Naples
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Naples clear sky chart from 2005-11-06 to 2024-03-23.

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
66%
24938
18%
80195
17%
24840
69%
24840
28%
50155

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
58%
751
19%
4043
20%
737
66%
737
19%
2342
January11th to 20thNight
54%
757
13%
4110
19%
740
61%
740
14%
2954
January21st to endNight
49%
829
18%
4150
18%
814
57%
814
19%
2343
February1st to 10thNight
53%
760
24%
2280
19%
760
58%
760
32%
1372
February11th to 20thNight
61%
741
27%
2218
21%
739
67%
739
40%
1215
February21st to endNight
69%
628
33%
1747
27%
628
73%
628
50%
913
March1st to 10thNight
63%
760
31%
2090
21%
760
71%
760
49%
1115
March11th to 20thNight
63%
760
28%
2090
19%
760
70%
760
43%
1175
March21st to endNight
66%
801
31%
2201
24%
801
71%
801
46%
1220
April1st to 10thNight
68%
720
25%
1980
19%
720
72%
720
46%
1072
April11th to 20thNight
65%
711
20%
1953
15%
711
70%
711
41%
1131
April21st to endNight
67%
720
28%
1826
19%
720
71%
720
46%
1066
May1st to 10thNight
79%
694
29%
1774
21%
694
81%
694
55%
940
May11th to 20thNight
71%
531
13%
1592
11%
531
73%
531
33%
981
May21st to endNight
77%
582
20%
1745
17%
582
77%
582
32%
1085
June1st to 10thNight
65%
540
11%
1620
10%
540
65%
540
19%
1190
June11th to 20thNight
73%
540
9%
1620
8%
540
73%
540
23%
1114
June21st to endNight
75%
540
7%
1620
7%
540
75%
540
21%
1199
July1st to 10thNight
75%
525
6%
1575
6%
525
75%
525
19%
1159
July11th to 20thNight
77%
522
4%
1566
5%
522
77%
522
22%
1145
July21st to endNight
82%
591
8%
1672
8%
558
83%
558
23%
1177
August1st to 10thNight
76%
537
4%
1607
4%
534
76%
534
21%
1176
August11th to 20thNight
76%
605
5%
1847
5%
605
76%
605
21%
1310
August21st to endNight
64%
792
4%
2178
4%
792
64%
792
16%
1664
September1st to 10thNight
75%
720
6%
1980
6%
720
75%
720
22%
1435
September11th to 20thNight
69%
720
7%
1980
8%
720
69%
720
19%
1472
September21st to endNight
62%
720
9%
1980
9%
720
62%
720
17%
1521
October1st to 10thNight
67%
720
17%
1980
16%
720
68%
720
26%
1343
October11th to 20thNight
67%
720
23%
2142
23%
720
70%
720
31%
1335
October21st to endNight
65%
792
24%
2376
24%
792
68%
792
30%
1464
November1st to 10thNight
61%
740
25%
2221
22%
740
66%
740
36%
1275
November11th to 20thNight
62%
760
26%
2280
25%
760
66%
760
34%
1357
November21st to endNight
61%
760
26%
2280
24%
760
65%
760
33%
1362
December1st to 10thNight
66%
760
24%
2465
23%
760
71%
760
35%
1351
December11th to 20thNight
61%
760
25%
2930
24%
758
65%
758
29%
1573
December21st to endNight
61%
829
14%
4477
24%
817
66%
817
19%
2609

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
7%5%25%6%46%7%8%10%41%
79155
Night
7%5%26%6%45%6%7%10%42%
80734
TransparencyDay
34%12%19%19%12%3
78878
Night
34%11%18%20%14%4
80530
SeeingDay
6%313%27%32%19%
14797
Night
7%314%32%31%13%
24968

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
10%8%35%5%3446%10%42%
2836
11th to 20thDay
16%7%37%6%35%6%6%8%32%
2840
21st to endDay
7%6%37%5%45%6%7%7%43%
3414
February1st to 10thDay
8%5%35%5%345%6%9%48%
1900
11th to 20thDay
6%31333345%9%61%
1848
21st to endDay
5%3233246%5%8%58%
1704
March1st to 10thDay
32144345%6%10%59%
2090
11th to 20thDay
432442446%11%56%
2090
21st to endDay
43235%335%5%9%58%
2200
April1st to 10thDay
32133245%8%10%58%
1980
11th to 20thDay
5%4244345%5%9%55%
1956
21st to endDay
441443446%9%57%
2132
May1st to 10thDay
31123235%6%9%65%
2199
11th to 20thDay
6%5%346%46%5%7%10%45%
2301
21st to endDay
8%425%6%36%7%7%10%40%
2531
June1st to 10thDay
11%7%46%6%48%8%8%10%28%
2340
11th to 20thDay
6%436%7%6%7%8%9%14%29%
2340
21st to endDay
6%6%26%7%5%8%9%11%12%27%
2340
July1st to 10thDay
6%5%36%8%5%9%10%10%13%25%
2340
11th to 20thDay
5%5%27%8%7%9%10%12%11%23%
2340
21st to endDay
6%437%8%6%8%11%12%13%23%
2547
August1st to 10thDay
4436%8%5%8%11%10%13%28%
2315
11th to 20thDay
4426%9%6%11%9%11%12%24%
2033
21st to endDay
7%6%38%8%7%9%9%9%11%23%
2178
September1st to 10thDay
5%5%37%9%6%7%9%9%12%29%
1980
11th to 20thDay
6%6%37%8%5%9%9%9%11%26%
1980
21st to endDay
9%8%37%8%5%8%8%8%11%25%
1980
October1st to 10thDay
7%436%6%47%9%9%11%34%
1980
11th to 20thDay
7%5%26%6%47%6%8%11%39%
1817
21st to endDay
7%435%5%36%6%6%8%46%
1980
November1st to 10thDay
5%4345%35%6%5%10%51%
1857
11th to 20thDay
8%5%245%46%7%7%9%44%
1900
21st to endDay
5%425%5%35%6%8%9%49%
1900
December1st to 10thDay
8%4245%245%6%9%51%
1710
11th to 20thDay
7%435%435%5%6%10%47%
2153
21st to endDay
9%5%36%6%46%6%8%10%38%
3124
January1st to 10thNight
7%6%26%7%45%6%7%11%38%
4109
11th to 20thNight
15%9%48%6%45%5%6%8%29%
4120
21st to endNight
6%6%37%6%46%5%8%9%40%
4238
February1st to 10thNight
7%6%35%5%445%6%8%47%
2280
11th to 20thNight
6%42443345%8%56%
2218
21st to endNight
331432445%9%61%
1747
March1st to 10thNight
332442445%8%60%
2090
11th to 20thNight
6%413445%46%8%56%
2090
21st to endNight
33145%35%5%5%8%59%
2201
April1st to 10thNight
5%3143245%6%10%57%
1980
11th to 20thNight
5%325%5%346%6%11%51%
1953
21st to endNight
44245%345%6%9%55%
1826
May1st to 10thNight
3212325%46%9%62%
1774
11th to 20thNight
7%325%5%36%6%9%9%45%
1592
21st to endNight
6%4345%45%6%8%12%43%
1744
June1st to 10thNight
12%7%37%7%46%7%7%12%28%
1620
11th to 20thNight
7%6%36%6%47%6%8%13%35%
1620
21st to endNight
45%27%9%6%7%8%8%13%30%
1620
July1st to 10thNight
45%27%9%5%7%7%8%13%32%
1620
11th to 20thNight
45%36%7%5%8%9%11%13%29%
1620
21st to endNight
44246%5%8%10%11%15%32%
1771
August1st to 10thNight
5%5%36%8%5%8%8%10%14%30%
1618
11th to 20thNight
5%426%7%48%7%10%14%32%
1847
21st to endNight
8%7%48%8%5%7%8%9%12%26%
2178
September1st to 10thNight
5%426%7%5%7%9%10%16%29%
1980
11th to 20thNight
6%6%37%7%47%7%9%13%30%
1980
21st to endNight
9%7%38%7%5%7%7%8%11%27%
1980
October1st to 10thNight
7%6%26%6%46%7%6%11%38%
1980
11th to 20thNight
7%6%25%5%45%5%5%9%45%
2142
21st to endNight
8%5%26%6%36%6%6%9%43%
2376
November1st to 10thNight
7%4245%25%5%7%7%52%
2221
11th to 20thNight
7%6%35%5%346%5%9%48%
2280
21st to endNight
7%425%6%45%6%6%10%46%
2280
December1st to 10thNight
6%424435%5%6%9%52%
2465
11th to 20thNight
9%6%244245%6%8%50%
3042
21st to endNight
10%7%36%6%45%6%7%10%37%
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
38%7%12%23%16%4
2837
11th to 20thDay
46%9%12%18%11%3
2840
21st to endDay
36%7%11%23%18%5%
3414
February1st to 10thDay
31%6%14%24%20%6%
1900
11th to 20thDay
20%5%13%28%23%10%
1858
21st to endDay
23%6%14%21%29%7%
1704
March1st to 10thDay
19%7%14%28%26%6%
2090
11th to 20thDay
22%6%18%30%19%6%
2090
21st to endDay
21%6%16%29%22%7%
2200
April1st to 10thDay
19%8%22%31%16%5%
1980
11th to 20thDay
25%8%19%28%17%4
1956
21st to endDay
23%6%16%27%24%4
2132
May1st to 10thDay
14%6%19%32%24%6%
2199
11th to 20thDay
33%10%21%22%13%1
2305
21st to endDay
34%11%18%24%13%1
2531
June1st to 10thDay
45%14%23%16%2
2340
11th to 20thDay
39%17%28%14%2
2340
21st to endDay
41%19%27%11%1
2340
July1st to 10thDay
43%22%26%8%
2275
11th to 20thDay
44%21%26%9%
2271
21st to endDay
42%22%24%11%1
2405
August1st to 10thDay
39%20%31%10%1
2302
11th to 20thDay
41%21%29%9%
2033
21st to endDay
48%20%23%8%1
2178
September1st to 10thDay
42%20%26%11%
1980
11th to 20thDay
43%19%21%13%3
1980
21st to endDay
48%15%20%11%5%1
1980
October1st to 10thDay
37%14%19%15%11%4
1980
11th to 20thDay
35%11%16%20%14%4
1817
21st to endDay
32%7%15%19%19%8%
1980
November1st to 10thDay
28%8%16%19%18%11%
1857
11th to 20thDay
33%8%13%23%16%8%
1900
21st to endDay
27%8%16%23%21%5%
1900
December1st to 10thDay
29%6%15%27%19%3
1710
11th to 20thDay
29%7%15%22%17%9%
2150
21st to endDay
38%9%16%19%15%3
3124
January1st to 10thNight
36%9%13%21%17%3
4109
11th to 20thNight
52%9%11%16%9%3
4120
21st to endNight
37%7%11%21%20%4
4238
February1st to 10thNight
33%7%13%22%19%6%
2280
11th to 20thNight
26%6%12%24%21%10%
2219
21st to endNight
20%5%13%23%30%8%
1747
March1st to 10thNight
21%6%13%32%24%6%
2090
11th to 20thNight
26%5%15%29%20%4
2090
21st to endNight
22%7%13%28%24%6%
2201
April1st to 10thNight
21%7%19%33%16%4
1980
11th to 20thNight
26%8%18%25%19%5%
1953
21st to endNight
23%8%15%26%23%4
1826
May1st to 10thNight
17%6%17%31%24%5%
1774
11th to 20thNight
30%11%23%21%14%
1593
21st to endNight
31%11%19%23%16%1
1745
June1st to 10thNight
46%13%20%18%3
1620
11th to 20thNight
38%15%29%16%2
1620
21st to endNight
42%17%28%11%3
1620
July1st to 10thNight
40%19%30%10%1
1575
11th to 20thNight
39%17%33%10%1
1566
21st to endNight
32%22%31%15%
1672
August1st to 10thNight
38%19%29%13%
1607
11th to 20thNight
36%19%33%10%1
1847
21st to endNight
45%18%28%7%1
2178
September1st to 10thNight
36%21%32%11%1
1980
11th to 20thNight
41%19%25%13%2
1980
21st to endNight
46%17%19%12%5%1
1980
October1st to 10thNight
36%13%20%18%10%3
1980
11th to 20thNight
34%8%15%23%17%3
2142
21st to endNight
34%9%13%19%19%7%
2376
November1st to 10thNight
28%8%14%20%21%8%
2221
11th to 20thNight
32%8%13%23%19%7%
2280
21st to endNight
31%8%14%20%22%4
2280
December1st to 10thNight
28%7%17%28%17%4
2465
11th to 20thNight
30%7%12%24%19%9%
3044
21st to endNight
37%9%21%17%14%3
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
7%5%31%36%18%3
270
11th to 20thDay
10%10%26%30%21%3
270
21st to endDay
11%7%31%40%9%1
297
February1st to 10thDay
49%22%41%23%3
270
11th to 20thDay
6%422%41%22%5%
270
21st to endDay
3423%39%28%3
359
March1st to 10thDay
3425%48%19%1
460
11th to 20thDay
4423%38%27%2
460
21st to endDay
3221%43%28%3
470
April1st to 10thDay
3424%44%21%4
420
11th to 20thDay
6%423%36%28%3
412
21st to endDay
5%315%39%35%3
420
May1st to 10thDay
212%42%36%7%
423
11th to 20thDay
7%311%32%35%12%
447
21st to endDay
8%16%23%39%23%
485
June1st to 10thDay
14%18%18%39%20%
450
11th to 20thDay
6%16%16%37%33%
450
21st to endDay
31211%34%48%
450
July1st to 10thDay
5%116%36%52%
445
11th to 20thDay
5%27%35%51%
444
21st to endDay
7%1213%35%42%
488
August1st to 10thDay
4129%38%46%
446
11th to 20thDay
5%128%40%45%
439
21st to endDay
9%1416%35%36%
495
September1st to 10thDay
5%2411%34%44%
450
11th to 20thDay
6%1415%37%37%
450
21st to endDay
8%2414%38%35%
450
October1st to 10thDay
7%110%29%39%13%
450
11th to 20thDay
7%312%25%38%15%
450
21st to endDay
9%411%32%34%10%
495
November1st to 10thDay
7%416%29%35%9%
455
11th to 20thDay
10%319%32%28%7%
460
21st to endDay
3220%38%33%4
460
December1st to 10thDay
9%416%35%29%7%
270
11th to 20thDay
7%421%34%27%6%
270
21st to endDay
5%5%21%33%31%6%
297
January1st to 10thNight
8%6%21%40%24%2
760
11th to 20thNight
9%6%24%38%22%1
760
21st to endNight
8%6%29%41%16%
836
February1st to 10thNight
8%5%26%42%19%1
760
11th to 20thNight
7%6%22%41%23%2
743
21st to endNight
5%317%48%27%1
628
March1st to 10thNight
45%22%46%22%1
760
11th to 20thNight
8%221%42%26%1
760
21st to endNight
3321%47%24%1
801
April1st to 10thNight
5%318%44%28%1
720
11th to 20thNight
5%419%47%24%2
711
21st to endNight
6%118%44%29%2
720
May1st to 10thNight
4111%44%35%4
694
11th to 20thNight
8%111%37%38%5%
531
21st to endNight
6%17%28%48%10%
584
June1st to 10thNight
13%25%18%47%14%
540
11th to 20thNight
6%2316%41%32%
540
21st to endNight
41211%40%41%
540
July1st to 10thNight
4226%39%47%
525
11th to 20thNight
4129%38%46%
522
21st to endNight
428%38%48%
591
August1st to 10thNight
5%110%45%38%
537
11th to 20thNight
7%128%36%47%
605
21st to endNight
10%26%16%37%30%
792
September1st to 10thNight
6%1312%43%34%
720
11th to 20thNight
8%2317%40%30%
720
21st to endNight
12%15%21%37%23%
720
October1st to 10thNight
10%19%35%35%10%
720
11th to 20thNight
8%211%33%36%11%
720
21st to endNight
10%216%36%29%7%
792
November1st to 10thNight
8%421%36%29%3
740
11th to 20thNight
8%319%39%27%3
760
21st to endNight
8%419%39%29%1
760
December1st to 10thNight
8%317%40%29%3
760
11th to 20thNight
9%419%36%28%3
760
21st to endNight
8%418%39%29%2
836
Page generated at 2024-03-19 23:31:09. Version ac07

Copyright © 2024 Attilla Danko.


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