Jeff Busby Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Jeff Busby Campground 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
47%
23779
24%
74422
17%
23721
55%
23721
29%
44975

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
24%
950
23%
2534
8%
946
37%
946
27%
1647
January11th to 20thNight
26%
920
23%
2392
8%
920
36%
920
21%
1678
January21st to endNight
20%
881
27%
2465
8%
881
35%
881
25%
1605
February1st to 10thNight
25%
720
23%
2160
9%
720
37%
720
22%
1425
February11th to 20thNight
24%
703
21%
2099
8%
700
33%
700
22%
1384
February21st to endNight
20%
592
23%
1776
7%
592
33%
592
19%
1216
March1st to 10thNight
31%
720
22%
2160
12%
720
40%
720
25%
1357
March11th to 20thNight
30%
588
19%
2028
11%
588
39%
588
21%
1299
March21st to endNight
33%
594
24%
2016
13%
594
47%
594
25%
1212
April1st to 10thNight
36%
540
27%
1800
17%
540
50%
540
27%
1061
April11th to 20thNight
39%
533
27%
1775
19%
533
53%
533
28%
1027
April21st to endNight
40%
540
27%
1800
19%
540
54%
540
32%
1008
May1st to 10thNight
50%
540
23%
1800
18%
540
61%
540
34%
988
May11th to 20thNight
54%
531
21%
1664
16%
531
61%
531
31%
994
May21st to endNight
66%
582
23%
1744
21%
582
70%
582
36%
1035
June1st to 10thNight
68%
540
20%
1510
18%
540
70%
540
33%
956
June11th to 20thNight
76%
540
26%
1440
21%
540
78%
540
47%
802
June21st to endNight
72%
540
23%
1440
20%
540
74%
540
42%
831
July1st to 10thNight
76%
525
18%
1400
17%
525
76%
525
36%
876
July11th to 20thNight
78%
522
18%
1528
18%
522
80%
522
36%
904
July21st to endNight
78%
591
17%
1796
21%
558
79%
558
34%
1048
August1st to 10thNight
82%
537
18%
1778
22%
534
83%
534
36%
983
August11th to 20thNight
78%
534
19%
1776
23%
534
79%
534
31%
1063
August21st to endNight
71%
594
22%
1980
26%
594
71%
594
28%
1198
September1st to 10thNight
67%
540
27%
1800
29%
540
70%
540
33%
1014
September11th to 20thNight
66%
616
25%
1876
23%
616
68%
616
32%
1134
September21st to endNight
69%
720
33%
1980
25%
720
72%
720
42%
1143
October1st to 10thNight
65%
720
35%
2002
27%
720
70%
720
48%
1068
October11th to 20thNight
53%
720
32%
2160
23%
720
62%
720
36%
1227
October21st to endNight
47%
792
32%
2376
24%
792
55%
792
34%
1385
November1st to 10thNight
52%
740
30%
2356
25%
740
61%
740
36%
1287
November11th to 20thNight
43%
760
29%
2470
21%
760
55%
760
33%
1365
November21st to endNight
40%
760
26%
2470
18%
760
51%
760
29%
1455
December1st to 10thNight
32%
760
25%
2470
15%
760
45%
760
23%
1576
December11th to 20thNight
32%
759
25%
2907
14%
758
45%
758
21%
1748
December21st to endNight
26%
1035
13%
4694
8%
1021
36%
1021
13%
2976

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
12%6%35%5%35%5%5%7%43%
74812
Night
12%6%25%43445%7%47%
74937
TransparencyDay
39%6%10%20%19%5%
74538
Night
36%5%10%21%21%7%
74733
SeeingDay
15%9%23%25%20%9%
13945
Night
15%8%24%29%20%4
23787

By Month

Percentage Cloud Cover SE (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
18%8%25%433446%45%
1626
11th to 20thDay
18%10%35%4245%5%5%39%
1647
21st to endDay
15%7%35%434445%48%
1887
February1st to 10thDay
16%8%36%5%245%5%6%41%
1800
11th to 20thDay
23%7%46%434345%39%
1748
21st to endDay
20%9%36%6%33335%39%
1480
March1st to 10thDay
15%8%36%6%35%446%41%
1800
11th to 20thDay
15%7%36%6%35%5%6%7%37%
1946
21st to endDay
13%7%36%5%45%5%5%6%41%
2340
April1st to 10thDay
12%5%25%435%45%8%47%
2160
11th to 20thDay
14%7%245%34446%45%
2134
21st to endDay
9%5%346%35%45%7%49%
2160
May1st to 10thDay
14%435%5%35%447%46%
2160
11th to 20thDay
10%5%25%7%45%6%7%9%41%
2224
21st to endDay
8%5%25%7%47%7%6%8%40%
2531
June1st to 10thDay
8%5%26%8%47%6%6%9%38%
2444
11th to 20thDay
4325%6%46%6%7%10%44%
2520
21st to endDay
6%425%6%5%7%6%6%9%43%
2520
July1st to 10thDay
8%6%36%8%5%8%8%7%9%33%
2520
11th to 20thDay
8%5%36%8%5%7%7%7%10%33%
2376
21st to endDay
7%5%26%6%5%8%9%8%10%34%
2412
August1st to 10thDay
5%425%7%5%8%8%9%9%38%
2148
11th to 20thDay
8%6%37%8%5%7%7%8%9%33%
2125
21st to endDay
13%5%245%46%7%6%11%38%
2376
September1st to 10thDay
8%5%36%6%46%5%6%8%44%
2160
11th to 20thDay
11%5%37%5%35%45%7%44%
2066
21st to endDay
11%5%2343345%7%52%
1980
October1st to 10thDay
7%5%25%423445%58%
1954
11th to 20thDay
11%4245%2445%7%54%
1800
21st to endDay
14%5%25%433445%53%
1980
November1st to 10thDay
10%5%24324336%58%
1722
11th to 20thDay
13%6%24423335%54%
1710
21st to endDay
15%7%35%434446%45%
1710
December1st to 10thDay
17%8%445%34446%40%
1710
11th to 20thDay
15%9%36%434445%43%
2153
21st to endDay
13%8%37%5%3445%6%41%
2783
January1st to 10thNight
19%6%35%323447%45%
2534
11th to 20thNight
16%10%46%5%3333442%
2392
21st to endNight
17%8%35%5%33435%45%
2465
February1st to 10thNight
17%9%36%5%24446%41%
2160
11th to 20thNight
21%6%25%43334444%
2098
21st to endNight
20%8%36%5%34447%38%
1776
March1st to 10thNight
15%7%24425%45%7%44%
2160
11th to 20thNight
15%7%36%5%3445%7%40%
2028
21st to endNight
13%6%35%5%345%5%7%44%
2016
April1st to 10thNight
12%6%245%245%5%7%49%
1800
11th to 20thNight
13%5%25%425%35%8%49%
1775
21st to endNight
9%425%5%3445%8%50%
1800
May1st to 10thNight
10%42432445%8%52%
1800
11th to 20thNight
9%5%25%5%35%5%7%9%46%
1664
21st to endNight
6%426%445%6%7%10%47%
1744
June1st to 10thNight
5%425%7%46%6%6%9%46%
1510
11th to 20thNight
3324435%5%7%11%54%
1440
21st to endNight
5%315%5%345%7%11%51%
1440
July1st to 10thNight
3435%6%36%7%8%12%44%
1440
11th to 20thNight
5%424445%6%8%11%47%
1579
21st to endNight
4325%5%46%5%9%13%44%
1902
August1st to 10thNight
32245%46%6%8%12%48%
1790
11th to 20thNight
5%425%6%35%7%7%13%44%
1776
21st to endNight
9%4246%46%5%7%8%46%
1980
September1st to 10thNight
9%5%25%5%2445%8%51%
1800
11th to 20thNight
9%5%25%5%346%6%8%47%
1876
21st to endNight
8%4134345%5%7%55%
1980
October1st to 10thNight
7%322423446%63%
2002
11th to 20thNight
12%6%2432335%7%54%
2160
21st to endNight
16%7%2332333455%
2376
November1st to 10thNight
11%423324345%58%
2356
11th to 20thNight
12%5%2442335%6%54%
2470
21st to endNight
15%5%24434346%49%
2470
December1st to 10thNight
18%7%35%434446%43%
2470
11th to 20thNight
14%7%36%424345%48%
3042
21st to endNight
15%9%36%5%35%5%6%6%35%
4866

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
43%37%21%21%5%
1627
11th to 20thDay
47%45%18%20%5%
1647
21st to endDay
39%45%21%26%5%
1887
February1st to 10thDay
44%48%20%18%7%
1800
11th to 20thDay
50%3418%17%8%
1758
21st to endDay
50%35%14%20%8%
1480
March1st to 10thDay
45%46%16%18%11%
1800
11th to 20thDay
46%6%9%16%19%4
1946
21st to endDay
43%5%9%23%18%3
2340
April1st to 10thDay
37%410%22%21%7%
2160
11th to 20thDay
40%46%19%25%6%
2134
21st to endDay
35%410%24%25%2
2160
May1st to 10thDay
39%49%24%20%4
2160
11th to 20thDay
38%7%12%25%16%1
2228
21st to endDay
40%8%12%24%15%2
2531
June1st to 10thDay
41%8%14%20%17%1
2444
11th to 20thDay
33%8%15%24%18%3
2520
21st to endDay
35%8%15%22%16%3
2520
July1st to 10thDay
42%10%18%20%8%3
2451
11th to 20thDay
42%10%20%18%8%2
2305
21st to endDay
40%12%19%20%8%1
2278
August1st to 10thDay
36%11%17%27%9%1
2136
11th to 20thDay
43%11%14%18%11%3
2125
21st to endDay
38%9%17%20%11%5%
2376
September1st to 10thDay
37%7%12%21%19%5%
2160
11th to 20thDay
39%6%11%16%22%7%
2066
21st to endDay
32%5%9%24%21%9%
1980
October1st to 10thDay
28%5%10%24%24%10%
1954
11th to 20thDay
31%5%5%20%30%9%
1800
21st to endDay
35%35%19%28%10%
1980
November1st to 10thDay
31%36%21%29%11%
1722
11th to 20thDay
35%26%19%25%12%
1710
21st to endDay
41%45%17%24%8%
1710
December1st to 10thDay
46%5%8%16%19%7%
1710
11th to 20thDay
44%36%18%23%6%
2150
21st to endDay
43%47%19%24%3
2783
January1st to 10thNight
40%47%19%26%5%
2534
11th to 20thNight
48%35%17%20%6%
2392
21st to endNight
44%35%18%25%6%
2465
February1st to 10thNight
45%36%18%19%8%
2160
11th to 20thNight
46%3419%18%9%
2099
21st to endNight
49%46%14%18%10%
1776
March1st to 10thNight
40%48%17%20%12%
2160
11th to 20thNight
44%5%10%16%18%7%
2028
21st to endNight
39%48%23%20%6%
2016
April1st to 10thNight
35%5%9%22%19%9%
1800
11th to 20thNight
36%47%21%25%9%
1775
21st to endNight
33%410%25%24%5%
1800
May1st to 10thNight
30%5%11%25%23%5%
1800
11th to 20thNight
34%6%15%24%19%2
1665
21st to endNight
30%8%15%27%18%3
1745
June1st to 10thNight
34%7%14%23%19%2
1510
11th to 20thNight
22%7%16%31%17%6%
1440
21st to endNight
26%7%19%24%21%3
1440
July1st to 10thNight
28%12%20%26%11%4
1400
11th to 20thNight
27%11%25%26%9%3
1528
21st to endNight
28%10%24%26%10%2
1796
August1st to 10thNight
25%10%22%31%11%1
1778
11th to 20thNight
30%10%21%23%11%4
1776
21st to endNight
34%9%17%22%12%5%
1980
September1st to 10thNight
31%6%13%23%22%5%
1800
11th to 20thNight
33%8%11%17%22%8%
1876
21st to endNight
28%6%8%25%23%10%
1980
October1st to 10thNight
23%49%24%26%14%
2002
11th to 20thNight
32%46%19%29%11%
2160
21st to endNight
36%25%17%29%13%
2376
November1st to 10thNight
30%47%19%28%13%
2356
11th to 20thNight
32%37%18%26%13%
2470
21st to endNight
37%37%20%22%10%
2470
December1st to 10thNight
44%48%18%21%6%
2470
11th to 20thNight
40%37%17%27%6%
3044
21st to endNight
47%5%6%16%23%3
4866

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
25%23%34%16%3
270
11th to 20thDay
26%20%35%13%42
249
21st to endDay
23%27%34%13%21
264
February1st to 10thDay
24%20%37%14%5%
240
11th to 20thDay
39%19%31%10%2
240
21st to endDay
35%18%36%9%2
198
March1st to 10thDay
22%24%34%17%3
240
11th to 20thDay
24%26%37%10%3
240
21st to endDay
22%17%35%19%8%
426
April1st to 10thDay
19%16%33%22%9%1
420
11th to 20thDay
23%14%30%20%11%2
412
21st to endDay
17%14%30%26%13%1
420
May1st to 10thDay
18%9%26%32%13%3
423
11th to 20thDay
11%8%26%32%15%8%
447
21st to endDay
9%424%29%21%13%
485
June1st to 10thDay
10%5%18%29%27%11%
554
11th to 20thDay
5%318%31%31%12%
630
21st to endDay
9%315%34%26%14%
630
July1st to 10thDay
7%212%31%32%16%
621
11th to 20thDay
7%29%24%37%21%
618
21st to endDay
6%210%26%37%19%
550
August1st to 10thDay
5%112%25%33%23%
446
11th to 20thDay
10%110%27%34%18%
439
21st to endDay
15%27%24%31%20%
495
September1st to 10thDay
9%210%32%36%12%
450
11th to 20thDay
10%312%26%33%16%
450
21st to endDay
13%214%30%30%11%
450
October1st to 10thDay
9%423%30%25%9%
424
11th to 20thDay
10%12%34%30%11%3
270
21st to endDay
21%12%30%25%10%2
297
November1st to 10thDay
17%8%29%30%13%4
270
11th to 20thDay
14%16%39%25%7%1
270
21st to endDay
17%16%36%19%10%2
270
December1st to 10thDay
26%19%33%18%31
270
11th to 20thDay
21%17%37%16%9%
270
21st to endDay
27%15%40%14%31
297
January1st to 10thNight
24%15%35%22%4
950
11th to 20thNight
22%17%29%24%7%
920
21st to endNight
23%15%38%21%3
881
February1st to 10thNight
23%15%34%23%5%
720
11th to 20thNight
26%16%32%22%4
703
21st to endNight
26%17%34%22%2
592
March1st to 10thNight
18%17%30%29%5%
720
11th to 20thNight
19%13%36%25%7%1
588
21st to endNight
15%15%32%27%10%
594
April1st to 10thNight
15%13%32%29%10%1
540
11th to 20thNight
15%13%28%29%13%2
533
21st to endNight
12%10%34%31%11%1
540
May1st to 10thNight
13%429%37%15%2
540
11th to 20thNight
10%425%34%23%4
531
21st to endNight
6%218%38%30%7%
584
June1st to 10thNight
6%112%38%34%8%
540
11th to 20thNight
5%111%32%40%11%
540
21st to endNight
6%111%33%37%11%
540
July1st to 10thNight
2110%27%45%15%
525
11th to 20thNight
5%27%29%37%20%
522
21st to endNight
417%27%46%15%
591
August1st to 10thNight
41426%47%17%
537
11th to 20thNight
7%5%31%45%12%
534
21st to endNight
9%26%25%44%13%
594
September1st to 10thNight
9%211%31%41%7%
540
11th to 20thNight
12%213%27%39%7%
616
21st to endNight
10%115%33%37%5%
720
October1st to 10thNight
8%319%33%31%6%
720
11th to 20thNight
14%7%21%38%18%2
720
21st to endNight
19%6%24%29%20%2
792
November1st to 10thNight
14%7%23%32%21%3
740
11th to 20thNight
15%9%30%33%13%1
760
21st to endNight
19%9%29%29%12%2
760
December1st to 10thNight
22%13%29%29%8%
760
11th to 20thNight
21%10%33%28%8%
760
21st to endNight
24%15%31%25%5%
1040
Page generated at 2024-01-11 12:32:00. Version ac07

Copyright 2024 Attilla Danko


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