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 2017-04-25.

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
64%
15699
20%
45558
16%
15662
67%
15662
31%
28441

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
63%
700
25%
1750
16%
700
67%
700
44%
1041
May1st to 15thNight
71%
659
26%
1649
16%
659
73%
659
47%
961
May16th to endNight
76%
516
18%
1541
16%
516
76%
516
32%
967
June1st to 15thNight
69%
495
10%
1485
8%
495
69%
495
23%
1042
June16th to endNight
77%
495
10%
1485
9%
495
77%
495
26%
1006
July1st to 15thNight
69%
465
5%
1395
4%
465
69%
465
18%
1033
July16th to endNight
79%
522
8%
1469
8%
489
80%
489
27%
972
August1st to 15thNight
76%
536
8%
1516
8%
533
76%
533
28%
1014
August16th to endNight
66%
700
5%
1838
4%
700
66%
700
20%
1383
September1st to 15thNight
67%
660
5%
1815
4%
660
67%
660
20%
1326
September16th to endNight
62%
657
6%
1815
7%
657
62%
657
17%
1382
October1st to 15thNight
69%
660
22%
1919
23%
660
70%
660
29%
1213
October16th to endNight
61%
704
22%
2112
22%
704
65%
704
29%
1340
November1st to 15thNight
65%
700
26%
2101
25%
700
69%
700
34%
1252
November16th to endNight
55%
720
28%
2160
24%
720
62%
720
30%
1347
December1st to 15thNight
61%
720
25%
2280
24%
720
66%
720
29%
1388
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%30%
46062
Night
6%4245%35%6%7%10%42%
45763
TransparencyDay
46%7%14%16%11%3
45763
Night
34%7%18%22%13%3
45566
SeeingDay
8%312%21%25%28%
5437
Night
8%313%30%32%11%
15709

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%437%7%47%7%6%9%36%
2099
May1st to 15thDay
5%3246%36%6%7%9%44%
1976
16th to endDay
7%6%48%9%5%8%7%7%8%25%
2223
June1st to 15thDay
11%6%48%9%5%8%8%8%9%20%
2145
16th to endDay
9%5%39%9%6%9%7%8%10%19%
2145
July1st to 15thDay
9%7%49%8%6%9%9%8%9%16%
2145
16th to endDay
7%5%49%9%6%10%8%8%9%20%
2283
August1st to 15thDay
7%5%39%9%5%9%8%9%10%21%
2090
16th to endDay
9%6%310%11%6%9%8%9%9%16%
2009
September1st to 15thDay
8%6%39%11%6%9%8%8%10%17%
1815
16th to endDay
11%8%410%10%5%8%7%7%8%16%
1815
October1st to 15thDay
6%5%27%8%47%7%8%10%31%
1710
16th to endDay
13%5%35%7%46%6%6%9%29%
1760
November1st to 15thDay
7%5%47%6%45%5%5%8%40%
1757
16th to endDay
11%5%36%5%36%5%6%8%37%
1800
December1st to 15thDay
11%5%46%6%45%5%6%8%35%
1677
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%51%
1750
May1st to 15thNight
431422447%11%52%
1649
16th to endNight
6%434436%6%8%11%40%
1541
June1st to 15thNight
9%6%45%6%46%6%9%13%27%
1485
16th to endNight
5%435%5%37%8%8%11%35%
1485
July1st to 15thNight
7%5%5%7%7%46%7%6%11%30%
1485
16th to endNight
5%425%6%36%8%9%12%36%
1577
August1st to 15thNight
6%425%5%35%6%9%13%36%
1527
16th to endNight
7%5%38%6%47%6%8%12%28%
1838
September1st to 15thNight
6%6%36%7%38%8%9%13%27%
1815
16th to endNight
8%7%38%8%5%6%8%8%10%24%
1815
October1st to 15thNight
6%425%5%46%7%7%9%40%
1919
16th to endNight
11%6%24435%5%6%10%40%
2112
November1st to 15thNight
5%3245%45%5%6%10%45%
2101
16th to endNight
8%5%35%5%3445%8%44%
2160
December1st to 15thNight
7%425%446%5%6%8%44%
2280
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
41%6%9%19%19%4
2099
May1st to 15thDay
33%6%12%25%16%4
1976
16th to endDay
52%6%15%17%8%
2227
June1st to 15thDay
55%8%17%14%4
2145
16th to endDay
53%10%21%12%2
2145
July1st to 15thDay
57%14%19%7%
2006
16th to endDay
53%11%22%11%
2128
August1st to 15thDay
51%11%27%9%
2077
16th to endDay
56%11%23%7%
2009
September1st to 15thDay
56%13%19%9%1
1815
16th to endDay
61%9%14%10%3
1815
October1st to 15thDay
45%6%13%19%13%2
1710
16th to endDay
48%5%7%16%15%6%
1760
November1st to 15thDay
43%47%19%17%6%
1757
16th to endDay
45%47%15%17%9%
1800
December1st to 15thDay
46%410%19%14%5%
1677
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%25%21%5%
1750
May1st to 15thNight
25%415%34%15%4
1650
16th to endNight
34%7%20%27%9%
1543
June1st to 15thNight
43%10%23%16%5%
1485
16th to endNight
37%12%29%18%1
1485
July1st to 15thNight
45%14%30%8%1
1395
16th to endNight
34%13%33%16%1
1469
August1st to 15thNight
35%12%36%14%
1516
16th to endNight
44%16%27%11%
1838
September1st to 15thNight
42%15%29%10%2
1815
16th to endNight
49%13%21%13%2
1815
October1st to 15thNight
36%8%15%20%17%1
1919
16th to endNight
38%5%11%19%19%5%
2112
November1st to 15thNight
34%411%20%22%6%
2101
16th to endNight
38%48%21%18%9%
2160
December1st to 15thNight
37%5%13%23%16%4
2280
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%216%22%32%19%
250
May1st to 15thDay
6%111%16%40%24%
228
16th to endDay
7%16%19%31%34%
267
June1st to 15thDay
9%3416%23%42%
255
16th to endDay
5%136%20%62%
255
July1st to 15thDay
5%115%21%64%
245
16th to endDay
8%148%19%58%
270
August1st to 15thDay
6%216%22%60%
253
16th to endDay
10%128%17%58%
268
September1st to 15thDay
6%1312%21%54%
255
16th to endDay
14%37%27%47%
254
October1st to 15thDay
8%15%27%37%19%
255
16th to endDay
16%216%26%25%12%
272
November1st to 15thDay
10%19%34%29%13%
265
16th to endDay
8%419%34%30%2
270
December1st to 15thDay
17%415%36%21%4
147
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
700
May1st to 15thNight
5%213%45%29%3
660
16th to endNight
6%2433%41%12%
518
June1st to 15thNight
12%2119%46%16%
495
16th to endNight
41210%48%32%
495
July1st to 15thNight
10%17%47%32%
465
16th to endNight
6%16%47%38%
522
August1st to 15thNight
5%17%48%35%
536
16th to endNight
10%2211%42%31%
700
September1st to 15thNight
10%139%45%30%
660
16th to endNight
13%1213%43%25%
657
October1st to 15thNight
9%16%31%41%10%
660
16th to endNight
14%212%29%32%9%
704
November1st to 15thNight
7%117%37%32%4
700
16th to endNight
10%319%37%26%2
720
December1st to 15thNight
10%215%38%31%2
720
16th to endNight
7%317%37%30%3
768
Page generated at 2017-04-26 17:21:36. Version ac04

Copyright 2017 A. Danko


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