Village Creek State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Village Creek State Park clear sky chart from 2005-11-05 to 2017-09-24.

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
48%
15668
25%
46982
18%
15622
56%
15622
33%
27772

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
26%
2355
9%
895
40%
895
28%
1527
January16th to endNight
27%
960
26%
2496
9%
960
38%
960
29%
1627
February1st to 15thNight
27%
782
20%
2189
8%
779
36%
779
26%
1396
February16th to endNight
28%
631
26%
1893
11%
631
39%
631
28%
1156
March1st to 15thNight
30%
617
20%
2057
12%
617
38%
617
23%
1311
March16th to endNight
38%
576
21%
2052
15%
576
47%
576
24%
1245
April1st to 15thNight
35%
539
26%
1797
15%
539
50%
539
31%
1004
April16th to endNight
40%
540
26%
1800
19%
540
54%
540
32%
1008
May1st to 15thNight
49%
540
20%
1800
16%
540
57%
540
29%
1065
May16th to endNight
58%
563
24%
1569
19%
561
63%
561
34%
967
June1st to 15thNight
76%
540
26%
1440
22%
540
78%
540
47%
809
June16th to endNight
77%
540
27%
1440
23%
540
79%
540
47%
808
July1st to 15thNight
72%
510
20%
1418
17%
510
75%
510
39%
837
July16th to endNight
81%
564
24%
1594
26%
531
82%
531
43%
859
August1st to 15thNight
79%
539
24%
1736
28%
536
81%
536
43%
889
August16th to endNight
77%
573
25%
1910
30%
573
78%
573
33%
1078
September1st to 15thNight
68%
540
26%
1800
29%
540
70%
540
34%
1016
September16th to endNight
67%
630
34%
1851
29%
630
70%
630
40%
1054
October1st to 15thNight
61%
660
33%
1980
28%
660
65%
660
41%
1080
October16th to endNight
52%
704
34%
2112
24%
704
62%
704
39%
1155
November1st to 15thNight
49%
700
31%
2205
24%
700
59%
700
37%
1190
November16th to endNight
39%
720
27%
2340
18%
720
50%
720
29%
1378
December1st to 15thNight
34%
840
22%
2460
13%
840
43%
840
28%
1554
December16th to endNight
31%
960
22%
2688
10%
960
40%
960
26%
1759

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
12%5%25%5%3445%7%43%
47937
Night
11%424424347%50%
47175
TransparencyDay
38%5%11%22%17%4
47633
Night
34%410%23%21%5%
46984
SeeingDay
11%6%19%26%23%12%
5724
Night
14%6%24%31%19%3
15668

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
21%6%2431323446%
1581
16th to endDay
15%5%36%41423445%
1728
February1st to 15thDay
17%5%25%423235%45%
1672
16th to endDay
17%8%36%325%34439%
1580
March1st to 15thDay
21%6%44424335%38%
1914
16th to endDay
15%6%36%5%34447%38%
2170
April1st to 15thDay
12%6%245%2335%7%45%
2151
16th to endDay
13%6%245%3445%7%42%
2160
May1st to 15thDay
15%5%35%5%26%45%7%39%
2151
16th to endDay
9%5%35%6%45%6%6%9%38%
2539
June1st to 15thDay
43245%46%6%8%9%43%
2520
16th to endDay
43245%36%6%7%10%44%
2520
July1st to 15thDay
6%426%8%47%7%8%8%33%
2454
16th to endDay
6%315%436%6%7%11%42%
2466
August1st to 15thDay
6%3245%46%6%7%10%41%
2213
16th to endDay
9%416%5%35%6%7%11%38%
2292
September1st to 15thDay
10%425%5%35%5%6%9%40%
2160
16th to endDay
10%4144245%5%6%50%
1951
October1st to 15thDay
10%415%424346%52%
1650
16th to endDay
16%21321223458%
1760
November1st to 15thDay
12%6%2232223456%
1650
16th to endDay
17%5%24222346%48%
1620
December1st to 15thDay
18%8%25%423245%41%
1499
16th to endDay
18%7%45%423345%41%
1536
January1st to 15thNight
17%6%2432323448%
2355
16th to endNight
16%5%35%42333447%
2496
February1st to 15thNight
17%6%24323346%45%
2181
16th to endNight
14%6%24434225%49%
1893
March1st to 15thNight
16%6%25%5%2433444%
2057
16th to endNight
15%6%24425%435%46%
2052
April1st to 15thNight
10%42332445%8%50%
1797
16th to endNight
11%41442345%7%51%
1800
May1st to 15thNight
14%5%2332345%7%46%
1799
16th to endNight
6%425%5%35%5%5%8%47%
1568
June1st to 15thNight
32124345%7%9%55%
1440
16th to endNight
2223435%4410%56%
1440
July1st to 15thNight
33235%35%5%8%12%44%
1503
16th to endNight
4234245%6%11%52%
1702
August1st to 15thNight
322342346%11%54%
1746
16th to endNight
6%3145%35%6%7%10%46%
1910
September1st to 15thNight
10%5%1342335%8%50%
1800
16th to endNight
6%5%1332435%7%55%
1851
October1st to 15thNight
8%314323448%55%
1980
16th to endNight
13%31321323460%
2112
November1st to 15thNight
9%323323346%55%
2205
16th to endNight
16%5%2331334450%
2340
December1st to 15thNight
17%7%24323235%46%
2460
16th to endNight
19%6%25%313335%44%
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
43%26%25%17%4
1582
16th to endDay
42%310%23%18%2
1728
February1st to 15thDay
43%211%23%16%2
1674
16th to endDay
48%37%19%17%3
1580
March1st to 15thDay
49%39%18%14%4
1914
16th to endDay
45%412%24%11%
2172
April1st to 15thDay
38%5%8%24%19%3
2151
16th to endDay
39%6%8%23%19%2
2160
May1st to 15thDay
44%6%12%16%18%2
2151
16th to endDay
40%7%15%22%11%2
2543
June1st to 15thDay
32%9%12%26%17%1
2520
16th to endDay
31%7%13%24%18%3
2520
July1st to 15thDay
40%9%14%21%10%3
2310
16th to endDay
32%7%15%25%15%2
2311
August1st to 15thDay
32%8%16%22%16%3
2199
16th to endDay
36%6%15%24%13%3
2292
September1st to 15thDay
37%8%11%20%15%7%
2160
16th to endDay
32%5%8%21%24%7%
1951
October1st to 15thDay
32%48%21%23%10%
1650
16th to endDay
30%2324%29%9%
1760
November1st to 15thDay
33%25%23%26%8%
1650
16th to endDay
38%39%21%22%5%
1620
December1st to 15thDay
45%39%23%14%4
1499
16th to endDay
45%49%20%16%4
1536
January1st to 15thNight
40%36%21%24%4
2355
16th to endNight
40%26%23%20%5%
2496
February1st to 15thNight
40%39%23%18%4
2190
16th to endNight
39%27%23%19%6%
1893
March1st to 15thNight
43%48%17%19%7%
2057
16th to endNight
40%410%23%18%2
2052
April1st to 15thNight
32%410%24%21%6%
1797
16th to endNight
32%410%25%24%3
1800
May1st to 15thNight
36%413%22%18%5%
1800
16th to endNight
33%6%15%22%18%3
1570
June1st to 15thNight
22%6%13%28%25%3
1440
16th to endNight
23%5%13%26%24%5%
1440
July1st to 15thNight
26%8%17%27%15%4
1418
16th to endNight
23%6%18%28%18%3
1594
August1st to 15thNight
23%5%17%29%21%2
1736
16th to endNight
29%7%14%25%17%4
1910
September1st to 15thNight
31%5%10%25%18%8%
1800
16th to endNight
28%5%8%22%25%9%
1851
October1st to 15thNight
26%48%23%24%12%
1980
16th to endNight
28%3420%31%11%
2112
November1st to 15thNight
29%26%23%27%10%
2205
16th to endNight
37%36%19%26%6%
2340
December1st to 15thNight
41%210%22%17%6%
2460
16th to endNight
44%29%20%19%3
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
28%18%33%13%14
90
16th to endDay
13%27%46%8%4
96
February1st to 15thDay
13%26%41%14%22
90
16th to endDay
18%24%34%18%3
81
March1st to 15thDay
35%13%32%17%1
90
16th to endDay
13%17%27%32%8%
156
April1st to 15thDay
14%14%31%25%12%1
270
16th to endDay
18%7%28%27%14%3
270
May1st to 15thDay
16%9%28%30%11%4
288
16th to endDay
12%425%26%21%8%
464
June1st to 15thDay
5%116%32%25%18%
495
16th to endDay
4215%35%29%12%
495
July1st to 15thDay
5%116%33%27%15%
475
16th to endDay
5%5%23%40%24%
515
August1st to 15thDay
9%26%25%37%19%
366
16th to endDay
14%2426%33%18%
332
September1st to 15thDay
10%110%20%35%22%
315
16th to endDay
9%211%26%31%19%
284
October1st to 15thDay
11%6%25%34%20%2
90
16th to endDay
16%427%27%19%5%
96
November1st to 15thDay
13%13%22%27%16%6%
90
16th to endDay
31%15%30%12%8%2
90
December1st to 15thDay
30%13%23%21%6%5%
90
16th to endDay
22%21%40%11%3
96
January1st to 15thNight
21%12%36%23%7%
900
16th to endNight
18%12%37%28%2
960
February1st to 15thNight
20%12%35%26%4
782
16th to endNight
16%14%36%27%3
631
March1st to 15thNight
20%8%36%29%4
617
16th to endNight
17%8%32%31%9%
576
April1st to 15thNight
11%12%39%25%10%1
539
16th to endNight
13%6%35%32%11%1
540
May1st to 15thNight
17%5%23%38%12%3
540
16th to endNight
9%222%35%26%3
563
June1st to 15thNight
5%13%39%35%6%
540
16th to endNight
3111%40%39%4
540
July1st to 15thNight
410%35%40%8%
510
16th to endNight
5%428%47%13%
564
August1st to 15thNight
47%27%47%12%
539
16th to endNight
8%430%46%8%
573
September1st to 15thNight
11%211%29%38%7%
540
16th to endNight
9%213%34%34%6%
630
October1st to 15thNight
10%417%33%27%6%
660
16th to endNight
15%6%22%34%19%1
704
November1st to 15thNight
11%8%26%33%19%1
700
16th to endNight
19%7%31%28%12%
720
December1st to 15thNight
21%9%28%32%7%
840
16th to endNight
22%10%31%29%5%
960
Page generated at 2017-09-25 08:02:23. Version ac04

Copyright 2017 A. Danko


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