Palm Coast
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Palm Coast 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
59%
15945
20%
46858
16%
15908
63%
15908
28%
30063

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
41%
716
19%
2327
13%
716
50%
716
21%
1497
January16th to endNight
43%
768
22%
2496
16%
768
54%
768
26%
1545
February1st to 15thNight
45%
701
23%
2116
16%
700
53%
700
30%
1281
February16th to endNight
48%
631
24%
1815
14%
631
57%
631
31%
1119
March1st to 15thNight
56%
720
29%
1980
20%
720
64%
720
40%
1143
March16th to endNight
58%
768
23%
2112
17%
768
63%
768
38%
1245
April1st to 15thNight
59%
718
22%
1976
16%
718
63%
718
37%
1178
April16th to endNight
67%
720
25%
1803
15%
720
70%
720
41%
1099
May1st to 15thNight
72%
581
25%
1661
20%
581
74%
581
40%
953
May16th to endNight
72%
561
21%
1682
17%
561
73%
561
32%
1036
June1st to 15thNight
70%
540
14%
1620
11%
540
70%
540
28%
1067
June16th to endNight
73%
540
9%
1620
8%
540
73%
540
22%
1126
July1st to 15thNight
71%
510
10%
1530
10%
510
71%
510
24%
1054
July16th to endNight
75%
564
10%
1595
9%
531
76%
531
24%
1079
August1st to 15thNight
75%
539
9%
1609
8%
536
75%
536
24%
1102
August16th to endNight
67%
732
11%
1976
11%
732
68%
732
22%
1434
September1st to 15thNight
63%
707
8%
1944
8%
707
63%
707
17%
1489
September16th to endNight
55%
657
11%
1815
11%
657
55%
657
15%
1422
October1st to 15thNight
63%
660
24%
1906
25%
660
64%
660
27%
1247
October16th to endNight
58%
704
25%
2112
24%
704
64%
704
30%
1268
November1st to 15thNight
57%
700
24%
2101
20%
700
62%
700
29%
1303
November16th to endNight
49%
720
24%
2226
18%
720
57%
720
28%
1364
December1st to 15thNight
49%
720
25%
2340
22%
720
56%
720
26%
1461
December16th to endNight
54%
768
22%
2496
20%
768
60%
768
25%
1551

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
9%5%25%5%36%6%6%9%38%
47786
Night
9%5%25%5%35%5%6%9%42%
47063
TransparencyDay
38%9%16%18%12%4
47487
Night
37%8%15%19%13%5%
46866
SeeingDay
10%211%23%31%21%
5788
Night
11%315%28%31%10%
15955

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
12%7%35%5%35%45%7%38%
1611
16th to endDay
12%6%35%5%2446%6%43%
1728
February1st to 15thDay
12%6%26%43445%5%44%
1738
16th to endDay
9%5%35%325%45%6%46%
1656
March1st to 15thDay
7%4244235%49%52%
1980
16th to endDay
8%424424347%51%
2111
April1st to 15thDay
6%315%5%26%5%6%8%48%
1972
16th to endDay
6%3133245%6%9%50%
2156
May1st to 15thDay
6%324435%5%6%8%49%
2297
16th to endDay
7%3245%37%6%8%10%40%
2431
June1st to 15thDay
9%5%26%6%37%7%8%10%32%
2340
16th to endDay
8%326%6%48%7%9%11%30%
2340
July1st to 15thDay
7%6%26%5%47%7%8%12%30%
2340
16th to endDay
7%5%37%7%5%8%7%7%11%29%
2465
August1st to 15thDay
5%427%8%5%8%8%9%13%26%
2340
16th to endDay
10%6%37%7%46%7%7%12%26%
2210
September1st to 15thDay
8%6%37%8%48%7%8%10%26%
1936
16th to endDay
14%7%48%9%46%6%7%8%21%
1815
October1st to 15thDay
10%6%26%5%35%6%6%9%36%
1724
16th to endDay
10%325%435%5%5%8%43%
1760
November1st to 15thDay
7%5%35%5%25%6%5%7%44%
1757
16th to endDay
9%5%36%6%36%5%47%40%
1731
December1st to 15thDay
12%6%35%435%46%8%39%
1620
16th to endDay
8%426%6%26%5%7%9%40%
1728
January1st to 15thNight
13%7%35%435%5%5%7%39%
2327
16th to endNight
14%5%25%42445%7%44%
2496
February1st to 15thNight
11%5%245%2435%5%50%
2112
16th to endNight
8%5%15%425%45%8%47%
1815
March1st to 15thNight
7%41242445%9%53%
1980
16th to endNight
7%4145%24445%55%
2112
April1st to 15thNight
7%42342445%8%52%
1976
16th to endNight
7%31432346%10%51%
1803
May1st to 15thNight
5%213325%46%10%54%
1661
16th to endNight
6%325%5%35%6%7%10%43%
1682
June1st to 15thNight
9%4245%36%6%7%12%37%
1620
16th to endNight
6%435%7%46%7%10%12%32%
1620
July1st to 15thNight
6%5%16%7%35%6%8%11%36%
1620
16th to endNight
5%435%5%46%7%7%10%37%
1703
August1st to 15thNight
4425%7%5%5%6%9%11%35%
1620
16th to endNight
8%6%36%6%35%6%7%13%30%
1976
September1st to 15thNight
9%6%47%7%47%7%8%10%27%
1944
16th to endNight
13%8%37%7%47%7%8%9%22%
1815
October1st to 15thNight
9%5%25%5%35%5%6%8%41%
1906
16th to endNight
9%6%3442445%7%46%
2112
November1st to 15thNight
7%5%246%45%45%9%43%
2101
16th to endNight
9%5%246%35%5%5%8%43%
2226
December1st to 15thNight
12%5%35%5%2445%8%42%
2340
16th to endNight
9%6%25%435%46%8%41%
2496

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%6%10%16%16%7%
1612
16th to endDay
40%49%17%19%8%
1728
February1st to 15thDay
41%5%7%13%20%12%
1740
16th to endDay
36%6%12%16%18%9%
1656
March1st to 15thDay
29%5%13%25%19%6%
1980
16th to endDay
32%5%13%21%19%6%
2112
April1st to 15thDay
31%7%12%20%21%6%
1972
16th to endDay
27%6%13%26%20%6%
2156
May1st to 15thDay
30%6%13%23%19%6%
2297
16th to endDay
33%10%19%20%14%2
2435
June1st to 15thDay
41%13%18%21%5%
2340
16th to endDay
42%12%23%16%4
2340
July1st to 15thDay
40%14%26%16%1
2201
16th to endDay
42%14%24%16%2
2310
August1st to 15thDay
41%18%25%12%1
2327
16th to endDay
44%16%22%14%1
2210
September1st to 15thDay
47%15%20%11%4
1936
16th to endDay
53%11%15%12%42
1815
October1st to 15thDay
41%8%11%16%15%7%
1724
16th to endDay
36%5%9%16%22%9%
1760
November1st to 15thDay
35%6%12%18%20%6%
1757
16th to endDay
40%6%10%16%18%8%
1731
December1st to 15thDay
41%6%11%21%14%4
1620
16th to endDay
36%6%14%22%11%7%
1728
January1st to 15thNight
43%5%9%19%15%6%
2327
16th to endNight
39%49%16%20%8%
2496
February1st to 15thNight
35%5%9%16%18%14%
2121
16th to endNight
34%6%13%17%19%8%
1815
March1st to 15thNight
27%6%13%27%17%8%
1980
16th to endNight
30%413%21%19%9%
2112
April1st to 15thNight
30%6%12%22%19%8%
1976
16th to endNight
28%6%14%24%19%6%
1803
May1st to 15thNight
26%7%15%24%20%6%
1662
16th to endNight
32%9%16%25%15%1
1684
June1st to 15thNight
36%10%23%24%4
1620
16th to endNight
39%14%21%17%6%
1620
July1st to 15thNight
38%13%27%17%2
1530
16th to endNight
36%14%27%18%2
1595
August1st to 15thNight
35%15%31%15%1
1609
16th to endNight
43%13%24%17%1
1976
September1st to 15thNight
48%14%17%13%6%
1944
16th to endNight
53%13%13%13%5%1
1815
October1st to 15thNight
37%9%9%17%17%8%
1906
16th to endNight
36%411%16%20%10%
2112
November1st to 15thNight
36%6%11%19%19%7%
2101
16th to endNight
36%6%13%16%16%10%
2226
December1st to 15thNight
39%5%11%23%13%5%
2340
16th to endNight
39%6%13%21%11%7%
2496

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
14%6%26%34%13%4
90
16th to endDay
14%6%34%30%13%1
96
February1st to 15thDay
11%10%25%30%17%5%
90
16th to endDay
15%333%35%10%
157
March1st to 15thDay
11%5%24%35%20%3
270
16th to endDay
11%321%31%28%4
288
April1st to 15thDay
8%422%35%22%6%
270
16th to endDay
4214%31%33%13%
270
May1st to 15thDay
7%212%32%30%13%
288
16th to endDay
6%5%20%39%27%
331
June1st to 15thDay
8%17%18%34%29%
315
16th to endDay
7%213%39%36%
315
July1st to 15thDay
6%2435%50%
305
16th to endDay
7%37%43%37%
326
August1st to 15thDay
6%314%38%36%
313
16th to endDay
9%39%32%43%
332
September1st to 15thDay
14%6%9%37%32%
299
16th to endDay
18%5%11%37%27%
254
October1st to 15thDay
16%18%29%34%10%
255
16th to endDay
11%211%32%33%8%
272
November1st to 15thDay
8%313%36%27%10%
265
16th to endDay
12%417%33%26%4
201
December1st to 15thDay
7%226%45%15%2
90
16th to endDay
7%110%41%32%7%
96
January1st to 15thNight
15%8%26%29%16%3
720
16th to endNight
14%7%27%34%13%
768
February1st to 15thNight
13%6%28%35%14%1
704
16th to endNight
12%5%27%40%12%
631
March1st to 15thNight
7%5%25%41%18%1
720
16th to endNight
9%320%37%24%4
768
April1st to 15thNight
9%222%35%26%3
718
16th to endNight
7%217%37%30%3
720
May1st to 15thNight
6%212%39%34%4
582
16th to endNight
8%8%25%44%13%
563
June1st to 15thNight
11%5%21%41%18%
540
16th to endNight
7%314%48%26%
540
July1st to 15thNight
8%313%40%33%
510
16th to endNight
6%312%53%24%
564
August1st to 15thNight
7%312%51%26%
539
16th to endNight
11%312%45%27%
732
September1st to 15thNight
13%414%44%21%
707
16th to endNight
17%6%17%40%17%
657
October1st to 15thNight
14%29%29%36%8%
660
16th to endNight
12%412%30%33%5%
704
November1st to 15thNight
10%318%34%28%4
700
16th to endNight
10%5%24%33%20%4
720
December1st to 15thNight
15%5%21%28%23%5%
720
16th to endNight
13%6%18%31%26%3
768
Page generated at 2017-09-13 07:39:16. Version ac04

Copyright 2017 A. Danko


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