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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 2022-02-22.

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
47%
21648
28%
64768
18%
21602
56%
21602
36%
36683

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%
1274
30%
3302
12%
1270
46%
1270
35%
1991
January16th to endNight
33%
1360
31%
3536
11%
1360
45%
1360
36%
2136
February1st to 15thNight
29%
1173
23%
3181
8%
1169
38%
1169
28%
2021
February16th to endNight
22%
828
26%
2570
8%
828
37%
828
26%
1536
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%
756
29%
2170
34%
723
86%
723
53%
1057
August1st to 15thNight
84%
710
35%
2122
40%
707
85%
707
52%
1026
August16th to endNight
79%
765
27%
2435
30%
765
80%
765
42%
1267
September1st to 15thNight
71%
720
28%
2640
33%
720
73%
720
35%
1371
September16th to endNight
67%
717
32%
2640
32%
717
73%
717
39%
1295
October1st to 15thNight
55%
868
33%
2788
24%
868
62%
868
38%
1503
October16th to endNight
46%
1024
33%
3072
19%
1024
57%
1024
41%
1634
November1st to 15thNight
44%
1017
30%
3017
16%
1017
56%
1017
37%
1663
November16th to endNight
39%
1275
31%
3315
15%
1275
49%
1275
38%
1963
December1st to 15thNight
34%
1275
30%
3315
12%
1275
46%
1275
35%
2042
December16th to endNight
31%
1360
26%
3536
10%
1360
41%
1360
31%
2284

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%49%
65494
Night
10%413323346%55%
64964
TransparencyDay
34%5%11%22%20%5%
65194
Night
30%49%23%23%8%
64769
SeeingDay
13%7%22%28%21%6%
11540
Night
13%8%27%33%16%1
21649

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
14%6%24312335%51%
2286
16th to endDay
13%5%23323235%52%
2448
February1st to 15thDay
16%6%35%42433446%
2346
16th to endDay
19%7%34322335%43%
2223
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%
3298
August1st to 15thDay
4213435%5%6%9%53%
3071
16th to endDay
5%3135%35%6%7%9%48%
3169
September1st to 15thDay
10%423425%45%6%49%
2640
16th to endDay
8%314324446%55%
2640
October1st to 15thDay
11%41342344454%
2475
16th to endDay
13%41332222460%
2560
November1st to 15thDay
12%424214335%54%
2487
16th to endDay
14%413212235%57%
2295
December1st to 15thDay
16%6%23222335%50%
2295
16th to endDay
18%7%24312335%45%
2448
January1st to 15thNight
12%5%13313335%55%
3302
16th to endNight
12%5%23312335%56%
3536
February1st to 15thNight
14%7%2432334449%
3171
16th to endNight
15%6%24323245%50%
2570
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
211222346%10%61%
2278
August1st to 15thNight
2223235%6%9%62%
2132
16th to endNight
33134245%5%10%56%
2435
September1st to 15thNight
8%413323346%56%
2640
16th to endNight
7%313323346%59%
2640
October1st to 15thNight
11%413322245%59%
2788
16th to endNight
13%31221123461%
3072
November1st to 15thNight
9%313323346%58%
3017
16th to endNight
13%412213335%58%
3315
December1st to 15thNight
14%5%23313346%52%
3315
16th to endNight
16%6%24322335%49%
3536

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
35%38%20%24%6%
2287
16th to endDay
34%36%23%24%7%
2448
February1st to 15thDay
41%48%19%21%5%
2347
16th to endDay
44%36%16%21%7%
2223
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
22%8%18%31%17%1
3143
August1st to 15thDay
23%9%15%27%22%2
3057
16th to endDay
29%8%16%27%14%2
3169
September1st to 15thDay
32%7%11%22%18%7%
2640
16th to endDay
29%5%9%22%24%8%
2640
October1st to 15thDay
32%49%18%20%13%
2475
16th to endDay
29%36%17%29%12%
2560
November1st to 15thDay
32%39%22%22%8%
2487
16th to endDay
30%26%20%29%9%
2295
December1st to 15thDay
37%37%25%19%6%
2295
16th to endDay
41%37%20%20%5%
2448
January1st to 15thNight
31%38%19%27%8%
3302
16th to endNight
32%36%21%26%9%
3536
February1st to 15thNight
38%38%20%21%7%
3181
16th to endNight
37%47%19%21%9%
2570
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
16%5%15%33%26%2
2170
August1st to 15thNight
17%5%12%32%25%5%
2122
16th to endNight
23%6%15%31%19%4
2435
September1st to 15thNight
27%6%10%22%23%8%
2640
16th to endNight
24%49%24%25%11%
2640
October1st to 15thNight
28%49%20%21%16%
2788
16th to endNight
26%25%18%28%17%
3072
November1st to 15thNight
28%38%22%24%11%
3017
16th to endNight
30%36%20%29%10%
3315
December1st to 15thNight
33%39%21%21%9%
3315
16th to endNight
38%38%19%22%7%
3536

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%15%32%24%5%
315
16th to endDay
16%18%34%19%8%1
336
February1st to 15thDay
22%16%38%18%3
315
16th to endDay
28%16%37%14%2
261
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
25%29%44%17%
835
August1st to 15thDay
5%9%33%40%9%
774
16th to endDay
6%16%31%40%13%
697
September1st to 15thDay
5%425%39%24%
315
16th to endDay
13%310%34%26%11%
315
October1st to 15thDay
11%7%23%29%22%6%
315
16th to endDay
22%5%23%28%19%1
336
November1st to 15thDay
17%10%33%22%12%2
315
16th to endDay
19%13%34%23%9%1
315
December1st to 15thDay
19%11%34%25%8%
315
16th to endDay
22%15%33%23%5%
336
January1st to 15thNight
15%14%31%29%7%
1275
16th to endNight
15%12%35%29%6%
1360
February1st to 15thNight
18%15%34%27%3
1173
16th to endNight
20%13%41%21%3
828
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%44%5%
756
August1st to 15thNight
36%45%39%4
710
16th to endNight
5%7%42%40%4
765
September1st to 15thNight
9%110%34%40%3
720
16th to endNight
8%116%37%32%3
717
October1st to 15thNight
13%323%36%20%2
868
16th to endNight
15%7%28%32%14%1
1024
November1st to 15thNight
12%8%31%35%11%
1017
16th to endNight
16%10%32%29%11%
1275
December1st to 15thNight
18%11%33%30%6%
1275
16th to endNight
21%10%34%27%6%
1360
Page generated at 2022-02-24 00:35:18. Version ac05

Copyright 2022 A. Danko


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