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TAS-D Atoka
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the TAS-D Atoka clear sky chart from 2005-11-05 to 2020-06-03.

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%
19302
27%
57817
18%
19256
56%
19256
35%
32788

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
35%
1124
29%
2912
11%
1120
46%
1120
35%
1746
January16th to endNight
35%
1200
32%
3120
12%
1200
47%
1200
36%
1876
February1st to 15thNight
30%
1034
23%
2802
8%
1030
39%
1030
28%
1767
February16th to endNight
23%
751
27%
2333
9%
751
39%
751
25%
1398
March1st to 15thNight
28%
675
25%
2475
14%
675
42%
675
24%
1453
March16th to endNight
31%
720
22%
2640
13%
720
44%
720
25%
1554
April1st to 15thNight
31%
674
24%
2419
14%
674
46%
674
27%
1343
April16th to endNight
35%
669
26%
2138
16%
669
50%
669
32%
1211
May1st to 15thNight
40%
675
22%
2025
15%
675
53%
675
31%
1223
May16th to endNight
52%
707
26%
2116
21%
705
63%
705
38%
1211
June1st to 15thNight
70%
637
25%
1912
25%
637
74%
637
47%
1004
June16th to endNight
76%
630
25%
1890
26%
630
79%
630
49%
954
July1st to 15thNight
77%
600
21%
1800
23%
600
79%
600
44%
949
July16th to endNight
86%
660
30%
1882
35%
627
88%
627
54%
903
August1st to 15thNight
85%
620
34%
1852
40%
617
85%
617
51%
901
August16th to endNight
78%
669
27%
2129
30%
669
79%
669
41%
1122
September1st to 15thNight
69%
630
26%
2310
31%
630
71%
630
34%
1210
September16th to endNight
68%
627
33%
2310
32%
627
73%
627
38%
1150
October1st to 15thNight
54%
759
31%
2439
24%
759
61%
759
37%
1338
October16th to endNight
47%
896
35%
2688
20%
896
58%
896
42%
1406
November1st to 15thNight
45%
895
29%
2655
16%
895
55%
895
37%
1474
November16th to endNight
39%
1125
31%
2925
15%
1125
49%
1125
37%
1759
December1st to 15thNight
34%
1125
29%
2925
12%
1125
45%
1125
34%
1815
December16th to endNight
31%
1200
26%
3120
11%
1200
42%
1200
31%
2021

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
11%5%24424446%48%
58592
Night
10%413323346%54%
58013
TransparencyDay
35%5%11%22%19%5%
58292
Night
30%410%23%22%8%
57818
SeeingDay
13%6%22%28%22%7%
9218
Night
13%7%27%33%16%1
19303

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
15%5%24213335%51%
2016
16th to endDay
14%5%24323245%51%
2160
February1st to 15thDay
15%6%35%42433447%
2064
16th to endDay
20%7%34322335%44%
2021
March1st to 15thDay
17%6%24424335%45%
2475
16th to endDay
18%7%25%42334442%
2638
April1st to 15thDay
14%5%245%13447%46%
2518
16th to endDay
13%5%25%425%346%44%
2753
May1st to 15thDay
14%5%35%42435%6%43%
2916
16th to endDay
10%6%245%45%5%5%7%42%
3054
June1st to 15thDay
7%5%15%5%35%5%5%9%46%
2757
16th to endDay
5%323435%6%7%9%50%
2730
July1st to 15thDay
5%4245%36%7%7%10%42%
2730
16th to endDay
3113435%5%7%10%52%
2882
August1st to 15thDay
4213435%6%6%9%53%
2681
16th to endDay
5%3145%35%6%7%10%46%
2771
September1st to 15thDay
11%423435%45%6%48%
2310
16th to endDay
9%414424446%54%
2310
October1st to 15thDay
11%5%13423445%53%
2166
16th to endDay
12%31231223461%
2240
November1st to 15thDay
12%424314345%54%
2190
16th to endDay
15%423212225%57%
2025
December1st to 15thDay
16%6%23222335%50%
2025
16th to endDay
18%7%24312335%46%
2160
January1st to 15thNight
12%5%13313335%55%
2912
16th to endNight
12%5%23312335%56%
3120
February1st to 15thNight
14%6%1432334449%
2792
16th to endNight
15%6%24323245%49%
2333
March1st to 15thNight
15%5%25%422345%47%
2475
16th to endNight
14%5%34313346%48%
2640
April1st to 15thNight
11%425%323347%51%
2419
16th to endNight
12%413413236%53%
2138
May1st to 15thNight
10%423424447%50%
2024
16th to endNight
6%32442445%9%53%
2115
June1st to 15thNight
331331345%7%61%
1912
16th to endNight
321222445%10%61%
1890
July1st to 15thNight
42223235%6%12%54%
1890
16th to endNight
31222347%10%62%
1990
August1st to 15thNight
3123235%6%9%61%
1862
16th to endNight
33134245%5%11%54%
2129
September1st to 15thNight
9%42432345%6%55%
2310
16th to endNight
7%31332335%6%58%
2310
October1st to 15thNight
11%423322345%57%
2439
16th to endNight
12%31222123462%
2688
November1st to 15thNight
9%313323346%57%
2655
16th to endNight
14%423313335%56%
2925
December1st to 15thNight
14%5%23313346%51%
2925
16th to endNight
16%6%24322335%49%
3120

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
36%38%21%24%5%
2017
16th to endDay
35%36%23%24%6%
2160
February1st to 15thDay
40%48%20%21%4
2065
16th to endDay
43%36%18%21%6%
2021
March1st to 15thDay
41%48%18%17%8%
2475
16th to endDay
46%5%7%20%17%3
2640
April1st to 15thDay
38%5%11%20%17%6%
2518
16th to endDay
39%5%9%20%19%4
2753
May1st to 15thDay
41%6%11%19%18%3
2916
16th to endDay
40%7%11%21%17%1
3058
June1st to 15thDay
35%7%13%26%16%1
2757
16th to endDay
28%7%14%25%20%2
2730
July1st to 15thDay
33%10%19%25%11%
2591
16th to endDay
22%8%18%30%18%1
2727
August1st to 15thDay
23%9%15%25%23%2
2667
16th to endDay
31%8%16%26%12%3
2771
September1st to 15thDay
34%6%12%21%16%8%
2310
16th to endDay
30%5%10%22%23%6%
2310
October1st to 15thDay
34%5%10%18%19%12%
2166
16th to endDay
28%36%18%29%13%
2240
November1st to 15thDay
33%310%22%22%7%
2190
16th to endDay
31%26%20%30%8%
2025
December1st to 15thDay
37%37%26%19%5%
2025
16th to endDay
41%37%20%20%5%
2160
January1st to 15thNight
31%38%20%27%8%
2912
16th to endNight
31%36%21%26%9%
3120
February1st to 15thNight
38%38%21%21%7%
2802
16th to endNight
37%47%20%20%8%
2333
March1st to 15thNight
39%37%18%20%10%
2475
16th to endNight
37%5%10%21%19%5%
2640
April1st to 15thNight
34%411%20%19%10%
2419
16th to endNight
31%49%24%22%7%
2138
May1st to 15thNight
35%5%11%21%18%7%
2025
16th to endNight
27%7%14%28%17%4
2117
June1st to 15thNight
20%6%12%33%23%3
1912
16th to endNight
19%5%13%29%26%5%
1890
July1st to 15thNight
21%7%18%32%17%2
1800
16th to endNight
15%5%14%33%27%2
1882
August1st to 15thNight
18%5%12%32%25%6%
1852
16th to endNight
23%6%15%30%18%4
2129
September1st to 15thNight
28%5%11%22%22%9%
2310
16th to endNight
25%410%26%23%9%
2310
October1st to 15thNight
29%410%20%20%14%
2439
16th to endNight
25%25%18%29%17%
2688
November1st to 15thNight
28%39%23%24%10%
2655
16th to endNight
31%36%20%29%9%
2925
December1st to 15thNight
34%49%22%21%8%
2925
16th to endNight
38%38%18%22%7%
3120

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
24%12%33%23%5%
225
16th to endDay
16%18%33%20%9%1
240
February1st to 15thDay
20%16%39%19%3
225
16th to endDay
29%13%38%14%2
201
March1st to 15thDay
25%21%29%18%4
225
16th to endDay
20%14%36%20%6%2
240
April1st to 15thDay
19%16%32%25%5%
277
16th to endDay
17%13%34%25%6%2
525
May1st to 15thDay
16%8%35%27%10%1
693
16th to endDay
13%6%32%27%16%4
757
June1st to 15thDay
8%118%35%28%6%
656
16th to endDay
6%117%33%30%9%
645
July1st to 15thDay
5%9%34%33%15%
625
16th to endDay
25%28%44%18%
675
August1st to 15thDay
6%7%31%43%11%
624
16th to endDay
7%6%33%39%12%
555
September1st to 15thDay
4420%39%30%
225
16th to endDay
15%110%31%28%12%
225
October1st to 15thDay
12%7%16%29%26%7%
225
16th to endDay
20%5%23%29%19%1
240
November1st to 15thDay
21%8%30%24%12%2
225
16th to endDay
20%12%32%22%10%1
225
December1st to 15thDay
20%11%33%24%9%
225
16th to endDay
22%12%31%25%6%
240
January1st to 15thNight
15%15%31%30%7%
1125
16th to endNight
15%12%34%30%7%
1200
February1st to 15thNight
18%15%33%28%3
1034
16th to endNight
20%12%41%21%3
751
March1st to 15thNight
17%12%38%26%5%
675
16th to endNight
18%9%37%27%6%
720
April1st to 15thNight
13%14%39%27%6%
674
16th to endNight
14%9%38%29%7%
669
May1st to 15thNight
12%5%37%33%10%
675
16th to endNight
6%232%36%19%1
707
June1st to 15thNight
4118%46%26%2
637
16th to endNight
314%50%25%3
630
July1st to 15thNight
49%42%38%4
600
16th to endNight
25%40%44%6%
660
August1st to 15thNight
3443%42%5%
620
16th to endNight
5%7%42%40%4
669
September1st to 15thNight
10%111%32%40%4
630
16th to endNight
8%116%36%33%3
627
October1st to 15thNight
14%322%35%21%2
759
16th to endNight
14%6%28%32%15%1
896
November1st to 15thNight
12%9%30%35%12%
895
16th to endNight
17%9%31%28%12%
1125
December1st to 15thNight
18%11%32%29%7%
1125
16th to endNight
20%9%34%27%7%
1200
Page generated at 2020-06-04 02:18:53. Version ac04

Copyright 2020 A. Danko


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