Coffeeville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Coffeeville clear sky chart from 2005-11-05 to 2017-12-02.

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
52%
15427
24%
47924
18%
15384
60%
15384
31%
28358

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
33%
720
28%
2207
13%
716
48%
716
26%
1319
January16th to endNight
29%
768
26%
2304
12%
768
41%
768
25%
1476
February1st to 15thNight
33%
704
26%
2112
13%
701
44%
701
28%
1281
February16th to endNight
28%
631
25%
1893
10%
631
40%
631
25%
1208
March1st to 15thNight
33%
720
22%
2160
11%
720
41%
720
27%
1345
March16th to endNight
43%
621
28%
2007
17%
621
54%
621
32%
1116
April1st to 15thNight
42%
539
24%
1797
18%
539
53%
539
31%
1018
April16th to endNight
51%
540
29%
1800
24%
540
62%
540
37%
946
May1st to 15thNight
57%
539
22%
1764
17%
539
65%
539
34%
988
May16th to endNight
69%
561
23%
1682
20%
561
72%
561
35%
971
June1st to 15thNight
71%
540
15%
1620
14%
540
72%
540
31%
996
June16th to endNight
74%
540
17%
1620
17%
540
75%
540
34%
973
July1st to 15thNight
80%
510
12%
1545
13%
510
80%
510
32%
973
July16th to endNight
79%
564
13%
1772
15%
531
80%
531
29%
1086
August1st to 15thNight
79%
539
13%
1788
15%
536
80%
536
30%
1064
August16th to endNight
71%
573
19%
1910
22%
573
72%
573
23%
1254
September1st to 15thNight
64%
577
18%
1837
20%
577
65%
577
28%
1156
September16th to endNight
66%
717
28%
1980
22%
717
68%
717
36%
1198
October1st to 15thNight
61%
720
33%
1980
23%
720
67%
720
46%
1081
October16th to endNight
57%
768
38%
2283
30%
768
65%
768
44%
1195
November1st to 15thNight
57%
760
31%
2467
26%
760
67%
760
37%
1293
November16th to endNight
46%
780
32%
2535
24%
780
59%
780
34%
1383
December1st to 15thNight
41%
728
25%
2365
19%
728
50%
728
28%
1387
December16th to endNight
32%
768
21%
2496
14%
768
41%
768
21%
1651

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
11%5%25%5%35%5%5%7%42%
48500
Night
10%42442445%8%47%
48137
TransparencyDay
40%410%19%18%6%
48215
Night
35%411%19%20%8%
47926
SeeingDay
13%5%15%23%26%16%
5324
Night
13%6%20%29%24%5%
15430

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%5%3442235%5%45%
1728
16th to endDay
18%5%23423335%46%
1920
February1st to 15thDay
14%6%24424446%46%
1750
16th to endDay
17%7%25%423335%43%
1580
March1st to 15thDay
14%6%26%5%24346%42%
1800
16th to endDay
12%5%2443445%6%45%
2225
April1st to 15thDay
13%5%2442445%7%43%
2151
16th to endDay
8%425%435%5%5%7%46%
2160
May1st to 15thDay
11%5%25%6%245%6%6%41%
2184
16th to endDay
7%426%6%46%5%6%8%41%
2431
June1st to 15thDay
7%5%26%6%47%6%8%9%35%
2340
16th to endDay
6%325%8%47%7%7%10%35%
2340
July1st to 15thDay
9%437%8%5%9%8%8%8%28%
2321
16th to endDay
7%5%37%7%5%8%8%8%9%28%
2276
August1st to 15thDay
6%5%37%8%47%7%6%11%30%
2160
16th to endDay
11%6%38%7%47%6%6%8%31%
2292
September1st to 15thDay
10%6%25%7%5%6%5%5%8%37%
2109
16th to endDay
9%325%5%35%446%49%
1980
October1st to 15thDay
9%42432436%5%54%
1980
16th to endDay
8%413313445%57%
1938
November1st to 15thDay
10%424312336%55%
1720
16th to endDay
12%413423345%55%
1755
December1st to 15thDay
13%6%36%424346%43%
1632
16th to endDay
20%7%35%5%34335%35%
1728
January1st to 15thNight
14%5%23423335%49%
2207
16th to endNight
19%7%34413235%44%
2304
February1st to 15thNight
13%5%34414345%47%
2103
16th to endNight
15%6%35%424335%45%
1893
March1st to 15thNight
14%6%25%324348%44%
2160
16th to endNight
12%5%23313336%54%
2007
April1st to 15thNight
10%4244235%5%7%48%
1797
16th to endNight
8%5%13224347%56%
1800
May1st to 15thNight
10%4133135%5%10%48%
1763
16th to endNight
6%3145%35%6%7%10%47%
1682
June1st to 15thNight
5%425%6%35%6%9%11%39%
1620
16th to endNight
4425%425%6%8%13%41%
1620
July1st to 15thNight
5%3346%37%7%8%13%38%
1636
16th to endNight
33145%46%8%10%14%36%
1892
August1st to 15thNight
5%3145%36%7%9%13%37%
1800
16th to endNight
9%5%25%6%36%7%6%10%36%
1910
September1st to 15thNight
8%5%26%5%36%5%5%7%42%
1837
16th to endNight
7%425%4345%5%8%47%
1980
October1st to 15thNight
8%31332345%8%55%
1980
16th to endNight
11%313212235%62%
2283
November1st to 15thNight
10%313323245%57%
2467
16th to endNight
10%42442335%5%54%
2535
December1st to 15thNight
14%5%24323446%47%
2365
16th to endNight
18%8%35%424445%38%
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%24%9%
1729
16th to endDay
41%15%15%27%8%
1920
February1st to 15thDay
40%25%18%25%8%
1752
16th to endDay
44%2317%22%9%
1580
March1st to 15thDay
43%28%17%22%6%
1800
16th to endDay
39%29%20%22%5%
2226
April1st to 15thDay
39%27%20%21%8%
2151
16th to endDay
35%39%22%23%4
2160
May1st to 15thDay
39%311%17%22%5%
2184
16th to endDay
38%412%25%16%1
2435
June1st to 15thDay
42%5%13%23%13%1
2340
16th to endDay
40%7%16%22%11%2
2340
July1st to 15thDay
47%8%19%15%7%1
2183
16th to endDay
47%7%19%20%5%
2133
August1st to 15thDay
43%6%20%18%9%1
2148
16th to endDay
49%7%14%15%9%3
2292
September1st to 15thDay
44%413%18%13%5%
2109
16th to endDay
35%311%21%20%7%
1980
October1st to 15thDay
30%38%19%25%12%
1980
16th to endDay
28%2414%32%18%
1938
November1st to 15thDay
31%17%18%28%11%
1720
16th to endDay
32%26%17%27%14%
1755
December1st to 15thDay
42%27%21%19%6%
1632
16th to endDay
51%26%19%14%5%
1728
January1st to 15thNight
38%25%17%26%8%
2207
16th to endNight
43%1414%25%9%
2304
February1st to 15thNight
38%27%18%20%13%
2112
16th to endNight
42%3414%23%11%
1893
March1st to 15thNight
40%29%16%22%8%
2160
16th to endNight
32%29%22%24%7%
2007
April1st to 15thNight
34%211%17%22%10%
1797
16th to endNight
28%39%24%26%7%
1800
May1st to 15thNight
31%5%12%20%20%9%
1764
16th to endNight
30%7%15%23%19%3
1684
June1st to 15thNight
34%7%19%23%13%1
1620
16th to endNight
31%7%22%21%12%3
1620
July1st to 15thNight
32%10%28%17%9%2
1545
16th to endNight
31%11%26%24%4
1772
August1st to 15thNight
32%8%27%18%10%2
1788
16th to endNight
40%9%18%15%12%3
1910
September1st to 15thNight
39%5%16%18%12%7%
1837
16th to endNight
33%5%11%21%19%8%
1980
October1st to 15thNight
26%210%20%23%16%
1980
16th to endNight
26%1414%30%21%
2283
November1st to 15thNight
29%26%18%27%14%
2467
16th to endNight
32%15%18%24%17%
2535
December1st to 15thNight
38%110%22%21%6%
2365
16th to endNight
48%26%18%18%5%
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
15%16%31%21%11%4
90
16th to endDay
26%18%32%15%7%
96
February1st to 15thDay
17%20%33%26%11
90
16th to endDay
22%13%37%25%1
81
March1st to 15thDay
21%25%37%12%3
90
16th to endDay
17%9%25%30%16%
246
April1st to 15thDay
19%10%24%22%18%4
270
16th to endDay
11%5%26%31%20%4
270
May1st to 15thDay
12%6%21%25%25%9%
288
16th to endDay
12%215%28%24%16%
331
June1st to 15thDay
11%16%24%33%22%
315
16th to endDay
10%15%22%32%27%
315
July1st to 15thDay
8%116%40%31%
305
16th to endDay
8%1116%34%37%
326
August1st to 15thDay
10%1216%37%31%
313
16th to endDay
12%2315%36%28%
332
September1st to 15thDay
12%38%17%36%22%
315
16th to endDay
9%7%29%32%20%
314
October1st to 15thDay
10%317%28%30%8%
315
16th to endDay
15%6%23%30%17%7%
162
November1st to 15thDay
18%228%33%14%2
135
16th to endDay
9%11%28%30%14%5%
135
December1st to 15thDay
23%11%32%19%9%3
94
16th to endDay
31%12%25%22%6%2
96
January1st to 15thNight
18%12%29%29%8%
720
16th to endNight
22%11%31%28%5%
768
February1st to 15thNight
17%12%31%29%8%
704
16th to endNight
19%13%33%28%4
631
March1st to 15thNight
18%12%31%29%8%
720
16th to endNight
14%8%29%30%15%1
621
April1st to 15thNight
12%8%32%29%15%
539
16th to endNight
12%5%27%37%17%
540
May1st to 15thNight
12%321%35%25%2
540
16th to endNight
7%112%39%34%4
563
June1st to 15thNight
7%6%31%44%9%
540
16th to endNight
7%1424%44%18%
540
July1st to 15thNight
5%122%46%22%
510
16th to endNight
31323%45%23%
564
August1st to 15thNight
7%1120%47%21%
539
16th to endNight
12%1320%42%19%
573
September1st to 15thNight
11%19%21%43%12%
577
16th to endNight
10%9%34%39%5%
717
October1st to 15thNight
10%121%30%32%3
720
16th to endNight
13%419%29%28%3
768
November1st to 15thNight
12%419%35%22%4
760
16th to endNight
12%8%24%33%19%1
780
December1st to 15thNight
19%9%26%29%14%
728
16th to endNight
22%10%29%27%9%
768
Page generated at 2017-12-03 10:16:48. Version ac04

Copyright 2017 A. Danko


Coffeeville Clear Sky Chart |Charts Home