WHAC Kissimmee Stargaze
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the WHAC Kissimmee Stargaze clear sky chart from 2005-11-05 to 2017-10-31.

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
61%
16209
20%
47446
16%
16168
65%
16168
30%
30052

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
50%
718
19%
2327
15%
716
56%
716
26%
1444
January16th to endNight
49%
768
24%
2457
19%
768
58%
768
30%
1465
February1st to 15thNight
47%
701
23%
2103
17%
698
56%
698
33%
1265
February16th to endNight
51%
631
27%
1802
17%
631
61%
631
38%
1029
March1st to 15thNight
51%
720
30%
1980
18%
720
62%
720
42%
1106
March16th to endNight
57%
768
26%
2112
19%
768
62%
768
43%
1172
April1st to 15thNight
62%
718
23%
1976
19%
718
67%
718
43%
1106
April16th to endNight
61%
720
27%
1830
17%
720
66%
720
42%
1086
May1st to 15thNight
69%
626
26%
1706
18%
626
72%
626
41%
978
May16th to endNight
74%
561
21%
1682
16%
561
76%
561
34%
1025
June1st to 15thNight
69%
540
10%
1620
8%
540
69%
540
21%
1177
June16th to endNight
73%
540
9%
1620
7%
540
73%
540
21%
1178
July1st to 15thNight
70%
510
7%
1530
6%
510
70%
510
19%
1159
July16th to endNight
75%
564
8%
1595
8%
531
75%
531
21%
1171
August1st to 15thNight
77%
539
6%
1609
7%
536
77%
536
24%
1121
August16th to endNight
65%
752
6%
2053
6%
752
65%
752
19%
1535
September1st to 15thNight
63%
720
7%
1980
6%
720
63%
720
18%
1490
September16th to endNight
60%
717
11%
1980
12%
717
60%
717
20%
1450
October1st to 15thNight
66%
720
22%
2063
24%
720
68%
720
30%
1314
October16th to endNight
61%
768
27%
2303
26%
768
66%
768
31%
1409
November1st to 15thNight
63%
700
31%
2101
29%
700
69%
700
38%
1201
November16th to endNight
55%
720
29%
2181
25%
720
62%
720
32%
1316
December1st to 15thNight
56%
720
25%
2340
23%
720
61%
720
30%
1391
December16th to endNight
57%
768
23%
2496
22%
768
62%
768
30%
1464

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%34%
48287
Night
7%425%5%35%5%6%9%43%
47655
TransparencyDay
44%8%13%15%12%5%
47988
Night
35%8%16%20%14%5%
47458
SeeingDay
9%212%20%25%29%
6047
Night
9%216%32%29%9%
16217

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%6%246%35%6%6%8%38%
1611
16th to endDay
9%4245%25%45%8%46%
1764
February1st to 15thDay
11%5%25%5%3435%7%45%
1750
16th to endDay
8%5%25%5%345%5%6%46%
1670
March1st to 15thDay
5%215%445%6%5%8%49%
1980
16th to endDay
7%325%5%36%45%8%46%
2111
April1st to 15thDay
6%325%6%46%6%7%7%43%
1972
16th to endDay
6%425%6%5%6%5%5%9%42%
2130
May1st to 15thDay
43146%47%7%5%7%45%
2253
16th to endDay
7%5%27%7%5%8%7%7%8%32%
2431
June1st to 15thDay
12%7%38%8%5%7%6%7%9%22%
2340
16th to endDay
9%6%48%10%47%7%8%9%22%
2340
July1st to 15thDay
10%6%49%10%5%9%7%7%9%20%
2340
16th to endDay
9%6%310%9%5%9%7%8%9%20%
2465
August1st to 15thDay
6%6%39%9%6%8%8%8%11%22%
2340
16th to endDay
10%7%39%9%6%8%7%7%8%20%
2133
September1st to 15thDay
8%7%49%9%47%7%7%9%22%
1980
16th to endDay
11%8%38%9%6%7%6%6%8%21%
1980
October1st to 15thDay
10%5%26%7%5%6%5%6%8%34%
1896
16th to endDay
10%425%6%35%46%7%43%
1920
November1st to 15thDay
5%3245%36%6%6%8%46%
1757
16th to endDay
7%437%6%36%5%48%41%
1776
December1st to 15thDay
10%6%36%6%35%46%7%38%
1620
16th to endDay
7%435%5%35%5%6%8%43%
1728
January1st to 15thNight
9%6%25%5%35%5%5%9%40%
2327
16th to endNight
11%5%24425%46%8%45%
2457
February1st to 15thNight
11%5%2432435%6%49%
2103
16th to endNight
7%2134245%7%8%50%
1802
March1st to 15thNight
4315%42445%7%56%
1980
16th to endNight
5%315%433448%55%
2112
April1st to 15thNight
42144235%6%9%54%
1976
16th to endNight
6%3234245%5%7%54%
1830
May1st to 15thNight
5%213425%45%7%56%
1706
16th to endNight
5%3145%35%5%7%10%45%
1682
June1st to 15thNight
8%7%37%6%5%7%7%8%10%27%
1620
16th to endNight
6%7%36%6%46%6%9%10%31%
1620
July1st to 15thNight
9%7%36%6%45%7%8%9%31%
1620
16th to endNight
5%5%37%7%47%7%8%11%30%
1703
August1st to 15thNight
45%25%7%47%6%7%13%35%
1620
16th to endNight
10%436%7%45%7%9%10%29%
2053
September1st to 15thNight
7%6%38%7%46%6%8%11%28%
1980
16th to endNight
10%7%29%7%45%6%7%10%28%
1980
October1st to 15thNight
8%425%6%36%5%5%8%43%
2063
16th to endNight
10%5%25%42445%7%47%
2303
November1st to 15thNight
7%3245%245%5%7%51%
2101
16th to endNight
8%425%435%5%6%7%46%
2181
December1st to 15thNight
9%435%4345%5%8%44%
2340
16th to endNight
6%425%5%35%5%6%8%46%
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
42%6%7%20%17%5%
1612
16th to endDay
35%47%19%22%9%
1764
February1st to 15thDay
38%47%14%22%12%
1752
16th to endDay
36%5%10%16%20%10%
1670
March1st to 15thDay
31%5%11%23%19%8%
1980
16th to endDay
35%5%11%21%19%7%
2112
April1st to 15thDay
36%6%12%19%18%6%
1972
16th to endDay
38%6%10%16%21%8%
2130
May1st to 15thDay
34%7%11%19%19%7%
2253
16th to endDay
44%9%12%18%12%2
2435
June1st to 15thDay
55%8%15%15%3
2340
16th to endDay
53%13%18%11%3
2340
July1st to 15thDay
57%14%19%7%1
2201
16th to endDay
55%13%20%9%1
2310
August1st to 15thDay
50%13%27%8%
2327
16th to endDay
56%13%19%8%1
2133
September1st to 15thDay
53%13%20%10%2
1980
16th to endDay
56%11%17%9%41
1980
October1st to 15thDay
45%7%10%15%14%5%
1896
16th to endDay
39%5%8%13%21%11%
1920
November1st to 15thDay
33%5%7%23%20%9%
1757
16th to endDay
40%6%7%16%16%12%
1776
December1st to 15thDay
42%6%11%17%15%5%
1620
16th to endDay
36%5%12%21%16%7%
1728
January1st to 15thNight
38%6%12%20%16%5%
2327
16th to endNight
35%5%10%22%17%8%
2457
February1st to 15thNight
35%48%17%21%12%
2112
16th to endNight
27%6%13%21%21%8%
1802
March1st to 15thNight
26%411%30%21%6%
1980
16th to endNight
26%414%25%20%8%
2112
April1st to 15thNight
24%7%15%25%20%6%
1976
16th to endNight
27%5%14%24%22%5%
1830
May1st to 15thNight
26%6%14%26%18%7%
1707
16th to endNight
30%9%19%24%16%
1684
June1st to 15thNight
45%11%21%17%4
1620
16th to endNight
42%15%22%17%3
1620
July1st to 15thNight
45%15%25%11%1
1530
16th to endNight
41%16%26%15%
1595
August1st to 15thNight
37%15%36%10%
1609
16th to endNight
44%16%27%11%
2053
September1st to 15thNight
45%15%22%13%2
1980
16th to endNight
46%11%20%15%41
1980
October1st to 15thNight
36%7%13%18%18%4
2063
16th to endNight
35%6%9%17%21%10%
2303
November1st to 15thNight
30%410%25%21%8%
2101
16th to endNight
35%5%8%21%18%11%
2181
December1st to 15thNight
35%5%13%24%13%6%
2340
16th to endNight
33%6%14%21%16%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
22%5%32%23%10%6%
90
16th to endDay
9%16%32%22%15%3
96
February1st to 15thDay
7%12%24%27%20%7%
90
16th to endDay
14%430%33%16%
171
March1st to 15thDay
6%228%32%26%3
270
16th to endDay
9%319%28%30%7%
288
April1st to 15thDay
5%222%30%27%10%
270
16th to endDay
9%113%26%27%21%
270
May1st to 15thDay
4112%22%36%22%
288
16th to endDay
419%19%28%35%
331
June1st to 15thDay
17%7%14%21%38%
315
16th to endDay
7%38%22%57%
315
July1st to 15thDay
5%11320%66%
305
16th to endDay
10%148%18%57%
326
August1st to 15thDay
8%128%19%59%
313
16th to endDay
12%5%12%16%53%
332
September1st to 15thDay
9%16%10%24%47%
315
16th to endDay
13%111%34%38%
314
October1st to 15thDay
13%16%27%35%15%
315
16th to endDay
12%219%27%27%10%
336
November1st to 15thDay
5%13%32%34%13%
265
16th to endDay
9%319%36%26%4
246
December1st to 15thDay
10%8%26%41%12%1
90
16th to endDay
6%5%13%35%30%9%
96
January1st to 15thNight
11%5%24%38%17%1
720
16th to endNight
13%6%26%38%14%
768
February1st to 15thNight
14%427%39%12%
704
16th to endNight
9%330%43%12%
631
March1st to 15thNight
6%432%40%14%1
720
16th to endNight
6%325%44%20%
768
April1st to 15thNight
4223%46%22%
718
16th to endNight
7%221%43%23%
720
May1st to 15thNight
6%114%48%26%2
627
16th to endNight
6%16%34%44%7%
563
June1st to 15thNight
9%1424%47%13%
540
16th to endNight
8%212%46%28%
540
July1st to 15thNight
10%36%46%32%
510
16th to endNight
419%45%37%
564
August1st to 15thNight
6%18%47%35%
539
16th to endNight
10%15%16%40%26%
752
September1st to 15thNight
10%6%16%43%23%
720
16th to endNight
12%15%21%44%15%
717
October1st to 15thNight
10%110%33%38%7%
720
16th to endNight
13%114%35%30%4
768
November1st to 15thNight
7%216%42%26%4
700
16th to endNight
9%124%42%19%1
720
December1st to 15thNight
10%419%40%24%1
720
16th to endNight
7%323%38%24%1
768
Page generated at 2017-11-01 17:23:35. Version ac04

Copyright 2017 A. Danko


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