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 2018-10-27.

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%
17269
21%
51333
17%
17229
64%
17229
30%
31830

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
40%
778
20%
2522
13%
776
50%
776
24%
1567
January16th to endNight
40%
832
24%
2632
17%
832
50%
832
26%
1637
February1st to 15thNight
44%
761
24%
2288
15%
759
54%
759
30%
1402
February16th to endNight
43%
683
26%
2039
16%
683
52%
683
30%
1240
March1st to 15thNight
47%
780
29%
2145
17%
780
56%
780
38%
1248
March16th to endNight
50%
832
25%
2288
16%
832
57%
832
38%
1340
April1st to 15thNight
51%
778
24%
2141
16%
778
57%
778
38%
1270
April16th to endNight
57%
696
28%
1923
18%
696
63%
696
42%
1084
May1st to 15thNight
67%
584
27%
1754
21%
584
72%
584
42%
954
May16th to endNight
71%
609
22%
1826
17%
609
73%
609
35%
1068
June1st to 15thNight
70%
585
13%
1755
11%
585
72%
585
26%
1167
June16th to endNight
78%
585
10%
1755
8%
585
79%
585
27%
1169
July1st to 15thNight
80%
555
10%
1665
10%
555
80%
555
24%
1139
July16th to endNight
76%
612
7%
1739
8%
579
77%
579
22%
1235
August1st to 15thNight
78%
575
8%
1743
8%
572
78%
572
23%
1230
August16th to endNight
68%
719
10%
2168
11%
719
68%
719
20%
1549
September1st to 15thNight
66%
780
10%
2145
10%
780
66%
780
20%
1558
September16th to endNight
66%
777
18%
2145
17%
777
67%
777
25%
1468
October1st to 15thNight
67%
780
28%
2187
26%
780
70%
780
35%
1326
October16th to endNight
60%
816
30%
2447
27%
816
67%
816
36%
1409
November1st to 15thNight
60%
760
30%
2281
26%
760
67%
760
41%
1233
November16th to endNight
52%
780
29%
2506
23%
780
63%
780
34%
1402
December1st to 15thNight
50%
780
27%
2535
23%
780
58%
780
30%
1499
December16th to endNight
50%
832
23%
2704
20%
832
57%
832
27%
1636

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
8%5%25%6%46%5%6%8%39%
52206
Night
8%425%4345%6%9%45%
51537
TransparencyDay
40%9%13%16%13%6%
51907
Night
33%8%15%19%15%7%
51340
SeeingDay
10%314%22%25%23%
7148
Night
10%419%32%26%6%
17277

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
13%6%26%42345%7%43%
1746
16th to endDay
12%5%35%5%23346%46%
1942
February1st to 15thDay
16%5%25%423445%45%
1900
16th to endDay
10%5%2443435%5%50%
1720
March1st to 15thDay
8%31431445%8%54%
2145
16th to endDay
7%5%2443445%8%50%
2287
April1st to 15thDay
8%3245%2445%8%47%
2137
16th to endDay
5%2145%45%5%5%8%50%
2319
May1st to 15thDay
6%323425%5%6%8%50%
2526
16th to endDay
7%425%7%47%6%6%8%38%
2639
June1st to 15thDay
8%5%36%7%5%9%7%7%10%27%
2535
16th to endDay
6%436%7%48%8%9%11%28%
2535
July1st to 15thDay
6%5%37%8%5%9%8%8%12%24%
2535
16th to endDay
8%5%38%9%7%9%7%7%9%22%
2673
August1st to 15thDay
10%6%26%8%6%9%9%9%11%19%
2455
16th to endDay
10%6%38%8%5%8%8%8%8%22%
2370
September1st to 15thDay
10%6%38%8%5%8%7%7%10%23%
2145
16th to endDay
10%7%37%8%5%6%5%5%8%29%
2145
October1st to 15thDay
7%5%36%7%35%448%42%
2103
16th to endDay
7%4244245%47%51%
2034
November1st to 15thDay
6%42442445%7%54%
1907
16th to endDay
9%4235%34346%51%
1781
December1st to 15thDay
10%7%345%24446%45%
1755
16th to endDay
9%6%26%435%5%6%8%41%
1872
January1st to 15thNight
11%6%35%5%25%447%42%
2522
16th to endNight
14%5%245%2335%7%44%
2632
February1st to 15thNight
10%5%34433345%49%
2283
16th to endNight
10%5%25%423345%50%
2039
March1st to 15thNight
7%32443336%8%52%
2145
16th to endNight
7%414324346%56%
2288
April1st to 15thNight
7%42432445%7%52%
2141
16th to endNight
431442446%9%55%
1923
May1st to 15thNight
43223245%6%9%56%
1754
16th to endNight
43245%3447%9%50%
1826
June1st to 15thNight
8%425%4347%8%13%36%
1755
16th to endNight
5%325%5%36%6%9%14%37%
1755
July1st to 15thNight
4314446%8%10%14%35%
1755
16th to endNight
2336%7%5%8%7%10%13%31%
1847
August1st to 15thNight
5%415%5%5%7%7%10%13%31%
1754
16th to endNight
7%5%27%6%45%6%8%11%33%
2168
September1st to 15thNight
8%6%27%5%36%7%9%11%30%
2145
16th to endNight
9%5%35%5%35%6%7%10%35%
2145
October1st to 15thNight
7%42442345%7%50%
2187
16th to endNight
7%4245%2335%7%52%
2447
November1st to 15thNight
6%32342345%7%56%
2281
16th to endNight
7%5%1443445%7%51%
2506
December1st to 15thNight
10%5%25%42335%8%46%
2535
16th to endNight
10%6%25%5%24448%44%
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
41%5%8%17%17%10%
1747
16th to endDay
38%38%17%21%10%
1942
February1st to 15thDay
40%5%7%12%18%14%
1902
16th to endDay
35%5%10%13%23%11%
1720
March1st to 15thDay
27%5%10%21%22%12%
2145
16th to endDay
31%5%11%21%18%10%
2288
April1st to 15thDay
32%7%9%18%22%8%
2137
16th to endDay
30%6%11%20%19%10%
2319
May1st to 15thDay
29%6%13%20%20%8%
2526
16th to endDay
39%10%13%19%13%3
2643
June1st to 15thDay
47%14%15%15%6%
2535
16th to endDay
44%14%19%16%4
2535
July1st to 15thDay
47%14%25%12%1
2396
16th to endDay
52%12%20%11%2
2518
August1st to 15thDay
49%18%19%10%1
2442
16th to endDay
53%15%18%10%2
2370
September1st to 15thDay
50%14%18%9%5%
2145
16th to endDay
49%8%15%15%8%3
2145
October1st to 15thDay
40%6%9%17%15%10%
2103
16th to endDay
30%6%9%14%23%15%
2034
November1st to 15thDay
28%5%10%22%21%11%
1907
16th to endDay
34%38%17%23%12%
1781
December1st to 15thDay
38%5%10%22%15%7%
1755
16th to endDay
37%7%12%21%13%8%
1872
January1st to 15thNight
40%5%9%18%17%9%
2522
16th to endNight
39%5%7%13%23%10%
2632
February1st to 15thNight
37%47%15%20%14%
2292
16th to endNight
36%5%9%16%22%10%
2039
March1st to 15thNight
29%5%11%21%20%11%
2145
16th to endNight
28%6%12%21%20%10%
2288
April1st to 15thNight
29%6%11%21%22%8%
2141
16th to endNight
25%6%12%25%20%9%
1923
May1st to 15thNight
23%7%13%26%20%8%
1755
16th to endNight
28%8%18%23%17%2
1828
June1st to 15thNight
35%13%23%21%5%
1755
16th to endNight
32%15%25%19%5%
1755
July1st to 15thNight
33%17%29%16%2
1665
16th to endNight
37%17%28%12%3
1739
August1st to 15thNight
36%17%30%13%1
1743
16th to endNight
40%15%23%14%3
2168
September1st to 15thNight
40%17%23%13%4
2145
16th to endNight
40%10%18%19%8%2
2145
October1st to 15thNight
30%8%13%18%19%9%
2187
16th to endNight
31%5%9%16%23%13%
2447
November1st to 15thNight
25%5%11%22%24%10%
2281
16th to endNight
31%5%9%19%20%14%
2506
December1st to 15thNight
35%411%25%14%8%
2535
16th to endNight
37%5%12%21%15%8%
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
16%11%42%15%8%5%
135
16th to endDay
15%12%34%25%12%
144
February1st to 15thDay
11%17%28%24%15%1
135
16th to endDay
49%26%33%23%1
130
March1st to 15thDay
11%6%30%30%16%3
330
16th to endDay
9%7%26%29%24%2
352
April1st to 15thDay
13%5%22%28%24%4
330
16th to endDay
4220%31%29%11%
319
May1st to 15thDay
8%314%27%25%19%
348
16th to endDay
10%28%20%29%29%
395
June1st to 15thDay
12%15%16%26%37%
375
16th to endDay
5%410%31%47%
375
July1st to 15thDay
6%17%23%60%
365
16th to endDay
7%1414%22%49%
390
August1st to 15thDay
13%412%20%48%
358
16th to endDay
11%212%27%46%
396
September1st to 15thDay
13%5%18%29%33%
375
16th to endDay
10%15%17%36%29%
374
October1st to 15thDay
10%213%29%32%12%
375
16th to endDay
7%5%20%32%26%7%
382
November1st to 15thDay
7%216%36%29%6%
325
16th to endDay
9%322%34%22%6%
161
December1st to 15thDay
11%5%32%33%12%4
135
16th to endDay
11%422%38%18%3
144
January1st to 15thNight
14%10%28%32%14%
780
16th to endNight
15%9%28%35%10%
832
February1st to 15thNight
14%5%31%35%11%1
764
16th to endNight
12%7%30%40%8%
683
March1st to 15thNight
10%7%31%38%12%
780
16th to endNight
10%430%36%17%
832
April1st to 15thNight
10%428%39%16%
778
16th to endNight
6%425%41%19%1
696
May1st to 15thNight
5%219%44%25%2
585
16th to endNight
7%111%35%37%5%
611
June1st to 15thNight
12%5%30%36%14%
585
16th to endNight
7%319%42%26%
585
July1st to 15thNight
6%313%44%30%
555
16th to endNight
4214%55%22%
612
August1st to 15thNight
7%212%52%24%
575
16th to endNight
10%16%16%44%20%
719
September1st to 15thNight
11%17%24%39%16%
780
16th to endNight
12%7%31%39%7%
777
October1st to 15thNight
10%213%38%32%4
780
16th to endNight
9%220%37%27%2
816
November1st to 15thNight
7%321%42%22%2
760
16th to endNight
9%5%26%40%16%1
780
December1st to 15thNight
12%6%25%35%19%
780
16th to endNight
12%6%23%37%18%
832
Page generated at 2018-10-28 08:41:00. Version ac04

Copyright 2018 A. Danko


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