Newberry Star Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Newberry Star Park clear sky chart from 2005-11-05 to 2017-09-19.

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%
15796
21%
46967
17%
15756
63%
15756
30%
29169

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
42%
718
20%
2327
13%
716
50%
716
24%
1435
January16th to endNight
39%
768
23%
2430
16%
768
49%
768
25%
1527
February1st to 15thNight
45%
701
25%
2108
16%
699
55%
699
31%
1269
February16th to endNight
40%
631
24%
1884
14%
631
51%
631
29%
1159
March1st to 15thNight
46%
720
28%
1980
16%
720
56%
720
37%
1168
March16th to endNight
50%
768
25%
2112
15%
768
57%
768
37%
1241
April1st to 15thNight
50%
718
23%
1976
15%
718
56%
718
37%
1178
April16th to endNight
58%
651
28%
1798
18%
651
64%
651
41%
1018
May1st to 15thNight
66%
539
26%
1619
20%
539
72%
539
42%
883
May16th to endNight
73%
561
23%
1682
18%
561
75%
561
39%
942
June1st to 15thNight
69%
540
14%
1620
12%
540
70%
540
26%
1077
June16th to endNight
77%
540
11%
1620
9%
540
78%
540
28%
1074
July1st to 15thNight
78%
510
10%
1530
9%
510
78%
510
24%
1047
July16th to endNight
77%
564
8%
1595
8%
531
79%
531
22%
1127
August1st to 15thNight
78%
539
7%
1635
7%
536
78%
536
23%
1152
August16th to endNight
67%
663
11%
2000
12%
663
67%
663
21%
1410
September1st to 15thNight
64%
720
10%
1980
10%
720
64%
720
20%
1448
September16th to endNight
62%
673
17%
1858
16%
673
64%
673
22%
1314
October1st to 15thNight
67%
660
27%
1851
25%
660
70%
660
35%
1128
October16th to endNight
61%
704
30%
2112
27%
704
67%
704
35%
1217
November1st to 15thNight
58%
700
30%
2101
26%
700
65%
700
40%
1151
November16th to endNight
51%
720
28%
2313
21%
720
63%
720
33%
1304
December1st to 15thNight
50%
720
27%
2340
24%
720
57%
720
30%
1385
December16th to endNight
50%
768
23%
2496
20%
768
57%
768
27%
1515

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
9%5%25%6%46%5%6%8%38%
47834
Night
8%425%4345%6%9%45%
47171
TransparencyDay
40%9%13%16%13%6%
47535
Night
34%8%15%18%15%7%
46974
SeeingDay
10%313%21%26%25%
5662
Night
10%419%33%26%6%
15804

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%6%26%43345%7%43%
1611
16th to endDay
13%5%35%5%2335%6%45%
1792
February1st to 15thDay
16%5%24423445%47%
1750
16th to endDay
11%6%2443435%5%49%
1589
March1st to 15thDay
8%31431435%8%53%
1980
16th to endDay
7%5%2443345%7%50%
2111
April1st to 15thDay
8%3245%25%46%9%47%
1972
16th to endDay
6%3145%45%5%5%8%49%
2169
May1st to 15thDay
5%323435%5%6%8%50%
2331
16th to endDay
6%425%7%47%5%6%8%41%
2431
June1st to 15thDay
8%5%36%7%5%9%7%7%10%28%
2340
16th to endDay
7%436%8%5%8%8%8%11%27%
2340
July1st to 15thDay
7%5%37%7%5%9%8%8%12%24%
2340
16th to endDay
8%5%38%10%7%10%7%7%9%22%
2465
August1st to 15thDay
10%6%27%8%6%9%9%9%12%18%
2310
16th to endDay
10%6%38%8%5%8%8%8%9%22%
2187
September1st to 15thDay
10%6%38%8%5%8%6%7%9%23%
1980
16th to endDay
11%8%47%8%5%6%5%5%8%27%
1848
October1st to 15thDay
7%5%36%7%35%448%41%
1779
16th to endDay
7%5%24424446%51%
1760
November1st to 15thDay
6%424425%5%5%7%52%
1757
16th to endDay
9%4245%34346%50%
1644
December1st to 15thDay
10%6%246%3445%6%45%
1620
16th to endDay
9%6%26%435%5%6%8%41%
1728
January1st to 15thNight
11%5%35%5%25%447%43%
2327
16th to endNight
14%5%245%2335%7%43%
2430
February1st to 15thNight
11%5%34433335%51%
2103
16th to endNight
11%5%25%423345%49%
1884
March1st to 15thNight
7%33443336%8%51%
1980
16th to endNight
7%414324346%55%
2112
April1st to 15thNight
6%42432445%7%52%
1976
16th to endNight
431442446%9%55%
1798
May1st to 15thNight
42223245%6%9%56%
1619
16th to endNight
43234235%6%9%54%
1682
June1st to 15thNight
9%5%25%4347%8%13%35%
1620
16th to endNight
5%325%5%36%6%8%14%38%
1620
July1st to 15thNight
5%414447%8%9%15%34%
1620
16th to endNight
2335%7%5%7%7%9%13%31%
1703
August1st to 15thNight
5%415%5%5%7%7%10%13%32%
1646
16th to endNight
7%5%27%6%45%6%8%11%34%
2000
September1st to 15thNight
8%6%27%5%36%7%9%11%30%
1980
16th to endNight
11%6%36%5%36%6%7%10%32%
1858
October1st to 15thNight
7%5%1442445%7%49%
1851
16th to endNight
7%4245%2335%7%52%
2112
November1st to 15thNight
6%32342345%7%54%
2101
16th to endNight
7%5%1443445%7%51%
2313
December1st to 15thNight
10%5%25%42335%8%46%
2340
16th to endNight
10%6%35%5%24448%44%
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
39%5%8%18%17%10%
1612
16th to endDay
39%38%17%20%10%
1792
February1st to 15thDay
39%46%13%19%15%
1752
16th to endDay
36%410%12%22%12%
1589
March1st to 15thDay
28%5%10%22%22%10%
1980
16th to endDay
31%5%11%21%18%11%
2112
April1st to 15thDay
32%7%9%17%22%9%
1972
16th to endDay
30%6%12%20%18%10%
2169
May1st to 15thDay
29%6%13%21%19%8%
2331
16th to endDay
36%9%14%20%14%3
2435
June1st to 15thDay
47%13%15%16%6%
2340
16th to endDay
46%14%18%16%4
2340
July1st to 15thDay
47%14%24%11%1
2201
16th to endDay
52%12%20%10%2
2310
August1st to 15thDay
50%18%19%9%1
2297
16th to endDay
53%15%17%10%2
2187
September1st to 15thDay
51%14%17%10%5%
1980
16th to endDay
52%8%13%13%9%3
1848
October1st to 15thDay
41%5%9%15%15%12%
1779
16th to endDay
32%5%8%14%22%15%
1760
November1st to 15thDay
30%410%21%21%12%
1757
16th to endDay
35%38%16%22%12%
1644
December1st to 15thDay
38%5%9%22%16%6%
1620
16th to endDay
37%7%12%21%12%9%
1728
January1st to 15thNight
39%5%9%18%17%9%
2327
16th to endNight
40%5%8%13%23%10%
2430
February1st to 15thNight
35%46%15%21%15%
2112
16th to endNight
37%5%8%15%21%11%
1884
March1st to 15thNight
30%5%11%22%20%10%
1980
16th to endNight
29%6%12%20%20%11%
2112
April1st to 15thNight
30%6%11%19%23%8%
1976
16th to endNight
25%6%12%25%20%8%
1798
May1st to 15thNight
22%8%14%25%19%9%
1620
16th to endNight
25%8%18%25%18%2
1684
June1st to 15thNight
36%12%22%23%5%
1620
16th to endNight
33%14%25%20%5%
1620
July1st to 15thNight
34%17%29%15%2
1530
16th to endNight
37%17%28%12%3
1595
August1st to 15thNight
36%17%31%13%1
1635
16th to endNight
40%14%24%15%4
2000
September1st to 15thNight
41%16%22%12%5%
1980
16th to endNight
43%10%15%17%9%3
1858
October1st to 15thNight
30%8%12%16%19%11%
1851
16th to endNight
31%5%8%16%24%13%
2112
November1st to 15thNight
26%5%11%21%24%11%
2101
16th to endNight
31%5%10%18%18%15%
2313
December1st to 15thNight
35%411%25%15%7%
2340
16th to endNight
38%411%21%15%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
13%11%40%15%12%7%
90
16th to endDay
17%12%34%21%13%
96
February1st to 15thDay
10%22%25%23%17%1
90
16th to endDay
6%11%33%33%14%1
90
March1st to 15thDay
12%429%31%17%3
270
16th to endDay
10%5%25%28%27%3
288
April1st to 15thDay
13%6%21%27%24%5%
270
16th to endDay
4217%30%32%12%
270
May1st to 15thDay
7%415%24%26%20%
288
16th to endDay
7%15%19%32%32%
331
June1st to 15thDay
12%16%14%26%38%
315
16th to endDay
6%411%32%45%
315
July1st to 15thDay
6%7%25%59%
305
16th to endDay
6%311%21%55%
326
August1st to 15thDay
13%5%11%19%49%
313
16th to endDay
11%212%26%46%
332
September1st to 15thDay
15%417%27%33%
315
16th to endDay
13%26%17%36%24%
266
October1st to 15thDay
12%111%30%31%11%
255
16th to endDay
7%418%31%30%6%
272
November1st to 15thDay
8%316%35%27%7%
265
16th to endDay
10%127%31%22%6%
114
December1st to 15thDay
7%437%32%13%4
90
16th to endDay
13%5%16%39%19%5%
96
January1st to 15thNight
13%10%27%32%15%
720
16th to endNight
16%9%28%34%10%
768
February1st to 15thNight
14%5%30%35%11%1
704
16th to endNight
12%8%31%39%6%
631
March1st to 15thNight
10%7%30%38%12%
720
16th to endNight
10%429%36%17%
768
April1st to 15thNight
9%429%39%15%
718
16th to endNight
7%323%42%20%1
651
May1st to 15thNight
5%220%44%23%2
540
16th to endNight
6%110%35%38%6%
563
June1st to 15thNight
13%5%31%35%12%
540
16th to endNight
7%320%43%23%
540
July1st to 15thNight
7%313%44%28%
510
16th to endNight
3214%56%22%
564
August1st to 15thNight
7%212%52%24%
539
16th to endNight
10%16%17%44%19%
663
September1st to 15thNight
12%17%24%39%15%
720
16th to endNight
13%8%33%37%5%
673
October1st to 15thNight
10%212%39%31%3
660
16th to endNight
9%219%38%27%2
704
November1st to 15thNight
8%322%41%21%1
700
16th to endNight
9%5%27%40%15%1
720
December1st to 15thNight
12%6%25%36%18%
720
16th to endNight
12%6%23%37%18%
768
Page generated at 2017-09-20 04:49:53. Version ac04

Copyright 2017 A. Danko


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