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 2018-03-21.

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%
16434
18%
49225
13%
16394
54%
16394
25%
32174

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%
777
18%
2539
9%
776
44%
776
19%
1678
January16th to endNight
29%
832
22%
2704
11%
832
43%
832
22%
1721
February1st to 15thNight
31%
764
17%
2385
10%
761
41%
761
21%
1575
February16th to endNight
31%
683
22%
2049
11%
683
44%
683
24%
1298
March1st to 15thNight
39%
780
21%
2204
14%
780
48%
780
28%
1395
March16th to endNight
40%
792
20%
2124
12%
792
47%
792
28%
1424
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%
720
18%
1800
14%
720
62%
720
24%
1337
September16th to endNight
51%
717
13%
1935
12%
717
52%
717
19%
1450
October1st to 15thNight
52%
720
23%
2160
21%
720
57%
720
27%
1383
October16th to endNight
48%
768
30%
2304
23%
768
59%
768
31%
1382
November1st to 15thNight
48%
760
18%
2382
15%
760
54%
760
24%
1564
November16th to endNight
45%
780
22%
2535
16%
780
54%
780
24%
1574
December1st to 15thNight
37%
780
18%
2675
12%
780
47%
780
20%
1745
December16th to endNight
35%
832
18%
2912
11%
832
47%
832
20%
1858

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%
49602
Night
13%6%25%5%3445%7%41%
49415
Cloud CoverDay
12%5%2442445%8%42%
49612
Night
13%6%25%43445%7%41%
49419
TransparencyDay
38%7%15%22%13%2
49311
Night
41%6%13%20%14%2
49225
SeeingDay
15%417%24%27%10%
6609
Night
16%6%19%28%22%5%
16438

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%5%345%45%42%
1727
16th to endDay
15%5%35%424436%42%
1872
February1st to 15thDay
16%6%2443345%7%40%
1805
16th to endDay
12%5%2442435%8%45%
1710
March1st to 15thDay
13%5%14323347%50%
2072
16th to endDay
16%5%24414446%44%
2227
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%35%45%7%39%
2160
16th to endDay
19%8%36%5%34445%33%
2021
October1st to 15thDay
15%6%24434345%45%
1800
16th to endDay
12%414424336%51%
1920
November1st to 15thDay
16%6%23423445%45%
1803
16th to endDay
12%42332345%7%50%
1755
December1st to 15thDay
14%7%36%5%25%45%6%39%
1614
16th to endDay
17%424334346%44%
1664
January1st to 15thNight
12%7%35%5%3445%6%40%
2539
16th to endNight
16%6%24424346%43%
2704
February1st to 15thNight
19%6%24323445%41%
2384
16th to endNight
13%6%25%424446%45%
2049
March1st to 15thNight
11%5%2442445%7%47%
2192
16th to endNight
14%5%3443346%7%42%
2124
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%
1800
16th to endNight
20%6%36%5%345%5%6%31%
1935
October1st to 15thNight
16%6%2442335%6%43%
2160
16th to endNight
13%5%14423335%51%
2304
November1st to 15thNight
16%7%25%422447%42%
2382
16th to endNight
14%5%25%424346%45%
2535
December1st to 15thNight
15%7%35%434447%39%
2675
16th to endNight
14%7%25%5%34446%40%
2912

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%
1727
16th to endDay
15%6%25%5%24446%42%
1872
February1st to 15thDay
16%7%245%24447%39%
1805
16th to endDay
12%5%2442445%7%45%
1710
March1st to 15thDay
12%5%24423246%50%
2083
16th to endDay
17%5%24323447%43%
2226
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%6%25%6%345%5%7%39%
2160
16th to endDay
20%7%36%6%34445%32%
2021
October1st to 15thDay
14%6%25%425%245%45%
1800
16th to endDay
13%41342335%6%51%
1920
November1st to 15thDay
16%6%24424346%44%
1803
16th to endDay
13%42332345%7%49%
1755
December1st to 15thDay
15%7%46%5%25%445%38%
1614
16th to endDay
17%434334345%44%
1664
January1st to 15thNight
12%7%35%5%35%5%5%7%39%
2539
16th to endNight
16%6%24424346%43%
2704
February1st to 15thNight
18%7%25%323446%41%
2377
16th to endNight
13%6%25%5%24445%45%
2049
March1st to 15thNight
11%6%2342445%7%46%
2204
16th to endNight
14%5%2442445%7%41%
2124
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%
1800
16th to endNight
20%7%26%5%4445%6%31%
1935
October1st to 15thNight
16%6%25%43325%7%43%
2160
16th to endNight
14%5%23324335%51%
2304
November1st to 15thNight
16%7%24423447%42%
2382
16th to endNight
14%5%25%423347%45%
2535
December1st to 15thNight
15%7%35%42445%6%39%
2675
16th to endNight
14%7%25%5%34446%40%
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
43%7%12%18%14%2
1728
16th to endDay
44%39%22%15%4
1872
February1st to 15thDay
45%410%21%15%3
1808
16th to endDay
37%5%13%25%14%2
1710
March1st to 15thDay
36%5%13%22%17%4
2083
16th to endDay
41%6%12%20%16%2
2227
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
42%10%15%17%12%1
2160
16th to endDay
53%7%10%16%12%1
2021
October1st to 15thDay
41%410%22%20%1
1800
16th to endDay
34%5%8%24%23%3
1920
November1st to 15thDay
41%5%11%17%20%3
1803
16th to endDay
35%412%22%20%4
1755
December1st to 15thDay
48%5%13%18%12%3
1614
16th to endDay
42%413%20%15%3
1664
January1st to 15thNight
44%6%12%18%15%2
2539
16th to endNight
43%410%21%15%5%
2704
February1st to 15thNight
44%5%9%18%17%4
2385
16th to endNight
40%411%20%17%4
2049
March1st to 15thNight
36%6%11%25%16%3
2204
16th to endNight
40%6%12%20%16%3
2124
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%17%12%
1800
16th to endNight
53%7%12%16%10%
1935
October1st to 15thNight
40%5%9%23%19%2
2160
16th to endNight
35%47%23%23%5%
2304
November1st to 15thNight
43%5%11%16%19%4
2382
16th to endNight
40%49%19%19%5%
2535
December1st to 15thNight
45%5%12%19%14%2
2675
16th to endNight
43%5%14%20%13%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
19%13%34%22%9%
131
16th to endDay
20%6%34%27%10%1
144
February1st to 15thDay
22%9%34%25%8%
231
16th to endDay
12%9%36%29%9%3
291
March1st to 15thDay
15%12%33%24%12%1
330
16th to endDay
19%5%27%28%14%3
311
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
13%37%22%36%16%
315
16th to endDay
25%210%24%27%9%
314
October1st to 15thDay
22%314%22%28%7%
315
16th to endDay
11%5%18%25%26%12%
336
November1st to 15thDay
22%5%21%24%21%4
301
16th to endDay
14%6%25%28%22%3
285
December1st to 15thDay
22%5%33%22%13%2
144
16th to endDay
25%7%27%27%13%
96
January1st to 15thNight
15%16%28%24%13%1
780
16th to endNight
19%12%32%27%6%
832
February1st to 15thNight
22%10%30%30%6%
764
16th to endNight
16%13%32%26%10%
683
March1st to 15thNight
14%11%29%31%11%1
780
16th to endNight
16%8%27%29%13%3
792
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%21%38%14%
720
16th to endNight
23%29%26%30%7%
717
October1st to 15thNight
18%215%25%29%8%
720
16th to endNight
17%6%22%25%22%6%
768
November1st to 15thNight
19%418%32%20%5%
760
16th to endNight
16%10%20%30%20%1
780
December1st to 15thNight
19%9%26%26%16%1
780
16th to endNight
19%9%28%31%9%
832
Page generated at 2018-03-22 11:34:26. Version ac04

Copyright 2018 A. Danko


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