Batesburg-Leesville High School
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Batesburg-Leesville High School 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
47%
16266
23%
48460
15%
16226
56%
16226
28%
30211

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
31%
778
22%
2522
9%
776
47%
776
24%
1533
January16th to endNight
26%
788
26%
2560
13%
788
43%
788
23%
1567
February1st to 15thNight
29%
703
24%
2196
10%
701
46%
701
26%
1334
February16th to endNight
27%
631
26%
1874
10%
631
44%
631
28%
1136
March1st to 15thNight
31%
720
26%
1980
12%
720
43%
720
30%
1238
March16th to endNight
36%
768
21%
2112
10%
768
45%
768
29%
1361
April1st to 15thNight
38%
718
24%
1951
12%
718
48%
718
34%
1181
April16th to endNight
46%
630
26%
1710
14%
630
54%
630
34%
1040
May1st to 15thNight
46%
539
19%
1620
10%
539
53%
539
29%
1006
May16th to endNight
60%
561
18%
1683
13%
561
63%
561
30%
1050
June1st to 15thNight
60%
540
15%
1620
12%
540
61%
540
26%
1066
June16th to endNight
69%
540
15%
1620
13%
540
70%
540
27%
1050
July1st to 15thNight
66%
510
11%
1530
9%
510
66%
510
24%
1031
July16th to endNight
68%
564
12%
1595
10%
531
70%
531
25%
1062
August1st to 15thNight
69%
539
15%
1609
15%
536
69%
536
23%
1120
August16th to endNight
64%
660
15%
1845
12%
660
64%
660
24%
1297
September1st to 15thNight
66%
720
19%
1980
16%
720
68%
720
29%
1289
September16th to endNight
57%
717
20%
1980
17%
717
60%
717
27%
1332
October1st to 15thNight
53%
720
29%
2088
25%
720
59%
720
34%
1249
October16th to endNight
53%
768
36%
2304
27%
768
67%
768
39%
1262
November1st to 15thNight
52%
760
30%
2307
23%
760
62%
760
37%
1283
November16th to endNight
42%
780
28%
2535
21%
780
54%
780
31%
1438
December1st to 15thNight
42%
780
24%
2535
16%
780
54%
780
26%
1537
December16th to endNight
34%
832
22%
2704
15%
832
44%
832
21%
1749

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%25%5%35%5%5%7%42%
49065
Night
11%5%25%42445%7%45%
48658
TransparencyDay
38%6%11%19%17%5%
48766
Night
36%6%11%19%18%7%
48461
SeeingDay
14%6%20%25%21%10%
6046
Night
14%7%24%31%19%2
16272

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
15%6%34424435%45%
1746
16th to endDay
16%6%24413335%47%
1768
February1st to 15thDay
16%42442435%5%46%
1666
16th to endDay
16%5%24323335%48%
1598
March1st to 15thDay
13%424423346%50%
1980
16th to endDay
15%5%245%24445%44%
2111
April1st to 15thDay
10%42342445%6%49%
1996
16th to endDay
10%423325%5%6%8%45%
2259
May1st to 15thDay
9%5%245%35%46%7%43%
2331
16th to endDay
10%5%25%5%45%5%6%8%38%
2431
June1st to 15thDay
10%425%6%35%6%7%9%37%
2340
16th to endDay
4425%437%6%9%12%39%
2340
July1st to 15thDay
7%6%36%7%5%6%6%7%10%32%
2340
16th to endDay
6%426%6%47%8%8%12%31%
2465
August1st to 15thDay
10%5%26%6%47%6%6%9%31%
2340
16th to endDay
13%5%26%7%46%6%8%9%29%
2342
September1st to 15thDay
9%6%25%6%35%5%5%8%42%
1980
16th to endDay
15%7%25%4235%5%6%40%
1980
October1st to 15thDay
15%5%13322235%52%
1872
16th to endDay
10%5%1341322360%
1920
November1st to 15thDay
12%5%14213345%54%
1878
16th to endDay
12%5%2442343451%
1755
December1st to 15thDay
16%7%24434445%41%
1755
16th to endDay
20%6%24424447%39%
1872
January1st to 15thNight
13%5%35%324345%47%
2522
16th to endNight
16%6%24323335%47%
2560
February1st to 15thNight
16%423424345%48%
2187
16th to endNight
13%5%24423345%49%
1874
March1st to 15thNight
12%4244245%47%47%
1980
16th to endNight
12%425%324446%47%
2112
April1st to 15thNight
11%414324347%52%
1951
16th to endNight
8%325%5%245%5%7%50%
1710
May1st to 15thNight
8%425%435%5%6%9%42%
1619
16th to endNight
8%3145%45%6%7%10%42%
1682
June1st to 15thNight
10%435%5%35%6%6%12%34%
1620
16th to endNight
4415%6%46%7%9%11%37%
1620
July1st to 15thNight
7%436%7%47%7%7%12%31%
1620
16th to endNight
5%5%26%5%36%8%9%12%34%
1703
August1st to 15thNight
8%5%25%6%37%6%9%12%32%
1620
16th to endNight
11%6%35%5%45%5%6%11%33%
1845
September1st to 15thNight
9%5%245%346%7%9%41%
1980
16th to endNight
14%6%25%5%24446%41%
1980
October1st to 15thNight
14%5%14323346%52%
2088
16th to endNight
8%424323335%58%
2304
November1st to 15thNight
11%413322345%57%
2307
16th to endNight
12%424313446%50%
2535
December1st to 15thNight
14%6%24423346%47%
2535
16th to endNight
17%6%25%32435%6%40%
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
40%48%15%23%6%
1747
16th to endDay
39%36%19%23%8%
1768
February1st to 15thDay
39%37%20%23%5%
1668
16th to endDay
39%35%21%22%6%
1598
March1st to 15thDay
35%38%22%20%9%
1980
16th to endDay
40%410%19%19%4
2112
April1st to 15thDay
33%5%10%20%24%5%
1996
16th to endDay
33%6%10%20%21%7%
2259
May1st to 15thDay
37%6%14%19%19%2
2331
16th to endDay
39%9%14%22%12%1
2435
June1st to 15thDay
39%9%16%23%10%
2340
16th to endDay
32%12%16%23%13%1
2340
July1st to 15thDay
42%10%17%18%7%3
2201
16th to endDay
37%13%18%20%7%1
2310
August1st to 15thDay
44%10%14%18%10%1
2327
16th to endDay
46%10%16%16%9%1
2342
September1st to 15thDay
37%8%13%18%17%3
1980
16th to endDay
42%7%9%18%16%5%
1980
October1st to 15thDay
35%38%20%24%8%
1872
16th to endDay
30%3319%30%12%
1920
November1st to 15thDay
32%36%20%25%11%
1878
16th to endDay
34%48%17%23%10%
1755
December1st to 15thDay
44%49%17%18%6%
1755
16th to endDay
43%49%19%16%6%
1872
January1st to 15thNight
39%38%15%25%7%
2522
16th to endNight
40%3418%21%11%
2560
February1st to 15thNight
38%36%19%21%9%
2196
16th to endNight
36%38%20%22%8%
1874
March1st to 15thNight
36%49%18%21%8%
1980
16th to endNight
37%6%10%19%19%6%
2112
April1st to 15thNight
33%49%22%22%8%
1951
16th to endNight
32%6%9%21%22%9%
1710
May1st to 15thNight
35%8%14%20%17%3
1620
16th to endNight
33%9%15%24%15%1
1684
June1st to 15thNight
39%9%16%23%10%
1620
16th to endNight
34%12%15%22%12%2
1620
July1st to 15thNight
40%10%20%16%8%3
1530
16th to endNight
36%13%22%17%8%1
1595
August1st to 15thNight
40%13%16%19%9%1
1609
16th to endNight
42%10%19%18%8%
1845
September1st to 15thNight
36%9%15%19%14%5%
1980
16th to endNight
42%6%12%18%16%4
1980
October1st to 15thNight
34%410%18%25%7%
2088
16th to endNight
28%35%20%27%14%
2304
November1st to 15thNight
30%37%18%27%13%
2307
16th to endNight
33%38%16%24%13%
2535
December1st to 15thNight
38%310%18%20%7%
2535
16th to endNight
44%49%18%16%7%
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
18%17%40%22%1
135
16th to endDay
15%30%37%14%1
109
February1st to 15thDay
13%26%51%8%
90
16th to endDay
15%18%40%22%4
99
March1st to 15thDay
14%15%33%27%9%
270
16th to endDay
14%12%35%23%14%
288
April1st to 15thDay
15%14%27%19%21%2
270
16th to endDay
11%329%26%23%5%
270
May1st to 15thDay
12%10%27%29%14%6%
288
16th to endDay
14%414%23%24%17%
331
June1st to 15thDay
13%210%25%30%17%
315
16th to endDay
8%113%29%26%21%
315
July1st to 15thDay
8%8%28%34%19%
305
16th to endDay
7%8%25%37%20%
326
August1st to 15thDay
16%110%22%33%15%
313
16th to endDay
15%29%22%26%23%
332
September1st to 15thDay
13%212%24%32%13%
315
16th to endDay
21%115%25%24%11%
314
October1st to 15thDay
19%316%33%17%8%
315
16th to endDay
11%6%22%26%24%7%
336
November1st to 15thDay
19%6%22%29%14%7%
296
16th to endDay
6%11%29%30%20%2
135
December1st to 15thDay
27%12%31%20%7%
135
16th to endDay
27%18%36%13%4
144
January1st to 15thNight
17%13%33%27%8%
780
16th to endNight
18%15%35%25%4
788
February1st to 15thNight
18%14%34%29%3
704
16th to endNight
15%13%38%27%3
631
March1st to 15thNight
15%11%38%28%6%
720
16th to endNight
14%10%34%29%10%
768
April1st to 15thNight
14%12%33%27%12%
718
16th to endNight
11%8%28%35%15%
630
May1st to 15thNight
11%431%35%15%1
540
16th to endNight
9%218%37%27%4
563
June1st to 15thNight
12%115%34%29%6%
540
16th to endNight
6%112%39%30%10%
540
July1st to 15thNight
9%8%40%32%8%
510
16th to endNight
6%18%35%41%7%
564
August1st to 15thNight
11%6%32%41%7%
539
16th to endNight
15%8%30%40%5%
660
September1st to 15thNight
11%110%32%38%5%
720
16th to endNight
17%114%32%29%5%
717
October1st to 15thNight
18%319%28%25%4
720
16th to endNight
10%6%26%30%23%3
768
November1st to 15thNight
14%5%24%32%19%3
760
16th to endNight
14%8%30%27%18%1
780
December1st to 15thNight
17%8%25%33%12%1
780
16th to endNight
21%12%28%29%7%
832
Page generated at 2018-01-21 12:19:21. Version ac04

Copyright 2018 A. Danko


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