Smoky Mountain Stargaze
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Smoky Mountain Stargaze clear sky chart from 2005-11-05 to 2018-10-08.

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
50%
16940
19%
51093
15%
16898
55%
16898
24%
33379

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
32%
779
20%
2522
12%
776
44%
776
20%
1653
January16th to endNight
29%
832
21%
2704
12%
832
41%
832
20%
1765
February1st to 15thNight
33%
763
21%
2321
12%
760
44%
760
22%
1538
February16th to endNight
25%
683
19%
2049
10%
683
34%
683
18%
1438
March1st to 15thNight
34%
780
20%
2207
12%
780
41%
780
21%
1508
March16th to endNight
36%
832
15%
2288
10%
832
41%
832
22%
1579
April1st to 15thNight
41%
730
21%
2093
13%
730
48%
730
28%
1315
April16th to endNight
50%
579
21%
1764
13%
579
57%
579
27%
1118
May1st to 15thNight
53%
585
15%
1755
10%
585
57%
585
25%
1154
May16th to endNight
62%
609
14%
1827
12%
609
63%
609
24%
1230
June1st to 15thNight
70%
585
12%
1755
11%
585
71%
585
27%
1131
June16th to endNight
76%
585
14%
1755
12%
585
77%
585
31%
1102
July1st to 15thNight
69%
555
10%
1665
8%
555
69%
555
24%
1155
July16th to endNight
73%
612
11%
1739
10%
579
74%
579
26%
1167
August1st to 15thNight
67%
575
14%
1715
13%
572
67%
572
23%
1179
August16th to endNight
69%
627
16%
2009
16%
627
69%
627
24%
1308
September1st to 15thNight
63%
780
14%
2145
13%
780
63%
780
22%
1516
September16th to endNight
61%
777
22%
2145
19%
777
63%
777
29%
1391
October1st to 15thNight
57%
752
29%
2119
25%
752
61%
752
33%
1284
October16th to endNight
54%
768
32%
2304
26%
768
63%
768
34%
1327
November1st to 15thNight
55%
760
26%
2438
25%
760
61%
760
31%
1417
November16th to endNight
48%
780
27%
2535
22%
780
57%
780
27%
1521
December1st to 15thNight
40%
780
20%
2535
15%
780
48%
780
19%
1677
December16th to endNight
34%
832
18%
2704
13%
832
42%
832
16%
1906

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
14%7%36%6%35%5%5%7%36%
52034
Night
12%6%25%5%35%45%7%40%
51291
TransparencyDay
47%5%11%18%14%3
51735
Night
41%6%12%20%15%3
51094
SeeingDay
18%7%17%22%19%13%
6812
Night
17%6%16%30%23%5%
16944

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
17%7%36%434336%38%
1746
16th to endDay
14%7%25%32445%6%44%
1872
February1st to 15thDay
16%9%25%5%24446%38%
1868
16th to endDay
18%6%36%424247%38%
1710
March1st to 15thDay
18%7%34424346%39%
2081
16th to endDay
16%9%45%425%45%6%36%
2287
April1st to 15thDay
13%6%15%5%25%46%8%40%
2194
16th to endDay
16%7%35%42445%6%39%
2469
May1st to 15thDay
14%7%35%6%445%5%6%36%
2526
16th to endDay
14%6%38%7%36%6%5%7%30%
2639
June1st to 15thDay
10%6%36%7%5%7%7%6%7%29%
2535
16th to endDay
7%5%36%7%5%7%6%7%9%31%
2535
July1st to 15thDay
11%7%38%9%5%8%8%7%8%22%
2535
16th to endDay
10%6%36%7%5%7%8%7%10%24%
2673
August1st to 15thDay
10%7%37%9%47%7%6%9%25%
2487
16th to endDay
14%7%37%9%47%5%6%8%25%
2529
September1st to 15thDay
13%9%46%7%46%6%5%7%28%
2145
16th to endDay
16%6%36%5%345%5%8%34%
2145
October1st to 15thDay
12%5%14424346%50%
2009
16th to endDay
12%6%13313325%56%
1920
November1st to 15thDay
11%6%2341335%6%51%
1747
16th to endDay
14%5%25%423346%47%
1755
December1st to 15thDay
17%9%344245%45%37%
1755
16th to endDay
20%9%35%423245%37%
1872
January1st to 15thNight
16%8%346%34445%38%
2522
16th to endNight
14%8%46%5%24445%39%
2704
February1st to 15thNight
14%7%35%5%24446%41%
2312
16th to endNight
15%8%36%5%345%46%35%
2049
March1st to 15thNight
14%7%35%5%35%45%6%38%
2207
16th to endNight
14%7%36%5%35%447%38%
2288
April1st to 15thNight
11%6%145%33347%46%
2093
16th to endNight
11%6%24424447%46%
1764
May1st to 15thNight
10%5%36%6%345%6%8%39%
1754
16th to endNight
8%425%7%37%7%7%9%35%
1826
June1st to 15thNight
6%5%25%5%46%6%7%12%37%
1755
16th to endNight
5%424436%6%7%11%43%
1755
July1st to 15thNight
7%6%25%6%46%6%9%11%33%
1755
16th to endNight
7%5%25%6%37%7%9%11%34%
1847
August1st to 15thNight
9%7%25%6%35%5%7%9%37%
1726
16th to endNight
8%5%26%6%5%45%8%10%36%
2009
September1st to 15thNight
10%5%26%6%5%6%6%7%8%33%
2145
16th to endNight
12%6%2442445%8%42%
2145
October1st to 15thNight
11%5%1432335%7%50%
2119
16th to endNight
8%6%2442343455%
2304
November1st to 15thNight
12%6%24314236%50%
2438
16th to endNight
14%6%24324345%48%
2535
December1st to 15thNight
14%8%36%43445%6%37%
2535
16th to endNight
18%9%46%5%24446%33%
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
48%36%17%17%5%
1747
16th to endDay
40%28%22%19%5%
1872
February1st to 15thDay
48%36%20%18%2
1870
16th to endDay
47%210%16%18%3
1710
March1st to 15thDay
46%27%20%16%6%
2081
16th to endDay
49%5%12%17%12%2
2288
April1st to 15thDay
41%411%23%16%2
2194
16th to endDay
45%38%20%16%4
2469
May1st to 15thDay
48%5%11%20%11%2
2526
16th to endDay
51%8%11%18%8%1
2643
June1st to 15thDay
51%7%16%17%5%
2535
16th to endDay
45%8%15%17%10%1
2535
July1st to 15thDay
55%9%14%13%5%
2396
16th to endDay
49%10%17%15%6%
2518
August1st to 15thDay
53%9%13%15%7%1
2474
16th to endDay
56%6%14%14%7%1
2529
September1st to 15thDay
56%6%9%13%11%2
2145
16th to endDay
47%6%10%17%16%2
2145
October1st to 15thDay
36%49%20%23%5%
2009
16th to endDay
33%25%22%24%10%
1920
November1st to 15thDay
35%35%19%26%9%
1747
16th to endDay
39%26%18%25%7%
1755
December1st to 15thDay
48%37%17%17%5%
1755
16th to endDay
50%29%16%15%4
1872
January1st to 15thNight
47%27%17%19%5%
2522
16th to endNight
47%26%18%20%4
2704
February1st to 15thNight
45%38%21%18%3
2321
16th to endNight
51%38%19%14%2
2049
March1st to 15thNight
46%410%16%17%5%
2207
16th to endNight
46%5%12%21%12%1
2288
April1st to 15thNight
38%312%25%16%2
2093
16th to endNight
39%5%11%22%17%3
1764
May1st to 15thNight
42%5%16%23%10%1
1755
16th to endNight
40%9%17%21%8%
1828
June1st to 15thNight
36%10%25%20%6%
1755
16th to endNight
30%12%22%22%10%1
1755
July1st to 15thNight
39%12%21%18%6%
1665
16th to endNight
36%12%24%17%6%1
1739
August1st to 15thNight
41%10%18%17%10%
1715
16th to endNight
40%8%21%21%6%1
2009
September1st to 15thNight
43%11%16%17%9%2
2145
16th to endNight
38%6%13%20%18%1
2145
October1st to 15thNight
33%5%10%23%23%3
2119
16th to endNight
32%35%23%25%8%
2304
November1st to 15thNight
36%27%20%24%9%
2438
16th to endNight
39%25%21%22%7%
2535
December1st to 15thNight
47%38%17%16%6%
2535
16th to endNight
53%38%15%14%3
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
29%15%30%20%3
135
16th to endDay
25%25%31%11%6%
144
February1st to 15thDay
33%20%34%9%2
135
16th to endDay
40%15%30%10%2
120
March1st to 15thDay
30%16%23%21%8%1
266
16th to endDay
22%15%25%23%10%2
352
April1st to 15thDay
20%11%20%30%12%3
330
16th to endDay
18%8%21%24%20%6%
319
May1st to 15thDay
16%12%22%19%17%12%
348
16th to endDay
21%6%14%22%16%18%
395
June1st to 15thDay
13%312%25%26%19%
375
16th to endDay
10%418%20%20%25%
375
July1st to 15thDay
12%114%21%24%24%
365
16th to endDay
10%18%23%27%28%
390
August1st to 15thDay
16%210%22%22%25%
358
16th to endDay
14%19%19%27%27%
396
September1st to 15thDay
14%5%9%18%31%20%
375
16th to endDay
17%211%26%29%12%
374
October1st to 15thDay
16%5%12%25%26%13%
345
16th to endDay
16%8%16%30%20%6%
336
November1st to 15thDay
19%422%33%16%3
165
16th to endDay
17%8%27%27%16%2
135
December1st to 15thDay
25%14%31%20%5%1
135
16th to endDay
35%7%39%13%3
144
January1st to 15thNight
27%10%25%29%7%
780
16th to endNight
23%11%29%30%5%
832
February1st to 15thNight
24%9%27%34%3
764
16th to endNight
27%15%28%25%3
683
March1st to 15thNight
23%12%25%31%6%
780
16th to endNight
20%10%25%30%11%1
832
April1st to 15thNight
19%11%22%31%13%1
730
16th to endNight
16%7%16%37%19%2
579
May1st to 15thNight
14%5%16%35%24%3
585
16th to endNight
13%27%32%34%9%
611
June1st to 15thNight
9%7%32%39%10%
585
16th to endNight
7%15%27%45%12%
585
July1st to 15thNight
10%15%21%49%11%
555
16th to endNight
8%221%50%16%
612
August1st to 15thNight
11%1225%46%12%
575
16th to endNight
11%320%49%14%
627
September1st to 15thNight
13%25%25%42%10%
780
16th to endNight
16%27%30%37%5%
777
October1st to 15thNight
15%6%13%26%29%9%
752
16th to endNight
14%8%17%35%20%4
768
November1st to 15thNight
15%5%16%34%21%5%
760
16th to endNight
20%7%18%34%17%1
780
December1st to 15thNight
23%9%19%36%10%1
780
16th to endNight
26%8%26%31%7%
832
Page generated at 2018-10-09 10:39:09. Version ac04

Copyright 2018 A. Danko


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