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 2019-06-10.

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
55%
17678
23%
53848
19%
17632
59%
17632
31%
32506

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
37%
1050
25%
2717
12%
1045
45%
1045
29%
1795
January16th to endNight
38%
1120
23%
2912
10%
1120
44%
1120
28%
1966
February1st to 15thNight
34%
989
21%
2638
10%
986
40%
986
25%
1815
February16th to endNight
31%
552
23%
2022
14%
552
41%
552
20%
1297
March1st to 15thNight
36%
630
23%
2310
17%
630
45%
630
20%
1485
March16th to endNight
45%
672
21%
2464
18%
672
51%
672
27%
1402
April1st to 15thNight
43%
629
24%
2203
19%
629
53%
629
25%
1321
April16th to endNight
47%
624
22%
2078
21%
624
53%
624
27%
1236
May1st to 15thNight
50%
629
19%
2090
20%
629
55%
629
28%
1249
May16th to endNight
65%
659
27%
1973
27%
657
71%
657
41%
1086
June1st to 15thNight
82%
612
21%
1836
24%
612
83%
612
47%
955
June16th to endNight
76%
585
15%
1755
18%
585
77%
585
31%
1080
July1st to 15thNight
79%
555
16%
1665
20%
555
79%
555
38%
953
July16th to endNight
84%
612
16%
1738
20%
579
84%
579
37%
987
August1st to 15thNight
90%
575
24%
1774
27%
572
90%
572
49%
879
August16th to endNight
76%
621
13%
2070
16%
621
76%
621
28%
1260
September1st to 15thNight
74%
585
15%
2045
18%
585
74%
585
27%
1217
September16th to endNight
75%
582
25%
2145
29%
582
75%
582
30%
1199
October1st to 15thNight
75%
770
31%
2330
27%
770
76%
770
45%
1211
October16th to endNight
62%
832
35%
2496
27%
832
67%
832
43%
1332
November1st to 15thNight
57%
820
27%
2460
22%
820
60%
820
34%
1425
November16th to endNight
52%
840
32%
2520
24%
840
59%
840
35%
1453
December1st to 15thNight
41%
1015
26%
2695
14%
1015
48%
1015
27%
1804
December16th to endNight
34%
1120
18%
2912
10%
1120
38%
1120
22%
2099

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%5%25%5%35%5%5%7%36%
54657
Night
12%5%2442345%8%46%
54043
TransparencyDay
44%6%10%17%15%5%
54357
Night
35%5%13%20%16%8%
53848
SeeingDay
13%415%24%25%15%
7612
Night
14%418%31%25%4
17679

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
18%5%25%423445%43%
1881
16th to endDay
21%6%245%2333443%
2016
February1st to 15thDay
22%8%35%5%2344436%
1895
16th to endDay
25%7%25%423335%35%
2024
March1st to 15thDay
24%7%25%423335%36%
2310
16th to endDay
15%7%35%434346%40%
2462
April1st to 15thDay
16%6%36%434446%39%
2404
16th to endDay
14%5%26%5%345%5%7%38%
2487
May1st to 15thDay
13%6%36%5%26%6%5%8%33%
2517
16th to endDay
8%436%7%46%6%7%9%35%
2846
June1st to 15thDay
6%436%7%5%7%8%8%9%31%
2653
16th to endDay
8%5%37%7%5%10%7%8%10%24%
2535
July1st to 15thDay
10%436%8%5%7%8%8%10%25%
2535
16th to endDay
9%425%8%5%8%8%8%10%27%
2674
August1st to 15thDay
4326%5%5%8%7%8%11%35%
2427
16th to endDay
11%5%27%8%5%8%7%7%7%28%
2484
September1st to 15thDay
12%5%26%5%46%7%6%9%32%
2240
16th to endDay
11%6%26%7%46%6%7%7%34%
2142
October1st to 15thDay
7%4245%35%45%7%48%
1950
16th to endDay
13%324322345%54%
2080
November1st to 15thDay
12%5%25%5%35%45%5%43%
2058
16th to endDay
14%5%145%2333449%
2100
December1st to 15thDay
19%8%36%423336%38%
1921
16th to endDay
22%9%35%423445%32%
2016
January1st to 15thNight
18%7%34323236%44%
2717
16th to endNight
19%6%34423246%42%
2912
February1st to 15thNight
20%7%44423346%39%
2628
16th to endNight
20%7%25%423345%39%
2022
March1st to 15thNight
20%7%34423335%40%
2310
16th to endNight
12%6%2442345%7%47%
2464
April1st to 15thNight
13%6%25%42345%9%43%
2203
16th to endNight
13%5%2432445%7%45%
2078
May1st to 15thNight
11%5%25%4345%6%8%42%
2089
16th to endNight
7%31242446%10%53%
1971
June1st to 15thNight
22133235%6%11%56%
1836
16th to endNight
6%423426%6%7%12%42%
1755
July1st to 15thNight
6%32343346%13%49%
1755
16th to endNight
3223335%5%7%14%47%
1846
August1st to 15thNight
21223347%13%57%
1784
16th to endNight
8%3245%35%5%7%12%41%
2070
September1st to 15thNight
9%415%435%5%6%10%43%
2045
16th to endNight
7%42443445%7%49%
2145
October1st to 15thNight
6%21232345%6%60%
2330
16th to endNight
12%312212335%61%
2496
November1st to 15thNight
9%414433447%51%
2460
16th to endNight
12%5%15%423345%53%
2520
December1st to 15thNight
17%8%3442335%6%40%
2695
16th to endNight
22%8%25%5%33345%35%
2912

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%45%17%20%9%
1882
16th to endDay
44%35%15%19%10%
2016
February1st to 15thDay
51%3414%17%8%
1896
16th to endDay
52%36%13%15%8%
2024
March1st to 15thDay
51%37%12%19%6%
2310
16th to endDay
44%48%16%21%6%
2464
April1st to 15thDay
44%37%17%17%9%
2404
16th to endDay
43%5%9%15%18%6%
2487
May1st to 15thDay
45%5%12%17%13%6%
2517
16th to endDay
41%7%11%21%15%2
2850
June1st to 15thDay
43%7%13%18%15%1
2653
16th to endDay
49%9%15%16%9%
2535
July1st to 15thDay
46%10%17%18%6%
2396
16th to endDay
45%10%19%21%2
2519
August1st to 15thDay
37%9%19%24%7%
2413
16th to endDay
48%10%16%15%6%1
2484
September1st to 15thDay
46%9%14%15%10%3
2240
16th to endDay
44%6%11%17%14%4
2142
October1st to 15thDay
34%410%21%16%12%
1950
16th to endDay
32%2414%29%16%
2080
November1st to 15thDay
40%39%18%17%8%
2058
16th to endDay
38%2416%24%12%
2100
December1st to 15thDay
47%38%17%15%7%
1921
16th to endDay
53%45%16%14%5%
2016
January1st to 15thNight
42%25%16%21%11%
2717
16th to endNight
44%25%16%18%12%
2912
February1st to 15thNight
47%36%13%18%10%
2638
16th to endNight
46%36%16%15%11%
2022
March1st to 15thNight
47%37%13%18%9%
2310
16th to endNight
36%413%16%22%6%
2464
April1st to 15thNight
38%48%20%16%10%
2203
16th to endNight
38%410%19%18%8%
2078
May1st to 15thNight
37%5%15%18%16%7%
2090
16th to endNight
25%6%15%31%17%2
1973
June1st to 15thNight
20%6%20%32%19%1
1836
16th to endNight
31%11%21%25%10%
1755
July1st to 15thNight
27%8%31%25%7%
1665
16th to endNight
24%10%32%26%5%
1738
August1st to 15thNight
16%8%29%36%8%
1774
16th to endNight
33%10%28%18%7%1
2070
September1st to 15thNight
33%9%22%20%9%4
2045
16th to endNight
32%6%15%20%17%7%
2145
October1st to 15thNight
23%411%28%17%13%
2330
16th to endNight
27%26%15%28%19%
2496
November1st to 15thNight
32%413%20%21%7%
2460
16th to endNight
33%26%17%24%15%
2520
December1st to 15thNight
44%37%19%15%9%
2695
16th to endNight
51%35%14%16%8%
2912

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
20%5%30%27%15%1
180
16th to endDay
16%11%39%22%9%
192
February1st to 15thDay
28%15%29%22%4
180
16th to endDay
27%14%34%20%3
159
March1st to 15thDay
25%15%38%16%5%
180
16th to endDay
15%8%33%31%7%2
192
April1st to 15thDay
17%17%20%29%14%1
283
16th to endDay
19%7%21%28%20%2
379
May1st to 15thDay
15%423%31%22%1
414
16th to endDay
9%321%35%23%6%
677
June1st to 15thDay
8%17%35%33%13%
616
16th to endDay
11%26%23%34%21%
570
July1st to 15thDay
7%1422%35%28%
550
16th to endDay
7%1317%36%33%
595
August1st to 15thDay
5%115%42%34%
490
16th to endDay
13%1310%32%38%
396
September1st to 15thDay
10%415%38%29%
275
16th to endDay
16%118%38%25%
180
October1st to 15thDay
6%10%34%27%20%
180
16th to endDay
20%220%26%21%8%
192
November1st to 15thDay
17%6%20%31%22%1
180
16th to endDay
15%7%27%32%12%4
180
December1st to 15thDay
26%328%23%12%5%
180
16th to endDay
28%9%33%21%5%1
192
January1st to 15thNight
21%430%31%11%
1050
16th to endNight
20%8%27%35%8%
1120
February1st to 15thNight
24%7%28%32%6%
989
16th to endNight
23%5%33%32%3
552
March1st to 15thNight
24%6%28%34%5%
630
16th to endNight
15%5%29%37%12%
672
April1st to 15thNight
14%8%29%36%10%
629
16th to endNight
17%5%24%37%14%
624
May1st to 15thNight
12%426%41%15%
630
16th to endNight
7%317%40%28%2
659
June1st to 15thNight
4439%46%4
612
16th to endNight
7%25%26%49%8%
585
July1st to 15thNight
5%1123%50%17%
555
16th to endNight
31119%56%17%
612
August1st to 15thNight
317%61%16%
575
16th to endNight
8%1114%58%14%
621
September1st to 15thNight
9%1419%51%13%
585
16th to endNight
8%1425%50%9%
582
October1st to 15thNight
6%29%33%41%6%
770
16th to endNight
13%216%35%28%3
832
November1st to 15thNight
12%319%36%24%2
820
16th to endNight
13%5%23%36%19%1
840
December1st to 15thNight
21%6%24%34%13%
1015
16th to endNight
26%7%25%31%9%
1120
Page generated at 2019-06-10 18:29:50. Version ac04

Copyright 2019 A. Danko


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