21st to endNight
15%2433336%7%65%
2653
December1st to 10thNight
122432335%9%65%
2660
11th to 20thNight
142333447%9%60%
3271
21st to endNight
15%26%44436%8%57%
4873

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
16%7%16%31%24%6%
2539
11th to 20thDay
19%7%18%28%23%5%
2732
21st to endDay
24%7%12%32%20%6%
3146
February1st to 10thDay
22%5%16%28%20%8%
1710
11th to 20thDay
17%5%12%29%31%7%
1826
21st to endDay
21%49%25%28%12%
1570
March1st to 10thDay
21%5%8%23%33%11%
3152
11th to 20thDay
33%9%10%30%16%3
3490
21st to endDay
22%7%13%36%19%3
4027
April1st to 10thDay
25%7%13%25%21%10%
2280
11th to 20thDay
32%8%10%24%21%6%
2254
21st to endDay
32%9%10%26%19%3
2280
May1st to 10thDay
32%7%11%21%20%9%
3914
11th to 20thDay
34%11%13%22%18%3
4383
21st to endDay
22%8%11%22%28%8%
4825
June1st to 10thDay
27%9%15%20%20%8%
2660
11th to 20thDay
26%7%9%18%23%17%
2660
21st to endDay
28%8%11%22%20%12%
2660
July1st to 10thDay
24%8%9%15%20%24%
4361
11th to 20thDay
31%8%12%25%16%7%
4355
21st to endDay
33%8%13%17%14%15%
4439
August1st to 10thDay
39%10%18%17%12%4
4078
11th to 20thDay
30%9%14%14%20%12%
3767
21st to endDay
31%8%13%17%23%7%
4179
September1st to 10thDay
29%7%10%18%24%12%
2280
11th to 20thDay
26%6%10%19%28%12%
2277
21st to endDay
22%47%23%35%9%
2076
October1st to 10thDay
15%5%6%16%37%21%
3170
11th to 20thDay
22%5%8%30%28%7%
3150
21st to endDay
15%36%24%43%9%
3390
November1st to 10thDay
16%410%23%34%13%
1763
11th to 20thDay
14%5%6%35%30%9%
1800
21st to endDay
20%5%10%26%29%11%
1680
December1st to 10thDay
18%6%16%29%25%7%
1520
11th to 20thDay
17%7%14%32%26%4
1924
21st to endDay
19%8%12%26%26%9%
2794
January1st to 10thNight
21%7%12%30%25%3
4417
11th to 20thNight
13%6%15%34%25%7%
4269
21st to endNight
23%8%14%30%22%4
4521
February1st to 10thNight
20%414%33%23%6%
2470
11th to 20thNight
22%5%11%30%26%6%
2248
21st to endNight
19%48%28%30%11%
1884
March1st to 10thNight
23%410%24%35%4
3708
11th to 20thNight
32%9%10%30%18%2
3490
21st to endNight
23%8%16%34%18%2
3619
April1st to 10thNight
21%6%13%29%25%6%
1900
11th to 20thNight
31%6%10%29%20%4
1877
21st to endNight
31%6%14%27%19%3
1900
May1st to 10thNight
28%7%13%24%19%9%
3056
11th to 20thNight
31%11%13%27%15%2
2523
21st to endNight
24%7%13%23%27%6%
2762
June1st to 10thNight
21%10%21%23%15%10%
1520
11th to 20thNight
17%8%14%22%23%17%
1520
21st to endNight
24%8%13%24%21%11%
1520
July1st to 10thNight
27%8%11%19%22%14%
2500
11th to 20thNight
21%8%20%34%12%5%
2492
21st to endNight
25%11%20%23%8%14%
2881
August1st to 10thNight
38%11%21%16%10%3
2838
11th to 20thNight
26%9%24%18%18%6%
3135
21st to endNight
27%10%21%21%19%2
3487
September1st to 10thNight
28%7%13%22%21%9%
1900
11th to 20thNight
22%7%12%22%24%13%
1901
21st to endNight
24%49%26%29%7%
2099
October1st to 10thNight
17%5%8%24%33%13%
3800
11th to 20thNight
21%411%32%24%7%
3778
21st to endNight
14%37%29%38%10%
4136
November1st to 10thNight
16%5%10%26%32%11%
2535
11th to 20thNight
14%5%8%34%30%10%
2600
21st to endNight
19%410%28%28%11%
2653
December1st to 10thNight
17%5%17%29%24%7%
2660
11th to 20thNight
17%7%15%28%29%4
3272
21st to endNight
22%9%11%24%28%7%
4873

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
419%26%36%15%
270
11th to 20thDay
10%14%36%32%6%1
270
21st to endDay
212%37%34%11%3
297
February1st to 10thDay
230%39%24%41
270
11th to 20thDay
5%24%39%26%41
270
21st to endDay
10%26%39%19%5%1
225
March1st to 10thDay
7%22%33%28%10%
279
11th to 20thDay
9%22%36%22%10%1
460
21st to endDay
11%28%37%19%4
506
April1st to 10thDay
13%23%37%21%6%1
460
11th to 20thDay
18%26%33%17%42
452
21st to endDay
13%24%37%18%6%2
460
May1st to 10thDay
14%20%36%21%8%2
525
11th to 20thDay
10%14%25%33%14%3
675
21st to endDay
9%15%25%29%19%2
734
June1st to 10thDay
5%11%25%31%23%5%
680
11th to 20thDay
8%10%28%33%16%4
680
21st to endDay
5%7%28%33%21%5%
680
July1st to 10thDay
8%5%16%34%29%8%
671
11th to 20thDay
10%213%34%32%9%
668
21st to endDay
12%5%13%31%32%8%
609
August1st to 10thDay
12%421%32%23%7%
487
11th to 20thDay
8%5%22%36%21%9%
477
21st to endDay
10%5%26%31%21%7%
539
September1st to 10thDay
9%7%22%31%24%7%
490
11th to 20thDay
6%10%31%33%16%4
487
21st to endDay
6%10%20%32%22%11%
300
October1st to 10thDay
5%14%23%26%21%11%
300
11th to 20thDay
6%17%24%28%21%3
300
21st to endDay
11%13%31%28%13%3
330
November1st to 10thDay
9%15%30%31%10%4
300
11th to 20thDay
5%18%32%32%10%2
300
21st to endDay
413%40%31%10%1
291
December1st to 10thDay
8%14%37%30%9%2
270
11th to 20thDay
5%16%39%33%8%1
270
21st to endDay
9%19%38%23%8%2
297
January1st to 10thNight
212%38%39%8%1
950
11th to 20thNight
213%41%35%8%1
854
21st to endNight
17%38%45%8%1
836
February1st to 10thNight
18%48%38%6%
760
11th to 20thNight
210%47%36%5%
744
21st to endNight
29%50%35%3
628
March1st to 10thNight
311%41%38%6%
760
11th to 20thNight
5%6%36%44%8%
760
21st to endNight
411%43%38%4
717
April1st to 10thNight
6%14%38%39%4
570
11th to 20thNight
11%11%36%35%7%1
563
21st to endNight
9%10%36%37%8%
570
May1st to 10thNight
11%9%32%39%9%
570
11th to 20thNight
9%5%23%47%14%2
561
21st to endNight
9%9%26%38%16%2
617
June1st to 10thNight
4421%47%21%3
570
11th to 20thNight
5%326%50%14%2
570
21st to endNight
4216%49%28%2
570
July1st to 10thNight
7%39%40%38%3
555
11th to 20thNight
5%28%41%40%4
552
21st to endNight
8%2437%45%4
624
August1st to 10thNight
9%37%43%35%4
567
11th to 20thNight
6%29%49%31%3
564
21st to endNight
7%29%46%34%2
627
September1st to 10thNight
6%212%47%27%5%
570
11th to 20thNight
8%216%49%23%2
570
21st to endNight
7%426%43%19%2
579
October1st to 10thNight
6%7%25%45%15%2
760
11th to 20thNight
35%31%48%13%1
760
21st to endNight
5%6%33%42%12%2
840
November1st to 10thNight
37%36%42%10%1
975
11th to 20thNight
212%38%40%7%1
1000
21st to endNight
410%33%45%8%1
986
December1st to 10thNight
211%41%39%7%
950
11th to 20thNight
312%40%39%7%
950
21st to endNight
315%40%36%6%
1045
Page generated at 2024-11-24 22:22:21. Version ac07

Copyright © 2024 Attilla Danko.


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