Cane Creek State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cane Creek State Park clear sky chart from 2005-11-05 to 2017-09-23.

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
51%
15601
26%
47098
19%
15557
58%
15557
33%
27713

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
31%
898
27%
2327
10%
895
42%
895
31%
1492
January16th to endNight
28%
960
26%
2496
9%
960
40%
960
31%
1643
February1st to 15thNight
28%
810
21%
2218
8%
807
37%
807
28%
1433
February16th to endNight
28%
631
27%
1893
10%
631
40%
631
27%
1161
March1st to 15thNight
34%
546
22%
1986
14%
546
43%
546
23%
1215
March16th to endNight
38%
576
22%
2091
18%
576
48%
576
27%
1219
April1st to 15thNight
38%
539
25%
1797
17%
539
51%
539
32%
1012
April16th to endNight
42%
540
26%
1800
20%
540
55%
540
32%
1009
May1st to 15thNight
53%
540
21%
1800
19%
540
60%
540
30%
1044
May16th to endNight
58%
563
23%
1710
20%
561
64%
561
34%
1000
June1st to 15thNight
79%
540
24%
1449
21%
540
81%
540
48%
800
June16th to endNight
79%
540
26%
1530
25%
540
81%
540
46%
835
July1st to 15thNight
77%
510
19%
1530
21%
510
78%
510
35%
910
July16th to endNight
85%
564
26%
1594
29%
531
86%
531
44%
865
August1st to 15thNight
82%
539
23%
1712
29%
536
83%
536
40%
907
August16th to endNight
76%
573
24%
1910
30%
573
76%
573
31%
1123
September1st to 15thNight
69%
540
24%
1800
26%
540
71%
540
32%
1031
September16th to endNight
72%
593
33%
1867
31%
593
74%
593
39%
996
October1st to 15thNight
64%
660
32%
1980
26%
660
67%
660
42%
1055
October16th to endNight
55%
704
36%
2112
27%
704
64%
704
42%
1112
November1st to 15thNight
50%
700
30%
2100
21%
700
58%
700
37%
1189
November16th to endNight
41%
720
29%
2335
21%
720
52%
720
31%
1370
December1st to 15thNight
37%
855
22%
2475
12%
855
45%
855
27%
1584
December16th to endNight
33%
960
23%
2586
11%
960
41%
960
28%
1708

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%43%
47781
Night
11%42442345%7%50%
47296
TransparencyDay
38%6%10%21%18%4
47482
Night
33%5%10%22%21%7%
47100
SeeingDay
11%417%26%26%12%
5666
Night
13%5%24%31%21%3
15603

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
17%7%25%32343445%
1611
16th to endDay
18%6%2441333446%
1728
February1st to 15thDay
16%6%25%422325%47%
1642
16th to endDay
16%7%36%414335%42%
1583
March1st to 15thDay
17%5%36%424345%41%
1980
16th to endDay
11%6%45%5%25%447%42%
2129
April1st to 15thDay
10%425%5%3445%6%46%
2151
16th to endDay
11%5%35%5%35%346%45%
2160
May1st to 15thDay
15%6%45%6%3435%5%39%
2151
16th to endDay
7%5%26%6%36%7%7%9%36%
2400
June1st to 15thDay
5%335%6%46%6%6%9%42%
2505
16th to endDay
5%225%5%36%6%8%10%42%
2422
July1st to 15thDay
6%425%6%36%8%9%11%33%
2340
16th to endDay
6%425%6%37%8%8%9%36%
2466
August1st to 15thDay
6%3246%46%7%7%9%40%
2237
16th to endDay
10%325%5%36%6%6%9%38%
2292
September1st to 15thDay
10%5%25%5%35%6%48%41%
2160
16th to endDay
10%323425%5%5%7%48%
1915
October1st to 15thDay
9%6%24423346%52%
1650
16th to endDay
15%31221213460%
1760
November1st to 15thDay
10%41441234458%
1758
16th to endDay
15%5%35%5%23335%47%
1623
December1st to 15thDay
17%7%25%32435%441%
1483
16th to endDay
15%7%35%6%33335%41%
1635
January1st to 15thNight
16%6%25%31333449%
2327
16th to endNight
17%7%2431344447%
2496
February1st to 15thNight
16%5%25%422335%46%
2209
16th to endNight
16%5%24413345%49%
1893
March1st to 15thNight
15%5%25%4235%46%43%
1986
16th to endNight
14%5%23423345%49%
2091
April1st to 15thNight
9%2234245%5%8%50%
1797
16th to endNight
9%424434247%52%
1800
May1st to 15thNight
10%5%2342445%7%49%
1799
16th to endNight
8%42342446%9%49%
1710
June1st to 15thNight
32124235%7%11%55%
1449
16th to endNight
321332446%10%55%
1530
July1st to 15thNight
5%2145%45%6%7%10%45%
1620
16th to endNight
211343447%12%53%
1702
August1st to 15thNight
3213435%5%7%12%51%
1722
16th to endNight
7%414435%5%7%10%44%
1910
September1st to 15thNight
10%41441445%8%49%
1800
16th to endNight
8%32232445%7%56%
1867
October1st to 15thNight
9%31331345%6%57%
1980
16th to endNight
12%31221123462%
2112
November1st to 15thNight
9%42332435%5%55%
2100
16th to endNight
14%6%2332333452%
2335
December1st to 15thNight
16%6%24313445%45%
2475
16th to endNight
16%8%25%412345%45%
2586

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%35%21%21%5%
1612
16th to endDay
41%26%22%22%4
1728
February1st to 15thDay
40%36%24%18%5%
1644
16th to endDay
44%48%19%18%5%
1583
March1st to 15thDay
45%49%18%16%5%
1980
16th to endDay
41%5%11%23%15%1
2131
April1st to 15thDay
37%5%9%21%19%5%
2151
16th to endDay
39%5%8%20%22%3
2160
May1st to 15thDay
46%5%9%15%18%5%
2151
16th to endDay
39%8%17%22%10%1
2404
June1st to 15thDay
35%8%10%26%17%
2505
16th to endDay
32%9%13%22%18%3
2422
July1st to 15thDay
35%12%15%21%11%2
2201
16th to endDay
35%11%13%24%12%1
2311
August1st to 15thDay
35%8%16%21%14%2
2223
16th to endDay
39%9%15%20%12%3
2292
September1st to 15thDay
38%8%12%18%16%6%
2160
16th to endDay
31%6%10%21%20%9%
1915
October1st to 15thDay
32%48%19%23%11%
1650
16th to endDay
29%2419%30%13%
1760
November1st to 15thDay
30%37%21%29%7%
1758
16th to endDay
40%36%18%25%6%
1623
December1st to 15thDay
45%5%8%18%14%7%
1483
16th to endDay
47%210%18%16%4
1635
January1st to 15thNight
39%36%20%24%6%
2327
16th to endNight
39%46%19%22%7%
2496
February1st to 15thNight
41%37%20%21%5%
2218
16th to endNight
37%46%23%19%8%
1893
March1st to 15thNight
41%49%17%17%8%
1986
16th to endNight
37%49%22%22%3
2091
April1st to 15thNight
31%5%9%22%21%9%
1797
16th to endNight
32%48%24%24%5%
1800
May1st to 15thNight
33%5%10%23%20%5%
1800
16th to endNight
31%6%16%25%18%1
1712
June1st to 15thNight
21%6%15%31%22%1
1449
16th to endNight
22%6%13%28%25%3
1530
July1st to 15thNight
29%9%16%28%12%3
1530
16th to endNight
22%7%17%31%18%2
1594
August1st to 15thNight
23%7%21%26%16%3
1712
16th to endNight
31%8%14%23%17%3
1910
September1st to 15thNight
31%6%13%22%18%7%
1800
16th to endNight
26%5%8%22%25%11%
1867
October1st to 15thNight
26%310%20%24%14%
1980
16th to endNight
26%25%18%29%16%
2112
November1st to 15thNight
30%37%20%26%11%
2100
16th to endNight
36%35%16%29%9%
2335
December1st to 15thNight
40%49%20%17%7%
2475
16th to endNight
41%38%21%19%5%
2586

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
18%11%41%16%11%1
90
16th to endDay
13%19%52%9%41
96
February1st to 15thDay
10%17%47%16%5%2
90
16th to endDay
19%11%41%23%3
81
March1st to 15thDay
28%14%37%16%2
90
16th to endDay
7%16%28%36%10%
115
April1st to 15thDay
11%13%35%25%12%1
270
16th to endDay
14%8%27%29%16%2
270
May1st to 15thDay
14%7%28%30%15%3
288
16th to endDay
9%5%21%34%22%7%
487
June1st to 15thDay
6%110%34%35%11%
495
16th to endDay
6%13%31%33%13%
495
July1st to 15thDay
7%9%32%34%15%
475
16th to endDay
5%420%38%29%
515
August1st to 15thDay
10%5%18%43%20%
390
16th to endDay
14%5%20%36%22%
332
September1st to 15thDay
12%18%18%33%25%
315
16th to endDay
10%7%26%35%20%
220
October1st to 15thDay
4127%31%28%6%
90
16th to endDay
18%214%38%20%5%
96
November1st to 15thDay
16%423%37%13%4
90
16th to endDay
24%8%34%20%8%3
90
December1st to 15thDay
27%430%22%11%4
90
16th to endDay
17%19%34%21%5%1
96
January1st to 15thNight
19%10%34%28%7%
900
16th to endNight
19%8%41%27%3
960
February1st to 15thNight
20%9%38%26%5%
810
16th to endNight
17%13%37%28%2
631
March1st to 15thNight
20%8%33%32%5%
546
16th to endNight
17%7%31%31%10%
576
April1st to 15thNight
10%9%39%29%11%
539
16th to endNight
12%6%35%32%12%1
540
May1st to 15thNight
13%424%42%14%1
540
16th to endNight
10%123%36%25%3
563
June1st to 15thNight
49%39%41%5%
540
16th to endNight
37%34%47%6%
540
July1st to 15thNight
5%5%32%48%7%
510
16th to endNight
2228%52%13%
564
August1st to 15thNight
5%428%48%13%
539
16th to endNight
9%427%48%8%
573
September1st to 15thNight
11%110%30%37%9%
540
16th to endNight
10%29%31%40%5%
593
October1st to 15thNight
10%316%36%29%4
660
16th to endNight
13%422%33%22%2
704
November1st to 15thNight
10%6%29%32%20%1
700
16th to endNight
16%6%31%27%15%1
720
December1st to 15thNight
20%9%27%32%9%
855
16th to endNight
21%9%31%30%6%
960
Page generated at 2017-09-24 08:15:50. Version ac04

Copyright 2017 A. Danko


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