Council Grove Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Council Grove Lake clear sky chart from 2005-11-05 to 2017-09-21.

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
41%
15896
24%
46955
14%
15850
51%
15850
34%
27218

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
33%
900
25%
2327
9%
895
44%
895
35%
1415
January16th to endNight
31%
960
29%
2496
10%
960
42%
960
37%
1485
February1st to 15thNight
26%
880
17%
2288
6%
876
34%
876
27%
1529
February16th to endNight
28%
632
27%
1894
8%
632
43%
632
30%
1102
March1st to 15thNight
34%
555
22%
1995
13%
555
46%
555
26%
1128
March16th to endNight
27%
576
18%
2112
11%
576
36%
576
20%
1307
April1st to 15thNight
30%
539
20%
1911
12%
539
45%
539
27%
1073
April16th to endNight
30%
540
21%
1626
13%
540
43%
540
27%
1022
May1st to 15thNight
37%
539
20%
1620
15%
539
46%
539
27%
1014
May16th to endNight
45%
562
18%
1684
14%
561
51%
561
34%
986
June1st to 15thNight
53%
540
18%
1620
10%
540
58%
540
39%
900
June16th to endNight
56%
540
23%
1620
14%
540
62%
540
48%
825
July1st to 15thNight
66%
510
18%
1530
15%
510
68%
510
42%
820
July16th to endNight
70%
564
23%
1594
24%
531
73%
531
41%
877
August1st to 15thNight
71%
539
22%
1610
24%
536
74%
536
39%
902
August16th to endNight
67%
573
29%
1758
29%
573
72%
573
42%
931
September1st to 15thNight
58%
540
23%
1948
24%
540
63%
540
32%
1060
September16th to endNight
58%
510
31%
1881
27%
510
68%
510
36%
932
October1st to 15thNight
43%
605
28%
1925
21%
605
50%
605
31%
1126
October16th to endNight
40%
704
31%
2112
15%
704
52%
704
43%
1100
November1st to 15thNight
43%
828
30%
2228
13%
828
54%
828
44%
1205
November16th to endNight
35%
900
28%
2340
10%
900
47%
900
39%
1348
December1st to 15thNight
30%
900
23%
2340
8%
900
41%
900
31%
1493
December16th to endNight
32%
960
25%
2496
11%
960
42%
960
29%
1638

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
10%5%25%42445%7%47%
47909
Night
8%5%24424447%51%
47151
Cloud CoverDay
10%5%25%42445%7%47%
47907
Night
8%5%24424447%51%
47151
TransparencyDay
35%5%13%26%16%3
47607
Night
32%413%27%18%4
46956
SeeingDay
11%8%27%32%17%2
5904
Night
11%9%32%33%12%
15898

By Month

Percentage Cloud Cover SW (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
9%6%14435%35%6%49%
1611
16th to endDay
8%6%27%423446%48%
1728
February1st to 15thDay
7%8%39%6%24446%42%
1584
16th to endDay
7%7%45%5%14347%47%
1580
March1st to 15thDay
11%7%345%25%45%7%42%
1965
16th to endDay
18%9%34423335%40%
2112
April1st to 15thDay
14%7%24434446%44%
2037
16th to endDay
16%7%26%5%34346%38%
2331
May1st to 15thDay
14%7%35%43435%6%40%
2331
16th to endDay
11%7%36%6%25%5%5%7%39%
2430
June1st to 15thDay
8%425%43445%7%49%
2340
16th to endDay
42124346%6%9%54%
2340
July1st to 15thDay
8%324425%5%6%9%45%
2340
16th to endDay
6%2145%25%6%7%9%49%
2466
August1st to 15thDay
6%4244345%5%9%48%
2340
16th to endDay
6%42443445%7%51%
2444
September1st to 15thDay
11%5%2443345%6%48%
2010
16th to endDay
7%42442435%8%53%
1871
October1st to 15thDay
12%414323345%52%
1694
16th to endDay
10%5%13212346%56%
1760
November1st to 15thDay
6%323323447%58%
1627
16th to endDay
11%423322245%56%
1620
December1st to 15thDay
12%7%26%42335%7%43%
1620
16th to endDay
11%8%37%5%24337%42%
1728
January1st to 15thNight
7%5%245%14345%53%
2327
16th to endNight
7%424424345%55%
2496
February1st to 15thNight
8%9%36%5%24446%43%
2278
16th to endNight
9%5%2442445%5%51%
1894
March1st to 15thNight
8%7%34425%45%7%47%
1995
16th to endNight
16%8%244235%45%42%
2112
April1st to 15thNight
10%42442335%7%50%
1911
16th to endNight
14%7%25%423447%44%
1626
May1st to 15thNight
12%7%25%5%23447%44%
1619
16th to endNight
9%42432446%10%46%
1683
June1st to 15thNight
5%41432445%10%53%
1620
16th to endNight
411233445%10%59%
1620
July1st to 15thNight
5%31332446%10%52%
1620
16th to endNight
4214435%46%9%52%
1702
August1st to 15thNight
4324435%46%9%52%
1620
16th to endNight
6%31441335%6%58%
1758
September1st to 15thNight
9%42432345%8%50%
1948
16th to endNight
6%323424436%58%
1881
October1st to 15thNight
12%5%24423335%52%
1925
16th to endNight
8%313223345%62%
2112
November1st to 15thNight
5%423223347%61%
2228
16th to endNight
11%422213345%58%
2340
December1st to 15thNight
11%6%35%32435%6%46%
2340
16th to endNight
11%7%47%422447%44%
2496

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
9%6%1444435%6%49%
1611
16th to endDay
9%6%37%423446%48%
1728
February1st to 15thDay
7%8%39%6%24445%42%
1584
16th to endDay
7%7%35%5%1435%7%47%
1580
March1st to 15thDay
11%7%25%5%25%5%5%7%42%
1965
16th to endDay
18%8%35%422335%40%
2110
April1st to 15thDay
14%6%24424446%44%
2037
16th to endDay
16%7%35%6%3345%6%38%
2331
May1st to 15thDay
14%7%345%3435%6%40%
2331
16th to endDay
11%7%36%5%245%5%7%39%
2430
June1st to 15thDay
8%425%43445%7%49%
2340
16th to endDay
4212325%5%5%9%54%
2340
July1st to 15thDay
8%3145%25%5%7%9%45%
2340
16th to endDay
6%2145%25%6%7%9%49%
2466
August1st to 15thDay
6%4245%345%5%9%48%
2340
16th to endDay
6%4245%3445%7%51%
2444
September1st to 15thDay
11%5%2443345%6%48%
2010
16th to endDay
6%41442435%7%53%
1871
October1st to 15thDay
12%424323346%52%
1694
16th to endDay
10%5%13313246%56%
1760
November1st to 15thDay
6%323323447%58%
1627
16th to endDay
11%5%23312245%57%
1620
December1st to 15thDay
12%7%26%42335%7%43%
1620
16th to endDay
11%7%47%5%33336%42%
1728
January1st to 15thNight
7%5%245%14345%53%
2327
16th to endNight
7%424424345%55%
2496
February1st to 15thNight
8%10%36%5%24446%43%
2278
16th to endNight
9%424424446%51%
1894
March1st to 15thNight
8%7%34425%45%7%47%
1995
16th to endNight
16%8%24423445%42%
2112
April1st to 15thNight
10%424423447%50%
1911
16th to endNight
14%7%2442345%7%44%
1626
May1st to 15thNight
12%7%35%423447%44%
1619
16th to endNight
9%42433346%10%46%
1683
June1st to 15thNight
5%32332446%9%54%
1620
16th to endNight
411233446%10%59%
1620
July1st to 15thNight
5%31342446%10%52%
1620
16th to endNight
421433446%9%52%
1702
August1st to 15thNight
422443436%9%53%
1620
16th to endNight
5%324423446%58%
1758
September1st to 15thNight
9%4244235%5%7%50%
1948
16th to endNight
6%423424435%58%
1881
October1st to 15thNight
12%5%25%323335%52%
1925
16th to endNight
8%31222334462%
2112
November1st to 15thNight
6%413313347%61%
2228
16th to endNight
11%423213346%57%
2340
December1st to 15thNight
11%6%35%32435%6%46%
2340
16th to endNight
11%7%47%423447%43%
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
35%314%27%16%2
1612
16th to endDay
36%316%26%14%2
1728
February1st to 15thDay
42%5%14%24%9%2
1585
16th to endDay
36%313%27%15%3
1580
March1st to 15thDay
40%411%24%16%2
1965
16th to endDay
46%412%23%9%2
2112
April1st to 15thDay
41%412%24%16%
2037
16th to endDay
46%5%10%25%11%
2331
May1st to 15thDay
43%412%23%14%1
2331
16th to endDay
43%5%15%22%10%1
2434
June1st to 15thDay
32%7%13%28%15%2
2340
16th to endDay
24%5%16%30%20%2
2340
July1st to 15thDay
32%7%13%28%13%3
2201
16th to endDay
26%6%15%31%16%3
2311
August1st to 15thDay
30%7%14%26%17%3
2326
16th to endDay
30%6%11%27%16%6%
2444
September1st to 15thDay
35%5%14%22%15%7%
2010
16th to endDay
29%411%30%21%2
1871
October1st to 15thDay
32%311%22%24%4
1694
16th to endDay
29%312%26%23%5%
1760
November1st to 15thDay
25%411%27%22%7%
1627
16th to endDay
31%210%33%20%2
1620
December1st to 15thDay
39%414%28%12%
1620
16th to endDay
44%312%24%13%2
1728
January1st to 15thNight
32%314%26%20%2
2327
16th to endNight
31%314%28%18%3
2496
February1st to 15thNight
41%413%24%12%2
2288
16th to endNight
32%5%12%26%18%3
1894
March1st to 15thNight
35%412%23%17%6%
1995
16th to endNight
43%412%23%13%2
2112
April1st to 15thNight
33%411%24%23%2
1911
16th to endNight
38%5%12%24%16%2
1626
May1st to 15thNight
39%413%23%17%1
1620
16th to endNight
32%5%22%23%14%1
1685
June1st to 15thNight
26%5%17%31%15%3
1620
16th to endNight
19%6%13%35%20%3
1620
July1st to 15thNight
25%5%16%30%18%4
1530
16th to endNight
25%6%14%29%20%2
1594
August1st to 15thNight
26%7%15%30%14%5%
1610
16th to endNight
26%410%29%22%6%
1758
September1st to 15thNight
31%413%24%17%8%
1948
16th to endNight
27%311%28%25%4
1881
October1st to 15thNight
35%38%23%22%6%
1925
16th to endNight
24%310%29%27%5%
2112
November1st to 15thNight
24%311%28%23%9%
2228
16th to endNight
28%310%32%19%4
2340
December1st to 15thNight
37%313%29%15%
2340
16th to endNight
40%413%22%15%3
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
20%13%42%18%5%
90
16th to endDay
15%17%37%26%21
96
February1st to 15thDay
423%45%20%6%
90
16th to endDay
8%18%50%9%11%1
81
March1st to 15thDay
17%18%44%16%2
90
16th to endDay
23%18%32%21%3
96
April1st to 15thDay
21%16%26%26%8%
156
16th to endDay
19%15%39%17%7%1
441
May1st to 15thDay
16%13%33%23%11%1
468
16th to endDay
18%9%33%24%11%2
517
June1st to 15thDay
7%5%29%37%16%2
495
16th to endDay
5%432%38%15%2
495
July1st to 15thDay
11%217%41%23%4
475
16th to endDay
5%12%42%34%3
515
August1st to 15thDay
7%116%41%31%2
493
16th to endDay
9%316%35%28%5%
484
September1st to 15thDay
6%120%46%20%4
165
16th to endDay
9%221%41%17%6%
105
October1st to 15thDay
5%8%32%32%12%8%
90
16th to endDay
6%11%39%28%13%1
96
November1st to 15thDay
8%227%41%15%4
90
16th to endDay
31%15%34%14%4
90
December1st to 15thDay
13%17%43%20%23
90
16th to endDay
20%19%34%20%4
96
January1st to 15thNight
10%13%38%30%7%
900
16th to endNight
9%13%41%30%5%
960
February1st to 15thNight
13%12%41%29%3
880
16th to endNight
11%16%39%27%3
632
March1st to 15thNight
12%10%38%30%6%
555
16th to endNight
21%13%36%23%5%
576
April1st to 15thNight
13%16%37%26%5%
539
16th to endNight
19%11%35%26%6%
540
May1st to 15thNight
17%11%30%31%9%
540
16th to endNight
12%7%32%30%15%1
563
June1st to 15thNight
5%5%30%41%16%
540
16th to endNight
4233%45%14%
540
July1st to 15thNight
7%216%50%20%2
510
16th to endNight
5%15%46%29%1
564
August1st to 15thNight
5%12%50%28%1
539
16th to endNight
8%215%38%31%3
573
September1st to 15thNight
12%222%37%22%2
540
16th to endNight
8%5%22%38%22%2
510
October1st to 15thNight
16%5%30%30%15%1
605
16th to endNight
10%8%39%28%13%
704
November1st to 15thNight
8%11%33%33%12%
828
16th to endNight
13%13%36%30%6%
900
December1st to 15thNight
15%11%37%28%5%
900
16th to endNight
14%11%35%32%6%
960
Page generated at 2017-09-22 06:35:34. Version ac04

Copyright 2017 A. Danko


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