Stinesville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Stinesville clear sky chart from 2005-11-05 to 2017-10-31.

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
36%
15963
19%
47327
12%
15920
43%
15920
23%
31382

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
15%
900
14%
2506
4%
895
24%
895
14%
1894
January16th to endNight
15%
923
14%
2618
4%
923
24%
923
15%
1948
February1st to 15thNight
16%
703
13%
2112
4%
701
24%
701
14%
1538
February16th to endNight
17%
631
15%
1893
6%
631
25%
631
14%
1366
March1st to 15thNight
21%
720
14%
2160
8%
720
26%
720
16%
1540
March16th to endNight
26%
693
16%
2037
6%
693
35%
693
19%
1428
April1st to 15thNight
30%
539
19%
1797
11%
539
42%
539
21%
1155
April16th to endNight
32%
540
20%
1722
11%
540
42%
540
25%
1091
May1st to 15thNight
32%
540
15%
1620
8%
540
38%
540
20%
1137
May16th to endNight
49%
561
17%
1638
12%
561
53%
561
26%
1087
June1st to 15thNight
53%
540
19%
1440
12%
540
58%
540
36%
884
June16th to endNight
58%
540
21%
1440
14%
540
63%
540
39%
871
July1st to 15thNight
62%
510
17%
1360
12%
510
65%
510
37%
843
July16th to endNight
73%
564
25%
1456
20%
531
76%
531
44%
821
August1st to 15thNight
70%
539
22%
1648
19%
536
72%
536
37%
943
August16th to endNight
71%
573
24%
1910
24%
573
75%
573
37%
1027
September1st to 15thNight
59%
594
26%
1854
22%
594
65%
594
33%
1074
September16th to endNight
57%
717
28%
1980
21%
717
61%
717
36%
1189
October1st to 15thNight
49%
720
30%
1980
20%
720
57%
720
35%
1189
October16th to endNight
30%
768
22%
2464
15%
768
40%
768
24%
1534
November1st to 15thNight
35%
700
26%
2276
17%
700
49%
700
26%
1345
November16th to endNight
26%
720
20%
2340
12%
720
37%
720
17%
1570
December1st to 15thNight
21%
768
12%
2388
7%
768
26%
768
14%
1805
December16th to endNight
14%
960
12%
2688
3%
960
23%
960
12%
2103

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
14%7%35%5%3445%7%38%
48424
Night
14%8%35%424446%40%
47500
Cloud CoverDay
14%7%35%5%3445%7%38%
48433
Night
14%8%35%423446%40%
47505
TransparencyDay
44%6%11%21%13%2
48115
Night
43%5%11%21%14%2
47327
SeeingDay
17%10%27%23%14%6%
5973
Night
18%12%27%25%14%1
15966

By Month

Percentage Cloud Cover NE (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
19%11%48%5%3444429%
1432
16th to endDay
12%15%6%6%6%24335%33%
1602
February1st to 15thDay
15%12%6%7%434445%31%
1750
16th to endDay
13%13%49%5%3445%5%30%
1580
March1st to 15thDay
22%9%36%434445%33%
1790
16th to endDay
16%10%46%5%3445%7%31%
2196
April1st to 15thDay
17%7%2442445%6%39%
2151
16th to endDay
18%7%35%5%34346%38%
2238
May1st to 15thDay
20%7%37%5%24446%32%
2331
16th to endDay
12%6%35%6%35%5%6%7%36%
2474
June1st to 15thDay
10%4245%245%6%9%44%
2520
16th to endDay
10%4245%35%6%5%10%41%
2520
July1st to 15thDay
11%4345%36%46%10%38%
2520
16th to endDay
6%3246%36%6%7%9%42%
2613
August1st to 15thDay
9%3245%35%6%6%10%42%
2298
16th to endDay
7%4246%35%5%6%7%44%
2292
September1st to 15thDay
12%5%25%4245%6%7%42%
2093
16th to endDay
12%4135%3445%7%48%
1980
October1st to 15thDay
14%5%246%24347%43%
1979
16th to endDay
17%7%25%42436%5%41%
1758
November1st to 15thDay
12%424424447%49%
1582
16th to endDay
19%9%36%422346%37%
1620
December1st to 15thDay
21%14%46%423245%30%
1569
16th to endDay
21%13%5%6%423336%29%
1536
January1st to 15thNight
17%11%5%8%7%25%335%29%
2506
16th to endNight
15%13%6%8%5%24345%30%
2618
February1st to 15thNight
16%12%5%8%43345%5%30%
2110
16th to endNight
17%10%46%5%24345%33%
1893
March1st to 15thNight
18%9%46%434445%35%
2147
16th to endNight
17%9%35%5%24447%35%
2037
April1st to 15thNight
16%7%345%33345%42%
1797
16th to endNight
15%6%3442345%6%42%
1722
May1st to 15thNight
18%6%35%5%2445%8%34%
1620
16th to endNight
10%425%5%35%46%8%40%
1636
June1st to 15thNight
8%425%5%2335%8%49%
1440
16th to endNight
7%3133345%6%10%49%
1440
July1st to 15thNight
8%5%1332447%9%48%
1440
16th to endNight
5%313334448%56%
1555
August1st to 15thNight
5%314425%45%9%51%
1659
16th to endNight
43244345%6%8%53%
1910
September1st to 15thNight
10%5%24323447%51%
1854
16th to endNight
10%424423347%52%
1980
October1st to 15thNight
10%425%323447%51%
1980
16th to endNight
17%7%24323345%44%
2464
November1st to 15thNight
11%6%24433346%48%
2276
16th to endNight
19%9%35%323346%37%
2340
December1st to 15thNight
20%13%6%8%413345%27%
2388
16th to endNight
24%13%46%424445%26%
2688

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
19%11%48%5%2444429%
1432
16th to endDay
12%15%6%6%6%24335%33%
1602
February1st to 15thDay
15%12%6%7%5%34446%30%
1750
16th to endDay
14%12%48%5%3445%5%30%
1580
March1st to 15thDay
23%8%36%434345%32%
1800
16th to endDay
17%10%46%5%3445%6%32%
2195
April1st to 15thDay
18%7%2442445%6%39%
2151
16th to endDay
18%6%35%5%34345%38%
2238
May1st to 15thDay
21%7%46%5%24436%32%
2331
16th to endDay
12%7%25%6%35%5%6%8%36%
2474
June1st to 15thDay
10%4245%345%6%8%44%
2520
16th to endDay
10%4246%35%6%5%10%41%
2520
July1st to 15thDay
11%5%34436%47%9%38%
2520
16th to endDay
6%3246%46%6%7%10%42%
2613
August1st to 15thDay
8%3245%35%6%6%10%42%
2298
16th to endDay
7%4246%35%5%6%8%44%
2292
September1st to 15thDay
13%425%4345%6%7%42%
2093
16th to endDay
12%4135%2445%7%48%
1980
October1st to 15thDay
15%5%15%6%24447%43%
1979
16th to endDay
17%6%25%42435%5%41%
1758
November1st to 15thDay
12%434323447%49%
1582
16th to endDay
19%9%26%423346%37%
1620
December1st to 15thDay
21%14%46%413245%30%
1569
16th to endDay
21%13%5%6%423336%29%
1536
January1st to 15thNight
17%11%48%6%34435%29%
2506
16th to endNight
15%13%6%8%6%24345%30%
2618
February1st to 15thNight
16%12%5%8%43345%5%30%
2103
16th to endNight
17%10%5%6%6%25%34433%
1893
March1st to 15thNight
18%10%36%5%2434435%
2160
16th to endNight
17%8%35%5%23447%36%
2037
April1st to 15thNight
16%7%345%23345%42%
1797
16th to endNight
15%6%3442345%7%42%
1722
May1st to 15thNight
19%7%35%42445%8%34%
1619
16th to endNight
10%425%6%35%46%8%41%
1636
June1st to 15thNight
8%5%25%43335%9%48%
1440
16th to endNight
7%31343446%11%49%
1440
July1st to 15thNight
8%5%124345%7%8%49%
1440
16th to endNight
5%313334448%56%
1555
August1st to 15thNight
6%314435%5%5%9%51%
1659
16th to endNight
5%3244345%6%7%53%
1910
September1st to 15thNight
11%42441335%6%51%
1854
16th to endNight
10%424423346%52%
1980
October1st to 15thNight
10%414423446%51%
1980
16th to endNight
18%7%24423345%44%
2464
November1st to 15thNight
11%6%34423446%48%
2276
16th to endNight
19%9%35%422346%37%
2340
December1st to 15thNight
21%12%6%8%5%1334427%
2388
16th to endNight
24%13%46%42443426%
2688

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
57%410%15%11%
1433
16th to endDay
53%411%23%6%
1602
February1st to 15thDay
54%411%20%8%1
1752
16th to endDay
53%5%11%22%7%
1580
March1st to 15thDay
53%410%21%9%
1800
16th to endDay
52%412%21%8%
2196
April1st to 15thDay
44%411%23%14%
2151
16th to endDay
47%49%21%12%4
2238
May1st to 15thDay
51%6%11%17%11%
2331
16th to endDay
43%8%13%18%14%2
2478
June1st to 15thDay
35%8%11%25%16%3
2520
16th to endDay
36%7%14%20%16%3
2520
July1st to 15thDay
41%7%12%19%16%2
2371
16th to endDay
33%8%17%24%14%1
2449
August1st to 15thDay
34%9%12%23%17%2
2285
16th to endDay
34%7%12%23%16%6%
2292
September1st to 15thDay
38%6%9%22%17%4
2093
16th to endDay
35%5%8%24%23%2
1980
October1st to 15thDay
40%5%10%23%19%2
1979
16th to endDay
43%410%24%15%
1758
November1st to 15thDay
34%413%22%18%5%
1582
16th to endDay
48%310%21%15%1
1620
December1st to 15thDay
57%310%17%9%
1569
16th to endDay
57%411%20%5%1
1536
January1st to 15thNight
56%48%18%10%
2506
16th to endNight
56%412%19%7%
2618
February1st to 15thNight
54%413%19%6%1
2112
16th to endNight
53%5%12%18%9%
1893
March1st to 15thNight
51%5%9%20%10%1
2160
16th to endNight
48%5%13%22%7%1
2037
April1st to 15thNight
44%49%24%15%2
1797
16th to endNight
41%410%22%14%6%
1722
May1st to 15thNight
47%7%11%20%11%
1620
16th to endNight
40%7%13%17%15%5%
1638
June1st to 15thNight
33%5%10%26%21%2
1440
16th to endNight
28%8%15%23%19%5%
1440
July1st to 15thNight
30%7%15%21%20%4
1360
16th to endNight
24%6%12%33%18%3
1456
August1st to 15thNight
28%7%16%23%20%3
1648
16th to endNight
26%6%14%26%20%6%
1910
September1st to 15thNight
33%5%9%22%21%7%
1854
16th to endNight
33%49%21%25%5%
1980
October1st to 15thNight
31%410%25%22%5%
1980
16th to endNight
42%29%26%16%2
2464
November1st to 15thNight
37%39%21%21%6%
2276
16th to endNight
48%39%21%15%
2340
December1st to 15thNight
59%310%16%9%
2388
16th to endNight
61%49%15%8%
2688

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
33%24%31%6%31
90
16th to endDay
14%38%39%7%
96
February1st to 15thDay
22%40%28%6%2
90
16th to endDay
16%25%48%9%
81
March1st to 15thDay
37%21%33%7%
90
16th to endDay
23%15%34%17%7%1
288
April1st to 15thDay
22%15%29%21%9%1
270
16th to endDay
25%10%30%18%11%2
270
May1st to 15thDay
28%11%33%14%8%2
288
16th to endDay
18%8%31%20%10%9%
374
June1st to 15thDay
12%5%28%33%16%4
495
16th to endDay
13%6%35%24%13%6%
495
July1st to 15thDay
16%426%24%18%9%
475
16th to endDay
7%319%33%21%14%
473
August1st to 15thDay
14%212%29%23%17%
313
16th to endDay
9%319%25%29%11%
332
September1st to 15thDay
13%6%16%27%23%12%
315
16th to endDay
14%7%16%23%28%10%
314
October1st to 15thDay
17%9%26%25%15%5%
314
16th to endDay
20%15%36%24%2
144
November1st to 15thDay
8%16%27%31%10%5%
90
16th to endDay
32%20%26%15%5%
90
December1st to 15thDay
18%31%28%17%12
90
16th to endDay
33%30%30%6%
96
January1st to 15thNight
25%21%34%16%2
900
16th to endNight
22%22%34%18%1
923
February1st to 15thNight
22%23%34%18%1
704
16th to endNight
22%21%35%19%1
631
March1st to 15thNight
26%19%30%21%2
720
16th to endNight
21%17%31%21%7%
693
April1st to 15thNight
19%16%30%25%7%
539
16th to endNight
18%7%36%24%11%1
540
May1st to 15thNight
19%10%31%27%10%
540
16th to endNight
12%5%26%32%19%4
563
June1st to 15thNight
9%327%37%20%
540
16th to endNight
7%227%36%25%1
540
July1st to 15thNight
10%119%34%30%3
510
16th to endNight
6%112%36%35%7%
564
August1st to 15thNight
7%15%34%34%7%
539
16th to endNight
4115%34%38%5%
573
September1st to 15thNight
12%5%16%31%28%5%
594
16th to endNight
12%6%16%27%31%5%
717
October1st to 15thNight
13%8%22%28%21%4
720
16th to endNight
20%15%30%22%9%
768
November1st to 15thNight
16%11%33%24%13%1
700
16th to endNight
25%18%24%23%7%
720
December1st to 15thNight
30%16%28%16%6%
768
16th to endNight
31%16%32%16%3
960
Page generated at 2017-11-01 17:23:31. Version ac04

Copyright 2017 A. Danko


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