Beauclerc / San Jose(FL)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Beauclerc / San Jose(FL) clear sky chart from 2005-11-05 to

2017-09-12
.

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
54%
15866
21%
46862
15%
15827
61%
15827
29%
29372

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
35%
718
21%
2327
12%
716
47%
716
22%
1448
January16th to endNight
38%
768
22%
2496
14%
768
49%
768
25%
1529
February1st to 15thNight
38%
701
23%
2108
14%
700
49%
700
29%
1279
February16th to endNight
35%
631
24%
1843
12%
631
47%
631
28%
1149
March1st to 15thNight
44%
720
28%
1980
15%
720
55%
720
37%
1159
March16th to endNight
47%
768
24%
2112
15%
768
55%
768
36%
1233
April1st to 15thNight
48%
718
24%
1976
16%
718
55%
718
36%
1172
April16th to endNight
54%
711
28%
1806
17%
711
60%
711
42%
1063
May1st to 15thNight
64%
539
25%
1619
18%
539
69%
539
41%
898
May16th to endNight
69%
561
22%
1682
18%
561
71%
561
36%
972
June1st to 15thNight
66%
540
14%
1620
12%
540
67%
540
27%
1045
June16th to endNight
73%
540
11%
1620
9%
540
74%
540
26%
1094
July1st to 15thNight
73%
510
11%
1530
10%
510
73%
510
25%
1030
July16th to endNight
76%
564
12%
1595
12%
531
78%
531
25%
1077
August1st to 15thNight
76%
539
10%
1609
9%
536
77%
536
24%
1098
August16th to endNight
66%
702
12%
1968
12%
702
67%
702
21%
1403
September1st to 15thNight
65%
707
11%
1944
10%
707
65%
707
20%
1441
September16th to endNight
58%
657
13%
1815
12%
657
59%
657
21%
1334
October1st to 15thNight
62%
660
26%
1892
24%
660
66%
660
32%
1165
October16th to endNight
59%
704
29%
2112
26%
704
66%
704
33%
1222
November1st to 15thNight
52%
700
28%
2101
21%
700
62%
700
33%
1238
November16th to endNight
45%
720
27%
2271
19%
720
57%
720
30%
1333
December1st to 15thNight
44%
720
24%
2340
19%
720
53%
720
26%
1441
December16th to endNight
47%
768
23%
2496
19%
768
55%
768
24%
1549

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
10%5%26%6%36%5%6%8%37%
47782
Night
9%5%25%5%35%5%6%8%44%
47066
TransparencyDay
41%7%13%17%13%5%
47483
Night
35%7%15%20%14%6%
46869
SeeingDay
10%415%23%26%18%
5715
Night
11%6%19%30%26%5%
15874

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
12%7%46%5%2445%6%41%
1611
16th to endDay
13%6%35%5%2345%5%45%
1728
February1st to 15thDay
14%6%345%2333446%
1747
16th to endDay
11%5%35%5%2435%5%48%
1628
March1st to 15thDay
8%5%24323447%52%
1980
16th to endDay
9%5%25%5%24446%48%
2111
April1st to 15thDay
9%425%5%25%46%8%46%
1972
16th to endDay
6%424425%5%7%8%48%
2160
May1st to 15thDay
8%314435%5%5%8%48%
2331
16th to endDay
8%4147%47%7%6%9%38%
2431
June1st to 15thDay
10%426%8%5%8%6%7%9%30%
2340
16th to endDay
7%5%36%7%37%7%8%10%29%
2340
July1st to 15thDay
8%6%27%6%5%7%7%8%11%27%
2340
16th to endDay
7%5%48%8%5%8%8%7%10%24%
2465
August1st to 15thDay
10%6%28%7%5%9%8%8%11%21%
2340
16th to endDay
11%7%37%8%5%8%7%8%10%21%
2218
September1st to 15thDay
11%7%37%7%6%7%8%7%9%22%
1936
16th to endDay
18%7%48%8%45%5%5%8%21%
1815
October1st to 15thDay
11%7%36%6%45%5%7%6%36%
1738
16th to endDay
10%6%345%14346%49%
1760
November1st to 15thDay
9%6%25%425%45%7%45%
1757
16th to endDay
10%425%5%3435%7%44%
1686
December1st to 15thDay
13%6%26%5%245%6%7%39%
1620
16th to endDay
11%6%344245%5%9%42%
1728
January1st to 15thNight
11%7%35%424446%43%
2327
16th to endNight
14%6%25%314446%45%
2496
February1st to 15thNight
13%5%25%423335%50%
2103
16th to endNight
10%5%36%433445%47%
1843
March1st to 15thNight
7%415%33445%7%52%
1980
16th to endNight
8%324423446%55%
2112
April1st to 15thNight
7%5%23423448%52%
1976
16th to endNight
6%31342347%7%54%
1806
May1st to 15thNight
5%2144245%6%9%55%
1619
16th to endNight
6%3245%2447%11%47%
1682
June1st to 15thNight
9%3145%35%5%8%12%36%
1620
16th to endNight
7%4145%46%6%8%13%36%
1620
July1st to 15thNight
6%425%5%46%6%7%13%37%
1620
16th to endNight
5%326%6%47%8%9%11%35%
1703
August1st to 15thNight
4326%6%46%9%10%14%32%
1620
16th to endNight
8%5%26%6%46%6%7%12%32%
1968
September1st to 15thNight
10%5%25%7%5%7%7%8%10%28%
1944
16th to endNight
12%7%35%6%37%6%8%11%26%
1815
October1st to 15thNight
10%4245%245%48%46%
1892
16th to endNight
8%4245%34446%51%
2112
November1st to 15thNight
8%5%14424448%49%
2101
16th to endNight
9%424435%447%49%
2271
December1st to 15thNight
12%6%25%425%35%7%44%
2340
16th to endNight
10%6%36%5%35%35%7%43%
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
43%48%17%17%8%
1612
16th to endDay
40%38%17%19%9%
1728
February1st to 15thDay
41%46%12%21%14%
1749
16th to endDay
37%410%15%19%12%
1628
March1st to 15thDay
30%411%24%21%8%
1980
16th to endDay
36%5%10%18%20%8%
2112
April1st to 15thDay
34%5%9%20%22%8%
1972
16th to endDay
30%6%11%23%19%8%
2160
May1st to 15thDay
32%6%11%23%18%7%
2331
16th to endDay
39%7%14%20%14%4
2435
June1st to 15thDay
44%10%18%17%7%
2340
16th to endDay
44%12%21%15%5%
2340
July1st to 15thDay
44%11%25%16%2
2201
16th to endDay
47%12%21%15%2
2310
August1st to 15thDay
49%14%22%11%1
2327
16th to endDay
52%13%17%13%2
2218
September1st to 15thDay
52%12%16%13%6%
1936
16th to endDay
59%7%11%12%7%1
1815
October1st to 15thDay
45%6%7%15%15%9%
1738
16th to endDay
37%46%17%22%11%
1760
November1st to 15thDay
36%411%18%19%8%
1757
16th to endDay
39%48%16%20%11%
1686
December1st to 15thDay
42%410%21%14%5%
1620
16th to endDay
38%5%11%23%12%7%
1728
January1st to 15thNight
40%49%19%16%8%
2327
16th to endNight
39%49%16%20%10%
2496
February1st to 15thNight
36%38%16%18%15%
2112
16th to endNight
38%39%17%19%10%
1843
March1st to 15thNight
30%412%25%18%8%
1980
16th to endNight
30%413%21%19%10%
2112
April1st to 15thNight
30%6%9%22%20%10%
1976
16th to endNight
25%6%16%24%21%6%
1806
May1st to 15thNight
24%7%16%25%19%6%
1620
16th to endNight
29%6%19%26%15%2
1684
June1st to 15thNight
36%10%23%24%6%
1620
16th to endNight
35%13%23%20%5%
1620
July1st to 15thNight
36%14%27%20%1
1530
16th to endNight
33%16%27%20%2
1595
August1st to 15thNight
34%17%31%15%1
1609
16th to endNight
42%13%24%17%2
1968
September1st to 15thNight
45%13%18%14%6%
1944
16th to endNight
47%10%16%15%7%2
1815
October1st to 15thNight
36%5%12%17%19%8%
1892
16th to endNight
32%5%9%20%21%12%
2112
November1st to 15thNight
33%410%22%19%9%
2101
16th to endNight
34%49%19%18%13%
2271
December1st to 15thNight
38%5%12%22%14%6%
2340
16th to endNight
40%412%21%12%8%
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
21%8%28%21%14%5%
90
16th to endDay
12%12%38%26%9%1
96
February1st to 15thDay
12%22%27%16%18%2
90
16th to endDay
10%10%38%30%9%
129
March1st to 15thDay
11%8%28%32%16%2
270
16th to endDay
12%5%25%27%24%4
288
April1st to 15thDay
11%10%24%27%20%6%
270
16th to endDay
5%422%25%25%15%
270
May1st to 15thDay
9%420%29%23%12%
288
16th to endDay
7%29%24%33%22%
331
June1st to 15thDay
12%27%20%30%26%
315
16th to endDay
7%5%19%32%34%
315
July1st to 15thDay
4215%32%43%
305
16th to endDay
7%1417%36%31%
326
August1st to 15thDay
8%18%16%35%29%
313
16th to endDay
13%6%15%28%37%
332
September1st to 15thDay
16%25%15%31%29%
299
16th to endDay
23%27%12%27%26%
254
October1st to 15thDay
11%5%14%29%29%8%
255
16th to endDay
9%5%18%29%29%8%
272
November1st to 15thDay
10%6%20%34%22%6%
265
16th to endDay
13%5%30%24%19%7%
156
December1st to 15thDay
12%431%38%12%1
90
16th to endDay
13%323%33%17%8%
96
January1st to 15thNight
14%15%28%28%11%1
720
16th to endNight
17%11%28%31%10%
768
February1st to 15thNight
14%11%29%34%8%1
704
16th to endNight
13%11%33%33%7%
631
March1st to 15thNight
10%10%30%37%10%
720
16th to endNight
10%7%28%34%17%1
768
April1st to 15thNight
10%6%28%36%16%
718
16th to endNight
8%6%24%38%20%1
711
May1st to 15thNight
6%221%42%25%1
540
16th to endNight
7%211%31%37%9%
563
June1st to 15thNight
11%27%29%39%9%
540
16th to endNight
8%15%25%43%15%
540
July1st to 15thNight
9%420%46%18%
510
16th to endNight
6%220%54%15%
564
August1st to 15thNight
5%5%20%52%16%
539
16th to endNight
11%16%21%40%18%
702
September1st to 15thNight
13%15%24%41%13%
707
16th to endNight
16%110%25%35%10%
657
October1st to 15thNight
13%114%31%35%3
660
16th to endNight
9%6%15%36%28%2
704
November1st to 15thNight
10%6%25%33%22%2
700
16th to endNight
10%9%29%28%19%2
720
December1st to 15thNight
14%8%26%26%21%1
720
16th to endNight
12%10%23%33%18%1
768
Page generated at 2017-09-13 07:39:03. Version ac04

Copyright 2017 A. Danko


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