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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 2021-07-27.

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%
20791
28%
62292
18%
20745
56%
20745
35%
35409

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%
1199
29%
3107
11%
1195
46%
1195
34%
1878
January16th to endNight
33%
1280
31%
3328
12%
1280
45%
1280
35%
2030
February1st to 15thNight
28%
1103
23%
2991
8%
1099
38%
1099
27%
1910
February16th to endNight
23%
800
27%
2486
9%
800
38%
800
26%
1485
March1st to 15thNight
29%
720
25%
2640
14%
720
42%
720
23%
1557
March16th to endNight
31%
768
22%
2816
13%
768
44%
768
25%
1644
April1st to 15thNight
31%
719
25%
2581
15%
719
47%
719
27%
1431
April16th to endNight
33%
714
25%
2282
15%
714
48%
714
31%
1310
May1st to 15thNight
41%
720
23%
2160
16%
720
53%
720
31%
1310
May16th to endNight
50%
755
24%
2260
20%
753
61%
753
35%
1329
June1st to 15thNight
70%
720
25%
2160
26%
720
74%
720
46%
1138
June16th to endNight
74%
720
25%
2160
26%
720
77%
720
48%
1099
July1st to 15thNight
77%
690
23%
2070
25%
690
79%
690
46%
1076
July16th to endNight
85%
744
29%
2134
34%
711
86%
711
52%
1042
August1st to 15thNight
84%
665
34%
1987
38%
662
85%
662
52%
961
August16th to endNight
79%
717
28%
2282
32%
717
80%
717
42%
1193
September1st to 15thNight
69%
675
25%
2475
29%
675
71%
675
33%
1320
September16th to endNight
67%
672
33%
2475
33%
672
73%
672
38%
1234
October1st to 15thNight
55%
814
31%
2614
24%
814
62%
814
38%
1410
October16th to endNight
46%
960
34%
2880
19%
960
57%
960
41%
1532
November1st to 15thNight
44%
956
29%
2836
16%
956
55%
956
37%
1576
November16th to endNight
39%
1200
32%
3120
15%
1200
49%
1200
38%
1862
December1st to 15thNight
34%
1200
29%
3120
12%
1200
46%
1200
34%
1932
December16th to endNight
31%
1280
26%
3328
11%
1280
42%
1280
31%
2150

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%
63346
Night
10%413323346%54%
62488
TransparencyDay
35%5%11%22%19%5%
63046
Night
30%410%23%22%8%
62293
SeeingDay
13%7%22%28%21%6%
10848
Night
13%7%27%33%16%1
20792

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%6%24213335%51%
2151
16th to endDay
14%5%24323235%51%
2304
February1st to 15thDay
16%6%35%42433445%
2205
16th to endDay
20%7%35%312335%44%
2154
March1st to 15thDay
17%6%24424335%45%
2640
16th to endDay
17%7%25%42334443%
2814
April1st to 15thDay
14%5%245%13446%46%
2687
16th to endDay
14%5%25%425%346%44%
2939
May1st to 15thDay
15%6%35%424346%43%
3111
16th to endDay
11%6%25%5%45%5%5%7%40%
3262
June1st to 15thDay
6%5%15%435%5%5%9%47%
3120
16th to endDay
5%313435%6%7%9%49%
3120
July1st to 15thDay
5%4245%36%6%7%10%44%
3120
16th to endDay
4213435%5%7%10%51%
3239
August1st to 15thDay
4213435%6%6%9%53%
2876
16th to endDay
5%3145%35%6%7%9%47%
2971
September1st to 15thDay
11%423435%45%6%47%
2475
16th to endDay
9%414424446%54%
2475
October1st to 15thDay
11%5%13423445%54%
2321
16th to endDay
14%41332223459%
2400
November1st to 15thDay
12%424314345%54%
2338
16th to endDay
14%413212236%57%
2160
December1st to 15thDay
17%6%23222335%50%
2160
16th to endDay
18%7%24312335%46%
2304
January1st to 15thNight
12%5%13313335%55%
3107
16th to endNight
12%5%23312335%55%
3328
February1st to 15thNight
14%7%2442334448%
2981
16th to endNight
15%6%24323245%50%
2486
March1st to 15thNight
15%6%25%422345%47%
2640
16th to endNight
14%6%24313346%49%
2816
April1st to 15thNight
11%425%323346%51%
2581
16th to endNight
13%413423236%52%
2282
May1st to 15thNight
11%423424446%49%
2159
16th to endNight
7%32442445%9%50%
2259
June1st to 15thNight
331332345%7%61%
2160
16th to endNight
321222435%9%61%
2160
July1st to 15thNight
32124235%5%11%56%
2160
16th to endNight
211232346%10%60%
2242
August1st to 15thNight
3123235%6%9%61%
1997
16th to endNight
33134245%5%10%55%
2282
September1st to 15thNight
9%42432345%6%54%
2475
16th to endNight
7%31332335%6%58%
2475
October1st to 15thNight
10%413322235%58%
2614
16th to endNight
13%31221123461%
2880
November1st to 15thNight
9%313323346%57%
2836
16th to endNight
13%412213235%57%
3120
December1st to 15thNight
14%5%23313346%52%
3120
16th to endNight
16%6%24322335%49%
3328

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%20%25%5%
2152
16th to endDay
35%36%23%24%6%
2304
February1st to 15thDay
42%48%20%20%4
2206
16th to endDay
44%36%17%21%6%
2154
March1st to 15thDay
41%48%18%18%8%
2640
16th to endDay
44%47%21%17%4
2816
April1st to 15thDay
38%5%11%20%18%6%
2687
16th to endDay
40%5%9%20%18%4
2939
May1st to 15thDay
41%6%11%19%18%3
3111
16th to endDay
42%7%11%21%16%1
3266
June1st to 15thDay
33%6%13%26%16%3
3120
16th to endDay
29%8%13%25%21%2
3120
July1st to 15thDay
31%10%18%25%13%
2981
16th to endDay
23%8%18%31%17%1
3084
August1st to 15thDay
22%8%16%27%22%2
2862
16th to endDay
30%8%16%26%15%3
2971
September1st to 15thDay
34%7%12%22%16%7%
2475
16th to endDay
30%5%10%21%23%7%
2475
October1st to 15thDay
32%410%18%20%13%
2321
16th to endDay
30%36%18%29%12%
2400
November1st to 15thDay
32%310%21%23%8%
2338
16th to endDay
31%26%20%29%9%
2160
December1st to 15thDay
37%37%26%19%6%
2160
16th to endDay
40%37%20%21%5%
2304
January1st to 15thNight
31%38%19%27%8%
3107
16th to endNight
33%36%21%26%9%
3328
February1st to 15thNight
39%38%20%20%6%
2991
16th to endNight
37%47%20%21%9%
2486
March1st to 15thNight
40%37%17%19%12%
2640
16th to endNight
36%5%10%21%20%5%
2816
April1st to 15thNight
34%410%20%19%11%
2581
16th to endNight
32%49%23%22%7%
2282
May1st to 15thNight
35%5%11%21%19%6%
2160
16th to endNight
29%7%15%26%16%3
2261
June1st to 15thNight
21%6%11%31%23%4
2160
16th to endNight
19%6%13%28%27%4
2160
July1st to 15thNight
20%7%17%31%19%2
2070
16th to endNight
17%5%15%34%25%2
2134
August1st to 15thNight
17%5%12%32%26%6%
1987
16th to endNight
23%6%15%30%19%4
2282
September1st to 15thNight
29%6%11%22%21%8%
2475
16th to endNight
25%49%25%24%10%
2475
October1st to 15thNight
28%39%20%20%16%
2614
16th to endNight
27%25%19%28%16%
2880
November1st to 15thNight
28%38%22%24%11%
2836
16th to endNight
30%36%19%28%10%
3120
December1st to 15thNight
33%49%22%21%9%
3120
16th to endNight
38%37%19%23%7%
3328

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
22%14%32%24%5%
270
16th to endDay
18%19%33%18%7%1
288
February1st to 15thDay
23%16%40%16%2
270
16th to endDay
27%16%38%14%2
240
March1st to 15thDay
24%22%29%18%5%
270
16th to endDay
18%15%38%18%6%2
288
April1st to 15thDay
18%17%33%24%5%
326
16th to endDay
17%15%35%24%5%2
591
May1st to 15thDay
17%9%35%27%9%1
768
16th to endDay
14%6%31%27%15%3
837
June1st to 15thDay
7%218%37%26%7%
795
16th to endDay
6%217%35%30%8%
795
July1st to 15thDay
410%34%34%15%
775
16th to endDay
26%29%44%16%
813
August1st to 15thDay
5%9%33%41%10%
699
16th to endDay
7%6%33%40%12%
627
September1st to 15thDay
6%323%38%27%
270
16th to endDay
15%211%33%25%11%
270
October1st to 15thDay
10%7%20%30%23%7%
270
16th to endDay
22%6%23%27%19%1
288
November1st to 15thDay
19%9%34%24%10%2
270
16th to endDay
19%12%34%22%9%1
270
December1st to 15thDay
21%9%34%24%9%
270
16th to endDay
22%14%31%25%5%
288
January1st to 15thNight
15%14%31%30%7%
1200
16th to endNight
16%12%35%28%6%
1280
February1st to 15thNight
18%15%34%27%3
1103
16th to endNight
20%13%42%21%3
800
March1st to 15thNight
17%12%37%26%5%
720
16th to endNight
18%10%36%27%6%
768
April1st to 15thNight
13%14%37%27%6%
719
16th to endNight
14%9%39%28%7%
714
May1st to 15thNight
13%6%36%34%9%
720
16th to endNight
8%331%36%18%1
755
June1st to 15thNight
4217%46%26%2
720
16th to endNight
3115%50%25%3
720
July1st to 15thNight
39%41%39%4
690
16th to endNight
25%41%43%5%
744
August1st to 15thNight
35%45%40%4
665
16th to endNight
5%7%43%39%4
717
September1st to 15thNight
10%111%33%39%4
675
16th to endNight
8%116%37%32%3
672
October1st to 15thNight
13%323%36%21%2
814
16th to endNight
15%6%28%32%14%1
960
November1st to 15thNight
12%9%31%34%11%
956
16th to endNight
16%10%31%29%11%
1200
December1st to 15thNight
18%11%33%30%6%
1200
16th to endNight
21%10%34%27%6%
1280
Page generated at 2021-07-28 17:31:18. Version ac04

Copyright 2021 A. Danko


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