Ocracoke Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Ocracoke Campground clear sky chart from 2005-11-05 to

2017-09-12
.

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
48%
15673
18%
46864
12%
15633
54%
15633
25%
30651

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
33%
717
18%
2343
9%
716
45%
716
19%
1551
January16th to endNight
28%
768
21%
2496
10%
768
43%
768
22%
1591
February1st to 15thNight
31%
704
17%
2198
10%
701
41%
701
22%
1439
February16th to endNight
29%
631
22%
1893
10%
631
43%
631
24%
1206
March1st to 15thNight
41%
720
21%
2034
14%
720
50%
720
29%
1289
March16th to endNight
40%
768
19%
2058
12%
768
46%
768
28%
1380
April1st to 15thNight
46%
718
21%
1796
10%
718
52%
718
35%
1161
April16th to endNight
53%
720
20%
1800
9%
720
56%
720
33%
1179
May1st to 15thNight
54%
720
15%
1800
9%
720
56%
720
31%
1231
May16th to endNight
62%
452
17%
1575
16%
452
64%
452
29%
913
June1st to 15thNight
66%
360
13%
1440
17%
360
67%
360
23%
881
June16th to endNight
69%
360
14%
1440
18%
360
70%
360
23%
859
July1st to 15thNight
68%
415
10%
1435
11%
415
68%
415
24%
898
July16th to endNight
68%
564
11%
1595
9%
531
70%
531
24%
1073
August1st to 15thNight
65%
656
11%
1726
8%
653
66%
653
26%
1206
August16th to endNight
63%
764
13%
1910
8%
764
63%
764
24%
1389
September1st to 15thNight
61%
707
18%
1768
13%
707
62%
707
24%
1314
September16th to endNight
51%
657
13%
1774
11%
657
52%
657
19%
1333
October1st to 15thNight
52%
660
24%
1980
23%
660
57%
660
28%
1256
October16th to endNight
47%
704
29%
2112
22%
704
58%
704
30%
1275
November1st to 15thNight
47%
700
19%
2194
16%
700
54%
700
24%
1432
November16th to endNight
45%
720
21%
2340
15%
720
53%
720
23%
1466
December1st to 15thNight
37%
720
18%
2469
11%
720
46%
720
19%
1617
December16th to endNight
35%
768
19%
2688
11%
768
47%
768
20%
1712

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
12%5%2442445%8%43%
47774
Night
13%5%25%5%3445%7%41%
47054
Cloud CoverDay
12%5%2442446%8%42%
47784
Night
13%6%25%43445%7%41%
47058
TransparencyDay
38%7%15%22%13%2
47483
Night
41%6%13%20%14%2
46864
SeeingDay
15%417%24%27%10%
5966
Night
16%6%19%28%22%5%
15677

By Month

Percentage Cloud Cover NE (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
12%6%35%4345%5%5%42%
1593
16th to endDay
15%5%35%424436%41%
1728
February1st to 15thDay
16%6%2443345%6%40%
1662
16th to endDay
12%5%2433435%8%45%
1580
March1st to 15thDay
13%5%14323347%50%
1912
16th to endDay
16%5%24414446%44%
2165
April1st to 15thDay
10%4144245%5%7%50%
2152
16th to endDay
9%4144245%6%7%49%
2160
May1st to 15thDay
10%5%345%26%5%5%9%43%
2152
16th to endDay
8%424415%46%9%47%
2545
June1st to 15thDay
9%415%426%5%7%10%42%
2520
16th to endDay
7%3246%36%6%7%11%40%
2520
July1st to 15thDay
9%4243245%8%12%40%
2436
16th to endDay
6%5%25%6%35%6%7%12%37%
2465
August1st to 15thDay
12%424435%5%6%11%38%
2210
16th to endDay
12%5%36%7%35%5%7%9%33%
2292
September1st to 15thDay
13%5%25%6%25%45%7%39%
2112
16th to endDay
20%8%36%5%44445%32%
1853
October1st to 15thDay
14%6%24425%345%46%
1650
16th to endDay
13%414424346%50%
1760
November1st to 15thDay
16%5%23423445%46%
1661
16th to endDay
13%42432345%7%49%
1620
December1st to 15thDay
13%7%36%5%25%45%6%38%
1490
16th to endDay
16%425%324345%45%
1536
January1st to 15thNight
11%7%35%5%345%5%6%40%
2343
16th to endNight
16%6%25%423347%42%
2496
February1st to 15thNight
19%6%243235%45%42%
2197
16th to endNight
13%6%15%424436%45%
1893
March1st to 15thNight
11%5%2342445%7%46%
2022
16th to endNight
14%5%3443346%8%42%
2058
April1st to 15thNight
9%6%2442445%6%49%
1796
16th to endNight
11%4245%2445%7%46%
1800
May1st to 15thNight
12%5%245%345%6%9%41%
1800
16th to endNight
11%42443335%9%46%
1573
June1st to 15thNight
10%425%435%6%6%9%41%
1440
16th to endNight
8%4245%25%5%7%12%41%
1440
July1st to 15thNight
10%425%426%6%8%12%36%
1521
16th to endNight
8%5%35%6%35%6%8%11%34%
1703
August1st to 15thNight
10%426%6%35%6%8%12%32%
1737
16th to endNight
12%7%25%7%35%5%6%9%34%
1910
September1st to 15thNight
14%5%25%5%5%5%6%5%8%34%
1768
16th to endNight
20%6%36%5%345%46%31%
1774
October1st to 15thNight
16%6%245%23346%44%
1980
16th to endNight
14%5%24423335%51%
2112
November1st to 15thNight
16%6%25%422446%43%
2194
16th to endNight
15%5%25%424346%45%
2340
December1st to 15thNight
14%7%35%43445%7%38%
2469
16th to endNight
14%7%25%5%34446%41%
2688

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
12%7%35%5%345%46%41%
1593
16th to endDay
15%7%35%5%24446%41%
1728
February1st to 15thDay
16%6%245%245%47%40%
1662
16th to endDay
12%5%2442445%7%45%
1580
March1st to 15thDay
13%5%2332325%7%50%
1923
16th to endDay
18%5%24323447%44%
2164
April1st to 15thDay
10%424324447%50%
2152
16th to endDay
9%42442446%8%49%
2160
May1st to 15thDay
10%5%24435%46%9%42%
2152
16th to endDay
9%41442446%9%46%
2545
June1st to 15thDay
8%424435%5%7%10%43%
2520
16th to endDay
7%3245%36%6%7%10%41%
2520
July1st to 15thDay
9%5%243246%8%12%40%
2436
16th to endDay
6%5%35%6%36%5%8%11%37%
2465
August1st to 15thDay
12%5%14435%5%7%10%38%
2210
16th to endDay
12%6%26%6%35%48%9%33%
2292
September1st to 15thDay
13%5%25%6%345%5%7%39%
2112
16th to endDay
20%8%36%6%34445%31%
1853
October1st to 15thDay
14%5%34425%245%46%
1650
16th to endDay
13%41341335%6%50%
1760
November1st to 15thDay
16%5%14424346%45%
1661
16th to endDay
14%42432345%7%48%
1620
December1st to 15thDay
14%7%46%6%25%45%6%37%
1490
16th to endDay
16%434334345%44%
1536
January1st to 15thNight
12%7%35%5%35%5%5%7%39%
2343
16th to endNight
16%6%25%424346%42%
2496
February1st to 15thNight
18%7%25%323446%41%
2190
16th to endNight
14%6%245%24445%45%
1893
March1st to 15thNight
10%6%2342445%8%46%
2034
16th to endNight
14%5%2442345%7%41%
2058
April1st to 15thNight
10%6%15%32445%7%48%
1796
16th to endNight
11%42443446%7%46%
1800
May1st to 15thNight
11%6%245%3445%9%41%
1799
16th to endNight
11%5%2442336%9%46%
1573
June1st to 15thNight
10%4245%36%5%6%9%41%
1440
16th to endNight
7%5%236%35%5%6%11%41%
1440
July1st to 15thNight
9%5%25%5%35%6%7%12%36%
1521
16th to endNight
8%5%35%5%46%6%7%12%33%
1703
August1st to 15thNight
10%5%26%6%35%6%7%11%33%
1737
16th to endNight
12%7%25%6%35%5%7%9%34%
1910
September1st to 15thNight
15%5%35%6%35%5%7%7%34%
1768
16th to endNight
20%8%26%5%4445%6%31%
1774
October1st to 15thNight
16%6%2443325%6%44%
1980
16th to endNight
14%5%23324335%51%
2112
November1st to 15thNight
17%7%24423346%43%
2194
16th to endNight
15%5%25%424347%44%
2340
December1st to 15thNight
14%7%35%42445%7%38%
2469
16th to endNight
14%7%25%5%34447%41%
2688

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
44%7%12%18%14%2
1594
16th to endDay
45%39%22%15%3
1728
February1st to 15thDay
44%410%21%16%3
1665
16th to endDay
38%5%13%25%14%2
1580
March1st to 15thDay
35%6%14%22%16%4
1923
16th to endDay
41%6%12%20%16%2
2165
April1st to 15thDay
33%5%13%25%18%3
2152
16th to endDay
32%6%14%25%17%4
2160
May1st to 15thDay
37%8%18%22%12%
2152
16th to endDay
33%8%18%28%9%
2549
June1st to 15thDay
34%9%20%25%10%
2520
16th to endDay
33%12%20%24%8%
2520
July1st to 15thDay
31%11%24%24%7%
2294
16th to endDay
35%11%22%23%7%
2310
August1st to 15thDay
38%10%21%18%9%
2197
16th to endDay
45%10%17%19%6%
2292
September1st to 15thDay
41%10%15%16%13%1
2112
16th to endDay
53%7%9%15%12%1
1853
October1st to 15thDay
40%410%22%19%1
1650
16th to endDay
34%5%9%25%22%3
1760
November1st to 15thDay
40%5%10%17%22%3
1661
16th to endDay
36%312%22%19%4
1620
December1st to 15thDay
47%5%13%17%12%3
1490
16th to endDay
41%413%20%16%3
1536
January1st to 15thNight
44%6%12%18%14%2
2343
16th to endNight
43%310%22%15%4
2496
February1st to 15thNight
44%5%9%18%18%4
2198
16th to endNight
41%411%20%17%4
1893
March1st to 15thNight
36%6%12%25%15%3
2034
16th to endNight
40%6%12%21%16%3
2058
April1st to 15thNight
35%414%22%19%3
1796
16th to endNight
35%7%13%23%14%5%
1800
May1st to 15thNight
39%7%15%22%13%
1800
16th to endNight
34%6%18%28%11%1
1575
June1st to 15thNight
37%9%19%23%9%
1440
16th to endNight
34%10%22%22%9%
1440
July1st to 15thNight
37%9%24%19%8%
1435
16th to endNight
38%12%20%21%6%
1595
August1st to 15thNight
41%10%22%17%8%
1726
16th to endNight
44%10%16%20%8%
1910
September1st to 15thNight
46%10%13%16%12%
1768
16th to endNight
53%7%11%16%11%
1774
October1st to 15thNight
40%49%23%20%2
1980
16th to endNight
36%48%24%21%5%
2112
November1st to 15thNight
43%5%10%16%20%4
2194
16th to endNight
41%5%9%19%18%5%
2340
December1st to 15thNight
45%5%13%18%14%2
2469
16th to endNight
43%5%13%19%13%3
2688

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
25%6%34%25%6%1
87
16th to endDay
19%5%41%26%6%1
96
February1st to 15thDay
21%11%35%24%7%
178
16th to endDay
12%10%38%29%8%1
239
March1st to 15thDay
13%11%31%27%15%1
270
16th to endDay
20%5%26%28%15%3
288
April1st to 15thDay
14%9%26%22%20%7%
270
16th to endDay
10%319%33%29%4
270
May1st to 15thDay
13%318%39%19%5%
288
16th to endDay
12%19%23%29%23%
331
June1st to 15thDay
13%10%23%32%19%
315
16th to endDay
9%19%25%38%15%
315
July1st to 15thDay
8%15%20%47%16%
305
16th to endDay
7%1417%49%18%
326
August1st to 15thDay
15%320%39%19%
313
16th to endDay
15%3314%43%18%
332
September1st to 15thDay
14%27%23%36%16%
299
16th to endDay
26%28%25%26%9%
254
October1st to 15thDay
23%316%26%22%7%
255
16th to endDay
12%419%25%26%10%
272
November1st to 15thDay
21%6%23%25%18%4
249
16th to endDay
16%7%26%25%20%2
240
December1st to 15thDay
19%6%33%23%14%2
110
16th to endDay
26%6%23%25%18%
64
January1st to 15thNight
15%16%28%25%13%1
720
16th to endNight
19%13%32%27%6%
768
February1st to 15thNight
22%10%31%30%5%
704
16th to endNight
17%14%32%26%9%
631
March1st to 15thNight
13%10%29%32%12%1
720
16th to endNight
16%8%27%29%14%3
768
April1st to 15thNight
12%6%29%30%17%3
718
16th to endNight
14%5%20%32%23%3
720
May1st to 15thNight
15%319%36%20%5%
720
16th to endNight
14%213%27%28%14%
453
June1st to 15thNight
10%111%30%35%10%
360
16th to endNight
8%27%35%36%9%
360
July1st to 15thNight
11%15%30%40%11%
415
16th to endNight
9%2424%47%10%
564
August1st to 15thNight
12%1429%41%10%
656
16th to endNight
14%2319%41%18%
764
September1st to 15thNight
17%25%20%38%14%
707
16th to endNight
23%28%26%30%7%
657
October1st to 15thNight
18%315%25%28%7%
660
16th to endNight
17%6%22%26%20%6%
704
November1st to 15thNight
19%5%18%33%19%4
700
16th to endNight
16%10%20%30%20%1
720
December1st to 15thNight
18%9%27%26%15%1
720
16th to endNight
19%10%28%30%10%
768
Page generated at 2017-09-13 07:39:03. Version ac04

Copyright 2017 A. Danko


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