Lemon Bay Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lemon Bay Park clear sky chart from 2005-11-06 to 2024-03-06.

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%
24682
19%
80001
18%
24593
68%
24593
28%
49997

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
55%
749
19%
4051
19%
737
62%
737
17%
2472
January11th to 20thNight
55%
754
16%
4096
22%
740
62%
740
15%
2881
January21st to endNight
47%
828
16%
4124
17%
814
55%
814
18%
2414
February1st to 10thNight
50%
760
24%
2280
18%
760
56%
760
31%
1393
February11th to 20thNight
58%
740
25%
2219
19%
740
65%
740
38%
1258
February21st to endNight
63%
628
28%
1812
23%
628
67%
628
39%
1035
March1st to 10thNight
59%
743
32%
2042
22%
743
66%
743
48%
1082
March11th to 20thNight
61%
720
29%
1980
20%
720
68%
720
43%
1116
March21st to endNight
66%
792
30%
2178
23%
792
70%
792
46%
1197
April1st to 10thNight
67%
720
24%
1980
19%
720
70%
720
45%
1088
April11th to 20thNight
62%
711
21%
1953
16%
711
65%
711
39%
1154
April21st to endNight
67%
720
30%
1854
21%
720
70%
720
46%
1074
May1st to 10thNight
81%
576
31%
1656
26%
576
83%
576
54%
825
May11th to 20thNight
71%
531
17%
1592
14%
531
73%
531
32%
971
May21st to endNight
74%
582
22%
1745
20%
582
74%
582
35%
1053
June1st to 10thNight
68%
540
14%
1620
13%
540
68%
540
25%
1099
June11th to 20thNight
79%
540
11%
1620
9%
540
79%
540
27%
1080
June21st to endNight
75%
540
9%
1620
8%
540
75%
540
24%
1127
July1st to 10thNight
77%
525
6%
1575
5%
525
77%
525
21%
1139
July11th to 20thNight
72%
522
4%
1566
4%
522
72%
522
20%
1165
July21st to endNight
78%
591
8%
1672
8%
558
79%
558
21%
1206
August1st to 10thNight
76%
537
3%
1646
4%
534
76%
534
23%
1159
August11th to 20thNight
75%
541
5%
1783
6%
541
75%
541
20%
1250
August21st to endNight
66%
792
7%
2178
7%
792
66%
792
16%
1679
September1st to 10thNight
70%
720
7%
1980
7%
720
70%
720
20%
1455
September11th to 20thNight
66%
720
9%
1980
9%
720
66%
720
19%
1447
September21st to endNight
61%
720
13%
1980
13%
720
62%
720
20%
1455
October1st to 10thNight
66%
720
21%
1980
20%
720
67%
720
28%
1298
October11th to 20thNight
66%
720
25%
2110
24%
720
68%
720
32%
1294
October21st to endNight
63%
792
25%
2376
25%
792
67%
792
34%
1403
November1st to 10thNight
62%
740
26%
2221
24%
740
68%
740
37%
1298
November11th to 20thNight
59%
760
28%
2280
26%
760
65%
760
34%
1345
November21st to endNight
61%
760
27%
2376
26%
760
65%
760
34%
1360
December1st to 10thNight
62%
760
25%
2470
25%
760
67%
760
33%
1396
December11th to 20thNight
59%
758
25%
2939
23%
758
63%
758
27%
1614
December21st to endNight
59%
830
14%
4467
24%
817
63%
817
18%
2715

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
7%5%25%5%46%6%7%10%43%
78988
Night
7%5%25%6%45%6%7%10%42%
80538
TransparencyDay
35%11%17%19%14%4
78711
Night
35%9%17%20%14%4
80334
SeeingDay
7%313%25%30%21%
14567
Night
8%314%33%31%11%
24720

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
10%8%37%6%35%46%10%38%
2836
11th to 20thDay
18%9%47%5%3445%8%34%
2840
21st to endDay
10%6%36%5%35%5%7%8%42%
3448
February1st to 10thDay
10%425%5%345%6%7%50%
1900
11th to 20thDay
6%434323448%58%
1848
21st to endDay
5%5%2342445%9%57%
1641
March1st to 10thDay
33133245%5%8%63%
2035
11th to 20thDay
5%3143235%5%10%58%
1980
21st to endDay
5%323424447%62%
2178
April1st to 10thDay
5%21342446%11%57%
1980
11th to 20thDay
6%3244346%7%9%51%
1956
21st to endDay
5%213325%46%9%59%
2106
May1st to 10thDay
221332235%9%67%
2317
11th to 20thDay
7%5%244346%8%11%47%
2301
21st to endDay
5%5%246%36%6%7%10%46%
2531
June1st to 10thDay
10%6%36%5%46%7%8%12%33%
2340
11th to 20thDay
6%5%25%5%46%7%11%13%36%
2340
21st to endDay
6%5%36%8%5%7%6%9%13%32%
2340
July1st to 10thDay
7%5%25%6%48%8%10%14%31%
2340
11th to 20thDay
5%426%8%5%9%9%12%14%26%
2340
21st to endDay
6%437%7%5%9%10%11%12%27%
2547
August1st to 10thDay
5%425%7%5%8%10%10%15%29%
2274
11th to 20thDay
5%5%36%7%5%8%8%10%14%28%
2099
21st to endDay
10%5%37%8%6%7%8%10%11%25%
2178
September1st to 10thDay
5%436%8%5%9%9%8%12%29%
1980
11th to 20thDay
8%6%36%7%5%7%8%8%10%33%
1980
21st to endDay
6%5%27%8%5%7%8%9%11%34%
1980
October1st to 10thDay
8%5%36%6%45%6%6%10%42%
1980
11th to 20thDay
6%425%5%35%6%6%8%50%
1848
21st to endDay
8%42443447%10%49%
1980
November1st to 10thDay
7%41443346%8%55%
1857
11th to 20thDay
8%435%5%345%6%9%48%
1900
21st to endDay
6%435%3445%6%8%51%
1801
December1st to 10thDay
5%435%435%6%6%10%50%
1710
11th to 20thDay
8%5%25%5%36%5%5%9%46%
2153
21st to endDay
10%7%38%8%45%6%6%8%35%
3124
January1st to 10thNight
9%7%46%7%5%6%6%6%9%36%
4109
11th to 20thNight
16%10%48%7%45%5%5%7%29%
4120
21st to endNight
8%6%37%6%46%7%8%9%36%
4204
February1st to 10thNight
10%5%36%5%35%5%5%7%47%
2280
11th to 20thNight
8%4244345%6%8%52%
2218
21st to endNight
6%5%24435%5%6%8%53%
1812
March1st to 10thNight
431443345%9%60%
2042
11th to 20thNight
5%3135%345%7%8%54%
1980
21st to endNight
43244345%5%9%57%
2178
April1st to 10thNight
43144345%7%10%55%
1980
11th to 20thNight
5%5%25%6%346%6%9%50%
1953
21st to endNight
5%3145%35%45%9%56%
1854
May1st to 10thNight
221332445%9%64%
1656
11th to 20thNight
7%425%5%35%6%6%9%47%
1592
21st to endNight
5%425%6%246%7%8%50%
1744
June1st to 10thNight
10%6%36%6%45%7%7%11%35%
1620
11th to 20thNight
4426%6%5%6%7%8%13%39%
1620
21st to endNight
6%5%246%5%6%7%10%15%34%
1620
July1st to 10thNight
6%5%35%7%37%7%9%13%34%
1620
11th to 20thNight
45%37%8%46%8%10%15%28%
1620
21st to endNight
5%436%7%46%10%10%16%31%
1771
August1st to 10thNight
5%5%37%6%47%7%9%15%31%
1657
11th to 20thNight
6%5%27%7%5%7%8%8%15%30%
1783
21st to endNight
10%5%37%8%5%9%6%9%11%27%
2178
September1st to 10thNight
6%437%7%48%8%10%15%29%
1980
11th to 20thNight
8%5%26%8%5%7%8%9%11%31%
1980
21st to endNight
9%7%48%8%45%7%7%10%31%
1980
October1st to 10thNight
7%5%36%6%36%5%7%11%40%
1980
11th to 20thNight
7%6%35%5%445%6%8%47%
2110
21st to endNight
8%5%25%5%45%5%6%9%46%
2376
November1st to 10thNight
7%425%5%3446%9%51%
2221
11th to 20thNight
8%426%5%35%5%5%7%50%
2280
21st to endNight
7%4245%35%6%7%9%48%
2376
December1st to 10thNight
6%5%35%5%35%6%6%9%49%
2470
11th to 20thNight
9%6%25%4345%6%8%48%
3042
21st to endNight
11%7%36%7%46%6%7%10%34%
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
40%8%9%21%19%4
2837
11th to 20thDay
49%5%6%17%18%4
2840
21st to endDay
38%6%9%23%20%5%
3448
February1st to 10thDay
32%8%11%20%20%9%
1900
11th to 20thDay
24%5%11%24%25%10%
1858
21st to endDay
24%8%13%18%28%8%
1641
March1st to 10thDay
20%6%13%27%26%9%
2035
11th to 20thDay
23%6%12%31%20%8%
1980
21st to endDay
24%6%13%27%24%7%
2178
April1st to 10thDay
23%8%19%28%16%6%
1980
11th to 20thDay
27%9%17%20%21%5%
1956
21st to endDay
22%9%14%23%28%5%
2106
May1st to 10thDay
16%6%15%31%25%7%
2317
11th to 20thDay
32%10%18%22%16%2
2305
21st to endDay
33%12%16%23%15%1
2531
June1st to 10thDay
44%14%22%16%4
2340
11th to 20thDay
38%15%25%20%2
2340
21st to endDay
45%14%25%13%2
2340
July1st to 10thDay
44%19%27%9%1
2275
11th to 20thDay
46%19%26%9%1
2271
21st to endDay
45%18%24%12%1
2405
August1st to 10thDay
41%18%32%9%
2261
11th to 20thDay
46%18%26%10%
2099
21st to endDay
49%17%23%9%1
2178
September1st to 10thDay
44%18%26%12%1
1980
11th to 20thDay
44%17%21%15%3
1980
21st to endDay
42%15%18%15%9%2
1980
October1st to 10thDay
39%11%14%17%13%6%
1980
11th to 20thDay
32%8%11%22%22%5%
1848
21st to endDay
31%7%12%20%21%10%
1980
November1st to 10thDay
27%7%14%22%18%12%
1857
11th to 20thDay
34%6%12%24%18%8%
1900
21st to endDay
31%7%12%22%21%7%
1801
December1st to 10thDay
29%8%15%26%17%5%
1710
11th to 20thDay
34%6%11%22%17%11%
2150
21st to endDay
44%8%12%18%15%3
3124
January1st to 10thNight
41%9%11%20%15%4
4109
11th to 20thNight
53%6%8%18%12%3
4120
21st to endNight
39%7%12%18%19%5%
4204
February1st to 10thNight
35%6%10%20%20%9%
2280
11th to 20thNight
29%6%11%23%21%11%
2219
21st to endNight
27%7%12%19%27%8%
1812
March1st to 10thNight
21%5%12%31%24%7%
2042
11th to 20thNight
25%6%14%29%20%6%
1980
21st to endNight
22%7%14%26%25%6%
2178
April1st to 10thNight
22%7%19%30%15%6%
1980
11th to 20thNight
28%8%16%23%20%5%
1953
21st to endNight
25%6%13%26%27%4
1854
May1st to 10thNight
16%6%13%32%24%9%
1656
11th to 20thNight
31%10%19%23%16%1
1593
21st to endNight
30%9%18%25%18%1
1745
June1st to 10thNight
40%11%21%22%6%
1620
11th to 20thNight
35%14%29%19%4
1620
21st to endNight
35%17%29%14%5%
1620
July1st to 10thNight
40%17%32%10%1
1575
11th to 20thNight
42%16%31%9%
1566
21st to endNight
35%21%30%13%
1672
August1st to 10thNight
38%16%35%10%1
1646
11th to 20thNight
39%17%35%9%1
1783
21st to endNight
47%17%23%11%1
2178
September1st to 10thNight
39%20%27%13%1
1980
11th to 20thNight
42%17%23%16%2
1980
21st to endNight
45%13%20%13%8%1
1980
October1st to 10thNight
36%11%16%18%14%6%
1980
11th to 20thNight
34%8%13%21%21%4
2110
21st to endNight
33%6%13%18%21%9%
2376
November1st to 10thNight
31%6%12%20%19%11%
2221
11th to 20thNight
32%7%11%23%19%8%
2280
21st to endNight
30%7%13%23%20%7%
2376
December1st to 10thNight
30%7%14%28%17%4
2470
11th to 20thNight
33%5%11%23%17%11%
3044
21st to endNight
41%7%17%16%15%4
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
9%8%30%36%16%1
270
11th to 20thDay
10%8%28%31%18%4
270
21st to endDay
12%7%37%34%9%1
297
February1st to 10thDay
9%6%24%39%19%4
270
11th to 20thDay
5%429%37%21%4
270
21st to endDay
5%5%22%42%22%4
296
March1st to 10thDay
3333%40%19%2
440
11th to 20thDay
7%424%34%28%3
420
21st to endDay
5%323%40%26%4
462
April1st to 10thDay
5%5%24%39%23%4
420
11th to 20thDay
8%419%38%26%5%
412
21st to endDay
6%216%34%38%4
420
May1st to 10thDay
313%35%37%12%
423
11th to 20thDay
9%211%29%32%17%
447
21st to endDay
7%26%18%39%26%
485
June1st to 10thDay
12%19%19%34%25%
450
11th to 20thDay
6%16%15%33%38%
450
21st to endDay
6%1211%29%52%
450
July1st to 10thDay
7%135%26%58%
445
11th to 20thDay
5%125%33%54%
444
21st to endDay
9%15%11%27%47%
488
August1st to 10thDay
6%127%31%52%
446
11th to 20thDay
6%117%33%51%
439
21st to endDay
10%16%14%30%39%
495
September1st to 10thDay
6%25%8%34%45%
450
11th to 20thDay
9%2313%36%37%
450
21st to endDay
6%2417%40%32%
450
October1st to 10thDay
8%39%29%40%11%
450
11th to 20thDay
6%48%30%38%14%
450
21st to endDay
9%311%32%35%9%
495
November1st to 10thDay
7%415%30%35%9%
455
11th to 20thDay
11%5%16%36%27%6%
460
21st to endDay
8%321%34%27%7%
361
December1st to 10thDay
6%6%24%35%21%9%
270
11th to 20thDay
8%7%21%35%23%6%
270
21st to endDay
7%423%34%26%5%
297
January1st to 10thNight
9%6%22%43%18%2
760
11th to 20thNight
11%5%22%43%18%1
760
21st to endNight
12%6%28%39%14%
836
February1st to 10thNight
12%427%39%18%
760
11th to 20thNight
9%322%45%20%1
743
21st to endNight
9%419%45%24%
628
March1st to 10thNight
46%25%46%18%1
743
11th to 20thNight
7%421%44%23%1
720
21st to endNight
5%222%48%22%1
792
April1st to 10thNight
4320%46%26%1
720
11th to 20thNight
6%420%46%23%1
711
21st to endNight
6%217%48%26%2
720
May1st to 10thNight
319%47%37%3
576
11th to 20thNight
7%18%43%36%6%
531
21st to endNight
7%35%31%47%8%
584
June1st to 10thNight
11%2425%43%17%
540
11th to 20thNight
41311%55%26%
540
21st to endNight
7%229%43%39%
540
July1st to 10thNight
9%12440%45%
525
11th to 20thNight
4127%40%47%
522
21st to endNight
5%27%42%44%
591
August1st to 10thNight
6%116%47%40%
537
11th to 20thNight
6%117%36%50%
541
21st to endNight
10%1415%40%29%
792
September1st to 10thNight
7%1313%48%28%
720
11th to 20thNight
10%2416%45%23%
720
21st to endNight
10%25%22%42%19%
720
October1st to 10thNight
9%29%38%35%8%
720
11th to 20thNight
9%311%31%40%5%
720
21st to endNight
11%214%38%30%5%
792
November1st to 10thNight
8%221%42%24%3
740
11th to 20thNight
9%318%42%26%2
760
21st to endNight
8%320%43%24%1
760
December1st to 10thNight
7%320%39%30%2
760
11th to 20thNight
10%419%39%24%3
760
21st to endNight
9%321%40%24%2
836
Page generated at 2024-03-03 06:29:00. Version ac07

Copyright © 2024 Attilla Danko.


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