Kissimmee
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kissimmee clear sky chart from 2005-11-05 to 2017-09-24.

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
60%
16023
20%
47011
16%
15982
64%
15982
29%
29986

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
47%
718
19%
2327
15%
716
55%
716
24%
1467
January16th to endNight
47%
768
24%
2463
18%
768
56%
768
28%
1468
February1st to 15thNight
46%
701
23%
2103
16%
698
54%
698
33%
1246
February16th to endNight
43%
631
25%
1812
14%
631
53%
631
35%
1063
March1st to 15thNight
51%
720
28%
1980
17%
720
61%
720
40%
1135
March16th to endNight
59%
768
25%
2112
19%
768
64%
768
41%
1202
April1st to 15thNight
61%
718
22%
1976
18%
718
65%
718
40%
1138
April16th to endNight
62%
720
26%
1829
17%
720
66%
720
43%
1080
May1st to 15thNight
70%
602
25%
1682
19%
602
73%
602
41%
956
May16th to endNight
76%
561
20%
1683
16%
561
77%
561
32%
1045
June1st to 15thNight
68%
540
12%
1620
10%
540
68%
540
21%
1158
June16th to endNight
70%
540
8%
1620
7%
540
70%
540
19%
1201
July1st to 15thNight
71%
510
6%
1530
5%
510
71%
510
18%
1172
July16th to endNight
75%
564
7%
1595
8%
531
76%
531
20%
1164
August1st to 15thNight
79%
539
6%
1609
6%
536
79%
536
24%
1123
August16th to endNight
64%
738
7%
2036
7%
738
64%
738
20%
1504
September1st to 15thNight
64%
720
7%
1980
7%
720
64%
720
17%
1507
September16th to endNight
59%
693
11%
1914
11%
693
59%
693
18%
1432
October1st to 15thNight
68%
660
24%
1889
25%
660
70%
660
31%
1189
October16th to endNight
62%
704
27%
2112
25%
704
67%
704
30%
1300
November1st to 15thNight
61%
700
29%
2101
25%
700
68%
700
36%
1213
November16th to endNight
53%
720
28%
2202
22%
720
62%
720
32%
1319
December1st to 15thNight
55%
720
25%
2340
23%
720
61%
720
28%
1406
December16th to endNight
54%
768
22%
2496
21%
768
59%
768
28%
1498

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%7%46%6%6%8%35%
47896
Night
7%5%25%5%35%5%6%9%43%
47219
TransparencyDay
43%9%13%14%12%5%
47597
Night
35%9%15%19%13%5%
47022
SeeingDay
9%212%21%25%29%
5863
Night
9%217%32%29%9%
16031

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
11%5%26%6%35%46%8%39%
1611
16th to endDay
11%6%35%41346%7%46%
1758
February1st to 15thDay
10%6%24445%46%6%44%
1750
16th to endDay
8%426%6%25%446%46%
1658
March1st to 15thDay
5%425%5%35%46%6%50%
1980
16th to endDay
7%425%5%445%5%7%46%
2111
April1st to 15thDay
5%4246%45%5%5%9%44%
1972
16th to endDay
6%4246%46%6%7%7%44%
2130
May1st to 15thDay
5%425%5%36%5%5%7%47%
2277
16th to endDay
6%447%8%48%6%6%8%33%
2431
June1st to 15thDay
12%6%49%8%46%7%7%9%23%
2340
16th to endDay
8%7%38%9%5%8%7%7%8%23%
2340
July1st to 15thDay
8%7%39%10%5%9%7%7%8%21%
2340
16th to endDay
8%7%49%10%6%9%7%7%6%21%
2465
August1st to 15thDay
5%5%39%10%6%8%9%8%10%22%
2340
16th to endDay
11%7%48%10%5%8%6%7%8%21%
2147
September1st to 15thDay
9%7%38%10%5%8%9%7%7%22%
1980
16th to endDay
11%7%310%10%5%7%6%6%9%20%
1905
October1st to 15thDay
8%6%26%8%5%6%6%6%6%36%
1741
16th to endDay
8%425%5%46%5%5%7%44%
1760
November1st to 15thDay
5%325%5%25%46%8%49%
1757
16th to endDay
7%5%26%6%46%5%5%8%40%
1755
December1st to 15thDay
9%6%36%6%35%46%7%39%
1620
16th to endDay
8%5%146%45%5%6%7%44%
1728
January1st to 15thNight
9%6%35%435%45%8%42%
2327
16th to endNight
11%43442445%7%46%
2463
February1st to 15thNight
10%5%2432335%6%51%
2103
16th to endNight
8%4145%3445%8%50%
1812
March1st to 15thNight
5%315%435%447%55%
1980
16th to endNight
5%31343446%8%55%
2112
April1st to 15thNight
5%3144145%5%8%54%
1976
16th to endNight
5%32432445%8%54%
1829
May1st to 15thNight
32135%345%5%8%54%
1682
16th to endNight
6%324445%6%6%10%46%
1682
June1st to 15thNight
8%6%36%6%5%7%6%6%9%33%
1620
16th to endNight
7%6%37%6%47%7%7%11%30%
1620
July1st to 15thNight
7%6%35%7%48%6%7%11%29%
1620
16th to endNight
4437%7%48%8%8%12%29%
1703
August1st to 15thNight
2427%7%46%7%9%12%35%
1620
16th to endNight
9%6%26%7%37%6%9%11%29%
2036
September1st to 15thNight
7%6%36%7%47%6%8%9%30%
1980
16th to endNight
10%7%37%7%45%6%7%10%28%
1914
October1st to 15thNight
7%425%5%446%6%7%46%
1889
16th to endNight
8%6%25%5%24447%47%
2112
November1st to 15thNight
6%324434448%52%
2101
16th to endNight
8%425%435%45%8%47%
2202
December1st to 15thNight
8%5%25%435%45%8%45%
2340
16th to endNight
7%5%25%5%35%6%6%8%44%
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
41%6%9%18%17%6%
1612
16th to endDay
36%5%8%17%22%9%
1758
February1st to 15thDay
37%5%9%12%21%13%
1752
16th to endDay
38%5%10%14%21%9%
1658
March1st to 15thDay
30%7%11%22%19%8%
1980
16th to endDay
35%7%11%18%19%8%
2112
April1st to 15thDay
35%8%12%18%19%7%
1972
16th to endDay
36%7%9%17%20%8%
2130
May1st to 15thDay
33%6%13%19%19%7%
2277
16th to endDay
44%9%13%16%13%2
2435
June1st to 15thDay
52%11%15%15%3
2340
16th to endDay
53%13%19%10%3
2340
July1st to 15thDay
56%14%18%8%1
2201
16th to endDay
56%14%18%10%1
2310
August1st to 15thDay
50%16%23%8%
2327
16th to endDay
56%14%19%8%1
2147
September1st to 15thDay
54%15%17%9%3
1980
16th to endDay
55%12%16%9%41
1905
October1st to 15thDay
43%9%10%14%14%7%
1741
16th to endDay
36%7%9%14%21%10%
1760
November1st to 15thDay
31%6%9%21%22%8%
1757
16th to endDay
39%7%8%17%15%11%
1755
December1st to 15thDay
42%7%10%17%17%5%
1620
16th to endDay
36%6%14%19%15%7%
1728
January1st to 15thNight
40%6%10%20%15%7%
2327
16th to endNight
36%410%20%19%8%
2463
February1st to 15thNight
33%410%16%21%13%
2112
16th to endNight
31%5%14%18%21%8%
1812
March1st to 15thNight
27%5%12%27%20%6%
1980
16th to endNight
26%6%14%24%20%8%
2112
April1st to 15thNight
25%7%15%23%19%7%
1976
16th to endNight
26%6%15%22%21%6%
1829
May1st to 15thNight
25%7%15%25%17%7%
1683
16th to endNight
32%9%16%22%17%1
1684
June1st to 15thNight
44%11%19%19%4
1620
16th to endNight
44%15%19%17%3
1620
July1st to 15thNight
45%17%23%11%2
1530
16th to endNight
40%17%27%13%1
1595
August1st to 15thNight
34%18%35%10%
1609
16th to endNight
44%14%26%13%1
2036
September1st to 15thNight
45%17%19%15%2
1980
16th to endNight
48%13%18%14%32
1914
October1st to 15thNight
34%8%12%20%17%6%
1889
16th to endNight
35%6%8%17%23%8%
2112
November1st to 15thNight
29%6%12%21%21%8%
2101
16th to endNight
33%6%10%19%17%11%
2202
December1st to 15thNight
36%5%13%24%13%6%
2340
16th to endNight
34%7%13%21%14%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
21%8%28%25%10%5%
90
16th to endDay
13%12%33%21%14%4
96
February1st to 15thDay
411%28%28%16%10%
90
16th to endDay
11%5%34%35%11%1
159
March1st to 15thDay
6%427%32%25%2
270
16th to endDay
9%5%18%26%30%8%
288
April1st to 15thDay
5%422%30%27%10%
270
16th to endDay
8%14%27%29%20%
270
May1st to 15thDay
4112%25%35%21%
288
16th to endDay
6%26%21%28%34%
331
June1st to 15thDay
15%15%14%22%39%
315
16th to endDay
6%411%22%54%
315
July1st to 15thDay
9%16%17%65%
305
16th to endDay
9%1310%19%56%
326
August1st to 15thDay
7%49%21%56%
313
16th to endDay
12%149%19%52%
332
September1st to 15thDay
12%15%10%22%47%
315
16th to endDay
11%416%28%40%
287
October1st to 15thDay
10%16%25%36%19%
255
16th to endDay
9%118%27%33%9%
272
November1st to 15thDay
4113%36%32%12%
265
16th to endDay
8%318%40%23%5%
225
December1st to 15thDay
11%5%24%43%14%1
90
16th to endDay
4410%39%33%8%
96
January1st to 15thNight
12%6%26%35%17%1
720
16th to endNight
12%5%29%37%14%
768
February1st to 15thNight
12%5%30%37%12%1
704
16th to endNight
10%435%40%9%
631
March1st to 15thNight
7%432%39%15%
720
16th to endNight
7%325%43%19%1
768
April1st to 15thNight
5%322%45%21%
718
16th to endNight
5%321%45%22%1
720
May1st to 15thNight
4114%46%30%2
603
16th to endNight
5%7%34%41%8%
563
June1st to 15thNight
9%15%23%45%14%
540
16th to endNight
8%1314%44%27%
540
July1st to 15thNight
9%210%45%31%
510
16th to endNight
5%28%48%34%
564
August1st to 15thNight
3112%49%32%
539
16th to endNight
13%5%14%39%26%
738
September1st to 15thNight
11%5%18%42%21%
720
16th to endNight
14%6%22%43%12%
693
October1st to 15thNight
10%8%34%39%6%
660
16th to endNight
12%214%33%31%4
704
November1st to 15thNight
7%220%37%29%4
700
16th to endNight
9%325%39%20%1
720
December1st to 15thNight
9%422%39%22%1
720
16th to endNight
8%424%38%23%1
768
Page generated at 2017-09-25 09:02:27. Version ac04

Copyright 2017 A. Danko


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