Honey Creek Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Honey Creek Observatory clear sky chart from 2005-11-05 to 2017-10-16.

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
38%
16150
21%
47357
11%
16104
47%
16104
31%
28709

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
27%
900
18%
2506
8%
895
36%
895
26%
1641
January16th to endNight
25%
960
22%
2596
7%
960
36%
960
27%
1701
February1st to 15thNight
25%
858
12%
2267
3%
854
31%
854
22%
1593
February16th to endNight
32%
632
23%
1894
7%
632
44%
632
29%
1150
March1st to 15thNight
30%
642
20%
2082
11%
642
40%
642
27%
1244
March16th to endNight
29%
576
17%
2112
11%
576
39%
576
21%
1303
April1st to 15thNight
31%
539
19%
1806
12%
539
45%
539
26%
1107
April16th to endNight
31%
540
18%
1620
11%
540
42%
540
23%
1082
May1st to 15thNight
35%
540
18%
1620
8%
540
46%
540
29%
1001
May16th to endNight
37%
562
14%
1667
6%
561
44%
561
27%
1073
June1st to 15thNight
44%
540
15%
1419
5%
540
48%
540
34%
902
June16th to endNight
60%
540
20%
1438
8%
540
64%
540
51%
780
July1st to 15thNight
60%
510
17%
1360
7%
510
64%
510
45%
769
July16th to endNight
67%
564
24%
1491
16%
531
70%
531
50%
774
August1st to 15thNight
62%
539
21%
1610
19%
536
66%
536
38%
921
August16th to endNight
58%
573
27%
1746
24%
573
69%
573
43%
912
September1st to 15thNight
52%
540
25%
1923
22%
540
64%
540
38%
971
September16th to endNight
49%
537
31%
1980
23%
537
64%
537
38%
947
October1st to 15thNight
37%
614
29%
2054
18%
614
48%
614
29%
1164
October16th to endNight
41%
809
26%
2225
12%
809
49%
809
36%
1331
November1st to 15thNight
37%
875
28%
2275
11%
875
48%
875
39%
1341
November16th to endNight
34%
900
26%
2377
13%
900
43%
900
35%
1450
December1st to 15thNight
25%
900
17%
2550
6%
900
35%
900
24%
1702
December16th to endNight
29%
960
19%
2739
7%
960
41%
960
23%
1850

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%6%2442445%7%47%
48034
Night
9%6%2442345%6%49%
47532
Cloud CoverDay
11%6%2442445%7%47%
48045
Night
9%6%2442345%7%49%
47536
Cloud CoverDay
11%6%2442445%7%47%
48043
Night
9%6%24424447%49%
47536
TransparencyDay
37%5%14%26%14%2
47728
Night
35%5%13%26%16%2
47357
SeeingDay
14%6%31%31%13%2
6132
Night
12%8%35%33%9%
16152

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
7%8%35%45%5%348%41%
1432
16th to endDay
7%11%37%5%2445%442%
1626
February1st to 15thDay
11%10%47%5%24336%39%
1604
16th to endDay
9%8%46%5%2335%5%45%
1580
March1st to 15thDay
10%8%45%424346%46%
1867
16th to endDay
15%10%36%43445%7%35%
2112
April1st to 15thDay
15%7%24432346%43%
2140
16th to endDay
22%7%25%324347%36%
2340
May1st to 15thDay
13%6%25%5%34446%42%
2331
16th to endDay
16%6%25%423447%41%
2446
June1st to 15thDay
14%42442446%8%44%
2520
16th to endDay
5%32322346%8%57%
2520
July1st to 15thDay
7%3133245%6%9%52%
2520
16th to endDay
5%3123245%6%8%56%
2572
August1st to 15thDay
8%5%245%35%5%6%9%43%
2340
16th to endDay
8%41442435%7%53%
2455
September1st to 15thDay
12%413414446%52%
2037
16th to endDay
9%31331225%6%60%
1980
October1st to 15thDay
15%5%2332334453%
1893
16th to endDay
13%6%23312345%53%
1667
November1st to 15thDay
6%6%2442445%5%53%
1583
16th to endDay
8%8%35%6%33446%45%
1580
December1st to 15thDay
11%9%37%432446%43%
1407
16th to endDay
11%9%47%5%245%37%38%
1482
January1st to 15thNight
5%7%36%7%35%5%5%7%41%
2506
16th to endNight
7%9%36%6%23447%43%
2596
February1st to 15thNight
12%9%37%435%345%38%
2264
16th to endNight
8%6%25%5%34446%47%
1894
March1st to 15thNight
10%7%25%42445%7%46%
2070
16th to endNight
12%7%35%42345%6%43%
2112
April1st to 15thNight
12%8%2441345%6%44%
1806
16th to endNight
16%7%35%424346%40%
1620
May1st to 15thNight
14%5%13324446%48%
1620
16th to endNight
15%5%24434448%44%
1665
June1st to 15thNight
12%5%232245%5%7%48%
1419
16th to endNight
421232345%6%62%
1438
July1st to 15thNight
6%21342337%9%55%
1440
16th to endNight
411331346%10%58%
1593
August1st to 15thNight
33234346%6%7%52%
1620
16th to endNight
5%31322345%8%59%
1746
September1st to 15thNight
8%322323346%59%
1923
16th to endNight
8%313222335%62%
1980
October1st to 15thNight
15%41321233454%
2054
16th to endNight
12%41331335%6%53%
2225
November1st to 15thNight
6%5%23334346%56%
2275
16th to endNight
7%5%35%42345%7%49%
2377
December1st to 15thNight
10%9%36%5%24446%42%
2550
16th to endNight
9%10%46%5%34445%41%
2739

Percentage Cloud Cover SW (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
7%9%45%5%45%348%41%
1432
16th to endDay
7%11%36%6%2445%442%
1626
February1st to 15thDay
11%10%47%434337%39%
1604
16th to endDay
9%8%46%5%23346%45%
1580
March1st to 15thDay
10%7%35%5%24345%46%
1878
16th to endDay
15%9%35%43445%7%35%
2112
April1st to 15thDay
15%6%24433346%44%
2140
16th to endDay
22%7%25%324347%36%
2340
May1st to 15thDay
13%6%245%35%45%6%42%
2331
16th to endDay
17%5%25%423447%41%
2446
June1st to 15thDay
14%42442445%8%44%
2520
16th to endDay
5%32332346%8%57%
2520
July1st to 15thDay
7%3133245%5%9%52%
2520
16th to endDay
43123245%6%8%57%
2572
August1st to 15thDay
8%425%5%35%5%6%9%43%
2340
16th to endDay
8%41442335%7%53%
2455
September1st to 15thDay
12%413314446%53%
2037
16th to endDay
10%31331225%6%60%
1980
October1st to 15thDay
15%5%2332334453%
1893
16th to endDay
13%6%24312345%53%
1667
November1st to 15thDay
6%6%2443445%5%53%
1583
16th to endDay
8%8%35%5%33446%45%
1580
December1st to 15thDay
11%9%36%5%32436%43%
1407
16th to endDay
11%9%47%5%15%437%38%
1482
January1st to 15thNight
5%7%36%6%35%5%6%7%41%
2506
16th to endNight
7%9%46%5%23447%43%
2596
February1st to 15thNight
12%10%37%435%445%38%
2257
16th to endNight
8%6%25%434446%47%
1894
March1st to 15thNight
10%7%25%42345%7%45%
2082
16th to endNight
12%8%345%2445%6%43%
2112
April1st to 15thNight
13%7%2442345%6%44%
1806
16th to endNight
16%7%26%424346%40%
1620
May1st to 15thNight
14%5%13424437%48%
1619
16th to endNight
15%5%24424448%44%
1665
June1st to 15thNight
12%5%1422445%8%48%
1419
16th to endNight
5%21232345%6%62%
1438
July1st to 15thNight
6%31342336%9%55%
1440
16th to endNight
32133235%6%10%58%
1593
August1st to 15thNight
33235%346%6%7%52%
1620
16th to endNight
5%31332345%7%59%
1746
September1st to 15thNight
7%312423446%59%
1923
16th to endNight
8%313212235%62%
1980
October1st to 15thNight
15%41321323455%
2054
16th to endNight
11%413323346%53%
2225
November1st to 15thNight
6%5%23334346%56%
2275
16th to endNight
7%5%35%42345%7%50%
2377
December1st to 15thNight
10%9%36%5%24446%42%
2550
16th to endNight
9%10%46%5%34445%41%
2739

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
7%9%45%5%45%438%41%
1432
16th to endDay
7%10%37%5%245%5%442%
1626
February1st to 15thDay
12%10%46%434337%38%
1604
16th to endDay
9%9%37%423446%45%
1580
March1st to 15thDay
10%7%45%424346%46%
1878
16th to endDay
15%9%35%43445%7%35%
2110
April1st to 15thDay
15%7%24432346%44%
2140
16th to endDay
22%7%24323346%36%
2340
May1st to 15thDay
13%6%245%35%446%42%
2331
16th to endDay
16%6%25%4235%46%41%
2446
June1st to 15thDay
14%5%2442345%8%44%
2520
16th to endDay
5%31332346%9%56%
2520
July1st to 15thDay
6%3233245%6%9%52%
2520
16th to endDay
5%2132245%5%8%57%
2572
August1st to 15thDay
7%5%245%35%5%7%9%43%
2340
16th to endDay
8%32432445%7%53%
2455
September1st to 15thDay
12%32241345%6%52%
2037
16th to endDay
9%31321225%6%60%
1980
October1st to 15thDay
15%5%2322333453%
1893
16th to endDay
14%6%13312345%53%
1667
November1st to 15thDay
6%5%2442445%5%53%
1583
16th to endDay
8%8%35%6%24446%45%
1580
December1st to 15thDay
11%10%26%433435%43%
1407
16th to endDay
11%9%47%5%24437%38%
1482
January1st to 15thNight
6%6%36%6%445%5%7%41%
2506
16th to endNight
7%9%36%5%23447%43%
2596
February1st to 15thNight
13%9%37%5%35%445%38%
2257
16th to endNight
8%6%35%6%24446%47%
1894
March1st to 15thNight
10%7%15%5%2445%7%46%
2082
16th to endNight
12%7%35%42445%6%42%
2112
April1st to 15thNight
12%7%25%32435%7%45%
1806
16th to endNight
17%6%25%424346%41%
1620
May1st to 15thNight
15%423324437%47%
1619
16th to endNight
15%41442445%7%44%
1665
June1st to 15thNight
12%42422436%8%48%
1419
16th to endNight
421232345%7%62%
1438
July1st to 15thNight
5%21333346%9%55%
1440
16th to endNight
321331346%10%58%
1593
August1st to 15thNight
34135%35%6%5%8%52%
1620
16th to endNight
6%312323447%59%
1746
September1st to 15thNight
8%313313446%59%
1923
16th to endNight
9%312312235%62%
1980
October1st to 15thNight
15%5%23213335%54%
2054
16th to endNight
12%41332335%6%54%
2225
November1st to 15thNight
7%5%24323446%56%
2275
16th to endNight
7%5%25%42345%7%49%
2377
December1st to 15thNight
10%9%36%5%24446%42%
2550
16th to endNight
9%11%46%5%34446%41%
2739

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
42%416%22%12%
1433
16th to endDay
43%418%19%12%1
1626
February1st to 15thDay
47%416%21%8%1
1605
16th to endDay
41%5%16%22%10%3
1580
March1st to 15thDay
39%5%12%25%15%1
1878
16th to endDay
48%6%13%20%9%
2112
April1st to 15thDay
41%412%29%11%1
2140
16th to endDay
47%5%12%22%11%
2340
May1st to 15thDay
42%5%12%24%14%
2331
16th to endDay
42%6%14%23%12%
2450
June1st to 15thDay
37%6%16%26%11%1
2520
16th to endDay
24%5%16%32%16%3
2520
July1st to 15thDay
27%6%15%29%16%4
2371
16th to endDay
22%5%13%32%20%5%
2412
August1st to 15thDay
35%7%14%27%11%2
2326
16th to endDay
29%412%31%16%4
2455
September1st to 15thDay
31%412%27%19%4
2037
16th to endDay
25%410%34%23%1
1980
October1st to 15thDay
34%310%26%21%3
1893
16th to endDay
33%313%31%16%2
1667
November1st to 15thDay
31%415%25%20%2
1583
16th to endDay
39%413%26%13%1
1580
December1st to 15thDay
43%415%23%11%2
1407
16th to endDay
48%413%23%9%1
1482
January1st to 15thNight
40%5%15%24%12%1
2506
16th to endNight
40%415%25%12%1
2596
February1st to 15thNight
48%415%19%10%1
2267
16th to endNight
36%414%27%11%4
1894
March1st to 15thNight
37%414%24%17%2
2082
16th to endNight
41%5%15%24%11%1
2112
April1st to 15thNight
38%412%29%12%1
1806
16th to endNight
44%5%12%20%15%1
1620
May1st to 15thNight
37%5%13%25%18%1
1620
16th to endNight
39%6%15%23%12%1
1667
June1st to 15thNight
33%6%16%25%13%2
1419
16th to endNight
21%5%13%35%19%4
1438
July1st to 15thNight
25%5%14%28%18%7%
1360
16th to endNight
18%6%16%27%25%5%
1491
August1st to 15thNight
28%7%16%29%15%3
1610
16th to endNight
23%5%13%29%22%5%
1746
September1st to 15thNight
26%411%29%22%5%
1923
16th to endNight
25%310%32%26%2
1980
October1st to 15thNight
34%38%24%24%3
2054
16th to endNight
31%5%13%26%21%2
2225
November1st to 15thNight
29%310%25%25%5%
2275
16th to endNight
32%415%28%16%2
2377
December1st to 15thNight
42%5%14%25%10%1
2550
16th to endNight
44%5%14%22%12%1
2739

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
14%13%36%27%6%1
90
16th to endDay
20%5%46%21%5%
96
February1st to 15thDay
16%7%54%15%5%
90
16th to endDay
16%18%28%23%8%4
81
March1st to 15thDay
13%10%36%34%32
90
16th to endDay
28%9%27%16%17%1
96
April1st to 15thDay
18%13%40%22%5%
259
16th to endDay
29%11%29%20%6%2
450
May1st to 15thDay
16%12%33%25%11%
468
16th to endDay
22%5%32%28%8%1
517
June1st to 15thDay
14%431%31%15%3
495
16th to endDay
6%6%32%38%15%1
495
July1st to 15thDay
8%225%39%21%2
475
16th to endDay
6%226%46%16%2
515
August1st to 15thDay
6%229%39%19%2
493
16th to endDay
10%227%37%19%3
495
September1st to 15thDay
10%436%28%14%5%
192
16th to endDay
20%235%24%14%2
135
October1st to 15thDay
21%6%30%27%13%
135
16th to endDay
14%6%29%35%9%6%
99
November1st to 15thDay
8%227%37%17%5%
90
16th to endDay
34%15%20%21%8%
90
December1st to 15thDay
30%17%34%11%42
90
16th to endDay
26%14%40%15%3
96
January1st to 15thNight
9%12%42%28%6%
900
16th to endNight
11%10%44%27%5%
960
February1st to 15thNight
17%11%39%25%5%
859
16th to endNight
12%9%41%27%8%1
632
March1st to 15thNight
14%10%39%30%4
642
16th to endNight
16%9%40%25%7%
576
April1st to 15thNight
16%7%41%30%3
539
16th to endNight
19%11%33%26%8%
540
May1st to 15thNight
17%8%35%28%8%
540
16th to endNight
17%5%36%30%10%
563
June1st to 15thNight
15%432%35%12%
540
16th to endNight
5%327%49%14%
540
July1st to 15thNight
6%322%46%19%
510
16th to endNight
4123%56%14%
564
August1st to 15thNight
5%123%49%19%
539
16th to endNight
7%128%44%17%
573
September1st to 15thNight
9%329%41%15%1
540
16th to endNight
10%6%30%35%14%2
537
October1st to 15thNight
20%9%31%29%9%
614
16th to endNight
15%6%33%34%9%
809
November1st to 15thNight
11%10%36%33%6%1
875
16th to endNight
11%10%39%28%9%
900
December1st to 15thNight
16%14%38%26%4
900
16th to endNight
15%11%35%28%8%
960
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Copyright 2017 A. Danko


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