This page made possible by the sponsorship of: Dave Erickson.

Kennedy Meadows
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kennedy Meadows clear sky chart from 2005-11-05 to 2017-09-10.

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
61%
15531
36%
46756
25%
15493
72%
15493
57%
20447

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
54%
718
28%
2506
21%
716
68%
716
47%
1082
January16th to endNight
51%
768
35%
2463
25%
768
66%
768
43%
1165
February1st to 15thNight
51%
700
33%
2106
25%
698
64%
698
49%
987
February16th to endNight
49%
632
32%
1895
25%
632
62%
632
48%
906
March1st to 15thNight
47%
720
28%
2160
17%
720
63%
720
47%
1021
March16th to endNight
46%
768
33%
2005
16%
768
59%
768
49%
1016
April1st to 15thNight
42%
719
33%
1799
11%
719
55%
719
50%
921
April16th to endNight
47%
720
38%
1800
14%
720
59%
720
64%
833
May1st to 15thNight
49%
575
36%
1655
19%
575
59%
575
63%
701
May16th to endNight
51%
561
34%
1685
19%
561
62%
561
58%
702
June1st to 15thNight
61%
361
36%
1441
31%
361
77%
361
63%
477
June16th to endNight
68%
360
41%
1440
38%
360
83%
360
77%
425
July1st to 15thNight
85%
340
34%
1360
39%
340
91%
340
63%
466
July16th to endNight
87%
480
38%
1512
36%
450
89%
450
63%
612
August1st to 15thNight
83%
717
37%
1790
24%
713
85%
713
79%
805
August16th to endNight
86%
764
45%
1910
28%
764
88%
764
81%
863
September1st to 15thNight
85%
700
42%
1769
29%
700
89%
700
78%
798
September16th to endNight
78%
656
46%
1815
36%
656
87%
656
80%
729
October1st to 15thNight
66%
660
40%
1849
30%
660
77%
660
62%
845
October16th to endNight
67%
704
44%
2162
37%
704
81%
704
63%
885
November1st to 15thNight
66%
700
37%
2275
31%
700
79%
700
59%
933
November16th to endNight
64%
720
37%
2340
33%
720
74%
720
57%
971
December1st to 15thNight
55%
720
33%
2340
21%
720
70%
720
45%
1062
December16th to endNight
47%
768
31%
2679
21%
768
62%
768
37%
1242

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
1212213346%70%
47864
Night
111212346%73%
46944
TransparencyDay
14%27%18%27%28%
47545
Night
12%39%21%29%23%
46763
SeeingDay
7%19%38%25%6%2
5785
Night
38%23%31%25%7%
15540

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
221111336%9%64%
1432
16th to endDay
5%41431335%7%60%
1755
February1st to 15thDay
121331345%9%63%
1751
16th to endDay
231221445%8%62%
1579
March1st to 15thDay
1223236%5%9%62%
1800
16th to endDay
13112246%6%9%61%
2216
April1st to 15thDay
3312313336%65%
2149
16th to endDay
12112347%72%
2160
May1st to 15thDay
1212113346%71%
2295
16th to endDay
2313313347%65%
2429
June1st to 15thDay
12112346%74%
2516
16th to endDay
111223383%
2520
July1st to 15thDay
222213345%69%
2520
16th to endDay
2212324446%66%
2546
August1st to 15thDay
12112222380%
2160
16th to endDay
1211223479%
2292
September1st to 15thDay
11232223475%
2076
16th to endDay
1121113481%
1815
October1st to 15thDay
2112212235%73%
1779
16th to endDay
121121233473%
1708
November1st to 15thDay
1212112335%75%
1584
16th to endDay
121213447%71%
1620
December1st to 15thDay
121221335%9%66%
1620
16th to endDay
121331346%9%62%
1542
January1st to 15thNight
121321345%7%66%
2506
16th to endNight
35%13213346%64%
2463
February1st to 15thNight
21332236%7%65%
2101
16th to endNight
32222335%8%65%
1895
March1st to 15thNight
21232435%8%65%
2160
16th to endNight
2221346%9%63%
2005
April1st to 15thNight
121223448%69%
1799
16th to endNight
1111236%79%
1800
May1st to 15thNight
11112248%75%
1655
16th to endNight
11112226%78%
1684
June1st to 15thNight
1212236%78%
1441
16th to endNight
1211288%
1440
July1st to 15thNight
1111224477%
1440
16th to endNight
12121232476%
1616
August1st to 15thNight
111122384%
1800
16th to endNight
111112385%
1910
September1st to 15thNight
111222482%
1769
16th to endNight
11123385%
1815
October1st to 15thNight
221121233475%
1849
16th to endNight
112234478%
2162
November1st to 15thNight
111212336%74%
2275
16th to endNight
12212348%72%
2340
December1st to 15thNight
1212323348%66%
2340
16th to endNight
121222445%10%63%
2679

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
15%412%26%29%11%
1432
16th to endDay
23%311%23%22%15%
1755
February1st to 15thDay
17%411%27%25%13%
1751
16th to endDay
19%413%25%27%9%
1579
March1st to 15thDay
16%314%27%23%14%
1800
16th to endDay
16%5%14%27%24%11%
2216
April1st to 15thDay
20%39%26%27%13%
2149
16th to endDay
10%211%26%35%12%
2160
May1st to 15thDay
14%27%22%35%18%
2295
16th to endDay
18%25%20%39%13%
2432
June1st to 15thDay
10%16%12%30%37%
2516
16th to endDay
7%125%21%61%
2520
July1st to 15thDay
14%347%15%55%
2371
16th to endDay
16%35%10%18%44%
2387
August1st to 15thDay
10%126%20%57%
2146
16th to endDay
9%127%29%48%
2292
September1st to 15thDay
12%148%22%49%
2076
16th to endDay
8%113%35%39%
1815
October1st to 15thDay
14%25%16%36%24%
1779
16th to endDay
14%1416%38%24%
1708
November1st to 15thDay
13%29%25%32%17%
1584
16th to endDay
13%38%24%31%18%
1620
December1st to 15thDay
16%5%13%26%25%12%
1620
16th to endDay
19%6%15%24%20%13%
1542
January1st to 15thNight
16%413%23%29%12%
2506
16th to endNight
20%310%23%26%16%
2463
February1st to 15thNight
17%314%26%24%13%
2112
16th to endNight
17%314%25%29%8%
1895
March1st to 15thNight
17%313%25%23%15%
2160
16th to endNight
15%415%32%23%8%
2005
April1st to 15thNight
14%412%30%29%9%
1799
16th to endNight
8%28%32%36%11%
1800
May1st to 15thNight
9%28%27%38%12%
1656
16th to endNight
10%28%28%36%14%
1685
June1st to 15thNight
8%26%18%34%30%
1441
16th to endNight
5%27%27%56%
1440
July1st to 15thNight
10%139%18%56%
1360
16th to endNight
12%2410%23%46%
1512
August1st to 15thNight
7%129%25%52%
1790
16th to endNight
6%119%35%44%
1910
September1st to 15thNight
7%1310%27%48%
1769
16th to endNight
5%1215%36%39%
1815
October1st to 15thNight
13%2418%37%23%
1849
16th to endNight
10%2419%40%23%
2162
November1st to 15thNight
11%210%21%36%17%
2275
16th to endNight
11%310%26%29%18%
2340
December1st to 15thNight
17%413%26%28%9%
2340
16th to endNight
17%7%15%26%19%13%
2679

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%23%38%8%5%1
60
16th to endDay
13%26%32%19%6%
238
February1st to 15thDay
6%25%35%22%7%1
266
16th to endDay
12%32%34%16%4
238
March1st to 15thDay
11%25%38%14%7%1
270
16th to endDay
9%34%38%14%2
288
April1st to 15thDay
20%28%32%13%31
269
16th to endDay
11%37%37%11%2
270
May1st to 15thDay
7%27%39%20%32
288
16th to endDay
10%24%35%21%5%2
330
June1st to 15thDay
417%46%26%5%
315
16th to endDay
118%37%30%9%2
315
July1st to 15thDay
47%36%38%10%3
305
16th to endDay
4336%41%8%5%
327
August1st to 15thDay
5%10%41%29%8%4
315
16th to endDay
25%41%35%9%6%
332
September1st to 15thDay
29%42%37%8%1
294
16th to endDay
312%41%34%7%
255
October1st to 15thDay
7%21%40%24%5%
255
16th to endDay
8%18%45%22%4
220
November1st to 15thDay
10%10%16%31%25%6%
90
16th to endDay
6%21%35%30%6%
90
December1st to 15thDay
5%21%40%26%6%
90
16th to endDay
15%20%29%26%6%3
65
January1st to 15thNight
38%28%29%21%8%
720
16th to endNight
7%11%25%31%18%5%
768
February1st to 15thNight
29%31%28%20%7%
704
16th to endNight
6%10%31%28%17%5%
632
March1st to 15thNight
313%32%26%16%6%
720
16th to endNight
416%30%27%16%4
768
April1st to 15thNight
418%31%26%15%3
719
16th to endNight
313%33%25%19%4
720
May1st to 15thNight
211%34%31%15%3
576
16th to endNight
313%29%32%18%2
563
June1st to 15thNight
15%30%38%21%2
361
16th to endNight
1127%43%23%2
360
July1st to 15thNight
29%45%35%7%
340
16th to endNight
16%42%43%5%
480
August1st to 15thNight
111%39%38%8%
717
16th to endNight
19%30%44%13%
764
September1st to 15thNight
19%28%47%12%
700
16th to endNight
414%29%36%14%
656
October1st to 15thNight
25%23%33%25%10%
660
16th to endNight
27%18%26%30%13%
704
November1st to 15thNight
17%21%31%27%10%
700
16th to endNight
47%20%35%24%7%
720
December1st to 15thNight
49%27%31%20%6%
720
16th to endNight
414%29%29%16%4
768
Page generated at 2017-09-11 16:35:25. Version ac04

Copyright 2017 A. Danko


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