Kingsland
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kingsland clear sky chart from 2005-11-05 to 2017-09-22.

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
55%
15873
21%
46969
15%
15835
61%
15835
29%
29522

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
38%
717
20%
2327
11%
716
50%
716
24%
1422
January16th to endNight
39%
768
22%
2496
15%
768
50%
768
26%
1523
February1st to 15thNight
38%
701
22%
2115
13%
700
49%
700
27%
1316
February16th to endNight
37%
631
24%
1852
12%
631
48%
631
28%
1154
March1st to 15thNight
44%
720
27%
1980
15%
720
54%
720
36%
1175
March16th to endNight
47%
768
24%
2112
14%
768
55%
768
37%
1254
April1st to 15thNight
50%
718
25%
1976
16%
718
56%
718
38%
1182
April16th to endNight
57%
690
29%
1782
18%
690
62%
690
43%
1040
May1st to 15thNight
64%
539
25%
1619
17%
539
69%
539
39%
907
May16th to endNight
69%
561
21%
1682
17%
561
70%
561
34%
1020
June1st to 15thNight
71%
540
14%
1620
11%
540
72%
540
27%
1051
June16th to endNight
72%
540
10%
1620
9%
540
73%
540
25%
1089
July1st to 15thNight
73%
510
11%
1530
10%
510
73%
510
27%
987
July16th to endNight
77%
564
10%
1595
9%
531
78%
531
25%
1077
August1st to 15thNight
76%
539
11%
1609
10%
536
76%
536
24%
1103
August16th to endNight
64%
690
11%
1949
11%
690
65%
690
20%
1414
September1st to 15thNight
63%
720
12%
1980
11%
720
63%
720
20%
1458
September16th to endNight
57%
685
15%
1892
13%
685
58%
685
21%
1374
October1st to 15thNight
58%
660
26%
1892
24%
660
62%
660
33%
1158
October16th to endNight
60%
704
31%
2112
28%
704
67%
704
34%
1220
November1st to 15thNight
54%
700
28%
2101
23%
700
62%
700
34%
1227
November16th to endNight
47%
720
26%
2292
19%
720
59%
720
30%
1352
December1st to 15thNight
43%
720
22%
2340
17%
720
51%
720
25%
1458
December16th to endNight
48%
768
22%
2496
18%
768
56%
768
24%
1561

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%5%25%6%35%5%6%8%38%
47893
Night
9%5%25%5%35%5%6%8%44%
47175
TransparencyDay
40%7%14%17%13%5%
47594
Night
36%7%14%19%14%7%
46978
SeeingDay
11%315%24%25%19%
5725
Night
12%418%31%27%5%
15882

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 15thDay
10%6%36%5%35%35%8%41%
1611
16th to endDay
14%5%24424446%45%
1728
February1st to 15thDay
13%7%35%423335%45%
1738
16th to endDay
13%5%35%423235%49%
1619
March1st to 15thDay
9%41432435%7%52%
1980
16th to endDay
9%5%25%424447%48%
2111
April1st to 15thDay
9%4245%2445%6%49%
1972
16th to endDay
7%41442445%8%49%
2185
May1st to 15thDay
7%315%4345%5%10%47%
2331
16th to endDay
10%325%5%46%5%5%10%39%
2431
June1st to 15thDay
10%425%7%5%6%7%8%10%31%
2340
16th to endDay
7%5%36%7%5%8%7%8%9%30%
2340
July1st to 15thDay
7%5%26%7%5%8%7%8%12%28%
2340
16th to endDay
7%6%37%8%48%7%8%12%25%
2465
August1st to 15thDay
9%6%38%9%48%8%8%10%21%
2340
16th to endDay
13%7%36%8%5%7%7%8%9%21%
2235
September1st to 15thDay
12%7%37%7%6%7%6%6%9%24%
1980
16th to endDay
19%8%37%7%36%6%7%7%23%
1881
October1st to 15thDay
11%7%26%7%345%5%6%39%
1736
16th to endDay
9%5%15%423446%51%
1760
November1st to 15thDay
10%3235%2435%7%51%
1757
16th to endDay
10%5%245%34445%49%
1665
December1st to 15thDay
13%6%35%6%33436%42%
1620
16th to endDay
11%5%246%36%45%6%42%
1728
January1st to 15thNight
11%6%35%42445%6%44%
2327
16th to endNight
13%5%25%5%2335%6%45%
2496
February1st to 15thNight
13%6%25%5%2333448%
2112
16th to endNight
12%6%245%34345%47%
1852
March1st to 15thNight
8%4245%2336%9%50%
1980
16th to endNight
8%424423345%55%
2112
April1st to 15thNight
8%42431445%7%53%
1976
16th to endNight
6%41332346%8%55%
1782
May1st to 15thNight
7%22342446%8%54%
1619
16th to endNight
7%4145%25%5%7%10%46%
1682
June1st to 15thNight
8%4245%37%7%7%11%36%
1620
16th to endNight
8%325%6%37%7%8%14%33%
1620
July1st to 15thNight
6%4246%35%6%8%14%36%
1620
16th to endNight
4435%6%48%8%9%11%33%
1703
August1st to 15thNight
5%425%6%46%9%8%12%33%
1620
16th to endNight
11%5%26%6%37%6%8%11%29%
1949
September1st to 15thNight
10%6%37%7%46%6%6%9%30%
1980
16th to endNight
13%8%27%6%46%5%7%9%29%
1892
October1st to 15thNight
10%7%25%423446%47%
1892
16th to endNight
7%5%15%424445%53%
2112
November1st to 15thNight
8%424424447%51%
2101
16th to endNight
10%5%2442445%6%49%
2292
December1st to 15thNight
11%6%35%5%34447%42%
2340
16th to endNight
12%6%35%435%45%7%42%
2496

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
41%49%16%17%9%
1612
16th to endDay
39%46%18%21%9%
1728
February1st to 15thDay
42%46%12%20%13%
1740
16th to endDay
37%39%17%20%12%
1619
March1st to 15thDay
30%411%23%20%9%
1980
16th to endDay
35%5%12%17%20%8%
2112
April1st to 15thDay
33%5%11%20%20%9%
1972
16th to endDay
30%6%13%21%20%7%
2185
May1st to 15thDay
31%5%12%24%19%6%
2331
16th to endDay
37%8%14%20%15%3
2435
June1st to 15thDay
43%8%18%20%7%
2340
16th to endDay
44%11%20%16%6%
2340
July1st to 15thDay
42%11%28%15%2
2201
16th to endDay
44%13%22%15%3
2310
August1st to 15thDay
49%14%22%11%1
2327
16th to endDay
52%12%18%13%1
2235
September1st to 15thDay
51%12%14%12%8%
1980
16th to endDay
57%8%12%11%7%2
1881
October1st to 15thDay
42%5%8%17%16%9%
1736
16th to endDay
33%37%18%22%13%
1760
November1st to 15thDay
32%49%21%21%9%
1757
16th to endDay
37%48%17%20%11%
1665
December1st to 15thDay
42%410%20%15%6%
1620
16th to endDay
38%6%12%21%13%7%
1728
January1st to 15thNight
38%5%10%17%17%10%
2327
16th to endNight
39%49%14%20%11%
2496
February1st to 15thNight
39%46%15%20%14%
2121
16th to endNight
39%49%16%18%11%
1852
March1st to 15thNight
30%5%12%23%18%9%
1980
16th to endNight
31%412%20%20%10%
2112
April1st to 15thNight
30%5%9%22%21%10%
1976
16th to endNight
25%6%13%24%22%7%
1782
May1st to 15thNight
27%6%15%26%17%6%
1620
16th to endNight
31%8%17%25%13%3
1684
June1st to 15thNight
35%11%22%23%7%
1620
16th to endNight
37%12%23%18%6%
1620
July1st to 15thNight
33%12%29%20%2
1530
16th to endNight
36%13%26%19%3
1595
August1st to 15thNight
36%14%30%15%3
1609
16th to endNight
44%12%22%15%3
1949
September1st to 15thNight
47%11%17%15%7%1
1980
16th to endNight
47%9%15%16%8%2
1892
October1st to 15thNight
35%412%18%20%8%
1892
16th to endNight
31%5%7%18%21%14%
2112
November1st to 15thNight
32%49%19%22%10%
2101
16th to endNight
34%5%9%18%18%13%
2292
December1st to 15thNight
41%412%19%15%6%
2340
16th to endNight
39%6%10%20%13%8%
2496

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
15%8%37%24%6%6%
90
16th to endDay
11%16%34%23%13%
96
February1st to 15thDay
13%21%31%20%14%
90
16th to endDay
10%8%39%35%5%
120
March1st to 15thDay
12%7%28%33%15%1
270
16th to endDay
11%332%27%18%6%
288
April1st to 15thDay
11%7%27%27%21%5%
270
16th to endDay
5%5%18%31%23%15%
270
May1st to 15thDay
5%5%20%32%23%11%
288
16th to endDay
10%111%18%33%24%
331
June1st to 15thDay
12%17%22%27%27%
315
16th to endDay
9%1322%26%36%
315
July1st to 15thDay
4112%32%48%
305
16th to endDay
9%1315%31%37%
326
August1st to 15thDay
13%416%32%32%
313
16th to endDay
14%1314%30%35%
332
September1st to 15thDay
20%16%18%27%24%
315
16th to endDay
20%6%22%31%19%
278
October1st to 15thDay
15%5%16%28%24%9%
255
16th to endDay
11%219%30%27%7%
272
November1st to 15thDay
13%5%20%31%21%6%
265
16th to endDay
10%6%31%30%17%3
135
December1st to 15thDay
6%5%38%28%14%5%
90
16th to endDay
15%5%17%41%18%1
96
January1st to 15thNight
15%11%29%28%13%1
720
16th to endNight
15%8%29%35%9%
768
February1st to 15thNight
15%9%31%34%9%
704
16th to endNight
15%8%31%36%7%
631
March1st to 15thNight
10%7%30%37%13%
720
16th to endNight
10%6%28%37%15%1
768
April1st to 15thNight
11%5%28%37%16%1
718
16th to endNight
9%5%24%38%21%1
690
May1st to 15thNight
7%219%41%26%2
540
16th to endNight
8%110%29%40%9%
563
June1st to 15thNight
8%17%32%38%10%
540
16th to endNight
9%15%23%45%14%
540
July1st to 15thNight
7%1322%48%17%
510
16th to endNight
3325%52%14%
564
August1st to 15thNight
6%122%53%14%
539
16th to endNight
15%320%44%15%
690
September1st to 15thNight
13%25%22%44%12%
720
16th to endNight
19%38%22%38%8%
685
October1st to 15thNight
15%213%29%34%4
660
16th to endNight
10%416%34%29%4
704
November1st to 15thNight
11%6%20%35%25%1
700
16th to endNight
11%6%28%31%19%2
720
December1st to 15thNight
15%7%26%29%20%1
720
16th to endNight
15%6%22%37%17%1
768
Page generated at 2017-09-23 06:43:37. Version ac04

Copyright 2017 A. Danko


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