Kissimmee Park Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kissimmee Park Observatory clear sky chart from 2005-11-06 to 2024-01-12.

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%
24608
20%
74478
16%
24556
63%
24556
28%
47197

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
44%
758
23%
2459
16%
757
54%
757
28%
1468
January11th to 20thNight
53%
728
26%
2365
20%
728
63%
728
30%
1365
January21st to endNight
40%
792
23%
2524
15%
792
50%
792
26%
1537
February1st to 10thNight
47%
720
22%
2160
17%
720
54%
720
31%
1307
February11th to 20thNight
48%
700
23%
2099
14%
700
58%
700
36%
1204
February21st to endNight
47%
592
29%
1650
18%
592
57%
592
38%
963
March1st to 10thNight
50%
720
30%
1980
18%
720
60%
720
45%
1085
March11th to 20thNight
55%
720
28%
1980
19%
720
62%
720
40%
1143
March21st to endNight
54%
792
30%
2178
19%
792
62%
792
42%
1210
April1st to 10thNight
56%
720
24%
1980
18%
720
61%
720
43%
1092
April11th to 20thNight
53%
711
21%
1906
14%
711
57%
711
35%
1163
April21st to endNight
59%
720
28%
1800
17%
720
63%
720
46%
1048
May1st to 10thNight
68%
644
28%
1724
19%
644
71%
644
46%
952
May11th to 20thNight
68%
531
15%
1592
12%
531
71%
531
32%
987
May21st to endNight
72%
582
20%
1744
16%
582
73%
582
30%
1109
June1st to 10thNight
64%
540
12%
1620
10%
540
64%
540
22%
1157
June11th to 20thNight
73%
540
12%
1620
10%
540
73%
540
23%
1135
June21st to endNight
71%
540
8%
1620
7%
540
71%
540
20%
1187
July1st to 10thNight
70%
525
5%
1575
4%
525
70%
525
18%
1191
July11th to 20thNight
72%
522
6%
1566
6%
522
72%
522
20%
1159
July21st to endNight
72%
591
8%
1672
8%
558
73%
558
20%
1221
August1st to 10thNight
76%
537
6%
1600
6%
534
76%
534
24%
1114
August11th to 20thNight
75%
589
6%
1679
6%
589
75%
589
22%
1211
August21st to endNight
61%
792
7%
2178
7%
792
61%
792
17%
1652
September1st to 10thNight
65%
720
8%
1980
7%
720
65%
720
16%
1501
September11th to 20thNight
59%
720
6%
1980
7%
720
59%
720
17%
1500
September21st to endNight
60%
720
16%
1980
15%
720
62%
720
22%
1411
October1st to 10thNight
61%
720
20%
2012
19%
720
63%
720
27%
1329
October11th to 20thNight
69%
720
27%
2160
28%
720
73%
720
33%
1277
October21st to endNight
63%
792
27%
2376
26%
792
68%
792
33%
1411
November1st to 10thNight
57%
740
25%
2221
21%
740
65%
740
34%
1323
November11th to 20thNight
54%
760
27%
2280
23%
760
61%
760
31%
1410
November21st to endNight
52%
760
26%
2337
21%
760
60%
760
30%
1434
December1st to 10thNight
56%
760
27%
2470
24%
760
65%
760
34%
1404
December11th to 20thNight
50%
760
24%
2945
21%
758
57%
758
23%
1723
December21st to endNight
52%
830
15%
4466
21%
817
58%
817
15%
2814

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%37%7%46%6%7%9%38%
74872
Night
8%5%35%6%35%5%6%9%44%
74849
TransparencyDay
42%9%14%17%13%5%
74595
Night
36%9%16%20%14%5%
74645
SeeingDay
8%417%25%24%22%
14492
Night
9%319%33%28%9%
24621

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
11%6%35%4245%6%9%46%
1706
11th to 20thDay
7%5%25%435%5%6%9%48%
1635
21st to endDay
13%5%36%5%3445%8%44%
1827
February1st to 10thDay
12%7%245%35%46%8%44%
1800
11th to 20thDay
6%5%245%4446%6%54%
1748
21st to endDay
9%436%5%35%45%8%47%
1603
March1st to 10thDay
4325%435%46%7%56%
1980
11th to 20thDay
7%4245%35%6%7%8%48%
1980
21st to endDay
7%4246%35%5%5%7%51%
2178
April1st to 10thDay
6%325%6%5%6%6%6%7%48%
1980
11th to 20thDay
9%5%25%6%47%6%7%9%40%
2000
21st to endDay
5%425%6%45%6%6%7%50%
2160
May1st to 10thDay
5%3135%35%46%8%56%
2249
11th to 20thDay
9%5%36%7%5%6%6%6%8%39%
2301
21st to endDay
7%5%38%9%47%7%7%9%34%
2531
June1st to 10thDay
14%7%310%9%5%6%7%7%10%22%
2340
11th to 20thDay
7%5%38%10%5%8%9%7%10%27%
2340
21st to endDay
9%7%48%9%6%8%7%7%9%26%
2340
July1st to 10thDay
9%6%48%10%6%8%9%8%9%24%
2340
11th to 20thDay
9%6%39%9%5%9%8%8%10%24%
2340
21st to endDay
8%6%48%10%6%8%9%7%9%24%
2547
August1st to 10thDay
6%5%38%10%7%8%9%8%11%25%
2327
11th to 20thDay
7%6%38%10%6%8%7%9%11%24%
2194
21st to endDay
11%7%49%8%5%7%7%8%10%24%
2178
September1st to 10thDay
8%6%39%10%5%9%8%7%10%25%
1980
11th to 20thDay
10%7%48%8%6%9%7%9%8%24%
1980
21st to endDay
10%7%37%9%47%8%7%9%28%
1980
October1st to 10thDay
10%6%38%8%5%7%7%6%7%33%
1945
11th to 20thDay
8%5%25%6%36%6%6%8%45%
1800
21st to endDay
8%425%5%35%5%6%8%47%
1980
November1st to 10thDay
7%326%5%46%6%6%9%45%
1857
11th to 20thDay
10%6%25%6%445%5%8%45%
1900
21st to endDay
9%5%36%7%45%5%6%10%40%
1839
December1st to 10thDay
8%436%5%35%6%7%7%45%
1710
11th to 20thDay
12%5%36%6%4445%7%43%
2153
21st to endDay
12%7%38%7%46%7%6%8%34%
3124
January1st to 10thNight
10%6%35%5%35%45%8%46%
2459
11th to 20thNight
8%5%245%45%46%10%46%
2365
21st to endNight
12%5%35%5%35%5%5%6%46%
2524
February1st to 10thNight
11%6%35%5%2445%8%47%
2160
11th to 20thNight
9%42443445%7%53%
2098
21st to endNight
8%4245%35%45%8%53%
1650
March1st to 10thNight
5%31443445%8%59%
1980
11th to 20thNight
8%32443445%9%53%
1980
21st to endNight
5%4245%3445%8%56%
2178
April1st to 10thNight
6%32433445%10%55%
1980
11th to 20thNight
7%425%6%35%5%6%8%49%
1906
21st to endNight
5%3245%3447%8%56%
1800
May1st to 10thNight
43243335%5%8%60%
1724
11th to 20thNight
7%425%6%445%6%9%47%
1592
21st to endNight
6%436%6%46%7%7%9%43%
1744
June1st to 10thNight
12%7%37%6%46%7%5%10%33%
1620
11th to 20thNight
6%6%36%6%5%7%7%7%12%36%
1620
21st to endNight
8%7%37%7%47%6%8%11%31%
1620
July1st to 10thNight
9%6%37%8%47%7%8%10%30%
1620
11th to 20thNight
6%6%47%7%5%7%7%8%10%32%
1620
21st to endNight
5%5%37%8%48%8%9%11%31%
1771
August1st to 10thNight
5%6%37%6%47%7%9%13%34%
1611
11th to 20thNight
4437%8%5%8%8%9%13%31%
1679
21st to endNight
10%7%36%7%47%7%8%11%28%
2178
September1st to 10thNight
8%7%36%7%38%8%9%12%29%
1980
11th to 20thNight
11%8%38%7%5%6%6%7%11%27%
1980
21st to endNight
11%7%37%7%46%6%7%9%34%
1980
October1st to 10thNight
9%5%37%6%45%6%6%8%40%
2012
11th to 20thNight
7%425%6%345%6%8%50%
2160
21st to endNight
9%5%25%5%345%6%7%50%
2376
November1st to 10thNight
9%425%43445%7%51%
2221
11th to 20thNight
10%5%35%5%445%5%8%45%
2280
21st to endNight
10%5%36%5%36%5%6%9%43%
2337
December1st to 10thNight
8%3245%46%45%9%49%
2470
11th to 20thNight
12%7%35%42445%7%47%
3042
21st to endNight
13%6%37%6%36%6%6%7%36%
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
36%5%9%21%19%10%
1707
11th to 20thDay
32%48%24%24%8%
1635
21st to endDay
39%48%18%21%10%
1827
February1st to 10thDay
38%6%11%16%19%11%
1800
11th to 20thDay
30%5%9%21%24%11%
1758
21st to endDay
35%6%10%17%25%8%
1603
March1st to 10thDay
27%5%11%23%25%9%
1980
11th to 20thDay
32%5%11%25%17%9%
1980
21st to endDay
31%411%24%21%9%
2178
April1st to 10thDay
34%7%13%21%17%8%
1980
11th to 20thDay
38%7%12%17%20%5%
2000
21st to endDay
32%6%10%20%24%9%
2160
May1st to 10thDay
26%6%11%22%25%9%
2249
11th to 20thDay
42%7%15%18%16%2
2305
21st to endDay
44%8%13%17%16%2
2531
June1st to 10thDay
55%10%17%14%5%
2340
11th to 20thDay
49%11%20%17%3
2340
21st to endDay
52%11%21%12%31
2340
July1st to 10thDay
54%14%21%9%2
2275
11th to 20thDay
52%14%22%11%
2271
21st to endDay
52%12%23%12%1
2405
August1st to 10thDay
47%16%27%9%1
2314
11th to 20thDay
50%14%24%10%1
2194
21st to endDay
53%13%21%10%3
2178
September1st to 10thDay
51%15%19%11%4
1980
11th to 20thDay
54%12%20%11%3
1980
21st to endDay
50%11%14%13%9%2
1980
October1st to 10thDay
46%9%12%14%11%7%
1945
11th to 20thDay
35%7%11%23%20%4
1800
21st to endDay
34%7%9%18%21%11%
1980
November1st to 10thDay
33%7%12%18%20%10%
1857
11th to 20thDay
38%6%9%21%20%7%
1900
21st to endDay
39%7%9%20%18%6%
1839
December1st to 10thDay
36%6%12%24%16%6%
1710
11th to 20thDay
40%5%11%16%18%11%
2150
21st to endDay
46%8%10%17%13%6%
3124
January1st to 10thNight
36%5%10%20%20%8%
2459
11th to 20thNight
33%6%9%25%19%8%
2365
21st to endNight
38%5%10%20%17%9%
2524
February1st to 10thNight
36%5%12%17%19%10%
2160
11th to 20thNight
31%5%11%21%23%10%
2099
21st to endNight
30%5%13%20%24%7%
1650
March1st to 10thNight
23%6%13%27%24%7%
1980
11th to 20thNight
29%5%14%28%16%8%
1980
21st to endNight
26%5%13%27%22%8%
2178
April1st to 10thNight
24%6%20%27%16%7%
1980
11th to 20thNight
32%7%14%24%19%5%
1906
21st to endNight
24%6%15%25%23%7%
1800
May1st to 10thNight
23%7%13%27%22%10%
1724
11th to 20thNight
32%9%21%22%12%2
1593
21st to endNight
35%9%15%21%18%1
1745
June1st to 10thNight
46%9%21%18%5%
1620
11th to 20thNight
40%13%22%22%3
1620
21st to endNight
42%16%22%15%5%
1620
July1st to 10thNight
46%15%26%9%2
1575
11th to 20thNight
43%16%28%13%1
1566
21st to endNight
41%18%28%12%1
1672
August1st to 10thNight
38%15%36%11%
1600
11th to 20thNight
41%15%32%11%2
1679
21st to endNight
47%16%23%13%2
2178
September1st to 10thNight
45%18%21%13%3
1980
11th to 20thNight
48%15%20%15%2
1980
21st to endNight
46%10%17%16%9%2
1980
October1st to 10thNight
38%10%15%20%12%5%
2012
11th to 20thNight
31%8%11%26%21%4
2160
21st to endNight
32%7%9%20%22%9%
2376
November1st to 10thNight
32%7%11%20%21%9%
2221
11th to 20thNight
36%6%11%21%18%8%
2280
21st to endNight
37%6%10%21%20%6%
2337
December1st to 10thNight
31%6%14%29%14%6%
2470
11th to 20thNight
37%5%9%20%16%12%
3044
21st to endNight
44%8%12%18%13%5%
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
13%8%40%26%11%2
270
11th to 20thDay
6%10%35%30%15%4
245
21st to endDay
15%10%40%26%9%
264
February1st to 10thDay
11%10%32%25%18%4
240
11th to 20thDay
6%6%32%35%15%7%
240
21st to endDay
9%7%30%29%23%2
321
March1st to 10thDay
5%8%32%36%18%1
420
11th to 20thDay
8%6%26%30%26%4
420
21st to endDay
7%5%25%31%25%5%
462
April1st to 10thDay
5%8%28%32%23%4
420
11th to 20thDay
10%7%24%32%19%8%
412
21st to endDay
6%5%20%32%25%12%
420
May1st to 10thDay
5%222%25%32%15%
423
11th to 20thDay
9%314%25%28%21%
447
21st to endDay
6%410%23%29%29%
485
June1st to 10thDay
15%28%23%25%27%
450
11th to 20thDay
7%17%18%29%38%
450
21st to endDay
6%15%17%22%49%
450
July1st to 10thDay
8%1210%24%56%
445
11th to 20thDay
7%147%28%53%
444
21st to endDay
7%15%14%24%49%
488
August1st to 10thDay
7%5%11%28%49%
446
11th to 20thDay
5%1410%23%56%
439
21st to endDay
11%16%16%23%42%
495
September1st to 10thDay
8%27%12%26%46%
450
11th to 20thDay
11%17%19%28%34%
450
21st to endDay
9%27%19%33%30%
450
October1st to 10thDay
11%216%31%28%12%
450
11th to 20thDay
7%415%28%33%12%
450
21st to endDay
7%417%35%31%7%
495
November1st to 10thDay
7%6%17%33%28%9%
455
11th to 20thDay
14%6%20%35%20%5%
460
21st to endDay
10%6%22%39%18%5%
399
December1st to 10thDay
6%9%28%33%19%6%
270
11th to 20thDay
11%5%31%31%18%4
270
21st to endDay
8%9%28%32%20%4
297
January1st to 10thNight
11%8%30%36%14%1
760
11th to 20thNight
9%6%25%44%14%1
728
21st to endNight
13%7%33%36%11%
792
February1st to 10thNight
13%5%28%39%14%1
720
11th to 20thNight
11%5%30%41%12%2
703
21st to endNight
9%433%42%11%
592
March1st to 10thNight
5%5%36%42%13%
720
11th to 20thNight
9%5%27%41%17%1
720
21st to endNight
7%330%43%17%1
792
April1st to 10thNight
6%5%27%46%16%
720
11th to 20thNight
7%5%27%44%17%1
711
21st to endNight
6%426%42%22%1
720
May1st to 10thNight
5%218%45%28%2
644
11th to 20thNight
8%211%41%33%6%
531
21st to endNight
6%29%32%44%7%
584
June1st to 10thNight
13%17%26%44%9%
540
11th to 20thNight
6%26%18%44%25%
540
21st to endNight
8%16%16%45%26%
540
July1st to 10thNight
8%139%48%31%
525
11th to 20thNight
6%138%47%35%
522
21st to endNight
6%210%48%33%
591
August1st to 10thNight
5%411%50%30%
537
11th to 20thNight
5%411%45%35%
589
21st to endNight
12%17%16%39%24%
792
September1st to 10thNight
9%28%17%42%24%
720
11th to 20thNight
12%19%20%41%16%
720
21st to endNight
15%18%25%41%12%
720
October1st to 10thNight
10%114%37%31%6%
720
11th to 20thNight
7%312%35%38%6%
720
21st to endNight
11%216%38%30%4
792
November1st to 10thNight
9%322%35%27%3
740
11th to 20thNight
10%422%40%21%2
760
21st to endNight
11%424%41%18%1
760
December1st to 10thNight
8%424%37%26%1
760
11th to 20thNight
11%6%24%37%22%1
760
21st to endNight
10%5%25%39%20%1
836
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