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Waynesville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Waynesville clear sky chart from 2005-11-06 to 2024-01-16.

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
43%
23988
18%
74477
12%
23929
51%
23929
21%
49001

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 10thNight
25%
760
21%
2459
10%
757
40%
757
19%
1571
January11th to 20thNight
23%
741
20%
2406
9%
741
36%
741
15%
1637
January21st to endNight
21%
792
23%
2574
9%
792
39%
792
19%
1630
February1st to 10thNight
29%
720
21%
2228
11%
720
40%
720
21%
1443
February11th to 20thNight
19%
703
18%
2098
7%
699
31%
699
17%
1426
February21st to endNight
21%
592
19%
1776
8%
592
31%
592
15%
1259
March1st to 10thNight
27%
720
22%
2048
11%
720
37%
720
21%
1352
March11th to 20thNight
27%
720
15%
1980
7%
720
34%
720
18%
1402
March21st to endNight
27%
792
14%
2178
6%
792
33%
792
19%
1530
April1st to 10thNight
30%
720
19%
1980
8%
720
39%
720
24%
1272
April11th to 20thNight
36%
584
22%
1761
11%
584
48%
584
26%
1095
April21st to endNight
44%
540
23%
1620
13%
540
52%
540
26%
1021
May1st to 10thNight
41%
540
15%
1620
7%
540
46%
540
22%
1086
May11th to 20thNight
48%
531
11%
1593
7%
531
52%
531
20%
1116
May21st to endNight
61%
582
14%
1744
10%
582
62%
582
25%
1171
June1st to 10thNight
62%
540
12%
1620
9%
540
63%
540
23%
1114
June11th to 20thNight
67%
540
11%
1620
8%
540
69%
540
29%
1039
June21st to endNight
68%
540
15%
1620
12%
540
69%
540
27%
1049
July1st to 10thNight
66%
525
10%
1575
8%
525
67%
525
21%
1139
July11th to 20thNight
69%
522
9%
1566
9%
522
69%
522
22%
1130
July21st to endNight
68%
591
11%
1672
10%
558
68%
558
23%
1181
August1st to 10thNight
68%
537
10%
1600
9%
534
69%
534
21%
1141
August11th to 20thNight
67%
534
15%
1598
15%
534
67%
534
20%
1151
August21st to endNight
66%
619
13%
1964
14%
619
67%
619
20%
1366
September1st to 10thNight
60%
720
15%
1980
13%
720
60%
720
22%
1409
September11th to 20thNight
55%
720
18%
1980
16%
720
56%
720
21%
1404
September21st to endNight
55%
720
22%
1980
18%
720
58%
720
28%
1300
October1st to 10thNight
51%
720
23%
1986
19%
720
55%
720
29%
1258
October11th to 20thNight
45%
720
24%
2160
19%
720
53%
720
26%
1352
October21st to endNight
50%
792
30%
2376
24%
792
59%
792
31%
1403
November1st to 10thNight
50%
740
24%
2334
20%
740
58%
740
29%
1385
November11th to 20thNight
42%
760
26%
2470
20%
760
53%
760
26%
1452
November21st to endNight
41%
760
25%
2470
16%
760
53%
760
25%
1492
December1st to 10thNight
31%
760
19%
2470
11%
760
41%
760
17%
1678
December11th to 20thNight
33%
759
24%
2947
14%
758
45%
758
18%
1816
December21st to endNight
28%
832
13%
4424
10%
817
39%
817
10%
2731

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%7%37%7%46%6%6%8%36%
74918
Night
8%7%37%6%45%5%6%8%40%
74888
TransparencyDay
44%9%11%17%15%4
74641
Night
40%9%13%18%15%4
74684
SeeingDay
17%15%25%21%14%7%
13873
Night
14%12%23%28%19%4
23995

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 10thDay
6%7%39%6%35%5%7%8%40%
1706
11th to 20thDay
9%7%5%8%7%36%6%5%6%39%
1665
21st to endDay
8%7%36%6%35%5%5%6%46%
1782
February1st to 10thDay
9%8%48%6%46%5%5%7%39%
1731
11th to 20thDay
8%8%47%8%45%5%5%7%39%
1748
21st to endDay
9%8%47%7%45%6%5%6%38%
1480
March1st to 10thDay
9%6%36%5%35%5%6%7%43%
1910
11th to 20thDay
13%8%37%7%445%6%7%35%
1980
21st to endDay
10%9%48%6%36%5%5%8%35%
2178
April1st to 10thDay
8%7%35%6%45%6%6%8%41%
1980
11th to 20thDay
12%7%37%6%36%5%6%6%40%
2162
21st to endDay
11%7%37%5%45%5%5%6%42%
2340
May1st to 10thDay
10%8%38%6%46%5%5%8%37%
2340
11th to 20thDay
13%7%48%8%5%6%6%6%7%30%
2301
21st to endDay
11%6%47%8%47%6%7%10%31%
2531
June1st to 10thDay
10%8%47%9%6%8%7%7%10%26%
2340
11th to 20thDay
8%7%48%8%5%8%8%7%9%28%
2340
21st to endDay
9%6%37%9%5%8%7%7%10%30%
2340
July1st to 10thDay
10%8%49%10%5%7%9%8%9%21%
2340
11th to 20thDay
12%8%48%8%5%9%8%8%9%21%
2340
21st to endDay
10%8%48%9%7%8%8%8%9%23%
2547
August1st to 10thDay
11%9%49%8%6%8%7%8%8%22%
2327
11th to 20thDay
11%9%38%10%6%8%6%7%9%22%
2303
21st to endDay
11%8%48%8%5%7%7%7%8%26%
2368
September1st to 10thDay
12%7%48%8%5%6%7%6%7%31%
1980
11th to 20thDay
16%9%37%7%46%5%6%8%30%
1980
21st to endDay
14%7%36%6%35%5%5%7%38%
1980
October1st to 10thDay
11%6%25%6%35%45%7%45%
1972
11th to 20thDay
7%6%35%5%4445%6%51%
1800
21st to endDay
9%6%25%42435%7%53%
1980
November1st to 10thDay
7%5%25%435%45%6%55%
1740
11th to 20thDay
7%6%36%5%235%5%8%50%
1710
21st to endDay
9%7%36%5%35%5%5%7%46%
1710
December1st to 10thDay
10%9%47%8%35%5%7%6%36%
1710
11th to 20thDay
8%7%27%5%35%5%7%7%45%
2153
21st to endDay
11%7%38%6%46%5%46%40%
3124
January1st to 10thNight
8%7%38%8%36%6%5%7%40%
2459
11th to 20thNight
7%8%48%8%46%5%7%6%36%
2406
21st to endNight
8%8%48%7%35%45%6%43%
2574
February1st to 10thNight
7%7%46%5%46%6%6%8%41%
2228
11th to 20thNight
9%9%48%7%35%5%5%7%38%
2098
21st to endNight
10%8%48%6%46%6%6%7%35%
1776
March1st to 10thNight
8%7%47%5%36%5%7%7%41%
2048
11th to 20thNight
9%10%48%7%45%5%7%8%34%
1980
21st to endNight
9%8%47%7%5%6%6%6%9%35%
2178
April1st to 10thNight
8%7%46%6%445%6%8%44%
1980
11th to 20thNight
7%7%36%6%345%5%7%46%
1761
21st to endNight
9%8%35%435%5%5%7%47%
1620
May1st to 10thNight
9%8%36%5%46%5%6%7%39%
1620
11th to 20thNight
10%6%38%7%46%5%6%9%36%
1592
21st to endNight
7%6%36%6%5%6%6%6%9%40%
1744
June1st to 10thNight
6%6%37%6%5%5%7%9%12%34%
1620
11th to 20thNight
4436%5%35%8%8%14%41%
1620
21st to endNight
6%425%6%45%8%9%11%40%
1620
July1st to 10thNight
8%6%35%7%48%7%9%12%31%
1620
11th to 20thNight
7%436%8%5%7%7%10%12%31%
1620
21st to endNight
6%5%37%8%46%7%9%11%33%
1771
August1st to 10thNight
7%5%37%7%48%7%8%11%33%
1611
11th to 20thNight
8%7%37%6%46%6%7%10%35%
1598
21st to endNight
9%7%37%6%47%7%7%10%34%
1964
September1st to 10thNight
8%8%37%7%46%6%7%8%36%
1980
11th to 20thNight
11%9%37%7%446%5%8%36%
1980
21st to endNight
11%7%36%5%3435%8%44%
1980
October1st to 10thNight
11%8%25%44435%6%48%
1986
11th to 20thNight
9%7%36%6%35%45%5%47%
2160
21st to endNight
8%8%35%434446%52%
2376
November1st to 10thNight
8%6%35%5%3445%6%49%
2334
11th to 20thNight
8%7%36%5%35%45%7%48%
2470
21st to endNight
9%7%35%5%36%6%6%6%46%
2470
December1st to 10thNight
9%10%5%8%6%45%5%7%7%35%
2470
11th to 20thNight
9%9%47%5%34446%44%
3042
21st to endNight
11%8%49%8%45%7%7%8%30%
4532

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 10thDay
40%7%9%18%21%6%
1707
11th to 20thDay
44%8%8%17%18%6%
1665
21st to endDay
38%5%9%19%21%8%
1782
February1st to 10thDay
44%6%10%19%16%5%
1731
11th to 20thDay
45%7%9%16%18%6%
1758
21st to endDay
45%7%9%13%18%8%
1480
March1st to 10thDay
38%6%9%19%19%8%
1910
11th to 20thDay
47%8%10%13%16%6%
1980
21st to endDay
48%7%12%16%14%3
2178
April1st to 10thDay
38%7%13%20%18%4
1980
11th to 20thDay
42%7%9%16%20%5%
2162
21st to endDay
41%7%11%24%15%2
2340
May1st to 10thDay
44%8%13%19%13%2
2340
11th to 20thDay
51%12%11%15%10%1
2305
21st to endDay
45%13%13%19%10%1
2531
June1st to 10thDay
50%13%16%15%6%
2340
11th to 20thDay
45%15%16%13%10%1
2340
21st to endDay
46%11%15%17%9%2
2340
July1st to 10thDay
54%14%14%12%6%
2275
11th to 20thDay
53%14%16%9%7%1
2271
21st to endDay
51%15%15%13%6%1
2405
August1st to 10thDay
55%13%13%15%3
2314
11th to 20thDay
54%13%13%13%6%1
2303
21st to endDay
52%13%13%14%7%2
2368
September1st to 10thDay
48%10%11%16%12%3
1980
11th to 20thDay
51%8%8%17%13%2
1980
21st to endDay
44%8%11%17%14%5%
1980
October1st to 10thDay
37%9%9%18%22%6%
1972
11th to 20thDay
33%6%8%22%21%9%
1800
21st to endDay
32%5%9%21%23%10%
1980
November1st to 10thDay
30%5%9%18%27%11%
1740
11th to 20thDay
32%6%7%19%26%10%
1710
21st to endDay
36%6%7%20%23%8%
1710
December1st to 10thDay
46%7%9%17%15%6%
1710
11th to 20thDay
36%5%11%14%22%11%
2150
21st to endDay
40%7%10%21%18%4
3124
January1st to 10thNight
41%7%10%17%18%7%
2459
11th to 20thNight
46%8%9%13%19%5%
2406
21st to endNight
42%5%8%18%22%5%
2574
February1st to 10thNight
40%7%13%18%18%5%
2228
11th to 20thNight
45%6%9%19%16%5%
2099
21st to endNight
48%8%10%15%14%6%
1776
March1st to 10thNight
40%7%10%15%20%8%
2048
11th to 20thNight
46%8%12%18%13%3
1980
21st to endNight
45%9%13%19%12%2
2178
April1st to 10thNight
36%8%14%22%18%3
1980
11th to 20thNight
35%8%11%21%19%5%
1761
21st to endNight
36%9%13%27%15%1
1620
May1st to 10thNight
39%11%15%24%9%2
1620
11th to 20thNight
42%12%17%19%9%
1593
21st to endNight
38%12%18%24%8%
1745
June1st to 10thNight
38%14%21%20%6%1
1620
11th to 20thNight
30%15%26%22%6%1
1620
21st to endNight
33%14%20%21%10%2
1620
July1st to 10thNight
40%17%19%17%7%
1575
11th to 20thNight
38%18%23%13%5%2
1566
21st to endNight
39%15%23%16%6%1
1672
August1st to 10thNight
41%15%22%17%6%
1600
11th to 20thNight
41%16%18%15%9%
1598
21st to endNight
41%14%19%17%7%1
1964
September1st to 10thNight
41%14%14%19%11%2
1980
11th to 20thNight
45%10%12%18%14%1
1980
21st to endNight
38%8%12%22%16%4
1980
October1st to 10thNight
36%8%12%19%22%4
1986
11th to 20thNight
36%8%10%21%19%6%
2160
21st to endNight
33%5%7%22%24%9%
2376
November1st to 10thNight
33%7%10%19%21%9%
2334
11th to 20thNight
36%5%8%18%23%11%
2470
21st to endNight
36%7%8%21%21%7%
2470
December1st to 10thNight
46%8%11%15%14%6%
2470
11th to 20thNight
39%8%7%14%24%9%
3044
21st to endNight
45%8%11%17%15%4
4532

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 10thDay
24%30%34%10%1
270
11th to 20thDay
29%29%27%13%2
255
21st to endDay
25%39%27%7%3
264
February1st to 10thDay
28%34%29%8%2
240
11th to 20thDay
39%31%25%5%
240
21st to endDay
35%38%20%5%2
198
March1st to 10thDay
22%25%33%13%7%
350
11th to 20thDay
24%29%30%13%41
420
21st to endDay
21%25%32%14%6%
462
April1st to 10thDay
21%21%29%21%7%1
420
11th to 20thDay
19%26%24%17%11%3
412
21st to endDay
19%17%30%20%11%4
420
May1st to 10thDay
17%23%29%18%9%5%
423
11th to 20thDay
16%11%29%25%12%8%
447
21st to endDay
12%11%20%30%15%11%
485
June1st to 10thDay
12%7%26%26%18%11%
450
11th to 20thDay
8%8%25%22%25%12%
450
21st to endDay
9%8%29%23%17%13%
450
July1st to 10thDay
8%320%25%27%16%
445
11th to 20thDay
8%416%28%25%19%
444
21st to endDay
10%313%29%27%18%
488
August1st to 10thDay
15%5%19%23%20%18%
446
11th to 20thDay
11%318%28%25%16%
439
21st to endDay
11%416%25%26%18%
495
September1st to 10thDay
9%319%27%28%13%
450
11th to 20thDay
16%5%18%26%25%11%
450
21st to endDay
16%8%19%29%22%6%
450
October1st to 10thDay
18%10%20%25%19%8%
450
11th to 20thDay
11%17%26%26%16%3
450
21st to endDay
17%15%23%29%12%3
495
November1st to 10thDay
15%15%30%25%11%3
338
11th to 20thDay
21%21%34%18%5%
270
21st to endDay
16%25%33%20%6%1
270
December1st to 10thDay
27%27%29%13%4
270
11th to 20thDay
18%24%35%18%4
270
21st to endDay
23%22%41%10%41
297
January1st to 10thNight
19%19%33%22%5%1
760
11th to 20thNight
18%23%32%21%6%
741
21st to endNight
16%20%37%23%3
792
February1st to 10thNight
16%21%32%27%5%
720
11th to 20thNight
23%21%35%19%2
703
21st to endNight
24%23%29%20%3
592
March1st to 10thNight
18%20%31%27%4
720
11th to 20thNight
18%21%29%23%8%1
720
21st to endNight
18%18%32%23%8%
792
April1st to 10thNight
17%22%27%25%9%1
720
11th to 20thNight
15%16%29%25%13%3
584
21st to endNight
13%15%23%35%14%1
540
May1st to 10thNight
14%12%27%29%16%2
540
11th to 20thNight
12%7%22%33%23%3
531
21st to endNight
10%415%29%34%8%
584
June1st to 10thNight
6%417%36%31%6%
540
11th to 20thNight
4316%28%36%12%
540
21st to endNight
6%313%32%39%7%
540
July1st to 10thNight
9%29%27%44%9%
525
11th to 20thNight
9%18%27%41%14%
522
21st to endNight
7%17%26%46%13%
591
August1st to 10thNight
7%27%30%42%11%
537
11th to 20thNight
9%29%31%41%10%
534
21st to endNight
11%28%26%40%13%
619
September1st to 10thNight
10%411%27%40%8%
720
11th to 20thNight
15%413%28%33%7%
720
21st to endNight
14%6%15%33%28%4
720
October1st to 10thNight
15%9%18%23%26%9%
720
11th to 20thNight
14%10%25%30%18%3
720
21st to endNight
14%13%18%37%14%4
792
November1st to 10thNight
13%10%21%34%19%4
740
11th to 20thNight
16%14%23%32%12%3
760
21st to endNight
16%14%24%30%14%1
760
December1st to 10thNight
18%16%29%29%8%
760
11th to 20thNight
14%18%29%30%8%1
760
21st to endNight
20%16%30%29%5%
836
Page generated at 2024-01-13 01:38:14. Version ac07

Copyright 2024 Attilla Danko


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