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 2005-11-05 to 2018-01-20.

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
58%
16427
20%
48509
16%
16389
63%
16389
27%
30270

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%
776
19%
2522
14%
776
55%
776
23%
1551
January16th to endNight
47%
788
25%
2435
19%
788
55%
788
26%
1476
February1st to 15thNight
47%
701
24%
2104
17%
699
54%
699
28%
1290
February16th to endNight
50%
631
27%
1848
15%
631
62%
631
31%
1060
March1st to 15thNight
52%
720
31%
1980
18%
720
62%
720
38%
1086
March16th to endNight
55%
768
26%
2112
17%
768
62%
768
34%
1210
April1st to 15thNight
61%
718
23%
1976
17%
718
66%
718
40%
1081
April16th to endNight
55%
720
27%
1896
16%
720
62%
720
33%
1138
May1st to 15thNight
66%
563
29%
1643
21%
563
71%
563
39%
875
May16th to endNight
65%
561
22%
1683
16%
561
70%
561
30%
1007
June1st to 15thNight
59%
540
10%
1620
7%
540
61%
540
20%
1135
June16th to endNight
64%
540
8%
1620
5%
540
66%
540
20%
1144
July1st to 15thNight
67%
510
6%
1530
5%
510
67%
510
18%
1146
July16th to endNight
65%
564
8%
1595
8%
531
69%
531
22%
1143
August1st to 15thNight
69%
539
5%
1701
6%
536
69%
536
20%
1188
August16th to endNight
63%
711
7%
2048
7%
711
63%
711
18%
1511
September1st to 15thNight
63%
720
7%
1980
7%
720
63%
720
18%
1462
September16th to endNight
57%
717
10%
1980
8%
717
59%
717
17%
1468
October1st to 15thNight
64%
720
23%
2007
22%
720
66%
720
28%
1260
October16th to endNight
54%
768
24%
2304
20%
768
61%
768
28%
1414
November1st to 15thNight
59%
760
29%
2281
27%
760
66%
760
35%
1283
November16th to endNight
55%
780
30%
2405
24%
780
65%
780
32%
1371
December1st to 15thNight
56%
780
24%
2535
22%
780
61%
780
27%
1488
December16th to endNight
58%
832
26%
2704
24%
832
65%
832
32%
1483

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
6%425%5%35%6%7%10%42%
49004
Night
7%4245%35%5%6%10%44%
48716
TransparencyDay
36%10%16%18%13%4
48705
Night
33%9%17%20%14%4
48519
SeeingDay
7%8%8%20%28%25%
6229
Night
7%15%10%26%28%11%
16437

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
9%5%25%5%25%46%10%41%
1746
16th to endDay
9%5%23435%5%6%7%47%
1891
February1st to 15thDay
10%435%424445%51%
1750
16th to endDay
6%5%2332345%9%53%
1625
March1st to 15thDay
32142245%49%59%
1980
16th to endDay
6%31442345%8%56%
2111
April1st to 15thDay
4214425%45%11%54%
1972
16th to endDay
5%21332446%9%55%
2064
May1st to 15thDay
221232346%8%61%
2316
16th to endDay
5%3145%36%6%7%10%44%
2431
June1st to 15thDay
11%6%26%5%46%7%7%11%30%
2340
16th to endDay
6%5%35%7%47%6%10%13%29%
2340
July1st to 15thDay
7%5%26%7%5%8%8%10%12%24%
2340
16th to endDay
6%426%7%410%10%11%12%23%
2465
August1st to 15thDay
45%25%7%5%8%9%10%13%26%
2244
16th to endDay
10%5%26%7%5%7%8%9%10%25%
2142
September1st to 15thDay
6%5%37%7%5%8%8%8%10%27%
1980
16th to endDay
7%5%27%8%5%6%8%8%10%28%
1980
October1st to 15thDay
6%425%6%45%6%5%9%44%
1951
16th to endDay
10%42442445%8%47%
1920
November1st to 15thDay
5%32443445%8%53%
1907
16th to endDay
6%3243345%47%52%
1882
December1st to 15thDay
6%425%436%5%6%10%45%
1755
16th to endDay
5%41442446%10%49%
1872
January1st to 15thNight
8%5%345%36%5%6%9%41%
2522
16th to endNight
10%5%24435%5%6%8%43%
2435
February1st to 15thNight
11%5%245%24445%49%
2103
16th to endNight
6%423425%46%9%49%
1848
March1st to 15thNight
42134345%6%9%55%
1980
16th to endNight
43234335%5%8%54%
2112
April1st to 15thNight
431332446%10%55%
1976
16th to endNight
5%3145%345%49%52%
1896
May1st to 15thNight
22133245%5%8%60%
1643
16th to endNight
6%3245%245%6%8%50%
1682
June1st to 15thNight
9%5%36%5%45%6%7%10%35%
1620
16th to endNight
5%3246%5%6%7%9%14%33%
1620
July1st to 15thNight
5%5%36%8%37%7%9%12%31%
1620
16th to endNight
5%325%6%36%8%10%16%30%
1703
August1st to 15thNight
5%5%26%6%46%6%8%15%31%
1712
16th to endNight
10%426%7%48%6%8%12%29%
2048
September1st to 15thNight
7%427%7%46%8%9%11%28%
1980
16th to endNight
10%6%36%7%46%7%8%11%28%
1980
October1st to 15thNight
6%4245%36%47%10%45%
2007
16th to endNight
9%6%25%5%3445%8%45%
2304
November1st to 15thNight
6%42442435%8%53%
2281
16th to endNight
7%324425%5%6%8%50%
2405
December1st to 15thNight
7%5%25%4245%5%8%46%
2535
16th to endNight
5%324425%6%7%9%48%
2704

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
37%6%11%22%18%3
1747
16th to endDay
33%5%9%22%21%7%
1891
February1st to 15thDay
33%5%9%19%20%12%
1752
16th to endDay
26%9%13%19%22%9%
1625
March1st to 15thDay
22%6%12%28%21%8%
1980
16th to endDay
28%5%13%24%21%7%
2112
April1st to 15thDay
24%7%19%23%18%5%
1972
16th to endDay
26%7%14%20%25%5%
2064
May1st to 15thDay
20%7%17%28%20%6%
2316
16th to endDay
32%11%17%23%12%1
2435
June1st to 15thDay
46%14%21%14%2
2340
16th to endDay
44%16%21%14%2
2340
July1st to 15thDay
48%21%20%7%1
2201
16th to endDay
46%18%23%10%1
2310
August1st to 15thDay
44%18%28%8%
2231
16th to endDay
50%17%22%8%
2142
September1st to 15thDay
48%17%22%10%1
1980
16th to endDay
48%14%18%12%4
1980
October1st to 15thDay
36%10%12%17%16%6%
1951
16th to endDay
35%6%9%16%20%10%
1920
November1st to 15thDay
28%5%11%23%22%9%
1907
16th to endDay
30%7%11%19%19%11%
1882
December1st to 15thDay
34%7%15%20%16%5%
1755
16th to endDay
29%7%14%26%17%5%
1872
January1st to 15thNight
36%7%13%24%14%3
2522
16th to endNight
34%7%10%21%19%6%
2435
February1st to 15thNight
34%6%7%18%20%12%
2112
16th to endNight
27%7%12%23%20%8%
1848
March1st to 15thNight
23%6%12%29%22%6%
1980
16th to endNight
25%7%13%24%22%7%
2112
April1st to 15thNight
22%6%18%28%18%5%
1976
16th to endNight
27%7%12%22%26%4
1896
May1st to 15thNight
20%8%13%30%21%6%
1644
16th to endNight
29%8%17%26%16%
1684
June1st to 15thNight
41%11%22%18%5%
1620
16th to endNight
36%17%26%14%4
1620
July1st to 15thNight
43%17%29%7%1
1530
16th to endNight
35%19%30%14%
1595
August1st to 15thNight
38%15%35%10%
1701
16th to endNight
43%16%27%11%
2048
September1st to 15thNight
43%16%24%13%2
1980
16th to endNight
45%14%21%13%4
1980
October1st to 15thNight
31%10%15%16%19%5%
2007
16th to endNight
36%5%11%15%20%9%
2304
November1st to 15thNight
28%5%9%24%23%8%
2281
16th to endNight
28%7%11%21%19%10%
2405
December1st to 15thNight
33%6%12%25%16%5%
2535
16th to endNight
28%6%15%24%19%5%
2704

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
17%228%31%13%7%
135
16th to endDay
10%8%31%29%18%2
109
February1st to 15thDay
7%5%24%30%25%6%
90
16th to endDay
5%7%25%37%23%
126
March1st to 15thDay
414%16%40%20%4
270
16th to endDay
7%12%17%33%25%4
288
April1st to 15thDay
311%14%35%30%4
270
16th to endDay
8%12%5%30%38%5%
270
May1st to 15thDay
310%8%24%37%15%
288
16th to endDay
6%10%215%35%29%
331
June1st to 15thDay
15%9%5%11%25%33%
315
16th to endDay
5%9%25%24%52%
315
July1st to 15thDay
8%7%318%61%
305
16th to endDay
7%9%19%22%49%
326
August1st to 15thDay
6%5%26%22%56%
313
16th to endDay
12%5%37%25%46%
332
September1st to 15thDay
9%6%47%26%44%
315
16th to endDay
8%5%39%40%32%
314
October1st to 15thDay
6%6%7%25%39%15%
315
16th to endDay
12%7%10%31%27%11%
336
November1st to 15thDay
5%8%6%30%35%12%
325
16th to endDay
6%8%10%30%35%8%
262
December1st to 15thDay
9%416%40%25%4
135
16th to endDay
49%27%40%18%
144
January1st to 15thNight
9%18%17%32%20%1
780
16th to endNight
10%19%18%34%16%
788
February1st to 15thNight
9%18%18%35%17%
704
16th to endNight
9%16%18%34%20%
631
March1st to 15thNight
418%18%35%21%1
720
16th to endNight
5%18%15%36%22%2
768
April1st to 15thNight
417%12%38%25%1
718
16th to endNight
6%17%11%34%27%
720
May1st to 15thNight
217%6%36%33%3
564
16th to endNight
417%420%45%8%
563
June1st to 15thNight
8%17%212%38%20%
540
16th to endNight
5%16%36%30%37%
540
July1st to 15thNight
6%12%1333%42%
510
16th to endNight
416%25%27%43%
564
August1st to 15thNight
7%9%2432%43%
539
16th to endNight
11%8%49%32%34%
711
September1st to 15thNight
9%8%310%40%27%
720
16th to endNight
13%8%5%13%38%19%
717
October1st to 15thNight
8%8%7%28%37%9%
720
16th to endNight
11%10%13%31%28%4
768
November1st to 15thNight
6%13%13%38%23%3
760
16th to endNight
6%16%14%35%25%2
780
December1st to 15thNight
7%17%13%31%27%2
780
16th to endNight
5%16%12%32%30%3
832
Page generated at 2018-01-21 12:19:28. Version ac04

Copyright 2018 A. Danko


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