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 2017-09-21.

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%
15127
17%
46944
11%
15087
45%
15087
21%
30906

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%
717
14%
2416
6%
716
31%
716
11%
1732
January16th to endNight
17%
768
14%
2496
4%
768
29%
768
12%
1785
February1st to 15thNight
18%
704
14%
2287
6%
701
29%
701
13%
1580
February16th to endNight
21%
631
16%
1962
5%
631
34%
631
14%
1378
March1st to 15thNight
25%
720
18%
1980
8%
720
35%
720
18%
1377
March16th to endNight
24%
768
19%
2112
8%
768
33%
768
21%
1397
April1st to 15thNight
26%
718
14%
1799
5%
718
32%
718
20%
1308
April16th to endNight
38%
672
19%
1752
8%
672
43%
672
26%
1175
May1st to 15thNight
42%
531
17%
1611
10%
531
48%
531
22%
1100
May16th to endNight
51%
374
17%
1497
17%
374
57%
374
20%
911
June1st to 15thNight
48%
360
16%
1440
16%
360
56%
360
23%
838
June16th to endNight
56%
360
17%
1440
18%
360
63%
360
27%
790
July1st to 15thNight
54%
340
14%
1360
18%
340
57%
340
22%
806
July16th to endNight
67%
553
17%
1584
14%
520
71%
520
36%
917
August1st to 15thNight
65%
539
18%
1609
13%
536
68%
536
37%
940
August16th to endNight
65%
699
24%
1845
16%
699
66%
699
38%
1116
September1st to 15thNight
55%
720
25%
1800
14%
720
59%
720
34%
1156
September16th to endNight
54%
681
22%
1895
18%
681
57%
681
30%
1207
October1st to 15thNight
45%
660
21%
1980
18%
660
52%
660
26%
1249
October16th to endNight
35%
704
21%
2112
11%
704
48%
704
22%
1372
November1st to 15thNight
41%
700
22%
2239
17%
700
50%
700
25%
1398
November16th to endNight
29%
720
17%
2520
11%
720
40%
720
14%
1681
December1st to 15thNight
25%
720
12%
2520
6%
720
33%
720
12%
1795
December16th to endNight
21%
768
14%
2688
6%
768
32%
768
11%
1898

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%7%36%6%35%5%5%7%33%
47906
Night
14%6%25%5%35%45%8%38%
47126
Cloud CoverDay
14%7%36%6%35%5%5%7%33%
47916
Night
13%6%25%5%3445%7%38%
47130
TransparencyDay
49%411%20%11%1
47606
Night
44%412%23%13%1
46944
SeeingDay
21%11%22%22%15%6%
5555
Night
19%11%23%29%13%1
15131

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%5%10%8%45%45%6%27%
1519
16th to endDay
13%14%6%8%9%35%5%5%5%23%
1728
February1st to 15thDay
14%13%5%8%6%45%446%25%
1575
16th to endDay
12%11%5%11%7%35%445%27%
1509
March1st to 15thDay
16%9%48%6%36%5%45%30%
1969
16th to endDay
16%9%46%5%34347%32%
2112
April1st to 15thDay
15%8%5%5%6%34446%33%
2148
16th to endDay
19%6%36%435%445%37%
2217
May1st to 15thDay
20%6%26%6%35%5%5%6%30%
2337
16th to endDay
16%5%35%5%45%5%5%7%35%
2618
June1st to 15thDay
14%5%25%6%35%5%6%8%36%
2520
16th to endDay
12%425%5%35%5%6%10%35%
2520
July1st to 15thDay
10%6%36%6%47%5%6%8%34%
2520
16th to endDay
9%436%6%46%6%7%9%36%
2474
August1st to 15thDay
11%6%26%6%46%6%8%10%30%
2340
16th to endDay
13%5%245%35%5%7%8%39%
2345
September1st to 15thDay
17%5%245%2445%7%40%
2160
16th to endDay
15%5%25%5%145%6%6%41%
1855
October1st to 15thDay
18%6%26%434446%37%
1650
16th to endDay
15%7%36%6%25%45%6%36%
1760
November1st to 15thDay
10%5%36%445%45%7%41%
1614
16th to endDay
19%8%26%6%35%5%5%5%30%
1440
December1st to 15thDay
16%10%5%10%6%35%45%6%25%
1440
16th to endDay
18%12%49%6%45%45%6%22%
1536
January1st to 15thNight
15%8%48%7%45%45%7%27%
2416
16th to endNight
12%10%38%6%45%5%6%7%28%
2496
February1st to 15thNight
13%9%46%6%36%5%5%8%30%
2285
16th to endNight
11%8%36%7%46%6%6%6%32%
1962
March1st to 15thNight
15%6%35%5%345%5%7%36%
1968
16th to endNight
16%7%244235%47%40%
2112
April1st to 15thNight
15%8%37%5%36%445%35%
1799
16th to endNight
15%5%25%434447%41%
1752
May1st to 15thNight
18%6%145%25%45%8%36%
1611
16th to endNight
13%5%3442446%8%41%
1495
June1st to 15thNight
12%324425%5%5%9%43%
1440
16th to endNight
10%324335%46%10%46%
1440
July1st to 15thNight
8%425%5%2445%8%45%
1440
16th to endNight
6%3246%245%7%10%46%
1691
August1st to 15thNight
7%425%3245%6%11%47%
1620
16th to endNight
11%31332345%8%51%
1845
September1st to 15thNight
14%424424446%48%
1800
16th to endNight
14%5%1443435%6%46%
1895
October1st to 15thNight
17%5%13323448%43%
1980
16th to endNight
17%6%2442445%8%38%
2112
November1st to 15thNight
12%6%25%5%2335%7%44%
2239
16th to endNight
17%7%25%5%35%45%8%33%
2520
December1st to 15thNight
16%8%36%7%36%5%6%7%27%
2520
16th to endNight
16%9%26%7%35%46%8%27%
2688

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
12%9%410%8%36%45%5%27%
1519
16th to endDay
13%15%5%8%7%46%45%423%
1728
February1st to 15thDay
14%13%5%8%6%45%45%6%24%
1575
16th to endDay
12%10%5%11%7%35%446%27%
1509
March1st to 15thDay
16%8%48%5%45%45%5%30%
1980
16th to endDay
16%8%46%5%3435%7%32%
2111
April1st to 15thDay
15%9%46%5%35%446%33%
2148
16th to endDay
19%6%26%434445%37%
2217
May1st to 15thDay
19%7%36%5%35%5%5%6%30%
2337
16th to endDay
16%6%35%5%45%45%6%35%
2618
June1st to 15thDay
13%5%25%5%36%5%6%8%36%
2520
16th to endDay
12%425%6%46%6%6%10%35%
2520
July1st to 15thDay
10%6%36%6%47%6%6%8%35%
2520
16th to endDay
8%5%36%5%46%6%7%9%36%
2474
August1st to 15thDay
10%6%26%6%46%7%8%10%30%
2340
16th to endDay
12%5%16%5%3447%8%38%
2345
September1st to 15thDay
17%5%2443425%7%40%
2160
16th to endDay
15%5%25%5%2445%6%41%
1855
October1st to 15thDay
18%7%25%5%33446%37%
1650
16th to endDay
15%7%36%5%35%45%6%36%
1760
November1st to 15thDay
10%5%35%5%35%45%7%41%
1614
16th to endDay
19%8%36%6%345%5%6%30%
1440
December1st to 15thDay
16%9%6%8%6%46%45%5%26%
1440
16th to endDay
17%12%5%8%6%36%5%47%22%
1536
January1st to 15thNight
15%8%48%7%35%45%7%27%
2416
16th to endNight
12%10%37%6%45%5%6%7%29%
2496
February1st to 15thNight
12%8%5%7%6%36%5%5%8%30%
2278
16th to endNight
11%8%37%7%36%5%7%6%32%
1962
March1st to 15thNight
15%7%35%6%345%6%7%35%
1980
16th to endNight
15%8%25%433446%41%
2112
April1st to 15thNight
15%9%46%5%345%5%5%34%
1799
16th to endNight
15%5%25%434447%41%
1752
May1st to 15thNight
18%5%245%25%5%5%8%36%
1610
16th to endNight
12%7%2442445%9%41%
1495
June1st to 15thNight
11%425%425%5%5%9%42%
1440
16th to endNight
10%31432446%10%46%
1440
July1st to 15thNight
9%426%425%45%9%44%
1440
16th to endNight
6%325%4245%8%11%46%
1691
August1st to 15thNight
6%5%245%25%46%10%47%
1620
16th to endNight
11%41342435%8%51%
1845
September1st to 15thNight
14%424423347%48%
1800
16th to endNight
13%5%15%433447%46%
1895
October1st to 15thNight
16%5%2332345%6%44%
1980
16th to endNight
17%6%2442445%8%39%
2112
November1st to 15thNight
12%7%25%5%33346%45%
2239
16th to endNight
17%7%26%5%25%5%5%7%33%
2520
December1st to 15thNight
16%8%37%6%35%5%5%7%27%
2520
16th to endNight
16%9%37%7%35%5%5%8%27%
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
57%412%17%7%
1520
16th to endDay
63%312%15%5%
1728
February1st to 15thDay
59%313%16%5%
1577
16th to endDay
57%312%17%7%
1509
March1st to 15thDay
55%412%19%7%1
1980
16th to endDay
51%312%22%9%1
2112
April1st to 15thDay
52%49%19%13%1
2148
16th to endDay
48%48%19%16%3
2217
May1st to 15thDay
52%5%10%19%11%1
2337
16th to endDay
47%5%14%18%11%2
2622
June1st to 15thDay
45%6%10%22%14%
2520
16th to endDay
43%5%14%23%12%1
2520
July1st to 15thDay
46%6%9%19%14%2
2371
16th to endDay
40%6%13%22%14%1
2318
August1st to 15thDay
45%6%13%23%10%
2327
16th to endDay
40%6%10%25%14%2
2345
September1st to 15thDay
42%5%9%22%17%2
2160
16th to endDay
42%47%24%17%2
1855
October1st to 15thDay
47%410%23%12%1
1650
16th to endDay
47%313%24%11%
1760
November1st to 15thDay
41%413%21%13%5%
1614
16th to endDay
53%312%21%8%
1440
December1st to 15thDay
59%415%15%5%
1440
16th to endDay
61%311%16%5%
1536
January1st to 15thNight
55%412%17%8%1
2416
16th to endNight
53%414%18%8%
2496
February1st to 15thNight
51%414%20%9%
2287
16th to endNight
51%410%21%11%
1962
March1st to 15thNight
46%5%13%23%10%
1980
16th to endNight
43%314%22%14%1
2112
April1st to 15thNight
50%310%19%14%1
1799
16th to endNight
42%49%23%15%4
1752
May1st to 15thNight
45%6%11%21%14%1
1611
16th to endNight
40%7%13%21%14%2
1497
June1st to 15thNight
37%6%12%29%13%
1440
16th to endNight
32%6%16%26%16%1
1440
July1st to 15thNight
38%6%12%23%14%3
1360
16th to endNight
29%7%17%26%16%2
1584
August1st to 15thNight
31%5%18%26%17%1
1609
16th to endNight
30%5%12%28%18%3
1845
September1st to 15thNight
37%310%25%20%2
1800
16th to endNight
38%49%27%18%2
1895
October1st to 15thNight
40%411%26%15%1
1980
16th to endNight
43%310%29%12%
2112
November1st to 15thNight
40%311%22%15%5%
2239
16th to endNight
49%411%21%11%1
2520
December1st to 15thNight
54%5%13%18%7%
2520
16th to endNight
53%415%19%5%
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
32%28%26%8%41
75
16th to endDay
37%16%35%8%2
96
February1st to 15thDay
33%35%23%7%
90
16th to endDay
27%24%30%16%
159
March1st to 15thDay
25%18%21%28%5%
270
16th to endDay
25%16%28%17%9%3
288
April1st to 15thDay
27%15%21%23%9%2
270
16th to endDay
24%14%20%15%19%5%
270
May1st to 15thDay
34%11%21%15%10%6%
288
16th to endDay
21%12%22%19%13%9%
331
June1st to 15thDay
18%11%23%27%15%3
315
16th to endDay
16%13%24%26%16%3
315
July1st to 15thDay
14%6%30%24%17%7%
305
16th to endDay
9%420%30%22%11%
326
August1st to 15thDay
14%421%22%26%11%
313
16th to endDay
15%116%24%20%20%
332
September1st to 15thDay
20%417%19%23%14%
315
16th to endDay
22%413%23%20%15%
275
October1st to 15thDay
26%6%16%23%20%6%
255
16th to endDay
18%20%25%23%11%
272
November1st to 15thDay
15%10%21%29%20%1
211
16th to endDay
26%18%31%13%8%1
60
December1st to 15thDay
33%25%13%16%8%3
60
16th to endDay
34%18%34%12%
64
January1st to 15thNight
26%19%27%22%4
720
16th to endNight
23%18%32%22%1
768
February1st to 15thNight
25%18%29%23%2
704
16th to endNight
22%19%32%24%2
631
March1st to 15thNight
25%15%29%25%4
720
16th to endNight
22%16%29%21%8%1
768
April1st to 15thNight
23%17%29%24%4
718
16th to endNight
19%11%24%31%12%
672
May1st to 15thNight
20%7%21%34%14%
531
16th to endNight
13%7%19%36%21%2
375
June1st to 15thNight
12%425%36%20%
360
16th to endNight
10%224%43%18%
360
July1st to 15thNight
11%221%41%22%2
340
16th to endNight
6%214%41%32%2
553
August1st to 15thNight
8%15%43%29%2
539
16th to endNight
13%111%37%31%4
699
September1st to 15thNight
17%414%30%28%3
720
16th to endNight
16%5%17%23%31%7%
681
October1st to 15thNight
21%6%21%28%20%2
660
16th to endNight
22%15%23%29%8%
704
November1st to 15thNight
17%11%24%34%11%1
700
16th to endNight
26%17%22%24%7%1
720
December1st to 15thNight
26%15%26%25%5%
720
16th to endNight
24%18%27%27%1
768
Page generated at 2017-09-22 07:35:38. Version ac04

Copyright 2017 A. Danko


Canoe Creek State Park Clear Sky Chart | Charts Home