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 2017-04-30.

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%
15577
20%
45621
17%
15536
65%
15536
30%
28761

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%
717
27%
1822
17%
717
66%
717
42%
1082
May1st to 15thNight
69%
574
27%
1564
19%
574
72%
574
41%
899
May16th to endNight
75%
513
19%
1538
16%
513
76%
513
34%
943
June1st to 15thNight
71%
495
11%
1485
9%
495
71%
495
22%
1056
June16th to endNight
73%
495
9%
1485
7%
495
73%
495
21%
1069
July1st to 15thNight
69%
465
7%
1395
6%
465
69%
465
18%
1077
July16th to endNight
75%
522
8%
1469
9%
489
76%
489
22%
1068
August1st to 15thNight
79%
494
6%
1474
7%
491
79%
491
25%
1019
August16th to endNight
65%
689
5%
1881
5%
689
65%
689
18%
1411
September1st to 15thNight
64%
660
7%
1815
6%
660
64%
660
18%
1352
September16th to endNight
58%
657
10%
1815
11%
657
58%
657
18%
1345
October1st to 15thNight
67%
660
23%
1891
24%
660
69%
660
31%
1187
October16th to endNight
60%
704
26%
2112
25%
704
65%
704
31%
1294
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%36%7%46%6%6%8%35%
46089
Night
7%425%5%35%5%6%9%43%
45830
TransparencyDay
44%8%13%15%12%5%
45790
Night
35%8%16%20%14%5%
45633
SeeingDay
9%212%20%25%29%
5315
Night
9%216%33%29%9%
15585

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%
2118
May1st to 15thDay
5%3246%47%7%5%8%44%
2064
16th to endDay
7%5%37%8%5%8%6%7%8%30%
2223
June1st to 15thDay
12%6%37%8%5%6%7%8%9%23%
2145
16th to endDay
10%6%48%9%47%7%7%9%22%
2145
July1st to 15thDay
11%7%49%10%5%9%7%7%9%18%
2145
16th to endDay
9%6%310%8%6%9%7%8%9%21%
2283
August1st to 15thDay
6%6%39%9%6%7%8%7%11%22%
2145
16th to endDay
10%7%39%10%6%8%8%7%9%19%
1954
September1st to 15thDay
8%7%310%10%48%7%8%9%22%
1815
16th to endDay
12%8%38%10%6%7%6%6%8%20%
1815
October1st to 15thDay
10%426%7%46%5%5%8%36%
1738
16th to endDay
10%425%6%35%36%6%43%
1760
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%55%
1822
May1st to 15thNight
6%313325%45%7%56%
1564
16th to endNight
6%3145%35%5%7%10%45%
1538
June1st to 15thNight
8%6%37%6%47%7%8%11%29%
1485
16th to endNight
6%7%26%6%46%6%9%10%33%
1485
July1st to 15thNight
10%7%37%6%45%7%8%9%29%
1485
16th to endNight
5%5%37%7%47%7%9%11%31%
1577
August1st to 15thNight
45%25%6%46%6%7%13%36%
1485
16th to endNight
10%436%7%45%7%9%10%29%
1881
September1st to 15thNight
7%6%38%6%46%6%8%11%28%
1815
16th to endNight
10%7%29%7%45%6%7%10%26%
1815
October1st to 15thNight
8%425%5%25%5%5%8%45%
1891
16th to endNight
10%6%25%42435%7%47%
2112
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
37%6%10%16%21%8%
2118
May1st to 15thDay
35%7%12%19%18%6%
2064
16th to endDay
46%8%12%18%12%1
2227
June1st to 15thDay
53%8%17%17%3
2145
16th to endDay
53%12%18%11%3
2145
July1st to 15thDay
59%13%18%6%1
2006
16th to endDay
54%12%20%10%1
2128
August1st to 15thDay
51%12%26%8%
2132
16th to endDay
57%13%19%7%1
1954
September1st to 15thDay
53%13%19%10%2
1815
16th to endDay
57%11%15%9%41
1815
October1st to 15thDay
43%8%10%15%15%6%
1738
16th to endDay
39%5%8%14%21%10%
1760
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%13%24%22%5%
1822
May1st to 15thNight
26%6%14%26%18%5%
1565
16th to endNight
30%9%19%24%15%
1540
June1st to 15thNight
43%11%22%18%4
1485
16th to endNight
40%15%22%17%3
1485
July1st to 15thNight
47%15%25%9%2
1395
16th to endNight
40%16%26%15%
1469
August1st to 15thNight
36%15%37%10%
1474
16th to endNight
44%16%27%10%1
1881
September1st to 15thNight
45%14%22%14%2
1815
16th to endNight
48%11%19%14%41
1815
October1st to 15thNight
35%7%13%19%18%5%
1891
16th to endNight
35%6%9%17%22%9%
2112
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%28%21%
266
May1st to 15thDay
49%21%37%25%
228
16th to endDay
5%18%19%29%36%
267
June1st to 15thDay
14%314%23%43%
255
16th to endDay
7%36%22%59%
255
July1st to 15thDay
6%12219%67%
245
16th to endDay
8%138%20%57%
270
August1st to 15thDay
9%139%19%56%
253
16th to endDay
11%5%9%15%57%
268
September1st to 15thDay
8%15%9%23%50%
255
16th to endDay
13%27%31%44%
254
October1st to 15thDay
10%15%29%36%17%
255
16th to endDay
13%117%23%31%11%
272
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%
717
May1st to 15thNight
6%113%48%26%2
575
16th to endNight
6%6%33%44%7%
515
June1st to 15thNight
7%1424%47%14%
495
16th to endNight
8%211%47%28%
495
July1st to 15thNight
11%37%45%31%
465
16th to endNight
419%45%37%
522
August1st to 15thNight
5%29%47%35%
494
16th to endNight
9%15%16%39%27%
689
September1st to 15thNight
9%6%15%43%24%
660
16th to endNight
12%15%21%43%15%
657
October1st to 15thNight
10%19%32%38%7%
660
16th to endNight
13%114%34%30%4
704
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 2017-04-30 20:39:58. Version ac04

Copyright 2017 A. Danko


WHAC Kissimmee Stargaze Clear Sky Chart | Charts Home