Canoe Creek State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Canoe 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
37%
17364
17%
53926
11%
17324
44%
17324
20%
35755

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
21%
837
15%
2821
6%
836
32%
836
11%
2007
January16th to endNight
18%
896
14%
2912
4%
896
30%
896
12%
2085
February1st to 15thNight
19%
824
14%
2677
7%
821
29%
821
12%
1886
February16th to endNight
20%
735
15%
2286
4%
735
32%
735
13%
1631
March1st to 15thNight
25%
840
19%
2310
9%
840
35%
840
18%
1596
March16th to endNight
25%
896
19%
2464
9%
896
34%
896
22%
1629
April1st to 15thNight
27%
838
15%
2100
5%
838
33%
838
20%
1529
April16th to endNight
35%
775
18%
2021
7%
775
40%
775
24%
1368
May1st to 15thNight
42%
620
16%
1880
10%
620
47%
620
21%
1297
May16th to endNight
50%
438
16%
1753
16%
438
55%
438
19%
1084
June1st to 15thNight
49%
408
18%
1632
18%
408
58%
408
23%
955
June16th to endNight
55%
390
17%
1560
18%
390
63%
390
26%
863
July1st to 15thNight
55%
370
16%
1480
20%
370
58%
370
24%
860
July16th to endNight
66%
600
17%
1727
14%
567
69%
567
35%
1012
August1st to 15thNight
65%
575
18%
1715
13%
572
68%
572
36%
1011
August16th to endNight
66%
757
22%
1999
15%
757
67%
757
37%
1228
September1st to 15thNight
54%
780
24%
1950
14%
780
57%
780
32%
1285
September16th to endNight
54%
777
23%
2164
19%
777
57%
777
30%
1372
October1st to 15thNight
45%
780
19%
2340
17%
780
51%
780
25%
1507
October16th to endNight
35%
832
22%
2496
13%
832
48%
832
23%
1612
November1st to 15thNight
40%
820
21%
2623
16%
820
49%
820
24%
1666
November16th to endNight
29%
840
17%
2940
11%
840
39%
840
14%
1972
December1st to 15thNight
26%
840
13%
2940
6%
840
34%
840
12%
2091
December16th to endNight
22%
896
13%
3136
5%
896
32%
896
11%
2209

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
15%7%36%6%35%5%5%7%33%
54569
Night
14%6%25%5%3445%7%37%
54108
Cloud CoverDay
15%7%36%6%35%5%5%7%33%
54579
Night
14%7%25%5%3445%7%37%
54112
TransparencyDay
49%5%11%20%11%1
54269
Night
45%5%12%22%12%1
53926
SeeingDay
24%13%23%20%12%5%
7706
Night
20%11%23%29%13%1
17368

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
12%9%410%7%45%45%7%27%
1773
16th to endDay
13%14%5%9%8%35%5%5%5%23%
2016
February1st to 15thDay
15%13%6%8%6%45%446%24%
1845
16th to endDay
14%10%410%6%35%5%45%27%
1756
March1st to 15thDay
15%9%47%7%36%5%45%30%
2299
16th to endDay
17%9%47%6%34347%32%
2464
April1st to 15thDay
16%9%5%6%6%345%46%31%
2507
16th to endDay
19%6%36%435%445%36%
2554
May1st to 15thDay
20%7%26%6%345%5%6%30%
2727
16th to endDay
16%5%25%5%45%5%5%8%35%
3066
June1st to 15thDay
14%5%25%6%35%5%6%8%35%
2856
16th to endDay
13%425%6%45%5%6%10%34%
2730
July1st to 15thDay
9%5%35%6%47%5%5%7%36%
2730
16th to endDay
10%5%36%6%36%6%6%9%36%
2683
August1st to 15thDay
11%6%26%5%46%6%8%10%30%
2487
16th to endDay
13%5%246%35%5%6%8%38%
2542
September1st to 15thDay
18%5%345%2435%7%39%
2340
16th to endDay
16%5%25%5%245%5%6%41%
2122
October1st to 15thDay
18%6%26%5%3445%6%35%
1950
16th to endDay
14%7%36%6%35%45%6%37%
2080
November1st to 15thDay
13%6%36%445%5%5%7%38%
1890
16th to endDay
18%8%26%6%35%45%5%31%
1680
December1st to 15thDay
16%10%5%10%6%35%45%6%25%
1680
16th to endDay
17%12%48%7%45%45%6%22%
1792
January1st to 15thNight
15%8%38%6%45%45%7%28%
2821
16th to endNight
13%10%38%6%35%5%6%6%29%
2912
February1st to 15thNight
14%9%46%6%36%5%5%8%28%
2675
16th to endNight
13%8%36%6%45%6%6%6%31%
2286
March1st to 15thNight
14%6%35%6%345%5%8%35%
2298
16th to endNight
16%7%244235%47%41%
2464
April1st to 15thNight
15%8%37%5%35%45%6%34%
2100
16th to endNight
15%5%26%434447%40%
2021
May1st to 15thNight
18%6%25%5%25%45%8%36%
1880
16th to endNight
13%5%344345%6%8%40%
1751
June1st to 15thNight
12%324435%5%5%9%43%
1632
16th to endNight
10%324335%46%9%46%
1560
July1st to 15thNight
8%425%5%2445%8%47%
1560
16th to endNight
7%3235%245%7%10%46%
1834
August1st to 15thNight
7%42432446%11%46%
1726
16th to endNight
11%31342345%8%50%
1999
September1st to 15thNight
16%424424446%46%
1950
16th to endNight
14%41443345%6%46%
2164
October1st to 15thNight
18%6%13423448%42%
2340
16th to endNight
17%5%2443445%8%39%
2496
November1st to 15thNight
14%6%25%5%2335%7%42%
2623
16th to endNight
16%7%26%6%35%5%5%7%33%
2940
December1st to 15thNight
15%8%37%7%36%5%6%8%27%
2940
16th to endNight
16%10%36%7%35%46%8%28%
3136

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
13%9%49%8%36%5%5%6%27%
1773
16th to endDay
12%15%5%8%7%46%45%5%23%
2016
February1st to 15thDay
15%12%6%8%6%45%45%6%23%
1845
16th to endDay
14%10%410%7%35%446%27%
1756
March1st to 15thDay
15%9%47%5%45%446%30%
2310
16th to endDay
17%8%46%6%3435%7%32%
2463
April1st to 15thDay
15%9%5%6%6%35%5%5%6%31%
2507
16th to endDay
20%6%26%434446%37%
2554
May1st to 15thDay
20%6%36%5%35%5%5%6%30%
2727
16th to endDay
16%5%25%5%46%5%5%7%35%
3066
June1st to 15thDay
14%5%25%5%36%5%6%8%35%
2856
16th to endDay
13%425%6%45%5%6%10%34%
2730
July1st to 15thDay
9%6%36%6%46%5%5%7%37%
2730
16th to endDay
9%5%36%5%46%6%7%9%35%
2683
August1st to 15thDay
11%6%26%6%46%7%7%10%30%
2487
16th to endDay
13%5%15%5%35%5%7%8%38%
2542
September1st to 15thDay
18%5%2443425%7%39%
2340
16th to endDay
15%5%15%5%2445%7%41%
2122
October1st to 15thDay
18%7%35%5%34447%35%
1950
16th to endDay
14%7%36%5%35%45%6%37%
2080
November1st to 15thDay
12%5%36%5%35%45%7%38%
1890
16th to endDay
19%8%36%6%345%5%6%31%
1680
December1st to 15thDay
16%10%6%8%6%36%5%45%26%
1680
16th to endDay
17%12%48%6%35%5%47%22%
1792
January1st to 15thNight
15%8%38%7%36%45%7%28%
2821
16th to endNight
13%10%38%7%4445%6%30%
2912
February1st to 15thNight
14%9%5%7%7%36%5%5%8%29%
2668
16th to endNight
13%8%37%7%36%5%6%6%30%
2286
March1st to 15thNight
14%7%35%6%345%5%7%35%
2310
16th to endNight
16%7%25%433446%41%
2464
April1st to 15thNight
15%9%46%5%35%5%5%6%33%
2100
16th to endNight
15%5%25%5%34447%41%
2021
May1st to 15thNight
19%5%245%3445%8%35%
1879
16th to endNight
13%7%24425%46%8%40%
1751
June1st to 15thNight
12%424435%5%5%9%42%
1632
16th to endNight
10%31433446%10%46%
1560
July1st to 15thNight
8%426%425%45%9%46%
1560
16th to endNight
7%325%4245%8%10%46%
1834
August1st to 15thNight
6%5%245%2446%10%47%
1726
16th to endNight
11%41342435%8%50%
1999
September1st to 15thNight
16%425%423346%46%
1950
16th to endNight
13%5%15%423447%46%
2164
October1st to 15thNight
17%6%24423447%42%
2340
16th to endNight
17%5%2443445%8%40%
2496
November1st to 15thNight
13%7%25%433346%43%
2623
16th to endNight
16%8%36%5%245%5%7%33%
2940
December1st to 15thNight
15%8%47%6%45%5%5%8%27%
2940
16th to endNight
16%10%36%7%35%5%5%8%28%
3136

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
56%413%16%8%1
1774
16th to endDay
62%312%14%5%
2016
February1st to 15thDay
60%313%16%5%
1847
16th to endDay
58%411%17%7%
1756
March1st to 15thDay
55%412%19%8%
2310
16th to endDay
52%211%21%10%1
2464
April1st to 15thDay
53%5%10%17%12%1
2507
16th to endDay
48%48%19%15%3
2554
May1st to 15thDay
52%5%11%18%10%
2727
16th to endDay
47%5%15%19%10%1
3070
June1st to 15thDay
46%6%10%21%14%
2856
16th to endDay
43%6%13%23%11%
2730
July1st to 15thDay
44%6%10%19%15%3
2581
16th to endDay
41%6%13%22%14%1
2527
August1st to 15thDay
45%7%13%23%10%
2474
16th to endDay
41%6%10%24%14%2
2542
September1st to 15thDay
44%5%9%21%15%2
2340
16th to endDay
42%5%8%24%17%2
2122
October1st to 15thDay
48%5%11%21%12%1
1950
16th to endDay
46%313%24%12%
2080
November1st to 15thDay
44%413%20%12%4
1890
16th to endDay
52%413%20%8%
1680
December1st to 15thDay
59%414%16%5%
1680
16th to endDay
61%312%16%5%
1792
January1st to 15thNight
55%412%18%8%1
2821
16th to endNight
54%413%19%7%
2912
February1st to 15thNight
52%413%19%8%
2677
16th to endNight
52%5%10%20%11%
2286
March1st to 15thNight
46%5%12%22%11%
2310
16th to endNight
43%313%22%15%1
2464
April1st to 15thNight
50%411%19%13%
2100
16th to endNight
43%49%23%15%4
2021
May1st to 15thNight
46%6%11%20%12%1
1880
16th to endNight
41%7%13%22%13%1
1753
June1st to 15thNight
37%6%12%28%14%
1632
16th to endNight
33%6%16%25%16%1
1560
July1st to 15thNight
36%7%12%23%16%3
1480
16th to endNight
30%7%17%25%16%2
1727
August1st to 15thNight
31%5%18%26%16%1
1715
16th to endNight
31%6%12%28%17%3
1999
September1st to 15thNight
39%310%24%18%2
1950
16th to endNight
38%49%27%17%2
2164
October1st to 15thNight
41%5%12%24%14%1
2340
16th to endNight
43%310%29%12%
2496
November1st to 15thNight
42%312%23%14%4
2623
16th to endNight
49%412%20%11%1
2940
December1st to 15thNight
54%5%13%18%7%
2940
16th to endNight
53%416%19%5%
3136

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
33%23%28%9%32
149
16th to endDay
34%21%34%7%1
192
February1st to 15thDay
35%28%24%9%2
180
16th to endDay
32%24%29%12%
249
March1st to 15thDay
27%22%23%23%3
390
16th to endDay
28%17%27%16%7%2
416
April1st to 15thDay
32%18%20%18%7%1
390
16th to endDay
29%15%24%11%15%3
379
May1st to 15thDay
33%10%25%16%9%4
408
16th to endDay
22%14%24%18%11%7%
459
June1st to 15thDay
19%12%24%26%14%2
411
16th to endDay
18%12%22%27%16%3
375
July1st to 15thDay
13%5%27%25%18%9%
365
16th to endDay
12%421%30%19%10%
390
August1st to 15thDay
15%320%22%25%11%
358
16th to endDay
14%317%26%18%18%
396
September1st to 15thDay
24%414%19%22%14%
375
16th to endDay
22%6%16%22%18%13%
374
October1st to 15thDay
25%8%16%25%17%5%
375
16th to endDay
19%21%26%19%11%
400
November1st to 15thDay
23%12%23%26%14%
307
16th to endDay
28%22%31%10%5%1
120
December1st to 15thDay
30%24%22%15%5%1
120
16th to endDay
32%26%29%10%
128
January1st to 15thNight
26%19%27%22%4
840
16th to endNight
24%19%31%23%2
896
February1st to 15thNight
27%17%28%23%2
824
16th to endNight
24%18%31%23%2
735
March1st to 15thNight
24%16%29%25%3
840
16th to endNight
22%16%29%22%7%
896
April1st to 15thNight
23%17%28%25%4
838
16th to endNight
20%13%23%29%11%
775
May1st to 15thNight
21%7%21%34%15%
620
16th to endNight
13%7%20%36%20%1
439
June1st to 15thNight
12%425%35%21%
408
16th to endNight
11%224%43%18%
390
July1st to 15thNight
10%120%39%25%2
370
16th to endNight
7%213%42%32%2
600
August1st to 15thNight
8%14%43%29%2
575
16th to endNight
13%111%37%31%4
757
September1st to 15thNight
19%413%29%29%3
780
16th to endNight
16%5%16%22%31%6%
777
October1st to 15thNight
21%6%20%29%19%2
780
16th to endNight
22%15%22%29%9%
832
November1st to 15thNight
18%11%24%33%11%
820
16th to endNight
26%17%22%25%7%1
840
December1st to 15thNight
25%14%27%26%6%
840
16th to endNight
25%18%26%28%1
896
Page generated at 2019-06-10 19:29:48. Version ac04

Copyright 2019 A. Danko


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