Indiantown
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Indiantown clear sky chart from 2005-11-05 to 2017-12-04.

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
64%
16497
20%
47844
16%
16460
68%
16460
31%
29880

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
54%
716
19%
2327
15%
716
61%
716
28%
1390
January16th to endNight
52%
768
25%
2487
21%
768
60%
768
32%
1407
February1st to 15thNight
51%
701
26%
2107
21%
700
58%
700
34%
1231
February16th to endNight
55%
631
29%
1744
18%
631
65%
631
39%
996
March1st to 15thNight
59%
720
28%
1980
19%
720
67%
720
44%
1093
March16th to endNight
63%
768
27%
2112
21%
768
69%
768
44%
1168
April1st to 15thNight
67%
718
24%
1975
20%
718
71%
718
47%
1066
April16th to endNight
64%
720
27%
1800
17%
720
67%
720
45%
1064
May1st to 15thNight
71%
719
25%
1799
16%
719
74%
719
48%
1036
May16th to endNight
76%
564
19%
1685
17%
564
77%
564
34%
1044
June1st to 15thNight
66%
540
10%
1620
8%
540
66%
540
21%
1167
June16th to endNight
76%
540
11%
1620
9%
540
76%
540
26%
1103
July1st to 15thNight
71%
510
5%
1530
4%
510
71%
510
21%
1094
July16th to endNight
79%
564
8%
1595
8%
531
80%
531
27%
1055
August1st to 15thNight
77%
585
8%
1655
8%
582
77%
582
29%
1096
August16th to endNight
66%
764
6%
2006
5%
764
66%
764
20%
1499
September1st to 15thNight
67%
720
5%
1980
5%
720
67%
720
20%
1449
September16th to endNight
63%
717
7%
1980
8%
717
63%
717
18%
1490
October1st to 15thNight
69%
720
21%
2094
22%
720
70%
720
28%
1337
October16th to endNight
61%
768
22%
2304
22%
768
65%
768
29%
1464
November1st to 15thNight
65%
760
25%
2281
24%
760
70%
760
35%
1351
November16th to endNight
56%
780
28%
2340
25%
780
62%
780
31%
1450
December1st to 15thNight
62%
736
24%
2327
24%
736
67%
736
30%
1407
December16th to endNight
64%
768
23%
2496
24%
768
67%
768
32%
1423

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
8%5%37%8%47%7%7%9%31%
48633
Night
6%4245%35%6%7%10%42%
48049
TransparencyDay
46%7%14%17%10%3
48334
Night
34%7%18%22%13%3
47852
SeeingDay
8%212%21%25%28%
6319
Night
8%213%30%32%11%
16507

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
9%6%35%7%5%6%6%6%8%35%
1611
16th to endDay
9%5%246%45%6%6%8%40%
1734
February1st to 15thDay
10%5%35%6%245%5%8%41%
1750
16th to endDay
6%425%6%346%6%9%44%
1727
March1st to 15thDay
5%326%7%35%6%8%10%40%
1980
16th to endDay
6%426%6%36%5%6%10%40%
2111
April1st to 15thDay
5%425%7%47%6%8%9%38%
1972
16th to endDay
5%426%7%46%7%6%9%37%
2160
May1st to 15thDay
43146%36%6%7%8%45%
2157
16th to endDay
7%5%48%8%5%8%7%7%8%26%
2431
June1st to 15thDay
11%7%48%9%5%8%7%7%9%19%
2340
16th to endDay
9%5%38%10%6%9%8%8%10%20%
2340
July1st to 15thDay
8%7%49%8%6%10%10%8%9%17%
2340
16th to endDay
7%5%48%9%6%10%8%8%9%20%
2465
August1st to 15thDay
7%5%38%9%5%9%8%9%10%23%
2280
16th to endDay
9%6%310%10%6%9%7%9%9%17%
2193
September1st to 15thDay
8%6%38%10%6%9%8%8%9%19%
1980
16th to endDay
10%8%410%10%5%8%7%7%8%17%
1980
October1st to 15thDay
6%5%37%8%5%7%7%7%9%30%
1865
16th to endDay
13%5%36%7%46%6%6%8%30%
1920
November1st to 15thDay
7%5%36%6%46%5%5%8%40%
1907
16th to endDay
10%5%36%6%36%6%5%8%37%
1950
December1st to 15thDay
11%5%36%6%45%5%6%8%35%
1712
16th to endDay
6%5%36%6%36%5%7%9%38%
1728
January1st to 15thNight
7%6%345%35%45%9%42%
2327
16th to endNight
7%4245%3446%9%47%
2487
February1st to 15thNight
10%423425%448%49%
2103
16th to endNight
5%224435%5%6%8%51%
1744
March1st to 15thNight
3213425%6%6%8%55%
1980
16th to endNight
3213325%6%5%9%55%
2112
April1st to 15thNight
321342446%10%56%
1975
16th to endNight
5%31342446%10%52%
1800
May1st to 15thNight
431322447%11%53%
1799
16th to endNight
6%434435%6%9%11%41%
1685
June1st to 15thNight
9%7%47%6%46%6%9%13%25%
1620
16th to endNight
45%36%6%37%7%8%11%35%
1620
July1st to 15thNight
7%446%7%45%7%6%11%33%
1620
16th to endNight
5%425%6%36%8%9%12%35%
1703
August1st to 15thNight
6%425%5%36%6%9%13%37%
1666
16th to endNight
8%5%37%6%46%7%8%12%28%
2006
September1st to 15thNight
7%6%35%7%38%8%9%13%27%
1980
16th to endNight
8%6%38%8%5%7%8%8%10%25%
1980
October1st to 15thNight
6%425%5%36%7%8%9%39%
2094
16th to endNight
11%6%24435%5%6%10%40%
2304
November1st to 15thNight
5%3245%46%5%6%10%46%
2281
16th to endNight
8%5%35%5%345%5%8%45%
2340
December1st to 15thNight
7%425%445%5%6%8%44%
2327
16th to endNight
6%4245%25%5%7%8%47%
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
45%5%11%17%15%4
1612
16th to endDay
39%5%9%21%16%7%
1734
February1st to 15thDay
39%46%22%17%8%
1752
16th to endDay
36%412%21%17%7%
1727
March1st to 15thDay
36%411%25%18%4
1980
16th to endDay
38%411%22%16%6%
2112
April1st to 15thDay
37%5%13%21%17%3
1972
16th to endDay
40%6%9%19%20%4
2160
May1st to 15thDay
32%6%12%25%16%6%
2157
16th to endDay
50%6%14%18%9%
2435
June1st to 15thDay
57%8%16%13%4
2340
16th to endDay
52%11%20%12%2
2340
July1st to 15thDay
54%15%19%8%1
2201
16th to endDay
52%12%23%11%
2310
August1st to 15thDay
49%11%27%10%
2267
16th to endDay
55%11%22%9%
2193
September1st to 15thDay
55%13%20%10%1
1980
16th to endDay
60%9%15%10%3
1980
October1st to 15thDay
46%6%13%18%12%2
1865
16th to endDay
48%6%7%15%15%6%
1920
November1st to 15thDay
42%48%20%17%6%
1907
16th to endDay
44%5%8%16%17%8%
1950
December1st to 15thDay
45%411%19%13%4
1712
16th to endDay
40%411%21%17%5%
1728
January1st to 15thNight
36%415%24%13%4
2327
16th to endNight
33%312%26%16%6%
2487
February1st to 15thNight
33%48%23%21%8%
2112
16th to endNight
28%5%14%26%20%5%
1744
March1st to 15thNight
25%414%32%17%5%
1980
16th to endNight
25%5%14%28%20%6%
2112
April1st to 15thNight
22%5%19%29%18%4
1975
16th to endNight
26%5%15%26%22%4
1800
May1st to 15thNight
24%414%34%15%5%
1800
16th to endNight
33%7%20%27%11%
1687
June1st to 15thNight
46%10%22%15%5%
1620
16th to endNight
37%12%29%18%2
1620
July1st to 15thNight
41%14%31%11%1
1530
16th to endNight
34%13%34%16%1
1595
August1st to 15thNight
34%12%36%16%
1655
16th to endNight
43%15%27%12%
2006
September1st to 15thNight
42%15%28%11%2
1980
16th to endNight
48%13%22%12%2
1980
October1st to 15thNight
36%8%16%19%16%1
2094
16th to endNight
39%5%11%18%18%6%
2304
November1st to 15thNight
33%412%22%20%6%
2281
16th to endNight
37%48%22%18%8%
2340
December1st to 15thNight
36%5%13%24%16%4
2327
16th to endNight
32%5%15%23%17%5%
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
16%7%35%23%13%3
90
16th to endDay
18%12%30%21%14%2
96
February1st to 15thDay
410%26%38%15%4
90
16th to endDay
9%326%34%24%2
228
March1st to 15thDay
6%333%28%23%3
270
16th to endDay
5%5%22%31%27%7%
288
April1st to 15thDay
5%5%22%26%26%12%
270
16th to endDay
6%217%24%30%18%
270
May1st to 15thDay
5%113%20%36%21%
288
16th to endDay
6%16%21%31%32%
331
June1st to 15thDay
12%35%17%23%37%
315
16th to endDay
5%137%24%58%
315
July1st to 15thDay
5%15%25%61%
305
16th to endDay
9%48%20%56%
326
August1st to 15thDay
6%16%25%58%
313
16th to endDay
10%1312%19%52%
332
September1st to 15thDay
6%1411%21%53%
315
16th to endDay
14%311%28%41%
314
October1st to 15thDay
9%17%28%37%16%
315
16th to endDay
15%316%29%23%11%
336
November1st to 15thDay
9%110%36%28%12%
325
16th to endDay
6%419%38%28%2
330
December1st to 15thDay
16%414%35%22%6%
161
16th to endDay
35%13%45%23%8%
96
January1st to 15thNight
10%6%20%35%25%1
720
16th to endNight
8%6%26%39%17%1
768
February1st to 15thNight
11%5%25%40%16%1
704
16th to endNight
9%325%43%17%
631
March1st to 15thNight
6%426%42%18%2
720
16th to endNight
5%321%42%25%1
768
April1st to 15thNight
4318%44%26%1
718
16th to endNight
6%319%46%23%1
720
May1st to 15thNight
4213%46%29%3
720
16th to endNight
6%2433%41%12%
566
June1st to 15thNight
13%2219%45%17%
540
16th to endNight
41210%47%32%
540
July1st to 15thNight
9%16%48%33%
510
16th to endNight
6%16%47%38%
564
August1st to 15thNight
5%17%49%34%
585
16th to endNight
10%2211%41%30%
764
September1st to 15thNight
10%129%45%30%
720
16th to endNight
12%1214%43%24%
717
October1st to 15thNight
8%16%31%41%10%
720
16th to endNight
14%212%29%31%9%
768
November1st to 15thNight
7%117%36%33%4
760
16th to endNight
10%319%38%26%2
780
December1st to 15thNight
10%214%37%31%2
736
16th to endNight
7%317%37%30%3
768
Page generated at 2017-12-05 10:19:02. Version ac04

Copyright 2017 A. Danko


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