Atoka
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Atoka clear sky chart from 2005-11-05 to 2017-04-30.

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%
15240
28%
45613
19%
15194
56%
15194
36%
25687

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%
899
30%
2327
12%
895
47%
895
37%
1361
January16th to endNight
35%
960
32%
2496
12%
960
47%
960
38%
1477
February1st to 15thNight
31%
824
25%
2232
9%
820
41%
820
31%
1360
February16th to endNight
25%
599
30%
1861
9%
599
42%
599
29%
1057
March1st to 15thNight
30%
540
26%
1980
14%
540
44%
540
24%
1154
March16th to endNight
31%
576
22%
2112
15%
576
42%
576
26%
1237
April1st to 15thNight
31%
539
23%
1935
14%
539
46%
539
28%
1053
April16th to endNight
35%
537
25%
1719
17%
537
49%
537
31%
984
May1st to 15thNight
35%
495
22%
1485
13%
495
49%
495
28%
938
May16th to endNight
51%
515
25%
1540
20%
513
61%
513
36%
894
June1st to 15thNight
68%
495
25%
1485
25%
495
72%
495
46%
782
June16th to endNight
76%
495
23%
1485
24%
495
79%
495
48%
763
July1st to 15thNight
74%
465
22%
1395
24%
465
76%
465
43%
745
July16th to endNight
86%
522
29%
1468
35%
489
87%
489
54%
712
August1st to 15thNight
88%
494
37%
1475
43%
491
88%
491
55%
694
August16th to endNight
76%
525
27%
1671
30%
525
78%
525
39%
901
September1st to 15thNight
66%
495
26%
1815
31%
495
69%
495
31%
994
September16th to endNight
71%
492
34%
1815
35%
492
76%
492
40%
873
October1st to 15thNight
54%
597
33%
1917
24%
597
61%
597
38%
1040
October16th to endNight
47%
704
35%
2112
19%
704
59%
704
45%
1071
November1st to 15thNight
47%
712
31%
2112
18%
712
58%
712
39%
1130
November16th to endNight
37%
900
31%
2340
15%
900
46%
900
36%
1421
December1st to 15thNight
34%
900
28%
2340
12%
900
45%
900
34%
1453
December16th to endNight
31%
960
26%
2496
11%
960
42%
960
32%
1593

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%424424446%49%
46113
Night
10%413323346%55%
45809
TransparencyDay
35%5%10%22%20%5%
45813
Night
29%49%23%23%8%
45614
SeeingDay
11%5%20%29%24%7%
5018
Night
12%8%28%32%16%1
15241

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%5%24212325%53%
1611
16th to endDay
13%5%23323246%52%
1728
February1st to 15thDay
14%5%25%32433451%
1641
16th to endDay
18%6%3422233448%
1613
March1st to 15thDay
17%6%23424335%46%
1980
16th to endDay
17%7%35%42333442%
2110
April1st to 15thDay
13%5%23413346%49%
2013
16th to endDay
14%5%25%425%347%43%
2217
May1st to 15thDay
17%7%35%424345%40%
2136
16th to endDay
10%6%25%5%46%5%5%6%39%
2222
June1st to 15thDay
7%4145%35%5%5%9%46%
2145
16th to endDay
6%323435%6%7%9%49%
2145
July1st to 15thDay
6%4245%46%7%7%9%41%
2145
16th to endDay
4123435%5%7%10%50%
2284
August1st to 15thDay
2112435%5%6%9%56%
2145
16th to endDay
7%3246%35%7%7%10%41%
2175
September1st to 15thDay
13%4235%35%45%7%45%
1815
16th to endDay
7%313324437%57%
1815
October1st to 15thDay
11%5%13423445%53%
1702
16th to endDay
10%31331223463%
1760
November1st to 15thDay
11%423224345%56%
1743
16th to endDay
16%422212225%56%
1620
December1st to 15thDay
17%6%33222335%49%
1620
16th to endDay
19%6%24212335%48%
1728
January1st to 15thNight
11%413313335%58%
2327
16th to endNight
10%423312345%57%
2496
February1st to 15thNight
13%6%1432333453%
2222
16th to endNight
13%5%24323245%54%
1861
March1st to 15thNight
15%5%25%322345%48%
1980
16th to endNight
13%5%34413346%49%
2112
April1st to 15thNight
10%325%333347%52%
1935
16th to endNight
12%423414246%53%
1719
May1st to 15thNight
11%5%23425%45%7%46%
1484
16th to endNight
6%32442445%9%52%
1539
June1st to 15thNight
431231345%7%61%
1485
16th to endNight
421221445%9%60%
1485
July1st to 15thNight
42223245%6%12%52%
1485
16th to endNight
311221346%10%61%
1576
August1st to 15thNight
1122235%6%10%62%
1485
16th to endNight
43134245%5%11%51%
1671
September1st to 15thNight
11%42431345%6%51%
1815
16th to endNight
5%32332335%7%59%
1815
October1st to 15thNight
11%423323345%58%
1917
16th to endNight
10%212221235%65%
2112
November1st to 15thNight
8%313313346%60%
2112
16th to endNight
14%423313225%56%
2340
December1st to 15thNight
15%5%23312346%51%
2340
16th to endNight
15%6%24322335%51%
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
34%37%22%25%6%
1612
16th to endDay
34%36%23%25%6%
1728
February1st to 15thDay
37%48%21%23%5%
1642
16th to endDay
40%36%20%21%7%
1613
March1st to 15thDay
40%49%20%17%7%
1980
16th to endDay
45%47%19%18%3
2112
April1st to 15thDay
36%410%21%18%7%
2013
16th to endDay
40%5%9%19%20%5%
2217
May1st to 15thDay
45%5%9%16%18%3
2136
16th to endDay
43%8%11%19%15%1
2226
June1st to 15thDay
34%6%13%25%17%1
2145
16th to endDay
29%7%14%23%21%2
2145
July1st to 15thDay
35%8%17%26%11%
2006
16th to endDay
24%8%18%28%18%1
2129
August1st to 15thDay
19%8%15%26%26%2
2131
16th to endDay
35%9%14%24%11%3
2175
September1st to 15thDay
36%6%13%19%15%9%
1815
16th to endDay
26%5%9%23%26%8%
1815
October1st to 15thDay
33%410%19%18%13%
1702
16th to endDay
26%37%19%31%12%
1760
November1st to 15thDay
30%410%24%23%7%
1743
16th to endDay
32%25%18%30%9%
1620
December1st to 15thDay
38%37%26%20%3
1620
16th to endDay
39%37%22%21%5%
1728
January1st to 15thNight
29%38%20%30%8%
2327
16th to endNight
29%37%20%28%9%
2496
February1st to 15thNight
35%37%23%22%8%
2232
16th to endNight
32%47%24%21%9%
1861
March1st to 15thNight
38%37%19%19%10%
1980
16th to endNight
36%5%10%21%20%5%
2112
April1st to 15thNight
33%311%19%19%12%
1935
16th to endNight
32%5%9%21%22%8%
1719
May1st to 15thNight
39%5%11%18%16%8%
1485
16th to endNight
28%8%15%28%14%4
1541
June1st to 15thNight
20%7%12%32%23%3
1485
16th to endNight
20%5%13%27%25%6%
1485
July1st to 15thNight
22%7%15%31%18%2
1395
16th to endNight
16%5%14%32%28%2
1468
August1st to 15thNight
16%411%32%28%6%
1475
16th to endNight
25%6%14%28%18%4
1671
September1st to 15thNight
31%5%11%20%20%10%
1815
16th to endNight
23%48%25%26%11%
1815
October1st to 15thNight
29%39%19%20%16%
1917
16th to endNight
23%25%19%30%17%
2112
November1st to 15thNight
26%38%25%24%11%
2112
16th to endNight
32%36%18%28%10%
2340
December1st to 15thNight
34%49%22%21%7%
2340
16th to endNight
37%38%19%23%7%
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
23%14%31%23%6%1
90
16th to endDay
13%15%36%18%14%1
96
February1st to 15thDay
10%13%46%23%6%
90
16th to endDay
18%16%34%24%41
81
March1st to 15thDay
24%17%28%23%5%
90
16th to endDay
13%15%34%26%7%3
96
April1st to 15thDay
18%9%29%34%8%
132
16th to endDay
19%12%35%23%7%2
335
May1st to 15thDay
19%10%36%23%8%1
393
16th to endDay
14%7%32%25%17%2
437
June1st to 15thDay
9%218%35%25%8%
420
16th to endDay
7%115%32%30%11%
420
July1st to 15thDay
5%112%43%30%6%
400
16th to endDay
35%25%46%18%
445
August1st to 15thDay
37%34%41%12%
418
16th to endDay
11%5%32%36%12%
343
September1st to 15thDay
21422%43%26%
90
16th to endDay
8%15%30%34%20%
90
October1st to 15thDay
6%215%37%26%11%
90
16th to endDay
14%6%10%40%25%3
96
November1st to 15thDay
20%318%30%27%
90
16th to endDay
27%16%28%16%7%2
90
December1st to 15thDay
18%5%34%25%14%1
90
16th to endDay
20%13%36%22%6%
96
January1st to 15thNight
13%16%31%30%7%
900
16th to endNight
13%13%35%30%7%
960
February1st to 15thNight
16%15%33%29%4
824
16th to endNight
17%12%42%23%3
599
March1st to 15thNight
16%12%36%28%5%
540
16th to endNight
17%10%37%27%6%
576
April1st to 15thNight
11%13%41%27%6%
539
16th to endNight
14%8%38%29%8%
537
May1st to 15thNight
13%6%40%30%8%
495
16th to endNight
7%233%34%20%2
515
June1st to 15thNight
5%219%44%25%2
495
16th to endNight
414%48%27%4
495
July1st to 15thNight
5%11%47%32%3
465
16th to endNight
35%38%46%6%
522
August1st to 15thNight
1443%43%6%
494
16th to endNight
6%7%40%40%4
525
September1st to 15thNight
11%112%33%37%2
495
16th to endNight
6%115%37%35%3
492
October1st to 15thNight
14%223%33%22%3
597
16th to endNight
12%7%30%31%16%1
704
November1st to 15thNight
10%9%28%35%14%
712
16th to endNight
18%10%31%28%11%
900
December1st to 15thNight
19%11%31%30%7%
900
16th to endNight
20%10%34%26%7%
960
Page generated at 2017-04-30 19:40:12. Version ac04

Copyright 2017 A. Danko


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