Keota Star Party
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Keota Star Party clear sky chart from 2005-11-05 to 2017-09-23.

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
48%
15997
25%
46920
16%
15954
57%
15954
36%
26928

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
43%
899
28%
2506
16%
895
53%
895
39%
1407
January16th to endNight
36%
873
29%
2601
15%
873
50%
873
38%
1438
February1st to 15thNight
36%
700
22%
2223
10%
697
49%
697
29%
1317
February16th to endNight
34%
632
28%
1894
13%
632
47%
632
33%
1082
March1st to 15thNight
46%
720
26%
2160
15%
720
56%
720
37%
1224
March16th to endNight
39%
648
22%
1995
12%
648
49%
648
31%
1171
April1st to 15thNight
35%
539
20%
1798
12%
539
47%
539
27%
1061
April16th to endNight
33%
540
19%
1788
14%
540
43%
540
23%
1129
May1st to 15thNight
45%
540
18%
1585
14%
540
50%
540
27%
1024
May16th to endNight
45%
561
16%
1498
10%
561
50%
561
28%
1003
June1st to 15thNight
56%
540
16%
1440
9%
540
61%
540
38%
864
June16th to endNight
65%
540
23%
1440
16%
540
68%
540
45%
804
July1st to 15thNight
66%
510
16%
1360
12%
510
68%
510
35%
855
July16th to endNight
72%
564
26%
1416
21%
531
73%
531
44%
802
August1st to 15thNight
66%
539
18%
1639
18%
536
68%
536
33%
975
August16th to endNight
67%
573
26%
1910
27%
573
72%
573
38%
994
September1st to 15thNight
61%
540
27%
1800
26%
540
68%
540
35%
984
September16th to endNight
63%
516
35%
1884
31%
516
73%
516
46%
839
October1st to 15thNight
47%
610
28%
1930
20%
610
55%
610
35%
1064
October16th to endNight
54%
778
33%
2186
19%
778
63%
778
46%
1167
November1st to 15thNight
51%
875
30%
2275
16%
875
58%
875
45%
1286
November16th to endNight
49%
900
33%
2384
17%
900
60%
900
45%
1330
December1st to 15thNight
38%
900
22%
2520
10%
900
49%
900
35%
1491
December16th to endNight
40%
960
26%
2688
12%
960
51%
960
32%
1617

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
6%42442445%8%52%
48005
Night
6%5%2442445%7%52%
47092
Cloud CoverDay
6%42442445%8%52%
48003
Night
6%5%2442445%7%52%
47092
TransparencyDay
29%411%26%19%7%
47679
Night
30%412%26%19%6%
46920
SeeingDay
10%6%26%30%20%5%
5937
Night
8%6%30%38%14%1
16004

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
26%34434437%56%
1432
16th to endDay
36%3442345%7%55%
1632
February1st to 15thDay
37%37%6%335%5%7%46%
1639
16th to endDay
26%26%42445%6%51%
1580
March1st to 15thDay
45%245%235%6%7%53%
1800
16th to endDay
8%7%245%245%6%8%44%
2226
April1st to 15thDay
9%6%24425%448%47%
2150
16th to endDay
13%7%24425%46%7%42%
2172
May1st to 15thDay
12%6%2442446%7%43%
2364
16th to endDay
9%5%24425%6%6%8%44%
2616
June1st to 15thDay
8%3133245%6%10%50%
2520
16th to endDay
22332345%9%61%
2520
July1st to 15thDay
6%313425%5%6%8%50%
2520
16th to endDay
3213435%6%7%9%51%
2656
August1st to 15thDay
4324425%6%8%10%47%
2309
16th to endDay
4223245%6%9%57%
2292
September1st to 15thDay
7%313322347%60%
2160
16th to endDay
5%212323246%65%
1911
October1st to 15thDay
10%423312346%58%
1698
16th to endDay
6%413212337%62%
1674
November1st to 15thDay
35%23324448%56%
1583
16th to endDay
342442335%6%59%
1575
December1st to 15thDay
46%38%434447%49%
1440
16th to endDay
5%7%45%5%3335%7%48%
1536
January1st to 15thNight
35%24323347%56%
2506
16th to endNight
35%25%323446%56%
2601
February1st to 15thNight
47%36%42446%7%48%
2213
16th to endNight
38%35%5%23346%53%
1894
March1st to 15thNight
35%25%42445%6%54%
2160
16th to endNight
7%6%243335%5%7%49%
1995
April1st to 15thNight
9%7%344235%5%7%47%
1798
16th to endNight
15%8%24423447%42%
1788
May1st to 15thNight
14%5%243236%5%7%43%
1584
16th to endNight
10%5%25%6%25%46%8%41%
1497
June1st to 15thNight
6%314325%48%10%49%
1440
16th to endNight
321333445%8%57%
1440
July1st to 15thNight
7%325%5%35%6%5%7%47%
1440
16th to endNight
4213325%6%8%10%51%
1512
August1st to 15thNight
43345%36%6%7%9%45%
1647
16th to endNight
5%31342445%8%56%
1910
September1st to 15thNight
8%32342445%8%52%
1800
16th to endNight
431232345%6%63%
1884
October1st to 15thNight
10%423413346%55%
1930
16th to endNight
7%413212346%61%
2186
November1st to 15thNight
4424323437%59%
2275
16th to endNight
35%23423447%58%
2384
December1st to 15thNight
46%35%5%2445%7%50%
2520
16th to endNight
5%7%345%23447%50%
2688

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
26%34434336%56%
1432
16th to endDay
25%3342346%7%55%
1632
February1st to 15thDay
27%37%6%3445%6%46%
1639
16th to endDay
26%26%435%5%5%6%51%
1580
March1st to 15thDay
44244245%6%7%53%
1800
16th to endDay
8%7%244345%5%8%44%
2224
April1st to 15thDay
9%6%245%25%447%47%
2150
16th to endDay
13%7%244245%5%7%41%
2172
May1st to 15thDay
12%5%2443446%8%43%
2364
16th to endDay
9%5%24425%6%6%8%43%
2616
June1st to 15thDay
7%31342447%9%50%
2520
16th to endDay
221232346%9%61%
2520
July1st to 15thDay
6%314425%5%6%8%50%
2520
16th to endDay
3214426%6%8%9%50%
2656
August1st to 15thDay
43145%25%6%8%10%47%
2309
16th to endDay
5%2123145%6%8%57%
2292
September1st to 15thDay
7%313323347%59%
2160
16th to endDay
5%312322237%65%
1911
October1st to 15thDay
9%413323247%57%
1698
16th to endDay
6%413212336%62%
1674
November1st to 15thDay
35%23424447%57%
1583
16th to endDay
341432335%6%59%
1575
December1st to 15thDay
46%37%5%23447%49%
1440
16th to endDay
5%7%45%5%3435%7%48%
1536
January1st to 15thNight
35%25%323447%56%
2506
16th to endNight
35%25%414446%56%
2601
February1st to 15thNight
37%36%43446%7%48%
2213
16th to endNight
37%35%5%3345%5%53%
1894
March1st to 15thNight
35%25%33445%6%54%
2160
16th to endNight
7%6%2443445%7%49%
1995
April1st to 15thNight
9%7%3442345%6%47%
1798
16th to endNight
15%8%24424446%42%
1788
May1st to 15thNight
13%5%243345%6%8%42%
1584
16th to endNight
10%6%25%5%35%46%8%41%
1497
June1st to 15thNight
6%31432447%10%49%
1440
16th to endNight
231332445%9%57%
1440
July1st to 15thNight
6%325%5%35%6%5%8%46%
1440
16th to endNight
4212425%5%8%10%51%
1512
August1st to 15thNight
4325%5%36%6%7%8%45%
1647
16th to endNight
432432445%7%56%
1910
September1st to 15thNight
8%32342345%8%52%
1800
16th to endNight
4312224347%63%
1884
October1st to 15thNight
10%324323337%54%
1930
16th to endNight
7%413212346%61%
2186
November1st to 15thNight
4414323447%59%
2275
16th to endNight
35%23324447%58%
2384
December1st to 15thNight
46%35%5%2345%8%50%
2520
16th to endNight
5%8%3443345%6%50%
2688

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
30%214%33%15%2
1433
16th to endDay
26%315%30%18%4
1632
February1st to 15thDay
37%413%32%10%3
1640
16th to endDay
32%310%31%18%3
1580
March1st to 15thDay
28%5%13%26%22%4
1800
16th to endDay
36%5%13%24%14%5%
2226
April1st to 15thDay
34%412%25%15%6%
2150
16th to endDay
40%5%11%23%15%3
2172
May1st to 15thDay
38%5%11%27%14%1
2364
16th to endDay
35%7%15%23%12%4
2620
June1st to 15thDay
28%5%15%23%19%7%
2520
16th to endDay
19%5%9%26%27%12%
2520
July1st to 15thDay
29%5%10%23%18%12%
2371
16th to endDay
25%6%11%27%20%8%
2489
August1st to 15thDay
29%6%15%23%16%10%
2293
16th to endDay
22%48%26%27%10%
2292
September1st to 15thDay
25%37%24%24%14%
2160
16th to endDay
21%36%25%35%7%
1911
October1st to 15thDay
27%411%23%25%7%
1698
16th to endDay
24%210%31%22%8%
1674
November1st to 15thDay
26%312%26%21%9%
1583
16th to endDay
25%29%29%26%6%
1575
December1st to 15thDay
34%412%31%13%2
1440
16th to endDay
35%413%26%15%3
1536
January1st to 15thNight
27%314%28%21%3
2506
16th to endNight
29%311%27%24%4
2601
February1st to 15thNight
34%5%13%29%13%3
2223
16th to endNight
32%210%26%20%6%
1894
March1st to 15thNight
30%49%26%23%5%
2160
16th to endNight
32%5%14%23%20%3
1995
April1st to 15thNight
35%5%12%26%16%4
1798
16th to endNight
41%5%9%23%16%2
1788
May1st to 15thNight
38%7%14%24%13%1
1585
16th to endNight
38%8%17%20%9%5%
1498
June1st to 15thNight
28%7%20%24%12%7%
1440
16th to endNight
23%6%12%27%22%8%
1440
July1st to 15thNight
34%5%13%22%14%8%
1360
16th to endNight
25%5%13%28%19%7%
1416
August1st to 15thNight
32%6%15%22%14%7%
1639
16th to endNight
27%410%24%23%9%
1910
September1st to 15thNight
30%49%22%21%10%
1800
16th to endNight
20%38%31%27%8%
1884
October1st to 15thNight
31%312%21%23%7%
1930
16th to endNight
25%210%28%24%9%
2186
November1st to 15thNight
25%310%23%25%11%
2275
16th to endNight
25%39%28%25%7%
2384
December1st to 15thNight
32%314%31%14%3
2520
16th to endNight
33%414%28%16%2
2688

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
48%33%32%11%10%
90
16th to endDay
7%9%38%35%7%2
96
February1st to 15thDay
7%12%45%33%1
90
16th to endDay
7%9%38%25%18%
81
March1st to 15thDay
6%13%38%25%13%2
90
16th to endDay
16%13%34%27%6%
282
April1st to 15thDay
14%14%38%20%8%2
269
16th to endDay
22%20%27%18%9%
282
May1st to 15thDay
17%8%27%24%17%3
468
16th to endDay
17%9%23%25%18%5%
517
June1st to 15thDay
10%5%23%30%21%8%
495
16th to endDay
3325%37%24%4
495
July1st to 15thDay
11%115%32%32%6%
475
16th to endDay
316%33%35%10%
515
August1st to 15thDay
6%221%35%26%6%
364
16th to endDay
4320%37%26%7%
332
September1st to 15thDay
8%327%29%21%9%
315
16th to endDay
7%327%24%24%13%
129
October1st to 15thDay
13%220%33%24%6%
90
16th to endDay
10%225%37%10%14%
96
November1st to 15thDay
3323%26%23%20%
90
16th to endDay
20%11%30%25%11%2
90
December1st to 15thDay
7%6%46%28%10%
90
16th to endDay
11%9%39%32%7%
96
January1st to 15thNight
6%9%35%35%11%2
900
16th to endNight
6%8%43%32%8%1
873
February1st to 15thNight
8%7%41%35%6%
704
16th to endNight
7%10%41%34%6%
632
March1st to 15thNight
5%7%36%39%10%
720
16th to endNight
9%9%35%34%8%
648
April1st to 15thNight
13%9%36%32%6%
539
16th to endNight
19%11%30%29%9%
540
May1st to 15thNight
16%5%28%34%14%
540
16th to endNight
14%430%33%16%1
563
June1st to 15thNight
7%427%42%16%1
540
16th to endNight
4123%52%16%
540
July1st to 15thNight
9%14%46%27%1
510
16th to endNight
6%113%43%32%1
564
August1st to 15thNight
6%115%46%29%1
539
16th to endNight
7%118%43%27%1
573
September1st to 15thNight
10%219%41%21%3
540
16th to endNight
6%225%42%22%1
516
October1st to 15thNight
14%6%27%31%17%1
610
16th to endNight
9%6%26%39%16%1
778
November1st to 15thNight
6%7%29%41%13%2
875
16th to endNight
6%7%31%42%11%1
900
December1st to 15thNight
8%8%39%35%6%
900
16th to endNight
8%9%33%38%8%
960
Page generated at 2017-09-24 07:15:49. Version ac04

Copyright 2017 A. Danko


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