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 2018-03-11.

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%
16412
28%
49062
19%
16366
56%
16366
36%
27625

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
36%
974
30%
2522
12%
970
48%
970
37%
1479
January16th to endNight
36%
1040
33%
2704
13%
1040
48%
1040
38%
1591
February1st to 15thNight
32%
894
24%
2422
9%
890
41%
890
31%
1480
February16th to endNight
24%
648
28%
2014
9%
648
40%
648
27%
1184
March1st to 15thNight
31%
573
25%
2101
14%
573
44%
573
24%
1218
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%
540
25%
1728
17%
540
48%
540
31%
993
May1st to 15thNight
38%
540
22%
1620
13%
540
51%
540
30%
992
May16th to endNight
50%
563
27%
1684
21%
561
62%
561
37%
969
June1st to 15thNight
68%
540
23%
1620
23%
540
72%
540
45%
861
June16th to endNight
76%
540
25%
1620
26%
540
79%
540
48%
825
July1st to 15thNight
75%
510
21%
1530
22%
510
76%
510
42%
820
July16th to endNight
87%
564
30%
1594
36%
531
88%
531
54%
773
August1st to 15thNight
87%
539
34%
1610
40%
536
87%
536
52%
777
August16th to endNight
76%
573
27%
1824
31%
573
78%
573
38%
998
September1st to 15thNight
67%
540
25%
1980
30%
540
70%
540
33%
1053
September16th to endNight
70%
537
35%
1980
36%
537
75%
537
40%
962
October1st to 15thNight
54%
651
32%
2091
23%
651
62%
651
38%
1129
October16th to endNight
48%
768
37%
2304
21%
768
60%
768
46%
1152
November1st to 15thNight
47%
773
29%
2293
17%
773
57%
773
38%
1246
November16th to endNight
38%
975
33%
2535
16%
975
48%
975
37%
1520
December1st to 15thNight
36%
975
28%
2535
13%
975
46%
975
35%
1562
December16th to endNight
31%
1040
26%
2704
11%
1040
42%
1040
31%
1751

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%424424446%49%
49563
Night
10%413323346%55%
49258
TransparencyDay
34%5%11%22%20%5%
49263
Night
29%49%23%23%8%
49063
SeeingDay
11%5%21%29%24%7%
6191
Night
12%7%27%33%17%1
16413

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%24212335%54%
1746
16th to endDay
13%5%13323245%55%
1872
February1st to 15thDay
14%5%25%42433449%
1782
16th to endDay
20%6%3422233446%
1746
March1st to 15thDay
17%6%23424335%46%
2095
16th to endDay
17%7%35%42333442%
2110
April1st to 15thDay
13%5%23413346%49%
2013
16th to endDay
14%5%26%425%346%43%
2229
May1st to 15thDay
16%6%35%424345%43%
2331
16th to endDay
10%6%25%5%46%5%5%7%40%
2430
June1st to 15thDay
7%425%5%35%5%5%9%46%
2340
16th to endDay
6%323435%6%6%9%49%
2340
July1st to 15thDay
6%4245%46%7%7%9%42%
2340
16th to endDay
4113435%5%7%10%50%
2466
August1st to 15thDay
3212435%5%6%9%54%
2340
16th to endDay
6%3246%35%7%7%10%42%
2373
September1st to 15thDay
11%32343445%7%48%
1980
16th to endDay
8%313324437%56%
1980
October1st to 15thDay
11%413423445%54%
1856
16th to endDay
10%31331223464%
1920
November1st to 15thDay
11%424314345%54%
1892
16th to endDay
15%422213235%57%
1755
December1st to 15thDay
16%6%23212335%50%
1755
16th to endDay
19%7%24312335%45%
1872
January1st to 15thNight
10%413313445%57%
2522
16th to endNight
10%423312335%58%
2704
February1st to 15thNight
13%6%1432334452%
2412
16th to endNight
14%6%23323245%51%
2014
March1st to 15thNight
15%5%24322345%48%
2101
16th to endNight
13%5%34413346%49%
2112
April1st to 15thNight
10%325%333347%52%
1935
16th to endNight
12%424413246%53%
1728
May1st to 15thNight
10%5%23424447%49%
1619
16th to endNight
6%31442445%9%53%
1683
June1st to 15thNight
431231345%7%61%
1620
16th to endNight
421222445%10%60%
1620
July1st to 15thNight
42223245%6%12%52%
1620
16th to endNight
31221346%10%61%
1702
August1st to 15thNight
2122235%6%9%61%
1620
16th to endNight
43234245%5%11%51%
1824
September1st to 15thNight
10%42332345%6%54%
1980
16th to endNight
6%31332335%7%59%
1980
October1st to 15thNight
10%423323345%58%
2091
16th to endNight
10%212221235%66%
2304
November1st to 15thNight
8%313323346%59%
2293
16th to endNight
13%423313225%57%
2535
December1st to 15thNight
14%5%23313346%52%
2535
16th to endNight
16%6%24322335%49%
2704

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
33%38%22%25%6%
1747
16th to endDay
32%36%23%26%7%
1872
February1st to 15thDay
38%49%21%22%4
1783
16th to endDay
43%36%19%20%7%
1746
March1st to 15thDay
40%49%20%17%8%
2095
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%
2229
May1st to 15thDay
43%5%9%16%21%3
2331
16th to endDay
41%7%11%20%16%1
2434
June1st to 15thDay
35%6%12%25%17%1
2340
16th to endDay
29%7%14%24%21%2
2340
July1st to 15thDay
34%9%17%25%12%
2201
16th to endDay
23%9%18%29%17%1
2311
August1st to 15thDay
21%9%15%26%24%2
2326
16th to endDay
34%9%15%24%11%3
2373
September1st to 15thDay
34%6%12%21%16%8%
1980
16th to endDay
27%5%10%23%25%7%
1980
October1st to 15thDay
32%411%19%19%13%
1856
16th to endDay
25%37%19%31%12%
1920
November1st to 15thDay
32%410%23%22%7%
1892
16th to endDay
31%26%19%31%9%
1755
December1st to 15thDay
37%38%25%20%5%
1755
16th to endDay
41%37%22%19%5%
1872
January1st to 15thNight
29%38%21%28%7%
2522
16th to endNight
29%36%20%28%10%
2704
February1st to 15thNight
35%38%22%21%7%
2422
16th to endNight
35%47%22%20%9%
2014
March1st to 15thNight
38%37%19%19%11%
2101
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%
1728
May1st to 15thNight
36%5%11%18%19%8%
1620
16th to endNight
27%7%15%28%16%4
1685
June1st to 15thNight
21%7%11%32%24%3
1620
16th to endNight
20%5%13%28%26%5%
1620
July1st to 15thNight
23%7%15%32%18%2
1530
16th to endNight
16%5%14%32%27%2
1594
August1st to 15thNight
17%5%12%31%26%6%
1610
16th to endNight
26%7%14%28%17%4
1824
September1st to 15thNight
29%5%10%22%21%10%
1980
16th to endNight
24%49%25%25%10%
1980
October1st to 15thNight
28%310%20%20%16%
2091
16th to endNight
22%35%19%31%18%
2304
November1st to 15thNight
27%39%24%24%10%
2293
16th to endNight
31%36%19%29%10%
2535
December1st to 15thNight
33%49%22%21%8%
2535
16th to endNight
38%38%19%22%7%
2704

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
20%13%32%27%5%
135
16th to endDay
11%16%35%22%11%2
144
February1st to 15thDay
14%14%40%25%5%
135
16th to endDay
33%12%30%18%4
120
March1st to 15thDay
22%19%33%19%4
121
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
339
May1st to 15thDay
17%10%36%23%10%2
468
16th to endDay
13%7%35%25%16%2
517
June1st to 15thDay
9%218%35%25%8%
495
16th to endDay
7%114%33%31%10%
495
July1st to 15thDay
5%111%39%31%9%
475
16th to endDay
25%22%46%21%
515
August1st to 15thDay
5%7%32%42%12%
493
16th to endDay
9%5%35%36%12%
413
September1st to 15thDay
2420%43%28%
135
16th to endDay
11%7%33%33%14%
135
October1st to 15thDay
6%316%34%29%9%
135
16th to endDay
12%7%15%36%25%2
144
November1st to 15thDay
22%225%27%18%2
135
16th to endDay
19%13%28%25%11%1
135
December1st to 15thDay
16%8%33%28%12%
135
16th to endDay
24%11%35%24%4
144
January1st to 15thNight
13%16%31%30%8%
975
16th to endNight
13%13%35%30%7%
1040
February1st to 15thNight
16%14%34%30%4
894
16th to endNight
19%12%41%23%3
648
March1st to 15thNight
16%11%36%28%5%
573
16th to endNight
17%10%37%27%6%
576
April1st to 15thNight
11%13%41%27%6%
539
16th to endNight
14%8%38%28%8%
540
May1st to 15thNight
12%6%39%31%10%
540
16th to endNight
7%333%35%19%2
563
June1st to 15thNight
5%219%44%25%3
540
16th to endNight
413%48%27%4
540
July1st to 15thNight
410%46%34%3
510
16th to endNight
3437%47%7%
564
August1st to 15thNight
3442%43%5%
539
16th to endNight
6%7%40%40%4
573
September1st to 15thNight
11%112%32%40%2
540
16th to endNight
6%15%38%35%3
537
October1st to 15thNight
13%223%33%23%2
651
16th to endNight
11%7%30%32%16%1
768
November1st to 15thNight
10%9%29%35%13%
773
16th to endNight
17%10%31%28%12%
975
December1st to 15thNight
18%11%31%30%8%
975
16th to endNight
21%10%34%27%7%
1040
Page generated at 2018-03-12 12:28:07. Version ac04

Copyright 2018 A. Danko


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