Shallotte
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Shallotte clear sky chart from 2005-11-06 to 2024-11-25.

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
52%
25721
8%
97410
5%
25497
54%
25497
7%
76219

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
33%
751
15%
3998
4%
737
39%
737
4%
2777
January11th to 20thNight
40%
754
16%
3984
6%
740
46%
740
5%
2843
January21st to endNight
32%
828
8%
4439
4%
814
39%
814
5%
3193
February1st to 10thNight
37%
760
8%
2470
6%
760
41%
760
7%
2112
February11th to 20thNight
32%
742
7%
2321
3%
740
37%
740
5%
2017
February21st to endNight
36%
628
6%
1737
4%
628
38%
628
6%
1537
March1st to 10thNight
39%
757
5%
3418
5%
745
42%
745
4%
2998
March11th to 20thNight
41%
748
20%
3416
5%
740
43%
740
5%
2240
March21st to endNight
43%
827
7%
3708
4%
814
46%
814
6%
2625
April1st to 10thNight
44%
760
9%
1961
4%
760
47%
760
8%
1694
April11th to 20thNight
50%
751
5%
1875
2%
751
52%
751
8%
1650
April21st to endNight
57%
760
9%
1900
5%
760
57%
760
11%
1621
May1st to 10thNight
55%
728
11%
3055
4%
725
56%
725
7%
2212
May11th to 20thNight
56%
550
9%
2765
4%
541
57%
541
5%
2036
May21st to endNight
69%
596
6%
3053
5%
593
70%
593
5%
1972
June1st to 10thNight
59%
570
4%
1710
4%
570
59%
570
7%
1499
June11th to 20thNight
69%
570
4%
1710
4%
570
69%
570
9%
1442
June21st to endNight
69%
570
3%
1710
3%
570
69%
570
8%
1480
July1st to 10thNight
68%
538
6%
2725
2%
535
69%
535
5%
2063
July11th to 20thNight
71%
535
2%
2786
3%
533
71%
533
5%
2148
July21st to endNight
71%
605
5%
2926
5%
569
72%
569
5%
2379
August1st to 10thNight
66%
557
2%
2805
1%
545
68%
545
4%
2324
August11th to 20thNight
65%
679
5%
2789
4%
675
66%
675
6%
2015
August21st to endNight
68%
816
10%
3099
4%
814
68%
814
8%
2094
September1st to 10thNight
69%
760
5%
1900
4%
760
69%
760
10%
1630
September11th to 20thNight
64%
760
7%
1990
6%
760
65%
760
8%
1757
September21st to endNight
56%
760
6%
2152
6%
760
56%
760
8%
1869
October1st to 10thNight
59%
760
5%
2971
7%
740
60%
740
6%
2528
October11th to 20thNight
59%
760
11%
2268
10%
740
63%
740
11%
1872
October21st to endNight
58%
836
11%
2813
12%
814
60%
814
10%
2253
November1st to 10thNight
55%
780
11%
2341
9%
780
58%
780
9%
1949
November11th to 20thNight
44%
800
11%
2400
7%
800
49%
800
10%
1991
November21st to endNight
50%
779
12%
2406
8%
779
54%
779
11%
1936
December1st to 10thNight
39%
760
8%
2470
4%
760
43%
760
6%
2153
December11th to 20thNight
41%
759
14%
2933
9%
758
45%
758
8%
2223
December21st to endNight
36%
827
6%
4406
4%
817
38%
817
4%
3087

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
11%6%26%5%45%46%8%42%
101204
Night
11%6%26%445%46%8%43%
98215
TransparencyDay
21%49%8%11%9%3
104849
Night
20%49%7%11%10%4
102708
SeeingDay
12%5%19%29%26%9%
15814
Night
13%5%21%31%24%5%
25919

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
14%5%25%34336%8%47%
2836
11th to 20thDay
10%5%26%445%35%8%48%
2840
21st to endDay
14%8%37%5%43345%43%
3124
February1st to 10thDay
15%7%27%5%4436%6%41%
1710
11th to 20thDay
18%6%26%433346%46%
1745
21st to endDay
14%7%36%445%35%7%42%
1713
March1st to 10thDay
20%9%48%434345%36%
3435
11th to 20thDay
9%425%43446%7%53%
3480
21st to endDay
15%6%36%5%44345%46%
3815
April1st to 10thDay
9%5%244345%6%7%52%
2218
11th to 20thDay
9%5%1434445%8%53%
2254
21st to endDay
8%414335%46%7%55%
2280
May1st to 10thDay
6%5%27%45%5%5%8%10%42%
3829
11th to 20thDay
13%7%38%5%5%5%46%8%38%
4081
21st to endDay
6%425%446%5%8%11%46%
4476
June1st to 10thDay
9%7%27%5%5%6%5%8%11%34%
2470
11th to 20thDay
8%5%25%45%6%5%8%12%40%
2470
21st to endDay
7%6%27%6%5%6%6%9%12%35%
2470
July1st to 10thDay
9%6%38%5%6%7%5%9%12%30%
4120
11th to 20thDay
7%6%39%6%7%7%7%9%11%30%
4120
21st to endDay
7%7%38%6%7%7%6%9%12%28%
4466
August1st to 10thDay
21%10%49%445%47%10%21%
4104
11th to 20thDay
7%6%27%6%46%6%9%12%36%
3777
21st to endDay
6%6%37%5%5%5%5%7%10%41%
4180
September1st to 10thDay
10%5%26%6%5%5%5%6%9%39%
2280
11th to 20thDay
14%7%26%6%5%446%9%37%
2185
21st to endDay
15%7%37%445%447%38%
2028
October1st to 10thDay
12%5%37%5%45%45%5%45%
1900
11th to 20thDay
9%424433447%57%
1900
21st to endDay
9%5%1443335%5%57%
2090
November1st to 10thDay
12%5%15%343445%54%
1957
11th to 20thDay
12%6%25%5%44345%50%
2000
21st to endDay
10%6%25%5%43346%52%
1864
December1st to 10thDay
13%7%37%5%5%446%7%38%
1710
11th to 20thDay
15%5%24333245%55%
2153
21st to endDay
15%9%26%44436%6%41%
3124
January1st to 10thNight
13%7%36%34435%7%45%
4109
11th to 20thNight
12%6%26%45%5%46%7%42%
4120
21st to endNight
13%8%37%5%4435%5%44%
4532
February1st to 10thNight
15%6%26%44335%6%45%
2470
11th to 20thNight
17%8%25%43445%6%42%
2319
21st to endNight
15%6%27%5%3435%7%42%
1737
March1st to 10thNight
21%12%47%434346%32%
3418
11th to 20thNight
11%5%25%5%3446%8%46%
3480
21st to endNight
14%425%445%35%6%49%
3817
April1st to 10thNight
10%6%25%44445%7%48%
1961
11th to 20thNight
9%5%26%445%45%6%50%
1875
21st to endNight
6%5%25%44446%7%54%
1900
May1st to 10thNight
6%426%5%5%6%5%6%10%44%
3080
11th to 20thNight
11%8%38%5%5%5%45%8%41%
2812
21st to endNight
6%5%26%445%5%7%10%47%
3079
June1st to 10thNight
9%7%39%5%5%5%48%11%35%
1710
11th to 20thNight
8%5%27%5%45%47%11%42%
1710
21st to endNight
8%427%6%6%6%5%9%14%34%
1710
July1st to 10thNight
7%5%28%6%7%7%6%8%13%31%
2840
11th to 20thNight
8%7%39%5%5%7%6%9%12%30%
2840
21st to endNight
8%6%37%6%6%7%6%10%12%28%
3087
August1st to 10thNight
20%9%37%445%5%8%11%24%
2825
11th to 20thNight
6%5%28%5%5%6%5%8%12%37%
3007
21st to endNight
6%326%45%6%47%10%46%
3476
September1st to 10thNight
9%5%16%5%5%5%5%7%11%40%
1900
11th to 20thNight
12%6%28%5%5%5%5%7%8%38%
1990
21st to endNight
15%8%36%5%44447%40%
2152
October1st to 10thNight
11%6%26%45%445%7%47%
2280
11th to 20thNight
9%41443435%6%56%
2280
21st to endNight
8%5%25%433346%56%
2508
November1st to 10thNight
10%6%16%43335%5%54%
2341
11th to 20thNight
11%7%36%5%44346%49%
2400
21st to endNight
10%6%2443436%7%50%
2406
December1st to 10thNight
16%7%36%5%4445%7%40%
2470
11th to 20thNight
16%6%25%333345%49%
3042
21st to endNight
15%7%36%43435%6%44%
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
21%39%5%12%18%5%
2837
11th to 20thDay
20%39%413%16%8%
2840
21st to endDay
25%42%5%11%11%6%
3124
February1st to 10thDay
16%66%47%7%1
1710
11th to 20thDay
17%64%27%7%2
1754
21st to endDay
16%65%45%5%4
1713
March1st to 10thDay
36%45%5%7%44
3435
11th to 20thDay
13%43%5%9%20%10%
3480
21st to endDay
24%41%314%12%5%
3815
April1st to 10thDay
14%66%47%8%2
2218
11th to 20thDay
13%66%5%8%5%4
2254
21st to endDay
9%65%6%11%8%1
2280
May1st to 10thDay
22%47%14%12%5%1
3864
11th to 20thDay
27%43%7%14%8%
4085
21st to endDay
13%44%14%16%11%1
4489
June1st to 10thDay
14%68%7%7%4
2470
11th to 20thDay
9%68%7%10%5%
2470
21st to endDay
13%67%10%8%1
2470
July1st to 10thDay
27%43%17%12%1
4055
11th to 20thDay
31%43%19%6%1
4051
21st to endDay
31%43%14%7%5%
4324
August1st to 10thDay
43%40%11%5%1
4091
11th to 20thDay
21%43%15%15%6%
3814
21st to endDay
17%40%14%26%3
4180
September1st to 10thDay
15%63%9%7%41
2280
11th to 20thDay
21%61%5%6%5%2
2185
21st to endDay
21%62%6%8%3
2028
October1st to 10thDay
25%39%6%14%13%3
3160
11th to 20thDay
9%37%39%20%22%
3140
21st to endDay
13%39%5%15%21%7%
3428
November1st to 10thDay
17%57%48%11%3
1957
11th to 20thDay
17%58%37%11%4
2000
21st to endDay
14%58%49%12%3
1864
December1st to 10thDay
21%61%47%5%2
1710
11th to 20thDay
14%48%210%20%5%
2150
21st to endDay
29%40%6%11%14%1
3124
January1st to 10thNight
24%40%412%13%6%
4109
11th to 20thNight
25%40%5%10%17%3
4120
21st to endNight
25%42%47%18%4
4532
February1st to 10thNight
14%65%48%7%2
2470
11th to 20thNight
16%65%36%7%2
2321
21st to endNight
17%65%347%4
1737
March1st to 10thNight
40%44%6%6%31
3418
11th to 20thNight
18%42%48%15%12%
3480
21st to endNight
22%42%415%12%4
3817
April1st to 10thNight
12%66%5%6%7%3
1961
11th to 20thNight
14%66%48%5%3
1875
21st to endNight
9%66%5%12%5%2
1900
May1st to 10thNight
20%46%12%14%6%1
3110
11th to 20thNight
24%44%8%15%8%
2813
21st to endNight
15%45%12%15%12%
3087
June1st to 10thNight
13%69%7%7%4
1710
11th to 20thNight
8%68%9%11%4
1710
21st to endNight
12%67%9%9%2
1710
July1st to 10thNight
26%44%17%13%
2795
11th to 20thNight
30%43%21%5%1
2786
21st to endNight
31%44%10%11%4
2988
August1st to 10thNight
39%40%15%5%1
2814
11th to 20thNight
19%43%16%16%5%
3035
21st to endNight
14%41%13%27%5%
3476
September1st to 10thNight
14%62%11%7%32
1900
11th to 20thNight
19%62%5%7%5%1
1990
21st to endNight
18%61%8%8%4
2152
October1st to 10thNight
23%39%6%13%16%3
3800
11th to 20thNight
7%37%38%15%30%
3779
21st to endNight
11%38%5%19%20%8%
4120
November1st to 10thNight
19%56%48%9%4
2341
11th to 20thNight
17%57%37%11%5%
2400
21st to endNight
12%59%5%11%11%3
2406
December1st to 10thNight
21%61%5%6%7%1
2470
11th to 20thNight
18%48%28%19%4
3044
21st to endNight
27%38%6%12%16%1
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
14%10%39%29%9%
270
11th to 20thDay
9%10%33%37%9%3
270
21st to endDay
19%11%31%30%7%1
297
February1st to 10thDay
17%10%31%31%10%
270
11th to 20thDay
22%8%35%28%7%
352
21st to endDay
12%13%36%29%9%2
382
March1st to 10thDay
14%8%31%33%13%1
460
11th to 20thDay
17%5%38%30%8%2
460
21st to endDay
13%5%37%32%11%2
506
April1st to 10thDay
13%10%29%29%16%2
460
11th to 20thDay
11%7%26%28%22%7%
452
21st to endDay
7%7%22%33%25%6%
460
May1st to 10thDay
5%7%28%34%19%7%
463
11th to 20thDay
13%313%34%29%8%
487
21st to endDay
12%410%27%32%15%
529
June1st to 10thDay
11%411%30%34%10%
490
11th to 20thDay
11%210%26%33%18%
490
21st to endDay
7%39%28%41%12%
490
July1st to 10thDay
8%2420%47%19%
485
11th to 20thDay
8%26%23%43%18%
484
21st to endDay
7%25%28%44%14%
532
August1st to 10thDay
15%27%24%37%15%
486
11th to 20thDay
9%16%23%37%23%
479
21st to endDay
11%37%21%38%21%
539
September1st to 10thDay
11%18%24%39%18%
490
11th to 20thDay
16%411%24%31%13%
490
21st to endDay
17%38%27%31%14%
490
October1st to 10thDay
15%317%27%27%12%
490
11th to 20thDay
10%119%32%28%10%
490
21st to endDay
10%419%29%30%6%
539
November1st to 10thDay
15%319%31%25%7%
495
11th to 20thDay
13%6%28%35%17%2
500
21st to endDay
10%7%28%31%20%5%
400
December1st to 10thDay
19%8%21%35%15%1
270
11th to 20thDay
17%7%26%29%17%4
270
21st to endDay
18%9%26%31%11%5%
297
January1st to 10thNight
16%11%33%32%8%
760
11th to 20thNight
14%10%29%36%10%
760
21st to endNight
17%8%37%33%5%
836
February1st to 10thNight
18%6%33%35%8%
760
11th to 20thNight
22%11%31%32%4
743
21st to endNight
18%8%30%33%9%
628
March1st to 10thNight
15%7%33%34%11%
760
11th to 20thNight
14%8%28%38%10%1
760
21st to endNight
14%5%32%34%14%1
836
April1st to 10thNight
12%7%31%35%14%1
760
11th to 20thNight
11%7%25%30%23%4
751
21st to endNight
8%5%25%37%23%3
760
May1st to 10thNight
7%5%23%38%23%3
736
11th to 20thNight
12%419%31%30%4
561
21st to endNight
11%18%28%37%16%
617
June1st to 10thNight
11%310%33%37%6%
570
11th to 20thNight
10%29%28%38%13%
570
21st to endNight
8%37%32%38%12%
570
July1st to 10thNight
9%36%24%47%12%
555
11th to 20thNight
10%15%24%46%14%
552
21st to endNight
8%3429%44%12%
624
August1st to 10thNight
13%26%24%42%14%
567
11th to 20thNight
10%25%28%43%13%
696
21st to endNight
12%15%22%44%16%
836
September1st to 10thNight
10%26%27%41%13%
760
11th to 20thNight
14%36%31%37%9%
760
21st to endNight
19%212%26%32%10%
760
October1st to 10thNight
14%317%30%28%9%
760
11th to 20thNight
10%322%34%25%6%
760
21st to endNight
11%6%18%31%27%6%
836
November1st to 10thNight
14%422%36%22%4
780
11th to 20thNight
14%7%29%32%17%2
800
21st to endNight
12%6%28%34%18%3
779
December1st to 10thNight
19%7%27%33%14%1
760
11th to 20thNight
17%7%29%31%16%1
760
21st to endNight
19%8%31%30%12%1
836
Page generated at 2024-11-22 08:02:27. Version ac07

Copyright © 2024 Attilla Danko.


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