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 2005-11-05 to 2017-09-23.

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
51%
15925
27%
46943
16%
15880
62%
15880
40%
25208

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 15thNight
42%
900
31%
2506
15%
895
57%
895
48%
1230
January16th to endNight
45%
768
35%
2496
21%
768
63%
768
47%
1153
February1st to 15thNight
38%
702
26%
2251
12%
699
55%
699
41%
1128
February16th to endNight
36%
632
35%
1894
14%
632
57%
632
46%
951
March1st to 15thNight
42%
720
29%
2091
13%
720
56%
720
45%
1091
March16th to endNight
42%
693
29%
2037
13%
693
56%
693
38%
1112
April1st to 15thNight
39%
539
25%
1798
14%
539
55%
539
36%
917
April16th to endNight
37%
540
22%
1800
13%
540
52%
540
28%
1047
May1st to 15thNight
46%
540
19%
1644
14%
540
53%
540
27%
1020
May16th to endNight
51%
562
17%
1498
10%
561
58%
561
34%
925
June1st to 15thNight
64%
540
22%
1440
15%
540
70%
540
47%
770
June16th to endNight
72%
540
25%
1440
20%
540
75%
540
51%
759
July1st to 15thNight
69%
510
15%
1360
14%
510
70%
510
31%
879
July16th to endNight
72%
564
15%
1488
14%
531
73%
531
29%
937
August1st to 15thNight
72%
539
15%
1667
15%
536
73%
536
29%
1014
August16th to endNight
72%
573
23%
1910
24%
573
74%
573
30%
1113
September1st to 15thNight
65%
540
24%
1800
22%
540
71%
540
32%
1026
September16th to endNight
61%
521
33%
1849
26%
521
72%
521
42%
888
October1st to 15thNight
58%
660
31%
1980
18%
660
67%
660
44%
1029
October16th to endNight
58%
707
34%
2115
19%
707
68%
707
48%
1062
November1st to 15thNight
53%
875
34%
2275
17%
875
62%
875
53%
1175
November16th to endNight
50%
900
36%
2396
19%
900
61%
900
53%
1195
December1st to 15thNight
39%
900
25%
2520
11%
900
51%
900
45%
1286
December16th to endNight
37%
960
27%
2688
12%
960
51%
960
37%
1501

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
3425%4345%5%8%51%
47976
Night
242332345%8%58%
47122
TransparencyDay
29%6%12%24%20%6%
47657
Night
23%6%14%28%20%5%
46943
SeeingDay
10%13%26%28%16%5%
5827
Night
48%29%40%15%1
15928

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 15thDay
323323448%63%
1444
16th to endDay
324322348%62%
1728
February1st to 15thDay
425%4235%5%9%57%
1609
16th to endDay
3243245%48%61%
1580
March1st to 15thDay
142443446%9%54%
1866
16th to endDay
27%2443445%8%51%
2187
April1st to 15thDay
26%24425%5%5%9%50%
2150
16th to endDay
410%37%5%35%5%5%7%42%
2160
May1st to 15thDay
7%6%37%6%35%5%6%9%38%
2304
16th to endDay
46%25%6%45%5%6%9%42%
2616
June1st to 15thDay
3424435%5%7%9%48%
2520
16th to endDay
3213435%5%7%8%53%
2520
July1st to 15thDay
6%425%6%37%7%7%9%37%
2520
16th to endDay
7%5%26%6%46%7%7%8%35%
2576
August1st to 15thDay
8%427%6%45%6%6%8%37%
2283
16th to endDay
7%3245%45%5%6%8%45%
2292
September1st to 15thDay
7%425%5%35%5%5%7%46%
2160
16th to endDay
3315%5%23345%62%
1943
October1st to 15thDay
33135%24348%58%
1650
16th to endDay
3413423345%63%
1746
November1st to 15thDay
32331236%7%66%
1583
16th to endDay
214213248%66%
1563
December1st to 15thDay
425%32335%8%60%
1440
16th to endDay
131432346%11%57%
1536
January1st to 15thNight
21231335%8%66%
2506
16th to endNight
313322337%68%
2496
February1st to 15thNight
325%423348%61%
2241
16th to endNight
423313348%63%
1894
March1st to 15thNight
1423323448%60%
2091
16th to endNight
25%24423347%59%
2037
April1st to 15thNight
16%23413448%59%
1798
16th to endNight
5%8%26%43335%6%49%
1800
May1st to 15thNight
6%9%25%43436%7%44%
1643
16th to endNight
6%5%145%245%6%9%49%
1497
June1st to 15thNight
221231445%9%62%
1440
16th to endNight
12232447%9%61%
1440
July1st to 15thNight
5%335%6%447%8%10%41%
1440
16th to endNight
5%3345%36%6%9%11%38%
1590
August1st to 15thNight
5%3245%35%7%7%8%46%
1676
16th to endNight
5%5%244346%7%9%46%
1910
September1st to 15thNight
6%424425%6%7%9%46%
1800
16th to endNight
3313323346%62%
1849
October1st to 15thNight
4212223446%64%
1980
16th to endNight
231332345%6%62%
2115
November1st to 15thNight
21231335%7%67%
2275
16th to endNight
1322213347%68%
2396
December1st to 15thNight
31332345%9%62%
2520
16th to endNight
325%42435%8%57%
2688

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 15thDay
19%5%20%32%18%4
1445
16th to endDay
20%415%33%20%5%
1728
February1st to 15thDay
23%5%18%32%17%3
1610
16th to endDay
21%5%12%31%24%4
1580
March1st to 15thDay
25%5%11%28%23%4
1866
16th to endDay
29%6%11%28%19%4
2187
April1st to 15thDay
29%7%12%27%17%6%
2150
16th to endDay
39%7%10%22%17%3
2160
May1st to 15thDay
41%7%13%20%16%
2304
16th to endDay
36%8%14%21%14%5%
2620
June1st to 15thDay
29%7%12%17%21%11%
2520
16th to endDay
25%6%9%21%24%11%
2520
July1st to 15thDay
36%9%13%16%15%8%
2371
16th to endDay
41%9%17%18%10%3
2415
August1st to 15thDay
41%9%14%14%13%6%
2268
16th to endDay
34%8%11%24%17%3
2292
September1st to 15thDay
33%6%11%20%19%8%
2160
16th to endDay
24%48%24%32%6%
1943
October1st to 15thDay
24%5%9%24%28%6%
1650
16th to endDay
22%38%27%30%6%
1746
November1st to 15thDay
17%411%26%27%12%
1583
16th to endDay
16%38%31%30%8%
1563
December1st to 15thDay
22%5%18%31%18%3
1440
16th to endDay
21%7%17%28%18%5%
1536
January1st to 15thNight
16%420%32%22%3
2506
16th to endNight
16%413%32%25%6%
2496
February1st to 15thNight
22%416%37%15%3
2251
16th to endNight
19%410%33%25%6%
1894
March1st to 15thNight
21%412%32%25%3
2091
16th to endNight
26%411%32%21%3
2037
April1st to 15thNight
24%5%13%31%20%5%
1798
16th to endNight
35%5%13%26%16%3
1800
May1st to 15thNight
37%6%13%24%15%2
1644
16th to endNight
30%8%17%23%14%5%
1498
June1st to 15thNight
18%7%17%22%17%14%
1440
16th to endNight
18%7%13%24%22%13%
1440
July1st to 15thNight
35%9%16%18%13%7%
1360
16th to endNight
33%10%23%20%8%2
1488
August1st to 15thNight
32%10%19%18%14%5%
1667
16th to endNight
31%9%16%24%15%2
1910
September1st to 15thNight
30%7%15%21%15%8%
1800
16th to endNight
21%5%11%30%26%4
1849
October1st to 15thNight
20%6%10%25%28%7%
1980
16th to endNight
20%410%27%30%5%
2115
November1st to 15thNight
16%5%11%28%27%11%
2275
16th to endNight
16%39%33%28%8%
2396
December1st to 15thNight
18%5%21%31%19%3
2520
16th to endNight
24%7%16%28%19%4
2688

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 15thDay
7%17%14%37%22%
90
16th to endDay
27%28%48%12%1
96
February1st to 15thDay
225%33%35%3
90
16th to endDay
127%30%23%13%3
81
March1st to 15thDay
6%22%35%25%9%
156
16th to endDay
12%28%37%16%4
288
April1st to 15thDay
10%30%34%18%42
269
16th to endDay
21%31%30%12%21
270
May1st to 15thDay
10%16%32%28%9%2
387
16th to endDay
10%13%27%26%17%3
517
June1st to 15thDay
6%12%25%28%21%5%
495
16th to endDay
5%5%24%33%24%7%
495
July1st to 15thDay
10%316%30%29%8%
475
16th to endDay
15%212%30%30%8%
435
August1st to 15thDay
17%5%22%33%14%7%
315
16th to endDay
13%325%34%17%6%
332
September1st to 15thDay
11%10%30%27%14%4
315
16th to endDay
412%34%24%15%8%
169
October1st to 15thDay
48%22%28%24%11%
90
16th to endDay
11%11%26%23%20%6%
96
November1st to 15thDay
37%21%30%25%12%
90
16th to endDay
220%44%26%6%
90
December1st to 15thDay
323%43%26%3
90
16th to endDay
116%36%40%23
96
January1st to 15thNight
213%36%36%9%1
900
16th to endNight
110%36%41%8%
768
February1st to 15thNight
18%44%40%5%
704
16th to endNight
29%46%37%4
632
March1st to 15thNight
38%40%39%8%
720
16th to endNight
5%11%36%40%6%
693
April1st to 15thNight
6%14%35%38%5%
539
16th to endNight
11%10%35%33%8%
540
May1st to 15thNight
11%7%28%40%11%
540
16th to endNight
8%7%24%39%16%2
563
June1st to 15thNight
4322%48%18%2
540
16th to endNight
2117%45%29%2
540
July1st to 15thNight
7%16%39%39%4
510
16th to endNight
8%15%33%47%4
564
August1st to 15thNight
8%16%41%38%3
539
16th to endNight
8%17%42%36%3
573
September1st to 15thNight
9%113%42%28%5%
540
16th to endNight
4322%44%22%2
521
October1st to 15thNight
5%6%26%42%16%2
660
16th to endNight
45%27%44%16%2
707
November1st to 15thNight
210%30%44%11%1
875
16th to endNight
310%31%43%9%
900
December1st to 15thNight
213%40%37%5%
900
16th to endNight
214%39%36%7%
960
Page generated at 2017-09-24 07:15:56. Version ac04

Copyright 2017 A. Danko


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