Gaston County
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Gaston County clear sky chart from 2005-11-06 to 2024-01-13.

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
47%
24232
14%
74352
9%
24181
52%
24181
14%
55871

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
30%
759
15%
2459
7%
757
41%
757
12%
1829
January11th to 20thNight
30%
729
15%
2367
7%
729
40%
729
11%
1798
January21st to endNight
30%
792
17%
2574
8%
792
41%
792
13%
1936
February1st to 10thNight
35%
720
14%
2340
6%
720
44%
720
13%
1737
February11th to 20thNight
21%
701
15%
2102
4%
699
33%
699
14%
1604
February21st to endNight
25%
592
17%
1744
6%
592
36%
592
13%
1340
March1st to 10thNight
37%
720
19%
1980
10%
720
45%
720
18%
1450
March11th to 20thNight
32%
720
15%
1980
7%
720
38%
720
15%
1522
March21st to endNight
32%
792
12%
2178
4%
792
39%
792
13%
1709
April1st to 10thNight
37%
720
16%
1980
7%
720
43%
720
17%
1457
April11th to 20thNight
41%
711
21%
1793
10%
711
48%
711
22%
1291
April21st to endNight
47%
576
17%
1656
10%
576
52%
576
17%
1227
May1st to 10thNight
47%
540
12%
1620
5%
540
52%
540
14%
1219
May11th to 20thNight
49%
531
10%
1593
4%
531
52%
531
10%
1298
May21st to endNight
62%
582
12%
1745
10%
582
63%
582
15%
1334
June1st to 10thNight
63%
540
10%
1620
8%
540
64%
540
13%
1263
June11th to 20thNight
58%
540
10%
1620
8%
540
59%
540
14%
1282
June21st to endNight
66%
540
11%
1620
10%
540
66%
540
14%
1259
July1st to 10thNight
65%
525
7%
1575
6%
525
65%
525
11%
1292
July11th to 20thNight
71%
522
7%
1566
5%
522
72%
522
14%
1223
July21st to endNight
69%
591
7%
1672
6%
558
70%
558
11%
1373
August1st to 10thNight
63%
537
9%
1600
9%
534
63%
534
15%
1253
August11th to 20thNight
63%
534
12%
1598
10%
534
63%
534
13%
1274
August21st to endNight
65%
720
9%
1908
6%
720
66%
720
12%
1576
September1st to 10thNight
69%
720
14%
1974
11%
720
69%
720
16%
1533
September11th to 20thNight
57%
720
13%
1980
11%
720
59%
720
15%
1564
September21st to endNight
53%
720
13%
1980
10%
720
56%
720
16%
1521
October1st to 10thNight
57%
720
18%
2077
16%
720
61%
720
19%
1512
October11th to 20thNight
50%
720
19%
2160
15%
720
56%
720
16%
1593
October21st to endNight
52%
792
19%
2376
14%
792
60%
792
18%
1707
November1st to 10thNight
50%
740
19%
2221
15%
740
56%
740
20%
1574
November11th to 20thNight
44%
760
18%
2436
13%
760
51%
760
15%
1790
November21st to endNight
47%
760
17%
2470
12%
760
55%
760
14%
1827
December1st to 10thNight
36%
760
16%
2470
9%
760
44%
760
12%
1865
December11th to 20thNight
40%
759
19%
2925
12%
758
47%
758
11%
2064
December21st to endNight
33%
827
12%
4393
9%
817
41%
817
8%
2775

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%5%25%5%35%5%6%8%44%
74925
Night
14%5%25%5%345%5%7%44%
74815
TransparencyDay
25%38%7%14%13%3
74648
Night
26%37%7%13%14%4
74611
SeeingDay
16%7%22%24%20%10%
14111
Night
16%6%23%31%20%3
24247

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
18%6%25%5%235%45%46%
1706
11th to 20thDay
17%8%34434345%44%
1638
21st to endDay
17%5%25%324446%48%
1782
February1st to 10thDay
16%7%244335%6%7%42%
1620
11th to 20thDay
21%5%24323445%46%
1741
21st to endDay
20%7%35%424436%41%
1511
March1st to 10thDay
16%424324446%51%
1980
11th to 20thDay
17%6%36%5%345%5%8%40%
1980
21st to endDay
16%6%35%5%335%5%7%42%
2178
April1st to 10thDay
10%42433446%8%51%
1980
11th to 20thDay
14%5%2442445%7%48%
2116
21st to endDay
13%5%25%4245%5%7%48%
2318
May1st to 10thDay
9%5%25%5%35%5%6%9%45%
2340
11th to 20thDay
13%5%35%6%35%5%6%8%40%
2301
21st to endDay
11%6%25%6%35%6%6%10%41%
2531
June1st to 10thDay
9%6%35%5%35%6%8%11%39%
2340
11th to 20thDay
8%435%6%36%6%8%9%42%
2340
21st to endDay
6%426%5%46%6%9%12%39%
2340
July1st to 10thDay
8%5%36%7%5%7%6%9%11%33%
2340
11th to 20thDay
8%5%35%5%48%8%8%13%33%
2340
21st to endDay
6%5%35%6%47%7%8%12%37%
2547
August1st to 10thDay
11%5%26%6%5%7%7%8%10%33%
2327
11th to 20thDay
12%5%36%6%5%7%7%8%11%30%
2303
21st to endDay
10%6%26%6%47%6%7%10%37%
2430
September1st to 10thDay
9%5%245%46%6%7%10%43%
1981
11th to 20thDay
12%6%25%5%345%6%9%43%
1980
21st to endDay
18%6%25%5%35%445%42%
1980
October1st to 10thDay
15%5%23423345%56%
1882
11th to 20thDay
14%5%23323236%57%
1800
21st to endDay
14%5%2332233457%
1980
November1st to 10thDay
13%5%24423345%56%
1857
11th to 20thDay
13%433323447%53%
1739
21st to endDay
15%5%2442435%5%50%
1710
December1st to 10thDay
18%7%35%5%34446%41%
1710
11th to 20thDay
16%5%2432335%6%52%
2153
21st to endDay
18%7%244245%5%7%42%
3124
January1st to 10thNight
17%6%25%433445%48%
2459
11th to 20thNight
17%6%345%345%45%45%
2367
21st to endNight
16%6%24423445%50%
2574
February1st to 10thNight
16%6%2443435%7%46%
2340
11th to 20thNight
20%7%345%23445%44%
2102
21st to endNight
17%6%25%5%245%5%7%43%
1744
March1st to 10thNight
14%5%25%5%24446%50%
1980
11th to 20thNight
16%6%35%4345%5%7%42%
1980
21st to endNight
16%5%25%6%35%45%6%43%
2178
April1st to 10thNight
12%5%245%3445%7%49%
1980
11th to 20thNight
13%435%32445%6%52%
1793
21st to endNight
13%5%246%35%45%8%48%
1656
May1st to 10thNight
10%5%35%6%345%5%7%46%
1620
11th to 20thNight
12%5%26%8%5%6%5%6%10%35%
1592
21st to endNight
12%6%25%6%35%6%6%9%40%
1744
June1st to 10thNight
11%5%26%6%46%7%8%11%35%
1620
11th to 20thNight
10%5%26%6%46%6%7%10%37%
1620
21st to endNight
7%5%35%7%47%5%9%12%36%
1620
July1st to 10thNight
7%5%38%8%5%7%7%8%12%31%
1620
11th to 20thNight
7%5%35%6%36%6%10%13%35%
1620
21st to endNight
6%5%46%8%49%8%8%11%33%
1771
August1st to 10thNight
12%6%47%7%36%7%7%11%31%
1611
11th to 20thNight
11%9%36%7%47%6%7%9%33%
1598
21st to endNight
8%6%37%7%45%7%9%12%32%
1908
September1st to 10thNight
9%5%35%5%35%5%7%9%43%
1974
11th to 20thNight
14%7%36%6%35%6%5%7%39%
1980
21st to endNight
17%7%26%6%35%5%5%6%41%
1980
October1st to 10thNight
16%5%24334345%51%
2077
11th to 20thNight
14%42442335%6%53%
2160
21st to endNight
13%424323335%58%
2376
November1st to 10thNight
14%5%24423336%55%
2221
11th to 20thNight
13%4245%33446%52%
2436
21st to endNight
14%424425%45%7%49%
2470
December1st to 10thNight
19%7%25%5%34345%42%
2470
11th to 20thNight
17%6%2432334452%
3042
21st to endNight
20%5%244345%5%7%42%
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
25%40%5%14%13%2
1707
11th to 20thDay
27%40%5%11%14%3
1638
21st to endDay
28%36%314%14%4
1782
February1st to 10thDay
27%37%7%13%13%3
1620
11th to 20thDay
27%36%414%15%4
1751
21st to endDay
30%36%5%13%12%5%
1511
March1st to 10thDay
21%36%316%19%5%
1980
11th to 20thDay
30%37%8%11%10%4
1980
21st to endDay
30%38%7%14%10%1
2178
April1st to 10thDay
19%37%7%15%17%4
1980
11th to 20thDay
21%36%7%13%17%7%
2116
21st to endDay
24%37%7%15%14%3
2318
May1st to 10thDay
25%38%10%14%12%2
2340
11th to 20thDay
27%40%10%11%10%1
2305
21st to endDay
25%39%9%17%10%1
2531
June1st to 10thDay
25%40%9%18%8%1
2340
11th to 20thDay
25%40%11%14%9%1
2340
21st to endDay
22%41%10%16%10%2
2340
July1st to 10thDay
27%41%11%11%9%2
2275
11th to 20thDay
25%43%13%9%8%1
2271
21st to endDay
25%42%14%12%6%
2405
August1st to 10thDay
25%41%11%16%7%
2314
11th to 20thDay
31%40%10%12%7%
2303
21st to endDay
29%39%11%13%6%2
2430
September1st to 10thDay
23%39%10%13%12%4
1981
11th to 20thDay
26%38%7%11%15%2
1980
21st to endDay
27%37%413%15%4
1980
October1st to 10thDay
20%36%5%13%23%4
1882
11th to 20thDay
22%35%5%15%17%5%
1800
21st to endDay
20%36%414%19%6%
1980
November1st to 10thDay
15%40%412%22%6%
1857
11th to 20thDay
20%40%414%17%5%
1739
21st to endDay
24%39%413%14%5%
1710
December1st to 10thDay
26%40%5%13%13%3
1710
11th to 20thDay
24%32%5%15%17%8%
2150
21st to endDay
30%26%5%20%18%2
3124
January1st to 10thNight
24%39%6%13%15%2
2459
11th to 20thNight
25%41%5%12%15%2
2367
21st to endNight
27%37%313%16%3
2574
February1st to 10thNight
27%36%5%13%14%5%
2340
11th to 20thNight
27%37%411%16%5%
2103
21st to endNight
27%37%6%12%14%4
1744
March1st to 10thNight
22%36%5%12%19%7%
1980
11th to 20thNight
28%36%8%12%12%4
1980
21st to endNight
29%38%8%13%11%2
2178
April1st to 10thNight
22%37%7%13%17%4
1980
11th to 20thNight
19%35%5%15%18%7%
1793
21st to endNight
24%36%7%14%15%3
1656
May1st to 10thNight
25%39%10%13%12%2
1620
11th to 20thNight
33%40%6%11%9%1
1593
21st to endNight
26%38%8%18%8%1
1745
June1st to 10thNight
27%40%9%14%9%1
1620
11th to 20thNight
28%40%10%15%6%2
1620
21st to endNight
26%40%10%12%8%3
1620
July1st to 10thNight
31%42%10%9%6%3
1575
11th to 20thNight
23%44%14%10%6%2
1566
21st to endNight
28%44%13%10%5%
1672
August1st to 10thNight
26%40%15%13%5%
1600
11th to 20thNight
30%39%11%12%7%1
1598
21st to endNight
31%41%11%12%41
1908
September1st to 10thNight
25%40%8%12%11%5%
1974
11th to 20thNight
28%39%8%10%15%1
1980
21st to endNight
27%37%7%10%15%4
1980
October1st to 10thNight
22%36%413%21%4
2077
11th to 20thNight
24%36%414%16%5%
2160
21st to endNight
21%37%413%18%6%
2376
November1st to 10thNight
16%40%412%18%10%
2221
11th to 20thNight
23%39%412%16%6%
2436
21st to endNight
23%39%312%17%5%
2470
December1st to 10thNight
26%39%6%12%14%4
2470
11th to 20thNight
27%32%5%11%17%7%
3044
21st to endNight
29%26%6%18%18%2
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
21%17%35%23%4
270
11th to 20thDay
22%18%31%21%7%
246
21st to endDay
21%18%37%16%7%
264
February1st to 10thDay
21%19%34%19%6%1
240
11th to 20thDay
33%17%34%13%3
240
21st to endDay
27%22%31%17%3
229
March1st to 10thDay
20%14%32%25%8%1
420
11th to 20thDay
20%13%39%21%7%
420
21st to endDay
22%12%34%24%6%1
462
April1st to 10thDay
18%14%32%22%13%2
420
11th to 20thDay
15%14%28%23%15%4
412
21st to endDay
18%8%26%25%16%6%
420
May1st to 10thDay
11%11%35%23%17%4
423
11th to 20thDay
16%419%27%24%11%
447
21st to endDay
14%313%24%30%16%
485
June1st to 10thDay
13%211%32%29%12%
450
11th to 20thDay
10%414%26%26%20%
450
21st to endDay
9%212%30%30%17%
450
July1st to 10thDay
10%27%20%33%28%
445
11th to 20thDay
8%28%25%34%24%
444
21st to endDay
6%17%28%36%21%
488
August1st to 10thDay
14%112%25%29%20%
446
11th to 20thDay
13%37%26%29%22%
439
21st to endDay
12%211%21%28%25%
495
September1st to 10thDay
12%211%21%31%24%
450
11th to 20thDay
16%311%21%31%19%
450
21st to endDay
21%220%23%26%8%
450
October1st to 10thDay
18%420%26%22%12%
450
11th to 20thDay
15%5%22%28%23%7%
450
21st to endDay
19%5%22%29%20%5%
495
November1st to 10thDay
20%6%22%29%18%4
455
11th to 20thDay
16%11%32%29%10%2
299
21st to endDay
10%9%37%27%14%3
270
December1st to 10thDay
25%10%33%24%7%1
270
11th to 20thDay
22%11%30%26%10%1
270
21st to endDay
26%14%32%19%8%1
297
January1st to 10thNight
20%12%32%29%6%
760
11th to 20thNight
21%10%34%30%6%
729
21st to endNight
19%9%39%31%3
792
February1st to 10thNight
19%9%34%34%4
720
11th to 20thNight
23%10%41%24%2
703
21st to endNight
21%13%37%26%4
592
March1st to 10thNight
16%10%33%36%5%
720
11th to 20thNight
17%11%34%29%8%1
720
21st to endNight
20%9%34%30%8%
792
April1st to 10thNight
16%12%32%32%8%
720
11th to 20thNight
14%12%29%29%17%
711
21st to endNight
15%6%27%35%16%
576
May1st to 10thNight
12%7%27%36%17%
540
11th to 20thNight
14%5%21%35%24%2
531
21st to endNight
16%212%31%36%3
584
June1st to 10thNight
12%112%40%31%4
540
11th to 20thNight
12%314%28%32%11%
540
21st to endNight
8%210%36%38%6%
540
July1st to 10thNight
9%28%29%42%10%
525
11th to 20thNight
8%27%28%46%9%
522
21st to endNight
7%19%31%44%7%
591
August1st to 10thNight
14%26%28%42%8%
537
11th to 20thNight
14%18%28%40%9%
534
21st to endNight
11%29%24%47%7%
720
September1st to 10thNight
10%28%29%44%7%
720
11th to 20thNight
17%213%23%37%8%
720
21st to endNight
19%315%32%29%2
720
October1st to 10thNight
17%417%29%27%7%
720
11th to 20thNight
16%5%23%31%22%3
720
21st to endNight
15%6%23%35%19%3
792
November1st to 10thNight
16%5%24%34%19%3
740
11th to 20thNight
14%9%29%36%11%1
760
21st to endNight
15%6%28%36%14%1
760
December1st to 10thNight
23%9%27%34%8%
760
11th to 20thNight
19%7%28%35%10%1
760
21st to endNight
24%8%28%32%8%
836
Page generated at 2024-01-10 01:25:04. Version ac07

Copyright 2024 Attilla Danko


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