Kenockee Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kenockee Observatory clear sky chart from 2005-11-05 to 2017-10-31.

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
36%
15626
15%
47321
9%
15588
42%
15588
20%
32642

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
16%
897
10%
2506
2%
895
22%
895
12%
1982
January16th to endNight
19%
824
10%
2552
4%
824
26%
824
12%
1985
February1st to 15thNight
16%
701
10%
2287
2%
701
25%
701
11%
1748
February16th to endNight
23%
631
13%
1898
5%
631
31%
631
14%
1410
March1st to 15thNight
26%
720
14%
2057
8%
720
30%
720
17%
1503
March16th to endNight
35%
768
17%
2112
10%
768
40%
768
23%
1477
April1st to 15thNight
29%
617
15%
1812
8%
617
36%
617
21%
1261
April16th to endNight
38%
540
20%
1620
9%
540
47%
540
25%
1048
May1st to 15thNight
42%
540
14%
1620
9%
540
47%
540
22%
1114
May16th to endNight
48%
525
16%
1648
13%
525
55%
525
29%
1004
June1st to 15thNight
53%
360
16%
1281
16%
360
60%
360
27%
756
June16th to endNight
59%
360
18%
1260
18%
360
65%
360
31%
722
July1st to 15thNight
66%
487
17%
1337
16%
487
69%
487
41%
784
July16th to endNight
67%
564
16%
1524
13%
531
69%
531
37%
894
August1st to 15thNight
66%
539
17%
1609
14%
536
67%
536
35%
938
August16th to endNight
63%
573
23%
1719
17%
573
68%
573
35%
1013
September1st to 15thNight
55%
687
22%
1924
15%
687
60%
687
33%
1184
September16th to endNight
59%
717
23%
1980
17%
717
63%
717
33%
1233
October1st to 15thNight
45%
720
18%
2094
14%
720
50%
720
26%
1378
October16th to endNight
25%
768
14%
2381
8%
768
34%
768
16%
1717
November1st to 15thNight
34%
700
18%
2276
15%
700
40%
700
20%
1510
November16th to endNight
26%
720
12%
2475
8%
720
32%
720
14%
1778
December1st to 15thNight
14%
720
8%
2520
2%
720
21%
720
10%
1902
December16th to endNight
14%
948
8%
2829
1%
948
20%
948
10%
2301

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
13%8%37%6%35%5%5%7%33%
48418
Night
15%8%36%5%3445%6%35%
47501
Cloud CoverDay
14%8%36%6%35%5%5%7%33%
48428
Night
15%8%36%5%3445%6%35%
47505
TransparencyDay
48%6%12%20%10%1
48117
Night
47%5%12%21%10%1
47321
SeeingDay
16%7%27%25%16%7%
5968
Night
18%8%28%29%12%1
15634

By Month

Percentage Cloud Cover NE (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
16%13%6%11%8%35%435%20%
1432
16th to endDay
14%16%7%10%9%45%44415%
1671
February1st to 15thDay
15%13%6%11%9%35%5%5%6%18%
1575
16th to endDay
13%13%5%9%8%445%45%24%
1573
March1st to 15thDay
16%12%5%8%6%34446%26%
1891
16th to endDay
17%10%5%7%6%35%445%28%
2112
April1st to 15thDay
18%10%46%5%2345%7%30%
2145
16th to endDay
16%8%35%5%2445%6%36%
2340
May1st to 15thDay
18%6%37%5%34446%34%
2331
16th to endDay
14%5%35%5%25%46%8%39%
2467
June1st to 15thDay
9%5%26%5%35%5%7%8%39%
2676
16th to endDay
9%5%25%6%35%6%6%9%38%
2700
July1st to 15thDay
7%5%25%5%35%5%6%9%43%
2539
16th to endDay
9%425%5%35%6%7%9%38%
2537
August1st to 15thDay
8%5%25%6%46%6%6%8%37%
2340
16th to endDay
10%5%245%36%5%6%8%39%
2483
September1st to 15thDay
11%5%26%5%35%5%6%8%38%
2022
16th to endDay
12%5%26%5%2447%8%40%
1980
October1st to 15thDay
14%7%36%5%34446%38%
1866
16th to endDay
20%9%36%6%34345%31%
1842
November1st to 15thDay
14%7%37%5%3445%6%34%
1582
16th to endDay
15%11%5%7%8%45%446%25%
1485
December1st to 15thDay
16%12%6%10%8%35%446%21%
1440
16th to endDay
21%16%6%7%6%34345%19%
1389
January1st to 15thNight
22%12%5%8%6%34445%23%
2506
16th to endNight
13%14%8%9%6%45%445%23%
2552
February1st to 15thNight
14%14%5%9%6%35%45%5%25%
2285
16th to endNight
15%11%5%8%7%34446%27%
1898
March1st to 15thNight
17%10%46%6%34346%31%
2045
16th to endNight
16%8%45%5%35%46%5%36%
2112
April1st to 15thNight
20%8%35%423447%34%
1812
16th to endNight
14%6%25%5%2346%7%40%
1620
May1st to 15thNight
17%5%35%5%4446%7%35%
1620
16th to endNight
12%3244345%5%7%46%
1646
June1st to 15thNight
9%425%3246%7%9%43%
1281
16th to endNight
8%434435%45%10%46%
1260
July1st to 15thNight
6%42342445%9%52%
1417
16th to endNight
5%313435%5%6%9%51%
1629
August1st to 15thNight
6%415%5%245%7%11%46%
1620
16th to endNight
9%314434346%52%
1719
September1st to 15thNight
11%424424447%48%
1924
16th to endNight
10%425%5%235%5%6%47%
1980
October1st to 15thNight
16%6%245%3346%6%41%
2094
16th to endNight
21%7%35%6%35%45%6%31%
2381
November1st to 15thNight
14%7%35%435%5%5%6%37%
2276
16th to endNight
19%11%46%5%2445%6%28%
2475
December1st to 15thNight
19%13%5%7%6%345%45%25%
2520
16th to endNight
21%13%6%9%6%33445%19%
2829

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
16%14%6%10%8%45%445%20%
1432
16th to endDay
15%15%8%10%9%45%45%415%
1671
February1st to 15thDay
15%13%6%12%8%35%5%5%5%19%
1575
16th to endDay
13%13%5%10%9%35%445%24%
1573
March1st to 15thDay
16%12%49%7%34346%26%
1902
16th to endDay
17%11%5%7%6%35%5%45%27%
2111
April1st to 15thDay
18%11%45%5%2435%7%30%
2145
16th to endDay
16%8%35%5%2445%6%36%
2340
May1st to 15thDay
19%6%35%6%35%446%34%
2331
16th to endDay
15%5%25%5%25%45%7%40%
2467
June1st to 15thDay
10%5%26%5%35%5%7%8%40%
2676
16th to endDay
10%5%26%6%35%5%6%8%38%
2700
July1st to 15thDay
7%4345%25%6%7%8%44%
2539
16th to endDay
9%5%245%36%6%7%9%39%
2537
August1st to 15thDay
9%5%25%6%45%7%5%9%37%
2340
16th to endDay
11%425%6%26%5%6%8%39%
2483
September1st to 15thDay
11%5%25%5%36%5%6%8%39%
2022
16th to endDay
13%5%26%5%2447%8%40%
1980
October1st to 15thDay
14%7%36%6%24446%38%
1866
16th to endDay
21%9%36%6%33336%31%
1842
November1st to 15thDay
15%8%36%7%3445%6%34%
1582
16th to endDay
15%10%49%8%3445%6%26%
1485
December1st to 15thDay
16%12%6%8%8%36%445%22%
1440
16th to endDay
21%16%7%8%6%23445%19%
1389
January1st to 15thNight
22%11%5%8%7%34345%24%
2506
16th to endNight
14%13%8%9%6%45%345%23%
2552
February1st to 15thNight
14%14%6%9%6%35%445%25%
2278
16th to endNight
15%11%5%9%7%44445%27%
1898
March1st to 15thNight
17%10%46%5%35%345%31%
2057
16th to endNight
16%8%45%5%2445%5%36%
2112
April1st to 15thNight
20%8%35%5%24347%34%
1812
16th to endNight
15%6%2443345%8%40%
1620
May1st to 15thNight
17%5%26%5%35%36%7%35%
1619
16th to endNight
12%42443445%7%46%
1646
June1st to 15thNight
9%415%316%5%6%9%43%
1281
16th to endNight
8%425%425%45%9%46%
1260
July1st to 15thNight
6%42442445%8%53%
1417
16th to endNight
5%413335%5%5%9%51%
1629
August1st to 15thNight
6%315%4245%7%10%46%
1620
16th to endNight
8%414434346%52%
1719
September1st to 15thNight
12%424424447%48%
1924
16th to endNight
10%5%244245%47%48%
1980
October1st to 15thNight
16%5%25%43335%7%41%
2094
16th to endNight
21%7%26%6%345%46%31%
2381
November1st to 15thNight
14%8%36%335%45%6%37%
2276
16th to endNight
19%11%46%5%2445%7%27%
2475
December1st to 15thNight
19%12%6%7%6%25%45%5%24%
2520
16th to endNight
22%13%6%10%6%2345%5%20%
2829

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
66%5%10%13%4
1433
16th to endDay
70%410%10%4
1671
February1st to 15thDay
66%411%12%4
1577
16th to endDay
60%411%14%6%1
1573
March1st to 15thDay
59%5%13%13%7%
1902
16th to endDay
55%6%10%18%7%1
2112
April1st to 15thDay
52%5%10%19%10%
2145
16th to endDay
46%6%14%16%14%2
2340
May1st to 15thDay
49%5%10%21%10%2
2331
16th to endDay
42%6%11%23%14%1
2471
June1st to 15thDay
38%7%14%24%13%1
2676
16th to endDay
39%8%14%22%14%1
2700
July1st to 15thDay
33%6%11%28%17%1
2390
16th to endDay
36%9%16%21%13%2
2380
August1st to 15thDay
39%9%13%22%12%1
2327
16th to endDay
39%8%11%26%12%1
2483
September1st to 15thDay
40%7%15%24%11%
2022
16th to endDay
39%5%14%29%10%
1980
October1st to 15thDay
46%5%11%22%12%1
1866
16th to endDay
54%415%17%7%
1842
November1st to 15thDay
48%6%12%21%9%
1582
16th to endDay
57%5%14%15%5%
1485
December1st to 15thDay
63%5%14%12%4
1440
16th to endDay
67%5%12%11%3
1389
January1st to 15thNight
63%410%14%6%
2506
16th to endNight
62%5%13%15%3
2552
February1st to 15thNight
59%6%10%14%7%
2287
16th to endNight
58%411%18%6%
1898
March1st to 15thNight
54%5%11%20%7%1
2057
16th to endNight
47%5%11%24%10%
2112
April1st to 15thNight
49%411%20%12%1
1812
16th to endNight
40%6%10%19%17%3
1620
May1st to 15thNight
46%5%10%21%12%3
1620
16th to endNight
36%6%13%23%16%3
1648
June1st to 15thNight
34%7%14%27%15%1
1281
16th to endNight
33%6%15%23%19%1
1260
July1st to 15thNight
29%49%32%20%2
1337
16th to endNight
29%7%17%25%18%2
1524
August1st to 15thNight
29%7%16%30%13%2
1609
16th to endNight
32%5%11%31%16%2
1719
September1st to 15thNight
35%414%29%14%1
1924
16th to endNight
34%6%12%31%14%
1980
October1st to 15thNight
41%5%11%23%16%
2094
16th to endNight
52%5%13%20%7%
2381
November1st to 15thNight
45%6%13%23%9%1
2276
16th to endNight
55%5%15%17%6%
2475
December1st to 15thNight
60%5%15%13%5%
2520
16th to endNight
66%411%11%5%
2829

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
18%15%41%22%11
90
16th to endDay
31%14%35%15%3
96
February1st to 15thDay
22%15%46%15%
90
16th to endDay
13%23%39%18%4
81
March1st to 15thDay
28%13%30%20%6%
192
16th to endDay
24%5%33%23%10%2
288
April1st to 15thDay
25%11%28%22%10%2
270
16th to endDay
20%9%30%18%14%7%
270
May1st to 15thDay
22%5%30%21%15%4
288
16th to endDay
17%7%24%25%16%8%
331
June1st to 15thDay
11%6%32%30%14%4
471
16th to endDay
11%433%28%16%6%
495
July1st to 15thDay
9%422%34%18%11%
475
16th to endDay
9%221%32%23%10%
397
August1st to 15thDay
10%114%31%22%18%
313
16th to endDay
14%315%24%21%18%
332
September1st to 15thDay
13%219%17%29%17%
315
16th to endDay
13%416%22%26%16%
314
October1st to 15thDay
16%5%27%25%19%5%
315
16th to endDay
24%10%36%22%6%
258
November1st to 15thDay
12%14%31%27%13%1
90
16th to endDay
16%26%35%14%5%
67
December1st to 15thDay
30%20%31%16%1
60
16th to endDay
32%18%40%8%
70
January1st to 15thNight
27%13%34%18%41
900
16th to endNight
19%12%36%25%5%
824
February1st to 15thNight
21%13%39%21%3
704
16th to endNight
21%11%33%28%5%
631
March1st to 15thNight
20%11%35%26%6%
720
16th to endNight
20%7%30%30%9%1
768
April1st to 15thNight
23%11%31%27%5%
617
16th to endNight
17%435%29%10%2
540
May1st to 15thNight
17%5%26%36%12%1
540
16th to endNight
13%326%34%20%1
527
June1st to 15thNight
13%125%43%16%
360
16th to endNight
11%22%47%17%
360
July1st to 15thNight
10%114%42%26%4
487
16th to endNight
6%17%46%25%2
564
August1st to 15thNight
7%115%38%33%3
539
16th to endNight
10%216%35%30%4
573
September1st to 15thNight
12%420%31%24%5%
687
16th to endNight
13%317%34%25%5%
717
October1st to 15thNight
18%5%25%30%17%2
720
16th to endNight
24%12%32%24%5%
768
November1st to 15thNight
17%10%33%24%13%1
700
16th to endNight
25%13%28%22%8%
720
December1st to 15thNight
24%14%38%17%4
720
16th to endNight
29%11%35%21%2
948
Page generated at 2017-11-01 17:23:30. Version ac04

Copyright 2017 A. Danko


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