Mocksville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mocksville clear sky chart from 2005-11-05 to 2019-06-24.

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
49%
18174
22%
53998
15%
18136
57%
18136
28%
34220

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
31%
838
24%
2717
12%
836
47%
836
25%
1643
January16th to endNight
32%
896
26%
2912
15%
896
47%
896
27%
1732
February1st to 15thNight
32%
821
22%
2661
12%
821
45%
821
25%
1629
February16th to endNight
28%
735
26%
2159
12%
735
42%
735
26%
1363
March1st to 15thNight
34%
840
26%
2310
13%
840
44%
840
29%
1461
March16th to endNight
38%
896
20%
2464
11%
896
45%
896
26%
1646
April1st to 15thNight
40%
838
23%
2216
10%
838
48%
838
33%
1393
April16th to endNight
44%
747
22%
1993
11%
747
51%
747
31%
1293
May1st to 15thNight
52%
630
17%
1890
10%
630
58%
630
27%
1229
May16th to endNight
63%
657
17%
1972
13%
657
65%
657
28%
1281
June1st to 15thNight
65%
630
16%
1890
14%
630
67%
630
26%
1251
June16th to endNight
70%
609
16%
1828
15%
609
71%
609
30%
1162
July1st to 15thNight
75%
555
14%
1665
13%
555
75%
555
27%
1091
July16th to endNight
73%
612
14%
1739
11%
579
74%
579
27%
1159
August1st to 15thNight
67%
575
14%
1715
12%
572
67%
572
23%
1207
August16th to endNight
71%
730
17%
1972
14%
730
72%
730
28%
1342
September1st to 15thNight
66%
780
19%
2086
16%
780
67%
780
30%
1366
September16th to endNight
54%
777
19%
2145
16%
777
57%
777
23%
1514
October1st to 15thNight
57%
780
28%
2307
27%
780
63%
780
31%
1409
October16th to endNight
51%
832
33%
2496
24%
832
65%
832
37%
1399
November1st to 15thNight
50%
820
28%
2489
22%
820
59%
820
32%
1480
November16th to endNight
48%
840
28%
2730
22%
840
58%
840
32%
1526
December1st to 15thNight
38%
840
23%
2730
14%
840
49%
840
24%
1740
December16th to endNight
36%
896
22%
2912
14%
896
47%
896
22%
1904

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%2443445%7%43%
54816
Night
14%5%2442445%7%44%
54195
TransparencyDay
38%7%12%21%16%4
54517
Night
38%6%11%20%18%4
53998
SeeingDay
16%418%23%21%14%
7979
Night
16%422%32%21%2
18181

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
18%5%34423445%44%
1881
16th to endDay
15%423324445%49%
2016
February1st to 15thDay
16%5%2342345%6%44%
1858
16th to endDay
16%6%34324347%44%
1885
March1st to 15thDay
16%41333335%7%46%
2310
16th to endDay
16%5%24324447%44%
2463
April1st to 15thDay
12%413413448%50%
2390
16th to endDay
14%424425%445%46%
2583
May1st to 15thDay
12%5%25%435%47%7%40%
2721
16th to endDay
11%5%25%5%3436%8%42%
2847
June1st to 15thDay
10%4145%36%6%7%9%40%
2730
16th to endDay
5%425%5%35%6%7%10%41%
2639
July1st to 15thDay
8%5%26%7%36%6%7%10%34%
2535
16th to endDay
7%5%35%7%47%7%7%11%33%
2673
August1st to 15thDay
10%5%36%6%46%7%8%9%31%
2487
16th to endDay
9%5%26%6%46%5%7%10%36%
2568
September1st to 15thDay
11%42443446%9%43%
2200
16th to endDay
19%6%25%424446%38%
2145
October1st to 15thDay
15%5%1421234453%
1983
16th to endDay
12%41331233457%
2080
November1st to 15thDay
16%323322335%53%
2026
16th to endDay
14%424323346%51%
1890
December1st to 15thDay
18%6%23323446%43%
1890
16th to endDay
20%7%24324345%41%
2016
January1st to 15thNight
17%42442333449%
2717
16th to endNight
16%414323335%49%
2912
February1st to 15thNight
16%5%24414445%47%
2652
16th to endNight
16%5%2432335%7%45%
2159
March1st to 15thNight
14%5%24433345%47%
2310
16th to endNight
16%424435%446%42%
2464
April1st to 15thNight
13%5%2442335%8%48%
2216
16th to endNight
14%425%423447%46%
1993
May1st to 15thNight
12%5%25%4345%6%7%42%
1889
16th to endNight
11%4244345%7%10%40%
1970
June1st to 15thNight
10%425%6%36%5%7%10%38%
1890
16th to endNight
5%425%6%36%5%7%11%41%
1828
July1st to 15thNight
8%424445%8%7%12%36%
1755
16th to endNight
6%4247%47%6%8%12%34%
1847
August1st to 15thNight
12%435%5%35%7%6%11%33%
1726
16th to endNight
8%5%25%5%36%6%7%11%37%
1972
September1st to 15thNight
10%5%24435%5%5%8%43%
2086
16th to endNight
17%6%25%5%3445%7%36%
2145
October1st to 15thNight
14%6%14324336%49%
2307
16th to endNight
11%42332333458%
2496
November1st to 15thNight
17%313323335%52%
2489
16th to endNight
13%322313446%52%
2730
December1st to 15thNight
18%6%24423435%43%
2730
16th to endNight
21%6%24323446%39%
2912

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
41%48%21%19%5%
1882
16th to endDay
36%37%24%20%7%
2016
February1st to 15thDay
39%5%9%21%19%4
1860
16th to endDay
40%410%23%16%4
1885
March1st to 15thDay
37%49%22%20%6%
2310
16th to endDay
39%7%10%20%18%3
2464
April1st to 15thDay
32%412%26%19%5%
2390
16th to endDay
37%6%9%21%17%7%
2583
May1st to 15thDay
39%8%16%20%11%3
2721
16th to endDay
38%7%15%23%12%2
2851
June1st to 15thDay
35%10%15%23%13%
2730
16th to endDay
34%10%17%21%13%2
2639
July1st to 15thDay
40%10%16%17%11%3
2396
16th to endDay
40%11%16%20%9%
2518
August1st to 15thDay
43%10%16%19%9%
2474
16th to endDay
40%10%17%20%9%1
2568
September1st to 15thDay
36%9%15%19%17%3
2200
16th to endDay
46%6%9%16%18%2
2145
October1st to 15thDay
33%5%9%25%20%5%
1983
16th to endDay
31%36%25%25%8%
2080
November1st to 15thDay
35%37%18%27%7%
2026
16th to endDay
33%48%22%25%5%
1890
December1st to 15thDay
41%48%21%18%4
1890
16th to endDay
44%311%19%17%3
2016
January1st to 15thNight
39%38%17%23%7%
2717
16th to endNight
38%37%22%22%6%
2912
February1st to 15thNight
38%48%22%20%4
2661
16th to endNight
38%5%10%22%18%4
2159
March1st to 15thNight
38%48%20%21%6%
2310
16th to endNight
41%6%8%21%18%4
2464
April1st to 15thNight
35%410%23%20%5%
2216
16th to endNight
38%410%18%19%8%
1993
May1st to 15thNight
38%8%13%21%15%2
1890
16th to endNight
36%9%14%25%12%1
1972
June1st to 15thNight
37%10%15%22%12%1
1890
16th to endNight
34%9%18%21%12%3
1828
July1st to 15thNight
35%11%16%21%11%3
1665
16th to endNight
37%11%20%19%9%2
1739
August1st to 15thNight
41%12%18%15%12%1
1715
16th to endNight
37%11%16%22%10%1
1972
September1st to 15thNight
36%8%16%18%15%3
2086
16th to endNight
46%7%10%14%17%3
2145
October1st to 15thNight
35%5%8%24%20%5%
2307
16th to endNight
30%35%23%27%9%
2496
November1st to 15thNight
35%36%19%23%10%
2489
16th to endNight
31%47%22%26%7%
2730
December1st to 15thNight
43%49%18%19%5%
2730
16th to endNight
44%5%9%18%18%3
2912

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
22%12%33%23%7%
180
16th to endDay
18%15%31%22%10%1
192
February1st to 15thDay
20%9%38%20%11%
180
16th to endDay
27%7%34%23%6%
204
March1st to 15thDay
22%9%32%26%8%
390
16th to endDay
16%5%32%31%12%
416
April1st to 15thDay
18%10%24%26%17%3
390
16th to endDay
16%5%20%27%22%8%
379
May1st to 15thDay
14%5%22%25%20%11%
408
16th to endDay
18%111%17%29%21%
459
June1st to 15thDay
13%114%20%28%22%
435
16th to endDay
9%29%23%29%25%
407
July1st to 15thDay
9%8%20%27%33%
365
16th to endDay
10%1421%31%31%
390
August1st to 15thDay
12%16%20%30%28%
358
16th to endDay
10%16%19%28%34%
396
September1st to 15thDay
15%18%16%26%32%
375
16th to endDay
24%19%23%24%16%
374
October1st to 15thDay
20%114%26%23%13%
375
16th to endDay
13%5%20%29%22%9%
400
November1st to 15thDay
26%221%25%17%6%
354
16th to endDay
10%7%27%21%23%10%
180
December1st to 15thDay
23%6%27%31%10%1
180
16th to endDay
28%8%31%23%7%
192
January1st to 15thNight
19%9%33%30%7%
840
16th to endNight
19%8%36%31%4
896
February1st to 15thNight
20%9%33%33%3
824
16th to endNight
19%10%36%28%3
735
March1st to 15thNight
19%7%33%32%6%
840
16th to endNight
19%6%30%33%9%
896
April1st to 15thNight
15%9%30%32%11%
838
16th to endNight
17%6%25%32%17%
747
May1st to 15thNight
12%423%35%22%1
630
16th to endNight
13%111%33%36%3
659
June1st to 15thNight
11%111%33%36%5%
630
16th to endNight
6%110%29%45%7%
609
July1st to 15thNight
10%15%30%46%7%
555
16th to endNight
7%6%27%47%11%
612
August1st to 15thNight
13%7%27%42%8%
575
16th to endNight
10%6%26%46%9%
730
September1st to 15thNight
12%28%28%40%8%
780
16th to endNight
20%212%27%32%4
777
October1st to 15thNight
17%315%30%27%5%
780
16th to endNight
13%326%33%20%2
832
November1st to 15thNight
19%321%37%15%2
820
16th to endNight
15%6%25%35%16%
840
December1st to 15thNight
22%426%35%10%
840
16th to endNight
24%427%36%6%
896
Page generated at 2019-06-24 20:41:28. Version ac04

Copyright 2019 A. Danko


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