Fort Boggy State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fort Boggy State Park clear sky chart from 2005-11-05 to 2017-09-21.

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
51%
15483
26%
46950
19%
15435
59%
15435
35%
26869

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
36%
898
26%
2327
11%
895
45%
895
31%
1480
January16th to endNight
33%
960
29%
2496
11%
960
43%
960
33%
1586
February1st to 15thNight
31%
773
25%
2173
10%
766
41%
766
27%
1361
February16th to endNight
25%
563
29%
1825
10%
563
41%
563
27%
1075
March1st to 15thNight
31%
540
26%
1980
14%
540
45%
540
24%
1187
March16th to endNight
35%
576
23%
2112
15%
576
48%
576
27%
1179
April1st to 15thNight
33%
539
24%
1956
13%
539
49%
539
29%
1076
April16th to endNight
37%
540
24%
1800
15%
540
51%
540
30%
1033
May1st to 15thNight
35%
539
21%
1630
14%
539
47%
539
30%
978
May16th to endNight
60%
563
27%
1685
25%
561
69%
561
42%
913
June1st to 15thNight
77%
540
22%
1620
24%
540
80%
540
49%
805
June16th to endNight
77%
540
22%
1620
26%
540
79%
540
42%
877
July1st to 15thNight
80%
510
23%
1530
27%
510
82%
510
46%
800
July16th to endNight
84%
564
22%
1594
26%
531
86%
531
44%
853
August1st to 15thNight
87%
539
31%
1610
36%
536
87%
536
54%
769
August16th to endNight
74%
573
20%
1911
24%
573
75%
573
29%
1138
September1st to 15thNight
76%
540
20%
1980
24%
540
76%
540
32%
1084
September16th to endNight
72%
510
31%
1881
34%
510
75%
510
35%
979
October1st to 15thNight
67%
588
34%
1908
29%
588
71%
588
43%
959
October16th to endNight
58%
704
37%
2112
24%
704
66%
704
47%
1064
November1st to 15thNight
51%
700
29%
2100
19%
700
57%
700
37%
1179
November16th to endNight
45%
824
32%
2264
18%
824
53%
824
36%
1331
December1st to 15thNight
37%
900
27%
2340
14%
900
44%
900
30%
1534
December16th to endNight
36%
960
24%
2496
10%
960
44%
960
30%
1629

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
12%5%2443445%7%45%
47902
Night
11%423323347%52%
47153
TransparencyDay
37%5%11%20%18%7%
47602
Night
31%411%21%19%10%
46958
SeeingDay
11%415%26%30%11%
5487
Night
13%6%24%33%20%2
15486

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
16%7%2431233450%
1611
16th to endDay
18%5%24313336%48%
1728
February1st to 15thDay
16%5%35%323235%46%
1693
16th to endDay
19%5%24423335%46%
1648
March1st to 15thDay
22%6%35%32433440%
1980
16th to endDay
16%6%34423345%43%
2110
April1st to 15thDay
12%6%35%43446%6%41%
1992
16th to endDay
13%5%24435%45%6%42%
2160
May1st to 15thDay
14%5%35%5%345%5%7%38%
2317
16th to endDay
10%5%35%6%36%6%6%9%37%
2430
June1st to 15thDay
5%3145%36%5%6%11%44%
2340
16th to endDay
6%3346%46%6%8%11%37%
2340
July1st to 15thDay
7%4245%37%6%7%10%40%
2340
16th to endDay
6%325%6%46%7%7%10%39%
2466
August1st to 15thDay
5%112325%5%6%10%55%
2340
16th to endDay
8%425%7%37%7%7%7%37%
2287
September1st to 15thDay
9%425%5%4445%7%45%
1980
16th to endDay
7%31333446%9%49%
1871
October1st to 15thDay
11%323324336%53%
1708
16th to endDay
11%3221223464%
1760
November1st to 15thDay
10%5%24433446%50%
1758
16th to endDay
15%42432333352%
1695
December1st to 15thDay
18%8%24322335%44%
1620
16th to endDay
18%7%35%433345%39%
1728
January1st to 15thNight
17%5%24213335%50%
2327
16th to endNight
18%423322245%50%
2496
February1st to 15thNight
15%6%25%42222450%
2171
16th to endNight
17%424322335%50%
1825
March1st to 15thNight
17%5%25%422346%45%
1980
16th to endNight
11%5%3442335%6%51%
2112
April1st to 15thNight
8%424424448%50%
1956
16th to endNight
13%42442335%7%49%
1800
May1st to 15thNight
10%5%35%32436%9%46%
1629
16th to endNight
5%3133235%6%12%52%
1683
June1st to 15thNight
311231435%9%62%
1620
16th to endNight
331332446%11%53%
1620
July1st to 15thNight
421242445%12%55%
1620
16th to endNight
31133245%7%13%51%
1702
August1st to 15thNight
22222336%12%61%
1620
16th to endNight
6%4246%25%6%7%11%42%
1911
September1st to 15thNight
8%4144235%6%8%49%
1980
16th to endNight
7%42432435%7%54%
1881
October1st to 15thNight
8%213213336%62%
1908
16th to endNight
9%21221222466%
2112
November1st to 15thNight
9%423323346%55%
2100
16th to endNight
15%5%1331224355%
2264
December1st to 15thNight
16%6%25%323335%46%
2340
16th to endNight
16%7%24313336%45%
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
40%16%17%23%11%
1612
16th to endDay
39%26%15%23%11%
1728
February1st to 15thDay
41%35%17%21%10%
1694
16th to endDay
41%26%16%20%12%
1648
March1st to 15thDay
47%36%14%21%7%
1980
16th to endDay
43%37%16%23%5%
2112
April1st to 15thDay
41%48%19%15%10%
1992
16th to endDay
41%410%15%20%7%
2160
May1st to 15thDay
43%5%10%16%15%6%
2317
16th to endDay
40%7%12%20%17%1
2434
June1st to 15thDay
30%6%13%30%15%2
2340
16th to endDay
36%8%15%23%14%2
2340
July1st to 15thDay
33%8%18%27%11%
2201
16th to endDay
35%8%20%25%9%
2311
August1st to 15thDay
22%7%18%35%14%1
2326
16th to endDay
39%9%15%23%9%2
2287
September1st to 15thDay
35%5%15%23%12%7%
1980
16th to endDay
29%6%11%22%19%9%
1871
October1st to 15thDay
32%310%19%16%17%
1708
16th to endDay
25%2414%35%16%
1760
November1st to 15thDay
35%39%21%20%9%
1758
16th to endDay
37%25%14%25%15%
1695
December1st to 15thDay
43%38%19%17%8%
1620
16th to endDay
46%38%17%17%7%
1728
January1st to 15thNight
38%25%16%21%14%
2327
16th to endNight
38%25%14%23%15%
2496
February1st to 15thNight
39%2414%21%16%
2181
16th to endNight
37%36%16%18%17%
1825
March1st to 15thNight
40%37%15%22%10%
1980
16th to endNight
34%412%17%23%8%
2112
April1st to 15thNight
32%5%9%21%18%12%
1956
16th to endNight
34%411%19%20%10%
1800
May1st to 15thNight
35%413%19%17%8%
1630
16th to endNight
24%5%18%29%17%3
1685
June1st to 15thNight
18%6%15%32%23%2
1620
16th to endNight
25%6%18%30%17%2
1620
July1st to 15thNight
22%5%22%34%14%
1530
16th to endNight
20%9%27%32%9%
1594
August1st to 15thNight
15%5%21%36%18%2
1610
16th to endNight
33%8%19%29%6%2
1911
September1st to 15thNight
30%6%18%23%14%6%
1980
16th to endNight
28%5%11%22%21%10%
1881
October1st to 15thNight
24%39%24%20%17%
1908
16th to endNight
23%2418%27%22%
2112
November1st to 15thNight
30%39%21%23%10%
2100
16th to endNight
33%26%14%25%17%
2264
December1st to 15thNight
41%37%19%19%9%
2340
16th to endNight
41%26%17%20%10%
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
23%11%27%30%6%1
90
16th to endDay
19%11%43%15%9%
96
February1st to 15thDay
11%18%40%23%6%
90
16th to endDay
18%14%39%20%6%
81
March1st to 15thDay
28%15%28%16%10%
90
16th to endDay
11%8%37%25%17%
96
April1st to 15thDay
13%12%31%23%18%
111
16th to endDay
19%6%28%27%16%1
270
May1st to 15thDay
14%9%31%29%12%2
454
16th to endDay
12%5%22%31%23%3
517
June1st to 15thDay
7%19%35%36%10%
495
16th to endDay
7%17%30%37%14%
495
July1st to 15thDay
6%5%30%40%16%
475
16th to endDay
5%319%48%23%
515
August1st to 15thDay
8%20%51%19%
493
16th to endDay
16%319%39%20%
327
September1st to 15thDay
2216%41%36%
135
16th to endDay
4221%42%27%
105
October1st to 15thDay
212%36%40%8%
90
16th to endDay
18%5%12%18%34%10%
96
November1st to 15thDay
17%5%24%32%16%3
90
16th to endDay
21%6%25%31%10%5%
90
December1st to 15thDay
27%424%22%11%10%
90
16th to endDay
22%16%32%21%6%
96
January1st to 15thNight
20%10%29%29%9%
900
16th to endNight
19%10%33%29%6%
960
February1st to 15thNight
19%12%32%30%4
773
16th to endNight
21%10%40%24%3
563
March1st to 15thNight
19%8%38%26%6%
540
16th to endNight
12%11%37%30%7%
576
April1st to 15thNight
8%9%44%28%8%
539
16th to endNight
15%7%37%26%12%1
540
May1st to 15thNight
12%7%38%32%7%
540
16th to endNight
6%225%42%20%1
563
June1st to 15thNight
410%50%31%3
540
16th to endNight
49%44%35%6%
540
July1st to 15thNight
416%47%34%6%
510
16th to endNight
32235%49%6%
564
August1st to 15thNight
4140%46%6%
539
16th to endNight
7%5%36%41%8%
573
September1st to 15thNight
10%5%33%46%4
540
16th to endNight
9%9%30%42%7%
510
October1st to 15thNight
9%215%38%28%5%
588
16th to endNight
10%422%33%25%3
704
November1st to 15thNight
12%5%27%32%22%1
700
16th to endNight
17%7%25%31%16%1
824
December1st to 15thNight
19%6%31%30%11%
900
16th to endNight
20%8%30%31%9%
960
Page generated at 2017-09-22 06:35:29. Version ac04

Copyright 2017 A. Danko


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